CN112666595A - Proton beam current measuring device and method - Google Patents
Proton beam current measuring device and method Download PDFInfo
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- CN112666595A CN112666595A CN202110010347.4A CN202110010347A CN112666595A CN 112666595 A CN112666595 A CN 112666595A CN 202110010347 A CN202110010347 A CN 202110010347A CN 112666595 A CN112666595 A CN 112666595A
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Abstract
The utility model provides a measuring device and a method of proton beam, wherein, the measuring device of proton beam comprises a fluorescent screen which is arranged on an electric control platform, the fluorescent screen is vertical to the incident path of proton beam and is used for receiving the irradiation of proton beam and generating fluorescence effect, and the fluorescence effect is used for reflecting the intensity and the uniformity of proton beam. Through the fluorescent screen, the traditional beam detector in the prior art can be replaced, the proton beam can be accurately and rapidly detected directly through fluorescence imaging, the intensity and the uniformity of the beam can be obtained, meanwhile, the size of a beam spot can be judged, the beam measuring time is greatly shortened, and the sample irradiation efficiency is improved.
Description
Technical Field
The disclosure relates to the technical field of proton beam detection, in particular to a device and a method for measuring proton beam current.
Background
In experimental research of proton single event effect and radiation biological effect, the reliability and accuracy of experimental results are determined by the measurement relation of proton beam intensity and uniformity. The proton beam current measuring method in the prior art mainly comprises two modes of on-line measurement and off-line measurement. However, the offline measurement method has poor timeliness, and cannot reflect the beam current state in real time. Therefore, in view of the supervised measurement of beam intensity and uniformity, the on-line measurement is mainly used. The online measurement method mainly comprises a Faraday cylinder, a gas ionization chamber and a scintillator detector, and the measurement principle is to collect and convert beam current to obtain the beam current intensity. However, in the on-line measurement method, the proton beam flow is usually measured by single faraday cylinder multi-point scanning or a detector array, and the scanning step length of the multi-point scanning method is centimeter level, the scanning coverage rate is low, the time consumption is long, and the efficiency is low; the detector array method utilizes a 3 x 3 lattice mode for measurement, but mainly uses point instead of surface, and cannot completely reflect the information of the whole beam section. Therefore, the proton beam measurement methods in the prior art can not quickly and accurately detect or diagnose the uniformity and fluence rate of the beam, and waste precious beam time.
Disclosure of Invention
Technical problem to be solved
In order to solve the problem that the proton beam current cannot be detected quickly and accurately in the prior art, the disclosure provides a device and a method for measuring the proton beam current.
(II) technical scheme
One aspect of the present disclosure provides a proton beam current measuring apparatus, which includes a fluorescent screen disposed on an electronic control platform, the fluorescent screen being perpendicular to an incident path of the proton beam current and configured to receive irradiation of the proton beam current and generate a fluorescence effect, and the fluorescence effect is used to reflect intensity and uniformity of the proton beam current.
According to an embodiment of the present disclosure, the phosphor screen is perpendicular to an incident path of the proton beam.
According to an embodiment of the present disclosure, the apparatus further includes an imaging element disposed on a side of an incident path of the proton beam toward the phosphor screen, for imaging a fluorescence effect to generate a fluorescence image.
According to the embodiment of the disclosure, an included angle theta is formed between a connecting line between the imaging element and the central coordinate of the fluorescent screen and an incident path of the proton beam, wherein theta is less than or equal to 5 degrees.
According to the embodiment of the disclosure, the device further comprises electronic equipment, wherein the electronic equipment is electrically connected with the electronic control platform and the imaging element respectively and is used for controlling the electronic control platform to move so that the fluorescent screen is perpendicular to the incident path, and meanwhile, the electronic equipment is also used for acquiring a fluorescence image generated by the imaging element and analyzing and processing the fluorescence image so as to acquire and display the intensity and uniformity of the proton beam current.
According to the embodiment of the disclosure, the electronic control platform further comprises a fixing frame, wherein the fixing frame is of a frame structure, is perpendicular to the incident path and is used for arranging the fluorescent screen.
According to the embodiment of the disclosure, the fixing frame comprises a plurality of irradiation zones, and a fluorescent screen is arranged in one irradiation zone of the plurality of irradiation zones.
