CN107728191B - Four-channel space localization X-ray radiation flow diagnosis device - Google Patents
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- CN107728191B CN107728191B CN201711169737.6A CN201711169737A CN107728191B CN 107728191 B CN107728191 B CN 107728191B CN 201711169737 A CN201711169737 A CN 201711169737A CN 107728191 B CN107728191 B CN 107728191B
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- 230000005855 radiation Effects 0.000 title claims abstract description 50
- 238000003745 diagnosis Methods 0.000 title abstract description 9
- 230000004807 localization Effects 0.000 title abstract description 8
- 239000011148 porous material Substances 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 5
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 12
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- 238000003384 imaging method Methods 0.000 description 4
- 239000006187 pill Substances 0.000 description 4
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- 238000007906 compression Methods 0.000 description 2
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- 230000004927 fusion Effects 0.000 description 2
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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
- G01T1/2914—Measurement of spatial distribution of radiation
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Abstract
The invention discloses a four-channel space localization X-ray radiation flow diagnosis device, wherein a black cavity in the device is arranged in front of a four-channel pinhole lens assembly, X-rays emitted by different areas in the black cavity pass through the four-channel pinhole lens assembly and an aiming node, then pass through limiting holes at fluorescent plates with holes on four different channels, reach the sensitive surface of an XRD detector, and generate pulse current signals; the device comprises four channels which aim at four local areas in the black cavity respectively; the precise pinholes and limiting holes on each channel can determine different areas inside the black cavity so as to realize the precise measurement of the X-ray radiation flowing domains in four areas. According to the invention, the aiming node is adopted to observe the aiming position, and the change of the axis of the system is monitored by matching with the dial indicator, so that the reliability and stability of the aiming of the system are improved. The invention can simultaneously realize the measurement of the radiation flow time evolution of different areas in the black cavity, and has very wide application prospect.
Description
Technical Field
The invention relates to the field of X-ray detection, in particular to a four-channel space localization X-ray radiation flow diagnosis device.
Background
In the existing X-ray radiation flow measurement technology, the space resolution radiation flow measurement system has the advantages of quantitative measurement, time resolution, space localization and the like, and plays an important role in indirectly driving inertial confinement fusion X-ray radiation flow diagnosis. The spatial resolved radiation flux detection apparatus based on the precision pinhole and XRD detector can provide fine data with high time precision and space precision for the study of black cavity energetics, and the basic principle is described in a paper named as direct measurement of radiation flux in a designated area inside a black cavity (Direct measurement of x-ray flux for a pre-specific high-resolved region in hohlraum, kuan Ren, shenye Liu, life i Hou et al Optics Express,2015, 23 (19), 240938).
The space resolution radiation flow measuring system in the prior art is a single-channel system, only one region in the black cavity can be measured in each experiment, and X-ray radiation flow time evolution signals of a plurality of different regions cannot be obtained simultaneously; because the system adopts the perforated lens to assist the system in aiming, but because the visible light optical axis of the perforated lens is not coaxial with the X-ray optical axis, the aiming adjustment of the system is very complex; when the aiming position of the system is adjusted, only the limiting hole can be adjusted, but the margin for adjusting the limiting hole is very limited because the size of the sensitive surface of the rear-end XRD detector is smaller, so that the aiming range of the system is greatly influenced; in addition, the system is used and trompil imaging plate record limit hole surrounding area X ray image, need take out imaging plate for the scanning after every experiment, lead to there to be serious rocking in the system axis, aim stability relatively poor.
Disclosure of Invention
In order to overcome the defects that the system is difficult to aim, the aiming stability is poor, the field of view adjustment range is small, and only one regional X-ray radiation flow signal can be obtained in each experiment in the prior art, the invention provides a four-channel space localization X-ray radiation flow diagnosis device. The invention can be used for realizing simultaneous measurement of radiation flow time evolution signals in four areas in the black cavity, has stable and reliable system aiming and wide field of view adjusting range, and has wide engineering application prospect.
The scheme is realized by the following technical measures:
a four-channel space localization X-ray radiation flow diagnosis device comprises an X-ray radiation source, a four-channel pinhole lens assembly, an aiming node, an axial two-dimensional adjustment system, a dial indicator, a single-channel two-dimensional adjustment mechanism, a visible light CCD, a plane reflector, an open-pore fluorescent plate, an XRD detector, an attenuator, an oscilloscope and an acquisition computer; the XRD detector, the attenuator, the oscilloscope and the acquisition computer are electrically connected in sequence; x-rays emitted by an X-ray radiation source are sequentially emitted to an XRD detector through a four-way pinhole lens assembly, an aiming joint, an axial two-dimensional adjusting system, a dial indicator, a single-channel two-dimensional adjusting mechanism and an open-pore fluorescent plate; the visible light reflected on the perforated fluorescent plate is reflected to the visible light CDD through the plane reflector; the pulse current signal generated by the XRD detector is attenuated to the range of the measuring range of the oscilloscope through the signal attenuator, and is collected by the collecting computer.
