CN113156485A - Detector for weak particle beam on-line monitoring - Google Patents
Detector for weak particle beam on-line monitoring Download PDFInfo
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- CN113156485A CN113156485A CN202110433605.XA CN202110433605A CN113156485A CN 113156485 A CN113156485 A CN 113156485A CN 202110433605 A CN202110433605 A CN 202110433605A CN 113156485 A CN113156485 A CN 113156485A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
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Abstract
The invention relates to a detector for weak particle beam online monitoring, comprising: the ellipsoidal reflector is internally provided with an ellipsoidal surface, and two through holes are respectively formed in two sides of the ellipsoidal reflector; the scintillation film frame is fixed on the ellipsoid; the scintillation film is fixed on the scintillation film frame; the observation window flange is connected to the opening end of the ellipsoidal reflector, an observation hole is formed in the middle of the observation window flange, and a transparent part is arranged in the observation hole; the front end of the photomultiplier extends into the observation hole and is tightly contacted with the transparent piece; the first flange is connected with the observation window flange in a sealing way; the supporting and shielding assembly is connected with the first flange into a whole and is sleeved outside the photomultiplier integrally; the corrugated pipe assembly is sleeved outside the supporting and shielding assembly, and the rear end of the corrugated pipe assembly is fixed with the rear end of the supporting and shielding assembly; and the driving mechanism is used for driving the corrugated pipe assembly to stretch along the length direction of the corrugated pipe assembly, so that the online and offline functions of the detector can be realized. The invention can record the beam intensity particle by particle to realize the real-time online monitoring of the ion beam.
Description
Technical Field
The invention relates to the technical field of accelerator beam diagnosis, in particular to a detector for on-line monitoring of weak particle beams.
Background
In the accelerator, a beam diagnosis system is a key component of the accelerator, and beam diagnosis is the eye of the accelerator, so that main means and basis are provided for beam debugging, key parameter optimization and running state monitoring of the accelerator. How to accurately obtain information such as beam current intensity, beam position, beam cross section and the like is always an important subject of accelerator beam diagnosis, and with continuous and deep experimental research, the requirements on beams are more strict, such as single event effect tests, microbeam irradiation tests and the like, and the irradiation tests are required on smaller and weaker beams, which also puts higher requirements on a beam diagnosis system.
The beam intensity and fluence rate are one of the most important parameters for single event effect experiments. In the radiation damage research of aerospace chips, it is important to accurately monitor the number of particles in the experiment to give an exact result. In particular, in the study of materials using microbeams, it is necessary to precisely record the number of irradiated particles without substantially affecting the properties of the particle beam. The experiment needs to use a detector which can record the beam intensity particle by particle, has the efficiency close to 100 percent and has the thickness of micron order, is used for the online real-time monitoring of weak ion beams, and at present, no detector for the online monitoring of the weak particle beams exists in the market.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a detector for weak particle beam online monitoring, which can record beam intensity particle by particle to realize real-time online monitoring of an ion beam.
In order to achieve the purpose, the invention adopts the following technical scheme:
the detector for weak particle beam online monitoring comprises: the ellipsoidal reflector is a shell structure with an opening at one end, an ellipsoidal surface which is subjected to polishing treatment is arranged inside the shell structure, two through holes for beam passing are respectively formed in two sides of the ellipsoidal reflector along the beam incident direction and the beam emergent direction, and an incident hole and an emergent hole are respectively formed in the two through holes; the scintillation film frame is fixed on the ellipsoidal surface inside the ellipsoidal reflecting piece; the scintillation film is fixedly arranged on the scintillation film frame and is positioned in the center of the through hole on the ellipsoidal reflector; the observation window flange is connected to the opening end of the ellipsoidal reflector to seal the ellipsoidal reflector, an observation hole is formed in the middle of the observation window flange, and a transparent part is arranged in the observation hole; the front end of the photomultiplier extends into the observation hole of the observation window flange and is tightly contacted with the transparent piece; the first flange is connected with the observation window flange in a sealing way; the supporting and shielding assembly is connected with the first flange into a whole and is integrally sleeved outside the photomultiplier; the corrugated pipe assembly is sleeved outside the supporting and shielding assembly, and the rear end of the corrugated pipe assembly is fixed with the rear end of the supporting and shielding assembly; and the driving mechanism is used for driving the corrugated pipe assembly to stretch and contract along the length direction of the corrugated pipe assembly.