According to the embodiment of the disclosure, one irradiation region provided with the fluorescent screen is also provided with at least one of a plastic scintillator detector and a gold silicon surface barrier detector, the plastic scintillator detector is arranged adjacent to the fluorescent screen, is positioned in the irradiation region where the fluorescent screen is positioned, and is used for measuring the fluence rate of proton beam current; the gold silicon surface barrier detector is arranged adjacent to the fluorescent screen, is positioned in the irradiation area where the fluorescent screen is positioned, and is used for measuring the energy of the proton beam.
According to the embodiment of the disclosure, the electronic control platform further comprises a slider, and the slider is fixedly connected with the fixed frame and used for realizing the movement of the fluorescent screen on the fixed frame in the vertical direction.
According to the embodiment of the disclosure, the electronic control platform further comprises a vertical rail, wherein the vertical rail is in a strip rail structure which is perpendicular to the incident path and parallel to the fixed frame, is in sliding connection with the sliding piece, and is used for enabling the fluorescent screen on the fixed frame to move in the vertical direction along the vertical rail.
According to the embodiment of the disclosure, the electronic control platform further comprises a longitudinal rail, wherein the longitudinal rail is a frame body which is parallel to the incident path and perpendicular to the vertical rail, and is fixedly connected with the vertical rail and used for enabling the fluorescent screen on the fixing frame to move along the longitudinal direction of the longitudinal rail.
According to this disclosed embodiment, vertical rail still includes the support frame, and the support frame sets up with vertical rail vertical laminating to be fixed in vertical rail with vertical rail on.
According to the embodiment of the disclosure, the electronic control platform further comprises a transverse rail, wherein the transverse rail is of a strip rail structure which is perpendicular to the longitudinal rail and the vertical rail and is in sliding connection with the longitudinal rail, and the transverse rail is used for enabling the fluorescent screen on the fixing frame to move in the transverse direction.
According to the embodiment of the disclosure, the electronic control platform further comprises a rotary table, wherein the rotary table is a rotary table structure with a central axis perpendicular to the incident path, is connected with the transverse rail in a sliding manner, and is used for enabling the transverse rail to move in the transverse direction and simultaneously realize the rotary action of the transverse rail by taking the central axis as a rotating shaft.
According to the embodiment of the disclosure, the electric control platform further comprises a base, wherein the base is fixedly connected with the rotary table and fixedly arranged on the plane, and the base is used for fixing the electric control platform on the plane.
According to the embodiment of the disclosure, the electronic control platform is arranged in an irradiation space, and the irradiation space is used for providing a darkroom environment for measurement of proton beam current.
According to the embodiment of the disclosure, the irradiation space comprises an opening, the opening is arranged corresponding to the electric control platform, and the central line of the opening is superposed with the incident path and used for enabling the proton beam to enter the irradiation chamber and irradiate the proton beam onto the fluorescent screen; wherein the imaging element is disposed on an inner edge of the opening.
Another aspect of the present disclosure provides a method for measuring a proton beam current, which is applied to the above apparatus, and includes: responding to the generation of the proton beam, and controlling the electric control platform of the device to move so that a fluorescent screen arranged on the electric control platform is irradiated by the proton beam; imaging a fluorescence effect of the phosphor screen in response to the phosphor screen being irradiated; and acquiring and displaying the intensity and uniformity of the proton beam according to the imaging.
(III) advantageous effects
The utility model provides a measuring device and a method of proton beam, wherein, the measuring device of proton beam comprises a fluorescent screen which is arranged on an electric control platform, the fluorescent screen is vertical to the incident path of proton beam and is used for receiving the irradiation of proton beam and generating fluorescence effect, and the fluorescence effect is used for reflecting the intensity and the uniformity of proton beam. Through the fluorescent screen, the traditional beam detector in the prior art can be replaced, the proton beam can be accurately and rapidly detected directly through fluorescence imaging, the intensity and the uniformity of the beam can be obtained, meanwhile, the size of a beam spot can be judged, the beam measuring time is greatly shortened, and the sample irradiation efficiency is improved.