As a preferred embodiment of the present invention: the four-channel pinhole lens assembly comprises four pinhole lenses, and the center of each pinhole lens can be sequentially arranged on the same light path with the centers of the perforated fluorescent plate and the XRD detector.
As a preferred embodiment of the present invention: the included angle between the plane reflector and the light path of the corresponding channel is 40-60 degrees.
As a preferred embodiment of the present invention: the axial two-dimensional adjusting system can carry out two-dimensional adjustment on the optical axis of X-rays.
As a preferred embodiment of the present invention: the dial indicator detects the shake of the X-ray optical axis.
As a preferred embodiment of the present invention: the X-ray radiation source is a black cavity which is irradiated by high-power laser to generate X-rays.
As a preferred embodiment of the present invention: the aiming positions of the four pinhole lenses can be independently adjusted.
As a preferred embodiment of the present invention: the XRD detector is a flat response XRD detector.
The basic principle of the scheme is as follows: the cavity wall of the black cavity will generate X-rays after being irradiated by high-power laser, and the laser power densities of different areas are different, so that the intensity and energy spectrum of the X-ray radiation flow are different. The device adopts four channels to measure the X-ray radiation flows in different areas inside the black cavity, the four channels are independently regulated, the different channels can aim at the same area, and also can aim at different areas, and the time evolution signals of the X-ray radiation flows in four determined areas can be obtained simultaneously, so that the simultaneous measurement of the radiation flows in a facula area, a re-emission area and a filling plasma area inside the black cavity is realized. The aiming area of each channel is determined by using a pinhole and a limiting hole on an open-pore fluorescent plate, and the area scale is about 200 um. The aiming node is adopted to record the position of the black cavity, so that the axis of the system can be effectively adjusted. The dial indicator with the precision of 1 um is adopted to monitor the shaking of the system axis, so that the system axis can be quickly and accurately reset when the system axis changes, and the influence of the change of the system axis on aiming areas of different channels is avoided. The X-ray is converted into visible light by using an open screen in different channels, and the visible light is reflected into the CCD by using a plane reflector to measure the X-ray image around the upper limit hole of the open screen for determining the aiming position of the channel.
The technical scheme has the beneficial effects that as the four-channel measuring device is used for measuring different areas in the black cavity in the scheme, radiation flow time evolution signals of areas such as a light spot area, a re-emitting area, a filling plasma area and the like in the black cavity can be obtained at the same time, and the accuracy and the reliability of the current indirect driving inertial confinement fusion X-ray radiation flow diagnosis can be greatly improved. Meanwhile, different channels can aim at the same area, XRD detectors with different energy sections, such as a flat response XRD detector (the energy area is 0.1-4.4 keV) and an M-band XRD detector (the energy area is 1.6-4.4 keV) are used at the rear end, the X-ray radiation flow intensities of different energy bands in the same area can be measured simultaneously, and the share of M-band X-rays (the energy area is 1.6-4.4 keV) in the area can be obtained and used for researching the characteristic of converting laser energy in different areas into M-band X-rays and the influence of the M-band X-rays on implosion compression asymmetry. In addition, the invention adopts the aiming node to record the position of the target, and when the aiming area changes, the system axis can be directly reset through the aiming node, so that the aiming stability of the system is improved. In addition, the stability of the system axis is monitored by adopting the dial indicator, and when the system axis shakes due to external force or other factors, the axis can be quickly and accurately reset, so that the accuracy of the aiming positions of the four channels is ensured. Meanwhile, the invention adopts the perforated fluorescent plate to convert the X-rays into visible light, can realize on-line direct measurement, replaces the perforated imaging plate in the original system, greatly simplifies the application difficulty of the system and improves the aiming stability of the system. The invention can simultaneously realize the measurement of the radiation flow time evolution of different areas in the black cavity, and has very wide application prospect.
It is seen that the present invention provides substantial features and improvements over the prior art, as well as significant advantages in its practice.
Drawings
FIG. 1 is a schematic diagram of the structure of a four-channel spatially localized X-ray radiation flow diagnostic device of the present invention.
Fig. 2 is a schematic diagram of a four-channel pinhole lens assembly of a four-channel spatially localized X-ray radiation flux diagnostic device of the present invention.
Fig. 3 is a schematic diagram of an embodiment 1 of a four-channel spatially localized X-ray radiation flow diagnostic device of the present invention.
Fig. 4 is a schematic diagram of an embodiment 2 of a four-channel spatially localized X-ray radiation flow diagnostic device of the present invention.
