WO2019137096A1 - Quick detection system for photoelectric cathode of x-ray streak camera - Google Patents

Abstract

A quick detection system for a photoelectric cathode (201) of an X-ray streak camera, comprising a light source (10), a vacuum chamber (20), a trine streak image converter tube group, a CCD camera (302), and a computer (40). The light source (10) emits a test light signal to the incident end of the trine streak image converter tube group. The trine streak image converter tube group comprises a first streak image converter tube (T1), a second streak image converter tube (T2), and a third streak image converter tube (T3). The CCD camera (302) is provided on the emergent end of the trine streak image converter tube group and used for acquiring a test image of the emergent end of the trine streak image converter tube group. The CCD camera (302) is connected with the computer (40). The computer (40) is used for processing the test image. By adjusting the voltage, structure and relative position of the trine streak image converter tube group, three slits are simultaneously imaged in a detectable center area of the CCD camera (302), and three photoelectric cathodes (201) can be replaced by opening a cathode replacing window (202) of the vacuum chamber (20), so that simultaneous and quick detection of the photoelectric cathodes (201) of the X-ray streak camera can be achieved.

Description

X-ray stripe camera photocathode rapid detection system Technical field

The present invention relates to an X-ray stripe camera, and more particularly to an X-ray stripe camera photocathode rapid detection system.

Background technique

X-ray stripe cameras can image X-ray and ultraviolet light signals, but are generally referred to as X-ray stripe cameras. X-ray stripe camera is an important diagnostic instrument for obtaining continuous spatiotemporal change information of ultra-fast X-ray/ultraviolet radiation. Imaging research of X-ray/ultraviolet ultrafast phenomenon on natural science, clean energy, material physics, photobio, photochemistry, super Short-wave technology, laser physics, high-energy physics and other scientific research and technology fields play an important role. In particular, it is an indispensable diagnostic instrument for obtaining impulsive dynamics and implosion compression information in laser-driven inertial confinement fusion to obtain continuous spatiotemporal changes of plasma radiation.

The photocathode of the X-ray stripe camera converts the ultra-fast optical pulse to be converted into an electronic pulse by photoelectric conversion. The electronic pulse carries the optical pulse information in time, space and intensity, which is the first step of the diagnostic imaging of the stripe camera. Commonly used in X-ray stripe cameras, the photocathodes are gold (Au) and cesium iodide (CsI). Both photocathodes will degrade or fail due to long-term, high-intensity X-ray bombardment, especially CsI photoelectric conversion. The quantum efficiency is high, but it is easy to decompose and crystallize, and it will fail after being exposed to air for several hours. In addition, the difference in cathode fabrication process and the thickness of the film layer also affect the imaging stability of the camera. With the increase of X-ray energy and intensity, it is important and necessary to periodically check the effectiveness of the photocathode and screen the photocatalyst with stable performance.

At present, the photocathode film can only be obtained from the appearance observation, and when it is mounted on an X-ray stripe camera for diagnostic imaging, it can be concluded whether the photocathode is effective, and a large number of photocathode films can only be inspected one by one. This method not only has high detection cost and low efficiency, but the imaging quality of different photocathode films cannot be compared in the same image.

Summary of the invention

The technical problem to be solved by the present invention is to provide a X-ray stripe camera photocathode rapid detection system for the above-mentioned defects of the prior art.

The technical solution adopted by the present invention to solve the technical problem thereof is: constructing an X-ray stripe camera photocathode rapid detection system, comprising a light source, a vacuum chamber, a trinity stripe image tube set, a CCD camera, and a computer, wherein

The light source is disposed on an incident end side of the trinity stripe image tube group, and a test light signal emitted by the light source is directed to an incident end of the trinity stripe image tube group;

The trinity stripe image tube assembly includes a first stripe image tube, a second stripe image tube, and a third stripe image tube;

The CCD camera is disposed at an exit end of the Trinity stripe image tube set for collecting a test image of an exit end of the Trinity stripe image tube group;

The CCD camera is coupled to the computer for processing the test image.

Preferably, in the X-ray stripe camera photocathode rapid detection system of the present invention, the first stripe image tube, the second stripe image tube, and the third stripe image tube are arranged side by side, and the first stripe is changed. The incident end of the image tube, the second stripe image tube, and the third stripe image tube are located on the same side for receiving the test light signal;

The light source is an X-ray source or an ultraviolet light source.