Drawings
Fig. 1 schematically illustrates a front view of an electronically controlled platform of an embodiment of the present disclosure;
FIG. 2 schematically illustrates a front view of a mount of an embodiment of the present disclosure;
FIG. 3 schematically illustrates a phosphor screen and detector arrangement for an irradiation zone according to an embodiment of the disclosure;
fig. 4 schematically illustrates a structural composition diagram of an imaging element and an electronic control platform according to an embodiment of the disclosure;
FIG. 5 schematically illustrates a fluoroscopic image of an embodiment of the present disclosure;
FIG. 6 schematically illustrates a structural component diagram of an irradiator cell, an imaging element, and an electronically controlled stage according to an embodiment of the disclosure;
fig. 7 schematically illustrates a composition diagram of a measurement apparatus of a proton beam current according to an embodiment of the present disclosure;
fig. 8 schematically illustrates a flow chart of a method of measuring a proton beam current according to an embodiment of the present disclosure;
fig. 9 schematically illustrates a response curve of fluorescence imaging gray scale values of a proton beam current with particle fluence rate according to an embodiment of the disclosure;
fig. 10A schematically illustrates a plot of fluorescence imaging gray scale value of a proton beam current as a function of beam current spot size for an embodiment of the disclosure;
fig. 10B schematically shows a two-dimensional distribution diagram of proton beam current according to an embodiment of the disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the specification and in the claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.
Those skilled in the art will appreciate that the modules in the device of an embodiment may be adaptively changed and placed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
At present, the method of single Faraday cylinder multipoint scanning and the like is long in time consumption and does not use real-time performance, 1 hour is needed for measuring one group of data, the difference time between the first data and the last data of each group of data is long, the change of the beam current in the experimental process cannot be judged, and therefore the accuracy of the data is poor. In order to ensure the accuracy of data, a large amount of beam current time is wasted due to repeated measurement for many times, and the experiment efficiency is reduced.
In order to solve the problem that the proton beam current cannot be detected quickly and accurately in the prior art, the disclosure provides a device and a method for measuring the proton beam current.
As shown in fig. 1-4 and 6, one aspect of the present disclosure provides a proton beam current measuring apparatus, which includes a fluorescent screen 101, wherein the fluorescent screen 101 is disposed on an electronic control platform 100, the fluorescent screen 101 is perpendicular to an incident path E of the proton beam current, and is configured to receive irradiation of the proton beam current and generate a fluorescence effect, and the fluorescence effect is used for reflecting intensity and uniformity of the proton beam current.
Specifically, the measuring device comprises an electronic control platform 100, wherein the electronic control platform 100 is arranged on a plane p and is used for receiving irradiation of proton beam, the electronic control platform 100 comprises a fluorescent screen 101, and the fluorescent screen 101 is arranged on the electronic control platform 100 and is used for generating a fluorescence effect after being irradiated by the proton beam; the fluorescence effect can be used for reflecting the intensity and uniformity of the proton beam.
The fluorescent screen has high energy resolution and luminous efficiency, and is excellent in durability, the emission wavelength peak value of the fluorescent screen needs to be about 545nm of green light, so that the fluorescent screen is better matched with human eyes, and the fluorescent screen is suitable for working environments such as low illumination and even darkroom, so that the fluorescent effect is better, the obtained fluorescent image is clearer, and the reflection on the beam intensity and the uniformity is more real and accurate. In particular, the intensity and uniformity of the beam can be reflected by means of the gray-scale value of the beam spot corresponding to the fluorescence image.
Through the fluorescent screen 101 disclosed by the invention, the traditional beam detector in the prior art can be replaced, the proton beam can be accurately and rapidly detected directly through fluorescence imaging, the intensity and uniformity of the beam can be obtained, meanwhile, the size of a beam spot can be judged, the beam measuring time is greatly reduced, and the sample irradiation efficiency is improved. Therefore, the proton beam current measuring device disclosed by the embodiment of the disclosure can improve the efficiency of an irradiation experiment of the proton beam current, realize the measurement and visualization of the beam current fluence rate and the uniformity in a short time, and enable the measurement process to be more intuitive and accurate.
As shown in fig. 4 and 6, according to an embodiment of the present disclosure, the phosphor screen 101 is perpendicular to the incident path E of the proton beam. The incident path E is an incident direction of the proton beam and has energy E. Therefore, the beam can be vertically irradiated onto the fluorescent screen 101, so that the fluorescent effect generated by the beam irradiation on the fluorescent screen 101 is more real, and the beam intensity and uniformity data reflected by the corresponding fluorescent image are more accurate.