The detector preferably further comprises a light shielding pipe, wherein the light shielding pipe is sleeved outside the photomultiplier and is positioned inside the supporting and shielding assembly; the observation window flange is provided with a groove sealed by rubber, the front end of the light avoiding tube is hermetically connected with the observation window flange, and the light avoiding tube is tightly matched with the photomultiplier.
The detector, preferably, still include the second flange, the second flange cover is established outside supporting the shielding subassembly, and the front end with supporting the shielding subassembly and connecting through the slip uide bushing and supporting, the rear end with the front end of bellows subassembly is connected.
The detector, preferably, one side of the scintillation membrane frame close to the photomultiplier is a notched semicircular structure.
The detector, preferably, the scintillation membrane is circular structure, and the diameter is greater than the size of beam spot, the thickness of scintillation membrane is 0.5 um-20 um.
The detector, preferably, the scintillation film is located at an ellipsoidal geometric focus of the ellipsoid within the ellipsoidal reflector.
The detector, preferably, the photomultiplier with the transparent piece rear end the binding surface central point is located in the ellipsoid reflecting piece the ellipsoid surface another ellipsoid geometry focus.
The detector is characterized in that the driving mechanism preferably comprises a base, a slider seat, a lead screw, a guide rail and a driving motor, the upper end of the slider seat is connected with the corrugated pipe assembly, and two sliders are respectively arranged on two sides of the lower end of the slider seat; the lead screw is arranged above the base and is connected with the base; the lead screw is in threaded connection with the sliding block seat; the two guide rails are respectively arranged on the base and positioned on two sides of the screw rod; the sliding block can slide on the guide rail along the length direction of the guide rail; the driving motor is connected with the lead screw and used for driving the lead screw to rotate so as to enable the sliding block seat to move on the lead screw along the length direction of the lead screw in a threaded mode.
The detector, preferably, the driving mechanism further includes a mechanical limiting member, a photoelectric limiting member and a displacement sensor; the mechanical limiting parts and the photoelectric limiting parts are sequentially arranged on the base at intervals along the length direction of one of the guide rails from back to front and are used for positioning and limiting the sliding block; and a sliding pull rod in the displacement sensor is connected with the sliding block seat through a connecting rod and used for acquiring displacement information of the sliding block.
The detector, preferably, actuating mechanism still includes the signal connector fixed plate, the signal connector fixed plate set up in on the base for installation fixed signal and spacing joint.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the detector for weak particle beam on-line monitoring provided by the invention adopts a mode that the scintillation film emits light and is collected by the photomultiplier through reflection, the loss of the scintillation film with the micron-sized thickness to the beam can be almost ignored, the influence on the beam is effectively reduced, the beam intensity can be recorded particle by particle, the efficiency is close to 100%, and the change of the beam intensity can be monitored on line in real time.
2. According to the detector for weak particle beam online monitoring, the driving mechanism is used for driving the vacuum corrugated pipe sealing mechanism to contract and stretch, the supporting shielding pipe assembly is driven to do linear motion in the vacuum cavity, the ellipsoid reflecting piece and the scintillation film are further driven to move in the vacuum cavity, and the ellipsoid reflecting piece scintillation film probe is driven to move to or leave the beam central position, so that the online measurement and offline functions of the detector are realized, the detector is more flexible and changeable, special disassembly is not needed when the detector is not needed, and the operation efficiency of an accelerator is greatly improved.
In conclusion, the detector for weak particle beam online monitoring provided by the invention can monitor the beam current intensity in real time, realizes online and offline functions under the condition of not damaging a vacuum environment, has the characteristics of simple structure, convenience in use, high reliability, high measurement precision and low cost, and can provide reliable service for the operation and debugging of an accelerator.
Drawings
FIG. 1 is a schematic cross-sectional view of a detector for weak particle beam online monitoring according to an embodiment of the present invention;
FIG. 2 is a schematic front view of a detector for weak particle beam online monitoring according to an embodiment of the present invention;
FIG. 3 is a schematic top view of a detector for weak particle beam online monitoring according to an embodiment of the present invention;
FIG. 4 is a perspective view of a detector removal driving mechanism for weak particle beam on-line monitoring according to an embodiment of the present invention;
FIG. 5 is a perspective view of the bellows assembly of FIG. 4;
FIG. 6 is a cross-sectional view of FIG. 4;
FIG. 7 is an enlarged partial cross-sectional view of one direction of the front ellipsoidal reflector of FIG. 6;
figure 8 is an enlarged partial cross-sectional view in another direction of the front ellipsoidal reflector of figure 6.