Preferably, the X-ray stripe camera photocathode rapid detection system of the present invention has the same structure of the first stripe image tube, the second stripe image tube, and the third stripe image tube;

The first stripe image changing tube includes a photocathode, a grid, a focusing electrode, an anode, and a deflecting plate, wherein the photocathode is detachably mounted on an incident end of the first stripe image tube through a cathode base For converting a light pulse into an electron pulse, the photocathode is parallel to the grid; the focusing electrode is located in a flight path of the first stripe image tube and is axially symmetrically distributed; the anode is located in the first A flight path of the stripe image tube is axially symmetrically distributed; the deflector plate is located on both sides of the exit end of the first stripe image tube and is symmetrically distributed.

Preferably, in the X-ray stripe camera photocathode rapid detection system of the present invention, the first stripe image tube, the second stripe image tube, and the third stripe image tube are located in a vacuum chamber;

A side of the entrance end of the vacuum chamber adjacent to the first stripe image tube, the second stripe image tube, and the third stripe image tube is provided with a test light signal input window for entering the test light signal.

Preferably, the X-ray stripe camera photocathode rapid detection system of the present invention has an openable cathode replacement window on the vacuum chamber, the opening position of the cathode replacement window and the first stripe image tube, Corresponding ends of the second stripe image tube and the third stripe image tube, and the cathode replacement window provides an operation space for replacing the photocathode when the cathode replacement window is opened.

Preferably, in the X-ray stripe camera photocathode rapid detection system of the present invention, the exit ends of the first stripe image tube, the second stripe image tube, and the third stripe image tube are provided for receiving the exit end. a fluorescent screen that emits light and emits light, wherein the fluorescent screen is a common fluorescent screen for the first stripe image tube, the second stripe image tube, and the third stripe image tube;

The CCD camera is disposed at one side of the fluorescent screen for collecting a test image on the fluorescent screen.

Preferably, in the X-ray stripe camera photocathode rapid detection system of the present invention, the first stripe image tube, the second stripe image tube, and the third stripe image tube are fixed by an upper splint and a lower splint, The lower jaw is fixed to the inner wall of the vacuum chamber.

Preferably, the X-ray stripe camera photocathode rapid detection system of the present invention further comprises a vacuum gauge for measuring the vacuum degree in the vacuum chamber;

The vacuum chamber is connected to a vacuum pump for changing the degree of vacuum in the vacuum chamber.

Preferably, in the X-ray stripe camera photocathode rapid detection system of the present invention, the first stripe image tube, the second stripe image tube, and the third stripe image tube are respectively connected to a power supply;

The first stripe image tube, the second stripe image tube, and the third stripe image tube are grounded by a common ground electrode.

Preferably, the X-ray stripe camera photocathode rapid detection system of the present invention, the first stripe image tube, the second stripe image tube, and the third stripe image tube are respectively connected to a power supply through a high voltage input flange;

The power supply includes a high voltage power supply and a voltage divider, and the high voltage power supply is respectively connected to the first stripe image tube, the second stripe image tube, and the third stripe image tube through the voltage divider.

The X-ray stripe camera photocathode rapid detection system embodying the invention has the following beneficial effects: a light source, a vacuum chamber, a trinity stripe image tube set, a CCD camera, and a computer, wherein the light source is disposed in the trinity stripe image tube On the incident end side of the group, the test light signal from the light source is directed to the incident end of the Trinity stripe image tube group; the Trinity stripe image tube group includes the first stripe image tube, the second stripe image tube, and the third stripe image The CCD camera is disposed at the exit end of the Trinity stripe image tube set for collecting the test image of the exit end of the Trinity stripe image tube set; the CCD camera is connected to the computer, and the computer is used to process the test image. By implementing the present invention, by adjusting the voltage, structure and relative position of the trinity stripe image tube group, the three slits are simultaneously imaged in a central area detectable by the CCD camera, and the X-ray stripe camera photocathode is simultaneously and quickly detected.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of a photocathode rapid detection system of an X-ray stripe camera according to the present invention;

2 is a schematic structural view of a three-in-one stripe image tube group of the present invention;

3 is a schematic cross-sectional structural view of a first stripe image tube of the present invention;

Figure 4 is a test image of an experiment of the present invention;

Figure 5 is a spatial resolution test image of an experiment of the present invention.

Detailed ways

For a better understanding of the technical features, objects and effects of the present invention, the embodiments of the present invention are described in detail with reference to the accompanying drawings.