As shown in fig. 1, 2, 4 and 6, according to the embodiment of the present disclosure, the electronic control platform 100 further includes a fixing frame 110, and the fixing frame 110 is a frame structure and is disposed perpendicular to the incident path E for disposing the fluorescent screen 101. The fixing frame 110 is disposed on the electronic control platform 100, and may be a metal frame for supporting the fluorescent screen 101 and providing a sample setting position for sample irradiation of the proton beam. In addition, the fixed mount 110 can realize up-and-down movement, left-and-right movement and rotation movement in the direction perpendicular to the incident path E under the control of the electronic control platform 100, so that the fixed mount 110 can drive the fluorescent screen 101 to move together, and finally the light-facing surface of the fluorescent screen 101 needs to be vertically irradiated by proton beams.
As shown in fig. 1-3, according to the embodiment of the disclosure, the fixing frame 110 includes a plurality of irradiation regions 111 and 114, and one irradiation region of the plurality of irradiation regions 111 and 114 is provided with the phosphor screen 101. Each irradiation region is a region of a light facing surface formed by a plate-shaped structure forming the fixed frame 110, and the plate-shaped structure is made of a material and has a thickness capable of blocking proton beam flow from further transmitting through the structure of the fixed frame 110. A plurality of setting positions are distributed on a light facing surface of each irradiation region, and each setting position is used for setting a sample or a fluorescent screen 101 and the like.
The phosphor screen 101 may be disposed in any one of the plurality of irradiation regions 111-114, as shown in fig. 1-3, the phosphor screen 101 may be disposed in the irradiation region 111, and thus, the other irradiation regions 112-114 may be used to dispose the sample to be irradiated. Compared with the prior art in which five detectors are adopted to measure the proton beam current, the fixed frame 110 can be used for placing more samples, so that the samples do not need to be frequently replaced, and the experimental efficiency of sample irradiation can be further improved.
It should be noted that, the sample is a sample to be irradiated, and the measuring apparatus for a proton beam current of the present disclosure is actually used to determine whether the proton beam current used for irradiating the sample meets the irradiation conditions of the corresponding sample, such as beam current intensity and uniformity, before irradiating the sample with the proton beam current.
As shown in fig. 3, one irradiation region 111 where the phosphor screen 101 is disposed is further provided with at least one of a plastic scintillator detector 102 and a gold silicon surface barrier detector 103 according to an embodiment of the present disclosure. Specifically, the electronic control platform 110 may further include a plastic scintillator detector 102 and a gold silicon surface barrier detector 103, where the plastic scintillator detector 102 is disposed adjacent to the fluorescent screen 101, located in an irradiation region where the fluorescent screen 101 is located, and configured to measure a fluence rate of a proton beam; the gold silicon surface barrier detector 103 is arranged adjacent to the fluorescent screen 101, is located in an irradiation area where the fluorescent screen 101 is located, and is used for measuring the energy of the proton beam. When the fluorescent screen 101 is arranged in the irradiation region 111, the plastic scintillator detector 102 and the gold silicon surface barrier detector 103 may be simultaneously adjacent to the fluorescent screen 101 and arranged in the same irradiation region 111, and the measurement of the fluence rate and the energy of the proton beam may be realized by the plastic scintillator detector 102 and the gold silicon surface barrier detector 103, so that the measurement of the beam intensity and the uniformity obtained by the fluorescence image is more accurate according to the measurement values of the fluence rate and the energy. Meanwhile, the plastic scintillator detector 102, the gold silicon surface barrier detector 103 and the fluorescent screen 101 are arranged in the same irradiation region 111, so that the two detectors can be prevented from occupying other irradiation regions 112 and 114, the sample arrangement is more, and the experiment efficiency is improved.
In addition, as shown in fig. 3, in the irradiation region 111, the phosphor screen 101 may be disposed in the middle of the irradiation region 111, or may be disposed at a position close to the right lower edge of the irradiation region 111, and accordingly, the two detectors may also be correspondingly disposed at adjacent positions of the phosphor screen 101, so that the irradiation region 111 may generate a sub-region 111a as a spare setting region, the sub-region 111a may further be used to set a greater number of samples to be irradiated, and after the proton beam current is determined, a greater number of samples may be placed, thereby further improving experimental efficiency.