The figures are numbered:
1-an ellipsoidal reflector; 101-a through hole; 2-a scintillation film frame; 3-a scintillation film; 4-an observation window flange; 401-quartz glass; 5-a photomultiplier tube; 6-a first flange; 7-supporting the shielding assembly; 8-a bellows assembly; 9-a drive mechanism; 901-a base; 902-slider mount; 903-a lead screw; 904-guide rail; 905-a drive motor; 906-a slider; 907 — mechanical limiter; 908-an electro-optic stop; 909-displacement sensor; 910-signal connector fixing plate; 10-light avoiding tube; 11-second flange.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1, fig. 4, fig. 5, fig. 6, fig. 7 and fig. 8, the present invention provides a detector for weak particle beam online monitoring, which includes: the ellipsoidal reflector 1 is a shell structure with an opening at one end, an ellipsoidal surface which is subjected to polishing treatment is arranged inside the shell structure, two through holes 101 for allowing beams to pass through are respectively formed in two sides of the ellipsoidal reflector 1 along the beam incident direction and the beam emergent direction, and an incident hole and an emergent hole are respectively formed in the two through holes 101; the scintillation film frame 2 is fixed on an ellipsoid surface inside the ellipsoid reflecting piece 1; the scintillation film 3 is fixedly arranged on the scintillation film frame 2, and the scintillation film 3 is positioned at the center of the through hole 101 on the ellipsoidal reflector 1, namely the scintillation film 3 is intersected with the central line of the through hole 101; the observation window flange 4 is connected to the opening end of the ellipsoidal reflector 1 to seal the ellipsoidal reflector, an observation hole is formed in the middle of the observation window flange 4, a transparent piece is arranged in the observation hole, and the transparent piece is quartz glass 401 with good light transmittance; the front end of the photomultiplier 5 extends into an observation hole of the observation window flange 4 and is tightly contacted with the quartz glass 401 through silica gel; the first flange 6 is a loose flange, so that the installation direction of an incident hole of the ellipsoidal reflector 1 can be conveniently adjusted, and the first flange 6 is hermetically connected with the observation window flange 4 through a copper ring; the supporting and shielding assembly 7 is connected with the first flange 6 into a whole and is sleeved outside the photomultiplier 5 as a whole; the corrugated pipe assembly 8 is sleeved outside the supporting and shielding assembly 7, and the rear end of the corrugated pipe assembly is fixed with the rear end of the supporting and shielding assembly 7; and the driving mechanism 9 is used for driving the bellows assembly 8 to extend and contract along the length direction of the bellows assembly 8.
When the device is used, the driving mechanism 9 drives the corrugated pipe assembly 8 to do compression and extension motions, the supporting and shielding assembly 7 moves back and forth along with the corrugated pipe assembly, and then the ellipsoidal reflector 1 and the scintillation film frame 2 are driven to do linear motion together, so that the ellipsoidal reflector 1 is in an online state or an offline state. When the ion source is in an on-line state, the scintillation film 3 on the scintillation film frame 2 moves to a specified beam central position, when a beam passes through the scintillation film 3, the scintillation film 3 emits light under the action of the beam, the light is reflected by the ellipsoid and then is collected by the photomultiplier 5 after penetrating through the quartz glass 401, and signals of the photomultiplier 5 are converted into pulse signals after being screened by front-end electronics and then are recorded by a counter to obtain beam intensity information, so that the intensity of a weak ion beam is monitored in real time. The invention can realize the monitoring of c particles of 1Mev, and the flow intensity range is less than 106pps; the thickness of the scintillation film is from 0.5um to about 20um, and the loss of beam current is hardly caused. Physical personnel can measure and debug the quality parameters of weak particle beams of the accelerator conveniently, the device can monitor the beam current intensity on line in real time, and the device can return to an off-line position under the condition of not damaging a vacuum environment; the device can greatly improve the working efficiency and reduce the running cost of the accelerator.