In the figure, 1 is a black cavity, 2 is a four-channel pinhole lens assembly, 3 is a sighting node, 4 is an axial two-dimensional adjusting system, 5 is a dial indicator, 6 is a single-channel two-dimensional adjusting mechanism, 7 is a visible light CCD, 8 is a plane reflector, 9 is an open-pore fluorescent plate, 10 is an XRD detector, 11 is an attenuator, 12 is an oscilloscope, 13 is an acquisition computer, 14 is a metal plate, 15 is an open-pore lens, 16 is a precise pinhole, 17 is a plane sample A, 18 is a plane sample B, and 19 is a target pill.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any 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. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
Fig. 3 is a schematic diagram of an embodiment 1 of a four-channel spatially localized X-ray radiation flow diagnostic device of the present invention. In fig. 3, a four-channel space localization X-ray radiation flow diagnosis apparatus according to the present invention, wherein two channels aim at a light spot area and a non-light spot area of a cavity wall of a black cavity 1, and the other two channels aim at a plane sample a17 and a plane sample B18, respectively, and the plane sample a17 and the plane sample B18 are symmetrically placed in the middle of the black cavity, so that albedo data of two samples at different radiation temperatures can be obtained by measuring radiation flows of the two samples. The device comprises a four-way pinhole lens assembly 2, an aiming joint 3, an axial two-dimensional adjusting system 4, a dial indicator 5, a single-channel two-dimensional adjusting mechanism 6, a visible light CCD7, a plane mirror 8, an open-pore fluorescent plate 9, an XRD detector 10, an attenuator 11, an oscilloscope 12 and an acquisition computer 13. The four-channel pinhole lens assembly 2 comprises four pinhole lenses, and the center of each pinhole lens, the center of the perforated fluorescent plate 9 and the center of the XRD detector 10 are sequentially arranged on the same light path. The XRD detector 10, the attenuator 11, the oscilloscope 12 and the acquisition computer 13 are electrically connected in sequence. The plane reflector 8 forms an included angle with the light path of the corresponding channel, and is used for reflecting the visible light on the perforated fluorescent plate 9 to the visible light CCD for imaging. X-rays emitted by four areas in the black cavity 1 pass through the four-way pinhole lens assembly 2 and the aiming node 3, then pass through a limiting hole on the perforated fluorescent plate 9 to reach the sensitive surface of the XRD detector 10, generate pulse current signals, and the pulse current signals are attenuated to the range of the measuring range of the oscilloscope 12 through the signal attenuator 11 and are collected by the collecting computer 13; the X-ray image produced by the area around the aperture limit on the aperture fluorescent plate 9 can be used to determine the area inside the black cavity at which each channel is aimed.
The center-to-center distance between the four-channel pinhole lens assembly 2 and the black cavity 1 is 200 mm, and the center-to-center distance between the limiting hole on the perforated fluorescent plate and the four-channel pinhole lens assembly is 2000 mm.
Each lens in the four-channel pinhole lens assembly 2 has a diameter of 10 mm and a spacing between the centers of the two pinholes of 16mm. The focal length of the aiming at joint 3 is 500 mm. The included angle between the plane reflecting mirror 8 and the light path of the corresponding channel is 45 degrees. The XRD detectors 10 are all flat response XRD detectors.
According to the invention, the aiming section 3 can aim the black cavity 1, and the axial two-dimensional adjusting system 4 is used for two-dimensionally adjusting the system axis, so that the adjusting precision is 50um, and the black cavity 1 is ensured to be positioned at the center of the view field of the aiming section 3.
In the invention, when the X-ray sighting is performed, four channels are respectively calibrated by adopting a cross-hair target, and connecting lines formed by the centers of a precise pinhole 16, an open-pore fluorescent plate 9 and an XRD detector 10 in each channel pass through the cross-hair center of the cross-hair target. During specific adjustment, each channel is independently adjusted, firstly, a reference light path is determined by the center of a cross wire target and the center of an XRD detector 10, and the centers of a precise pinhole 16 and an open-pore fluorescent plate 9 are adjusted to the reference light path; secondly, a DPL laser is used for polishing a cross wire target, visible light reflected by the cross wire target is collected through an opening lens 15 and imaged on an opening fluorescent plate 9, a plane mirror 8 reflects a visible light image on the opening fluorescent plate 9 to a visible light CCD7, and the center of the cross wire image is exactly overlapped with the center of the opening fluorescent plate 9 by adjusting the rotation and the offset of the opening lens 15, so that the offline collimation of the optical path of the channel can be completed; according to the same steps, the rest three channels are sequentially adjusted, and the off-line aiming of the device can be achieved.
When the invention is aimed on line, the system is arranged on the upper region of the magic light III prototype device, the inner region of the black cavity 1 is observed from top to bottom, the black cavity 1 is positioned at the center of the view field of the aiming joint 3 by adjusting the axial two-dimensional adjusting system 4, then, two channels are respectively aimed at the facula region and the non-facula region of the cavity wall of the black cavity 1 by adjusting the single-channel two-dimensional adjusting mechanism 6, and the other two channels are respectively aimed at the plane sample A17 and the plane sample B18 in the middle of the black cavity 1.