As shown in fig. 4 and 6, according to the embodiment of the present disclosure, the apparatus further includes an imaging element 200, the imaging element 200 being disposed on one side of the incident path E of the proton beam current toward the phosphor screen 101, for imaging the fluorescence effect to generate a fluorescence image.
The imaging element may be a CCD camera that captures images at high speed, and may be, for example, at least 530 ten thousand pixels, a global shutter, a 1 inch octahedral gigabit industrial CCD camera. Specifically, the CCD camera can have the external dimension of 29mm × 29mm × 42mm, is powered by the network cable POE, has the advantages of strong anti-interference performance and support for third-party software development, and simultaneously adopts a gigabit Ethernet interface and 100 m 1Gbps long-distance stable transmission, so that the 100 m long-distance stable transmission frame rate under 530 ten thousand pixels is up to 20 frames/second, and is downward compatible with a hundred million network data interface. The fluorescent screen 101 is irradiated by the proton beam to generate a fluorescence effect, and the fluorescence effect is captured and imaged by the imaging element 200 to obtain a fluorescence image as shown in fig. 5. And finally, analyzing the gray value of the fluorescence image through a correspondingly developed software algorithm to obtain the corresponding beam intensity and uniformity.
As shown in fig. 4, 5 and 6, according to the embodiment of the present disclosure, a connecting line s1 between the imaging element 200 and the center coordinates of the phosphor screen 101 has an angle θ with the incident path E of the proton beam (i.e., line s2), where θ ≦ 5 °.
When the center of the phosphor screen 101 is vertically irradiated by the proton beam, it is satisfied that the light facing surface of the phosphor screen 101 is perpendicular to the beam incident path E (i.e., the line s2), and at this time, an included angle of 5 ° or less is formed between the direction (i.e., the line s1) of the imaging element 200 toward the center coordinate of the phosphor screen 101 and the incident path E, so as to ensure that the obtained fluorescence image more conforms to the fluorescence image in an ideal state under the condition that the imaging element 200 does not interfere or affect the proton beam incident, and to ensure that the obtained corresponding data of the proton beam is more accurate. Specifically, as shown in fig. 5, ideally, the imaging element 200 should image perpendicular to the center of the phosphor screen 101, and the acquired fluorescence image should be the image x 101. However, in order to prevent the imaging element 200 from interfering with or affecting the proton beam incident, the imaging element 200 is disposed on the incident path 200 side and is offset from the incident path by a certain distance to form an angle θ, and thus, this results in that the actually acquired fluorescence image is the image s 101. Therefore, a corresponding software algorithm needs to be designed according to the acquired image s101, and the image is corrected as much as possible, so that the corresponding beam data of the image s101 is consistent with the data of the image x101 in an ideal state, and the data accuracy is ensured.
Therefore, by the measuring device of the embodiment of the disclosure, the uniformity and the beam spot size of the beam can be obtained and displayed in real time through self-research software on a computer, so that the data accuracy caused by the beam intensity change in the experimental process is improved, meanwhile, repeated and invalid measurement is reduced, namely, the beam intensity, the uniformity and the like are obtained quickly, visually and immediately in the sample irradiation experimental process, a method for calibrating the beam intensity fluorescence detection is established, and the experimental efficiency is improved. Specifically, according to the measuring device of the fluorescent screen + the imaging element of the embodiment, the measurement diagnosis time of the proton beam can be greatly reduced from 1 hour to 3-5 minutes, and the experimental efficiency is greatly improved.
As shown in fig. 1, 4, and 6, according to the embodiment of the present disclosure, the electronic control platform 100 further includes a slider 120, and the slider 120 is fixedly connected to the fixed frame 110 and slidably disposed on the electronic control platform 100, so as to implement the vertical movement of the fixed frame 110 on the electronic control platform 100, and thus implement the vertical movement of the fluorescent screen 101 on the fixed frame.
As shown in fig. 1, 4 and 6, according to the embodiment of the present disclosure, the electronic control platform 100 further includes a vertical rail 130, and the vertical rail 130 is a bar-shaped rail structure perpendicular to the plane p or the incident path E and parallel to the fixing frame 110, and is slidably connected to the slider 120, so that the fluorescent screen 101 on the fixing frame 110 moves in a vertical direction along the vertical rail 130. The slider 120 is a sliding frame structure, and can slide up and down along the vertical rail 130 in a limited sliding relationship with the vertical rail 130. Specifically, the vertical rail 130 may have a vertical rail groove on the surface thereof, and the slider 120 may have a limiting protrusion matching with the rail groove, the limiting protrusion being limited by the opening of the rail groove, and the limiting protrusion moving up and down along the rail groove. Wherein the incident path E and the plane p are parallel to each other.