In the above embodiment, preferably, the detector further includes a light shielding tube 10, the light shielding tube 10 is sleeved outside the photomultiplier 5 and is located inside the supporting and shielding assembly 7; the rubber sealing groove is formed in the observation window flange 4, the front end of the light-resistant tube 10 is connected with the observation window flange 4 in a sealing mode, the light-resistant tube 10 is tightly matched with the photomultiplier tube 5, a black light-resistant material can be wound at the tail of the light-resistant tube and the combination position of the photomultiplier tube, the photomultiplier tube and the light-resistant tube are fixed into a whole, and installation fixing and light-resistant processing of the photomultiplier tube are achieved.
In the above embodiment, preferably, the detector provided by the present invention further includes a second flange 11, the second flange 11 is sleeved outside the supporting and shielding assembly 7, the front end of the second flange is connected to the supporting and shielding assembly 7 through a sliding guide sleeve, and the rear end of the second flange is connected to the front end of the bellows assembly 8; the second flange 11 is used to mount the entire probe to the vacuum line of the accelerator.
In the above embodiment, preferably, one side of the scintillation film frame 2 close to the photomultiplier tube 5 is a notched semicircular structure, and the scintillation film frame 2 has a thickness as thin as possible, so as to reduce the influence on the transmission and reflection of light emitted by the scintillation film 3 in the ellipsoidal reflector 1, thereby ensuring the collection of photoelectrons by the photomultiplier tube 5.
In the above embodiment, preferably, the scintillation film 3 has a circular structure, and the diameter of the scintillation film is larger than the size of the beam spot, so that all the beams can be absorbed by the scintillation film 3 to emit light; the thickness of the scintillation film 3 is 0.5 um-20 um, and the loss of beam current is hardly caused.
In the above embodiment, preferably, the scintillation film 3 is located at a geometric focus of an ellipsoid of the ellipsoid in the ellipsoidal reflector 1, and after bombarding the scintillation film, the beam emits light near the focus, and after being reflected by the ellipsoid, the light is concentrated at another focus of the ellipsoid.
In the above embodiment, preferably, the central point of the abutting surface between the photomultiplier tube 5 and the rear end of the quartz glass 401 is located at another geometric focus of the ellipsoid in the ellipsoidal reflector 1.
It should be noted that the quartz glass 401 has a good light transmission effect and is used for transmitting the light emitted by the scintillation film, so as to ensure the collection of photoelectrons by the photomultiplier tube. Meanwhile, vacuum and atmosphere can be isolated, vacuum sealing is kept, and the probe is ensured to be in a high-vacuum environment. The first flange 6 is a CF knife edge flange and is detachably connected with the supporting shielding pipe assembly 7, so that the photomultiplier 5 is convenient to install and overhaul.
In the above embodiment, preferably, as shown in fig. 1, fig. 2 and fig. 3, the driving mechanism 9 includes a base 901, a slider seat 902, a lead screw 903, a guide rail 904 and a driving motor 905, an upper end of the slider seat 902 is connected with a rear end of the bellows assembly 8, and two sliders 906 are respectively disposed on two sides of the lower end; the screw 903 is arranged above the base 901, and two ends of the screw are connected with the base 901; the lead screw 903 is in threaded connection with the slider seat 902; the two guide rails 904 are respectively arranged on the base 901 and located on two sides of the screw 903; the slider 906 is slidable on the guide rail 904 along the length of the guide rail 904; the driving motor 905 is connected with the lead screw 903 and is used for driving the lead screw 903 to rotate, so that the slider seat 902 moves on the lead screw 903 along the length direction of the lead screw 903 in a threaded manner, and the bellows assembly 8 is driven to stretch and contract.
In the above embodiment, preferably, the driving mechanism 9 further includes a mechanical stopper 907, an electro-optical stopper 908, and a displacement sensor 909; the mechanical stoppers 907 and the photoelectric stoppers 908 are sequentially arranged on the base 901 at intervals along the length direction of one of the guide rails 904 from back to front, and are used for positioning and limiting the slider 906; the sliding pull rod in the displacement sensor 909 is connected with the slider seat 902 through a connecting rod, and is used for acquiring displacement information of the slider 906, so as to realize real-time feedback of position information of the scintillation film.