In the invention, during on-line measurement, X-rays emitted by different areas in the black cavity 1 reach the sensitive surface of the XRD detector 10 through the precise pinhole 16 and the limiting hole of the perforated fluorescent plate 9, and a pulse current signal is generated, namely the absolute X-ray radiation flow of a specific area measured by the system. The X-ray image recorded in the area around the upper limit of the aperture fluorescent plate 9 corresponds to the X-ray image of the interior of the black chamber 1 and can be used to confirm the specific source area of the radiation flow measured by the XRD detector 10.
Example 2
Fig. 4 is a schematic diagram of a four-channel spatially localized X-ray radiation flow diagnostic apparatus of embodiment 2 of the present invention.
In fig. 4, the basic structure of this embodiment is the same as that of embodiment 1, and two channels aim at the facula area and the non-facula area of the wall of the black cavity 1 respectively, except that two other channels aim at the target pill 19 in the middle of the black cavity, one channel adopts a flat response XRD detector (the energy area is 0.1-4.4 keV), and the other channel adopts an M-band XRD detector (the energy area is 1.6-4.4 keV), so that the method can be used for measuring the intensity of the X-ray radiation flow of different energy bands generated in the irradiation compression process of the target pill, and obtaining the M-band share of the radiation flow generated by the target pill.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (5)
1. A four-channel spatially localized X-ray radiation flow diagnostic device characterized by: the system comprises an X-ray radiation source, a four-way pinhole lens assembly, an aiming node, an axial two-dimensional adjusting system, a dial indicator, a single-channel two-dimensional adjusting mechanism, a visible light CCD, a plane reflector, an open-pore fluorescent plate, an XRD detector, an attenuator, an oscilloscope and a collecting computer; the XRD detector, the attenuator, the oscilloscope and the acquisition computer are electrically connected in sequence; x-rays emitted by the X-ray radiation source are sequentially emitted to the XRD detector through the four-way pinhole lens assembly, the aiming node, the axial two-dimensional adjusting system, the dial indicator, the single-channel two-dimensional adjusting mechanism and the perforated fluorescent plate; the visible light reflected on the perforated fluorescent plate is reflected to the visible light CDD through a plane reflector; the pulse current signal generated by the XRD detector is attenuated to the range of the measuring range of the oscilloscope through the signal attenuator and is collected by the collecting computer; the four-way pinhole lens assembly comprises four pinhole lenses, and the center of each pinhole lens can be sequentially arranged on the same optical path with the centers of the perforated fluorescent plate and the XRD detector; the aiming positions of the four pinhole lenses can be independently adjusted; different channels can aim at the same area or different areas, and can simultaneously obtain the time evolution signals of the X-ray radiation flows in four determined areas; the included angle between the plane reflecting mirror and the light path of the corresponding channel is 40-60 degrees.
2. A four-channel spatially localized X-ray radiation flow diagnostic device in accordance with claim 1, wherein: the axial two-dimensional adjusting system can perform two-dimensional adjustment on the optical axis of X-rays.
3. A four-channel spatially localized X-ray radiation flow diagnostic device in accordance with claim 1, wherein: the dial indicator detects the shake of the X-ray optical axis.
4. A four-channel spatially localized X-ray radiation flow diagnostic device in accordance with claim 1, wherein: the X-ray radiation source is a black cavity which is irradiated by high-power laser to generate X-rays.
5. A four-channel spatially localized X-ray radiation flow diagnostic device in accordance with claim 1, wherein: the XRD detector is a flat response XRD detector.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108413194A (en) * | 2018-03-14 | 2018-08-17 | 中国工程物理研究院激光聚变研究中心 | Regulating device, X-ray detector and X-ray detection system |
| CN109444947B (en) * | 2019-01-08 | 2023-08-18 | 中国工程物理研究院激光聚变研究中心 | X-ray radiation flow diagnosis system |
| CN111443376B (en) * | 2020-04-09 | 2022-03-29 | 中国工程物理研究院激光聚变研究中心 | Data extraction method of spatial resolution radiation flow detection technology |
| CN112666596B (en) * | 2020-12-17 | 2022-03-22 | 中国工程物理研究院激光聚变研究中心 | Laser fusion neutron irradiation effect testing device |
| CN113655512B (en) * | 2021-06-29 | 2024-05-07 | 中国工程物理研究院激光聚变研究中心 | Method for measuring symmetry of X-ray radiation of black cavity M band |
| CN114859392B (en) * | 2022-03-24 | 2024-06-21 | 西北核技术研究所 | System and method for measuring soft X-ray energy fluence by using pinhole array |
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