As shown in fig. 1, 4 and 6, according to the embodiment of the present disclosure, the electronic control platform 100 further includes a longitudinal rail 140, where the longitudinal rail 140 is a frame body parallel to the incident path E and perpendicular to the vertical rail 130, and is fixedly connected to the vertical rail 130, so as to enable the vertical rail 130 to move along the longitudinal direction of the longitudinal rail 140, thereby enabling the fluorescent screen 101 on the fixing frame 110 to move along the longitudinal direction of the longitudinal rail.
According to the embodiment of the present disclosure, the longitudinal rail 140 further includes a supporting frame 141, the supporting frame 141 is vertically attached to the vertical rail 130, and the vertical rail 130 is fixed on the longitudinal rail 140. The support frame also plays a role in supporting the vertical rail 130, providing a setting position for the vertical rail 130, and meanwhile, preventing the vertical rail 130 from sliding up and down on the slider 120 or preventing the longitudinal rail 140 from shaking in the moving process in the longitudinal direction, so that the whole framework of the electric control platform 100 is more stable.
According to the embodiment of the present disclosure, the electronic control platform 100 further includes a transverse rail 150, and the transverse rail 150 is a strip rail structure vertically disposed on both the longitudinal rail 140 and the vertical rail 130, and is slidably connected to the longitudinal rail 140, so that the longitudinal rail 140 can move in the transverse direction, and thus the fluorescent screen 101 on the fixing frame 110 can move in the transverse direction. Longitudinal rail 140 has a sliding limit relationship with transverse rail 150. The longitudinal rail 140 can move along the transverse rail 150 in the transverse direction, thereby moving the electronic control platform 100 in the transverse direction.
According to the embodiment of the present disclosure, the electric control platform 100 further includes a turntable 160, the turntable 160 is a rotary table structure having a central axis perpendicular to the plane p or the incident path E, and is slidably connected to the transverse rail 150, so that the transverse rail 150 performs a transverse movement while the transverse rail 150 performs a rotation motion about the central axis s 3. Therefore, the electronic control platform 100 can freely rotate on the plane p, so that the position adjustment range of the fluorescent screen 101 of the electronic control platform 100 is larger.
As shown in fig. 1, 4, and 6, according to the embodiment of the present disclosure, the electronic control platform 100 further includes a base 170, and the base 170 is fixedly connected to the turntable 160 and is fixedly disposed on the plane p for fixing the electronic control platform 100 on the plane p. The base 170 is a base body parallel to the turntable 160, the upper and lower planes of the longitudinal rail 140 and the transverse rail 150, and the plane p, and is used for supporting and fixing the electronic control platform 100, so as to enhance the overall stability of the electronic control platform 100.
As shown in fig. 6, according to the embodiment of the present disclosure, the electronic control platform 100 is disposed in an irradiation space, and the irradiation space is used for providing a darkroom environment for measurement of proton beam current. The irradiation space is surrounded by the irradiation chamber 300, and the irradiation space accommodates the electronic control platform 100 and is used for providing a darkroom environment for measurement of proton beam current. Wherein the irradiation chamber comprises a housing structure, a box structure or a room structure, and the bottom surface of the housing structure can be taken as the plane p, as shown in fig. 1, 4 and 6.
According to the embodiment of the disclosure, the irradiation space includes an opening 301 which is a through opening of the shell structure of the irradiation chamber 300, the opening 301 is arranged corresponding to the electronic control platform 100, and the center line of the opening 301 coincides with the incident path E, so that the proton beam enters the irradiation chamber 300 and irradiates on the fluorescent screen 101; wherein the imaging element 200 is disposed on an inner edge of the opening 301. The opening 301 may also be provided with beam limiting diaphragms along the inner edge for controlling the size and shape of beam spots of beams entering the irradiation space and irradiated onto the electric control platform.