1 is a schematic structural view of a photocathode rapid detection system of an X-ray stripe camera according to the present invention.

Specifically, the X-ray stripe camera photocathode rapid detection system comprises a light source 10, a trinity stripe image tube set, a CCD camera 302, a power supply, and a computer 40, wherein the light source 10 is disposed at an incident end of the Trinity stripe image tube set On the side, the test light signal from the light source 10 is directed to the incident end of the Trinity stripe tube group. Preferably, the light source 10 is an X-ray source or an ultraviolet light source. In this embodiment, an ultraviolet disc-shaped lamp is taken as an example for detection. The detection of X-rays can be referred to. The Trinity stripe image tube group receives the input test light signal to generate a test image. The CCD camera 302 is disposed at the exit end of the Trinity stripe image tube set for acquiring a test image of the exit end of the Trinity stripe image tube set. The CCD camera 302 is connected to the computer 40 and transmits the test image to the computer 40. The computer 40 processes the test image according to a preset algorithm to obtain a test result.

The power supply is used to supply power to the entire detection system, and the power supply is respectively connected to the trinity stripe image tube group and the CCD camera 302, wherein the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 are respectively connected. The power supply is connected, and the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 are grounded through a common ground electrode. Preferably, the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 are respectively connected to the power supply via the high voltage input flange 503. Further, the power supply includes a high voltage power supply 501 and a voltage divider 502. The high voltage power supply 501 is connected to the first stripe image tube T1, the second stripe image tube T2, the third stripe image tube T3, and the CCD through the voltage divider 502. Camera 302.

2 is a schematic view showing the structure of a three-in-one stripe image tube group of the present invention.

Specifically, the trinity stripe image tube group includes a first stripe image tube T1, a second stripe image tube T2, a third stripe image tube T3, a first stripe image tube T1, and a second stripe image tube T2. The third stripe image tube T3 is arranged side by side, and the incident ends of the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 are located on the same side for receiving the test light signal. Preferably, the structures of the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 in the embodiment are the same, thereby implementing simultaneous testing of three photocathodes, and performing experimental results. Intuitive comparison, the imaging quality of the three cathodes is compared in the same image to improve the test efficiency.

The Trinity Stripe Transformer Tube Group is the core component of the X-ray stripe camera cathode detection system. According to the theoretical design and engineering requirements, the problem of mutual constraints between large working area, small volume and high withstand voltage is balanced and optimized. The stripe image tube electron optical system and electrode structure.

Fig. 3 is a schematic cross-sectional view showing the first stripe image tube of the present invention.

Specifically, the first stripe image tube T1 is a seven-electrode electrostatic focusing type stripe image tube including a photocathode 201 (P/C in the drawing), a grid M, a focusing electrode F, an anode A, and a deflecting plate DP, wherein The photocathode 201 is detachably mounted on the incident end of the first stripe image tube T1 through the cathode base for converting the light pulse into an electron pulse, and the electron pulse carries the light pulse information in time, space and intensity. It is the basis for diagnostic imaging of stripe cameras. Also, it is necessary to ensure that the photocathode 201 and the grid M are strictly parallel, so that the uniform acceleration field of the photoelectrons is not destroyed. The focus electrode F includes a first focus electrode barrel F1 and a second focus electrode barrel F2, and the first focus electrode barrel F1 and the second focus electrode barrel F2 are located on both sides of the flight path of the first stripe image tube T1 and are symmetrically distributed. The anode A includes a first anode cylinder A1 and a second anode cylinder A2, and the first anode cylinder A1 and the second anode cylinder A2 are located on both sides of the flight path of the first fringe tube T1 and are symmetrically distributed. The first focus electrode cylinder F1, the second focus electrode cylinder F2, the first anode cylinder A1, and the second anode cylinder A2 are arranged at intervals. The deflector plate DP is located on both sides of the exit end of the first stripe image tube T1 and is symmetrically distributed. In addition, there are common grounding electrodes between the electrodes to ensure that the respective focusing and anode electrodes are independent of each other, and the electrostatic fields do not interfere with each other. The exit end of the first stripe image tube T1 is aligned with the phosphor screen 301 (P/S in the figure)

The second stripe image tube T2 and the third stripe image tube T3 have the same structure as the first stripe image tube T1, and the first stripe image tube T1 can be referred to, and details are not described herein again.

Further, the use of precision mount tires allows the electrodes to be both suspended and maintain a precise symmetrical structure. Preferably, the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 are fixed by the upper and lower plates, the electrode leads of the above electrodes are introduced by the upper plate, and the lower plate is fixed by the vacuum. On the inner wall of the chamber 20.