In the above embodiment, preferably, the driving mechanism 9 further includes a signal connector fixing plate 910, and the signal connector fixing plate 910 is disposed on the base 901 for installing and fixing the signal and limiting connectors.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A detector for on-line monitoring of a weak particle beam, comprising:
the ellipsoidal reflector is a shell structure with an opening at one end, an ellipsoidal surface which is subjected to polishing treatment is arranged inside the shell structure, two through holes for beam passing are respectively formed in two sides of the ellipsoidal reflector along the beam incident direction and the beam emergent direction, and an incident hole and an emergent hole are respectively formed in the two through holes;
the scintillation film frame is fixed on the ellipsoidal surface inside the ellipsoidal reflecting piece;
the scintillation film is fixedly arranged on the scintillation film frame and is positioned in the center of the through hole on the ellipsoidal reflector;
the observation window flange is connected to the opening end of the ellipsoidal reflector to seal the ellipsoidal reflector, an observation hole is formed in the middle of the observation window flange, and a transparent part is arranged in the observation hole;
the front end of the photomultiplier extends into the observation hole of the observation window flange and is tightly contacted with the transparent piece;
the first flange is connected with the observation window flange in a sealing way;
the supporting and shielding assembly is connected with the first flange into a whole and is integrally sleeved outside the photomultiplier;
the corrugated pipe assembly is sleeved outside the supporting and shielding assembly, and the rear end of the corrugated pipe assembly is fixed with the rear end of the supporting and shielding assembly;
and the driving mechanism is used for driving the corrugated pipe assembly to stretch and contract along the length direction of the corrugated pipe assembly.
2. The detector of claim 1, further comprising a light shielding tube, wherein the light shielding tube is sleeved outside the photomultiplier tube and inside the supporting and shielding assembly; the observation window flange is provided with a groove sealed by rubber, the front end of the light avoiding tube is hermetically connected with the observation window flange, and the light avoiding tube is tightly matched with the photomultiplier.
3. The detector of claim 1, further comprising a second flange, wherein the second flange is sleeved outside the supporting and shielding assembly, the front end of the second flange is connected with the supporting and shielding assembly through a sliding guide sleeve, and the rear end of the second flange is connected with the front end of the corrugated pipe assembly.
4. The detector of claim 1, wherein a side of the scintillation membrane frame adjacent to the photomultiplier tube is a notched semicircular structure.
5. The detector of claim 1, wherein the scintillation film is a circular structure and has a diameter larger than the beam spot size, and the thickness of the scintillation film is 0.5-20 um.
6. The detector of claim 1, wherein said scintillation film is positioned within said ellipsoidal reflector at a geometric focal point of said ellipsoid.
7. The detector of claim 6, wherein the central point of the mating surface of the photomultiplier tube and the back end of the transparent member is located at another geometric focus of the ellipsoid within the ellipsoidal reflector.
8. The probe of any one of claims 1 to 7, wherein the drive mechanism includes a base, a slider mount, a lead screw, a guide rail, and a drive motor,
the upper end of the sliding block seat is connected with the corrugated pipe assembly, and two sliding blocks are arranged on two sides of the lower end of the sliding block seat respectively;
the lead screw is arranged above the base and is connected with the base; the lead screw is in threaded connection with the sliding block seat;
the two guide rails are respectively arranged on the base and positioned on two sides of the screw rod; the sliding block can slide on the guide rail along the length direction of the guide rail;
the driving motor is connected with the lead screw and used for driving the lead screw to rotate so as to enable the sliding block seat to move on the lead screw along the length direction of the lead screw in a threaded mode.
9. The detector of claim 8, wherein the driving mechanism further comprises a mechanical stop, an electro-optical stop, and a displacement sensor;
the mechanical limiting parts and the photoelectric limiting parts are sequentially arranged on the base at intervals along the length direction of one of the guide rails from back to front and are used for positioning and limiting the sliding block;
and a sliding pull rod in the displacement sensor is connected with the sliding block seat through a connecting rod and used for acquiring displacement information of the sliding block.
10. The probe of claim 9, wherein the drive mechanism further comprises a signal connector mounting plate disposed on the base for mounting a signal and limit connector.
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| CN202110433605.XA CN113156485B (en) | 2021-04-20 | 2021-04-20 | Detector for weak particle beam on-line monitoring |
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| CN202110433605.XA CN113156485B (en) | 2021-04-20 | 2021-04-20 | Detector for weak particle beam on-line monitoring |
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Cited By (1)
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| CN114531782A (en) * | 2022-02-15 | 2022-05-24 | 中国科学院近代物理研究所 | Beam position and current intensity measuring device for radiation area |
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