As shown in fig. 7, according to the embodiment of the present disclosure, the apparatus further includes an electronic device 20, where the electronic device 20 is electrically connected to the electronic control platform 100 and the imaging element 200, respectively, and is configured to control the electronic control platform 100 to move, so that the fluorescent screen 101 is perpendicular to the incident path E, that is, the fluorescent screen 101 disposed on the electronic control platform 100 is vertically irradiated by the proton beam; meanwhile, the electronic device 20 is further configured to acquire a fluorescence image generated by the imaging element 200, and analyze and process the fluorescence image to obtain and display the intensity and uniformity of the proton beam.
According to the embodiment of the present disclosure, the proton beam current measuring apparatus further includes an accelerator, and a pipe 31 of the accelerator is butted with an opening 301 of an irradiation chamber 300 of the proton beam current measuring apparatus, so that the proton beam current generated by the accelerator passes through the pipe 31 and enters the irradiation chamber 300 through the opening 301 to perform vertical proton irradiation on a fluorescent screen 101 disposed on the electronic control platform 100. The accelerator may be a tandem accelerator providing proton beam current, e.g. 22MeV, for measurement or irradiation, wherein the beam intensity is irradiated from weak to strong.
The electronic device 20 may be a computer or other terminal device with data processing and storage functions, and may be separately installed in a control hall isolated from a measurement hall where the measurement device is located, and the measurement device is correspondingly controlled by manually inputting parameters, so as to measure the proton beam current and irradiate the sample. Specifically, the electronic device 20 may be electrically connected to the imaging element 200 and the electronic control platform 100 through a long-distance network cable, and the imaging parameters of the imaging element are set to ensure that the imaging parameters remain unchanged during the irradiation process and the image acquisition process.
As shown in fig. 8, another aspect of the present disclosure provides a method for measuring a proton beam current, which is applied to the above apparatus, and includes steps S801 to S803.
In step S801, in response to generation of a proton beam, an electrically controlled stage of a control device moves so that a phosphor screen provided on the electrically controlled stage is irradiated with the proton beam;
in step S802, a fluorescence effect of the phosphor screen is imaged in response to the phosphor screen being irradiated;
in step S803, the intensity and uniformity of the proton beam current are acquired and displayed according to the imaging.
After the fluorescence image is collected by the imaging element, the gray level of a green light channel of the image is analyzed by software, and a relation curve of the gray level and the beam intensity and a two-dimensional distribution result of the gray level can be obtained so as to reflect the intensity and the uniformity of the proton beam. Accordingly, according to the above description of the measurement apparatus, a person skilled in the art should obtain a specific detection process of the measurement method in the embodiment of the present disclosure, and details are not described herein.
When the above-described measurement method is performed for a 22MeV proton beam current supplied from a tandem accelerator according to the above-described measurement apparatus, as shown in fig. 9-10B, a response linearity of the 22MeV proton beam current at different intensities can be obtained, as shown in fig. 9, thereby reflecting the intensity of the proton beam current. Further, as shown in fig. 10A and 10B, a two-dimensional distribution diagram for reflecting the uniformity of the 22MeV proton beam current can be obtained, in which the distance 1 is 6.1cm and the distance 2 is 6.2cm as shown in fig. 10B. Therefore, the measuring device based on the embodiment of the disclosure lays a good foundation for simultaneously measuring the intensity and uniformity of the proton beam, provides more convenient and efficient beam quality diagnosis and dose measuring means and methods for single particle and biological effect experiments, greatly shortens the time for beam diagnosis, measurement and analysis, and improves the working efficiency; meanwhile, visualization and basic quantification of online real-time detection of the proton beam current can be broken through, image acquisition software is designed autonomously, and integration of image acquisition, transmission and preservation is achieved preliminarily.
So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings.
It should be noted that, unless a technical obstacle or conflict exists, the above-mentioned various embodiments of the present disclosure may be freely combined to form further embodiments, which are all within the scope of protection of the present disclosure.
While the present disclosure has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of the preferred embodiments of the disclosure, and should not be construed as limiting the disclosure. The dimensional proportions in the drawings are merely schematic and are not to be understood as limiting the disclosure.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (17)
1. A proton beam current measuring apparatus, comprising:
and the fluorescent screen is arranged on an electric control platform, is perpendicular to the incident path of the proton beam, and is used for receiving the irradiation of the proton beam and generating a fluorescence effect which is used for reflecting the intensity and the uniformity of the proton beam.
2. The apparatus of claim 1, further comprising:
and the imaging element is arranged on one side of the incident path of the proton beam towards the fluorescent screen and is used for imaging the fluorescence effect to generate a fluorescence image.
3. The apparatus of claim 2, wherein a connecting line between the imaging element and the center coordinates of the phosphor screen forms an angle θ with an incident path of the proton beam, wherein θ is less than or equal to 5 °.
4. The apparatus of claim 2, further comprising:
and the electronic equipment is electrically connected with the electronic control platform and the imaging element respectively, is used for controlling the electronic control platform to move so as to ensure that the fluorescent screen is vertical to the incident path, is also used for acquiring a fluorescence image generated by the imaging element and analyzing and processing the fluorescence image so as to obtain and display the intensity and the uniformity of the proton beam.
5. The apparatus of claim 1, wherein the electronically controlled platform comprises:
the fixing frame is of a frame structure, is arranged perpendicular to the incident path and is used for arranging the fluorescent screen.
6. The apparatus of claim 5, wherein the fixture comprises:
a plurality of irradiation zones, one of the plurality of irradiation zones providing the phosphor screen.
7. The apparatus of claim 6, wherein said one irradiation zone provided with a phosphor screen is further provided with a plastic scintillator detector wherein:
and the plastic scintillator detector is arranged adjacent to the fluorescent screen and is used for measuring the fluence rate of the proton beam current.
8. The apparatus of claim 5, wherein the electronically controlled platform further comprises:
and the sliding piece is fixedly connected with the fixed frame and is used for realizing the movement of the fluorescent screen on the fixed frame in the vertical direction.
9. The apparatus of claim 8, wherein the electronically controlled platform further comprises:
and the vertical rail is in a strip rail structure which is perpendicular to the incident path and parallel to the fixed frame, is in sliding connection with the sliding piece and is used for enabling the fluorescent screen on the fixed frame to move in the vertical direction along the vertical rail.
10. The apparatus of claim 9, wherein the electronically controlled platform further comprises:
and the longitudinal rail is a frame body which is parallel to the incident path and is vertical to the vertical rail, is fixedly connected with the vertical rail and is used for enabling the fluorescent screen on the fixed frame to move in the longitudinal direction along the longitudinal rail.
11. The device of claim 10, wherein the longitudinal rail further comprises:
the support frame, the support frame with vertical rail is perpendicular to be laminated and is set up, and will vertical rail is fixed in on the longitudinal rail.
12. The apparatus of claim 10, wherein the electronically controlled platform further comprises:
and the transverse rail is a strip rail structure which is perpendicular to the longitudinal rail and the vertical rail, is in sliding connection with the longitudinal rail and is used for enabling the fluorescent screen on the fixing frame to move along the transverse direction.
13. The apparatus of claim 12, wherein the electronically controlled platform further comprises:
the rotary table is a rotary table structure with a central axis perpendicular to the incident path, is connected with the transverse rail in a sliding manner, and is used for enabling the transverse rail to move in the transverse direction and simultaneously realizing the rotary action of the transverse rail by taking the central axis as a rotating shaft.
14. The apparatus of claim 13, wherein the electronically controlled platform further comprises:
and the base is fixedly connected with the rotary table, is fixedly arranged on a plane and is used for fixing the electric control platform on the plane.
15. The device of claim 2, wherein the electronic control platform is disposed in an irradiation space, and the irradiation space is used for providing a darkroom environment for measurement of proton beam current.
16. The apparatus of claim 15, wherein the irradiation space comprises:
the opening is arranged corresponding to the electronic control platform, the central line of the opening is superposed with the incident path, and the opening is used for enabling the proton beam to enter the irradiation chamber and irradiate the proton beam onto the fluorescent screen;
wherein the imaging element is disposed on an inner edge of the opening.
17. A method for measuring a proton beam current, applied to the apparatus for measuring a proton beam current according to any one of claims 1 to 16, comprising:
in response to the generation of the proton beam, controlling an electric control platform of a measuring device of the proton beam to move so that a fluorescent screen arranged on the electric control platform is irradiated by the proton beam;
imaging a fluorescence effect of the phosphor screen in response to the phosphor screen being irradiated;
and acquiring and displaying the intensity and uniformity of the proton beam according to the imaging.
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