In this embodiment, the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 are located in the vacuum chamber 20, and the vacuum chamber 20 is adjacent to the first stripe image tube T1 and the second stripe is changed. A test light signal input window 203 for testing the entrance of the optical signal is disposed on the incident end side of the image tube T2 and the third stripe image tube T3. In the non-test phase, the vacuum chamber 20 is disposed near the incident end side of the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3, and is provided with a detachable vacuum shutter valve 204 through the vacuum. The gate valve 204 closes the vacuum chamber 20. In the test phase, the vacuum shutter valve 204 is removed.

In order to replace the photocathode more conveniently and quickly, the vacuum chamber 20 has an openable cathode replacement window 202, and the opening position of the cathode replacement window 202 is aligned with the first stripe image tube T1, the second stripe image tube T2, and the third stripe. The incident end of the image tube T3 corresponds to, and when the cathode replacement window 202 is opened, an operation space is provided for replacing the photocathode 201. When the vacuum shutter valve 204 is closed, the cathode replacement window 202 is opened, and the three photocathodes 201 can be easily and quickly replaced using the cathode plug-in tool. The isolation experimental target chamber can be realized, and the photocathode 201 can be quickly replaced without destroying the vacuum of the experimental target chamber and without disassembling the calibration system. The system is compact and allows simultaneous detection and rapid replacement of three photocathodes.

The exit end of the first stripe image tube T1, the second stripe image tube T2, and the third stripe image tube T3 is provided with a phosphor screen 301 for receiving an electron beam emitted from the exit end and emitting light, and the phosphor screen 301 is a first stripe image tube. The T1, the second stripe image tube T2, and the third stripe image tube T3 share a fluorescent screen. A CCD camera 302 is disposed on one side of the phosphor screen 301 for collecting test images on the screen. The three stripe image tubes share a phosphor screen 301 and a CCD camera 302, which can save cost and reduce volume, and can also achieve imaging quality of three cathodes in the same image.

The vacuum chamber 20 further includes a vacuum gauge 205 for measuring the degree of vacuum in the vacuum chamber 20; the vacuum chamber 20 is connected to a vacuum pump 206 for changing the degree of vacuum in the vacuum chamber 20. The vacuum pump 206 is connected to the voltage divider 502 through a high voltage input flange 503, and the partial pressure 502 is connected to the high voltage power source 501 to supply power to the vacuum pump 206.

The above system was tested by experiments below.

Photoelectric cathode detection system test principle is shown in Figure 1, the light source 10 is an ultraviolet disk lamp. After the test is started, the vacuum shutter valve 204 is replaced with an ultraviolet light input window, and the ultraviolet light emitted by the ultraviolet disk lamp is simultaneously irradiated on the three stripe image tubes (the first stripe image tube T1 and the second stripe image tube T2). The third stripe is on the photocathode (Au cathode) of the tube T3). The photocathode emits photoelectrons, which are respectively accelerated and focused in three stripe image tubes, imaged onto the same phosphor screen 301 and converted into visible light, and then converted into digital signals by the light cone coupling into the CCD camera 302. The photocathode 201 is photolithographically patterned with a center of 15 lp/mm and 10 lp/mm at both ends. By obtaining a digital image of the grading pattern on the photocathode 201, the effectiveness of the photocathode 201 and the imaging quality of the system can be calibrated and detected. .

A high voltage power supply and voltage divider are used to provide a stable DC high voltage to each electrode of the stripe tube. The photocathode 201 has a pattern length of 30 mm, a phosphor screen of 301 Φ 50 mm, a PI 1300 CCD camera 302 of 1300×1340 pixels, and a pixel size of 20×20 μm ^{2 with a} 1.5:1 coupling cone.

Photoelectric cathode detection system test image As shown in Fig. 4, the Trinity stripe image tube group forms three stripe images of about 39 mm in length in the image of the same CCD camera 302, and the stripe image is placed in the central region of the 40.2×39 mm ² CCD camera 302. The stripe images have no overlap and interference with each other, and the whole is parallel to each other without significant bending. The stripe image is slightly wider to the left than the right side, and the T2 stripe (imaged by the second stripe image tube T2) is completely in the imaging area of the screen 301, and the T1 stripe (the first) The image of the stripe image tube T1 and the T3 stripe (imaged by the third stripe image tube T3) slightly exceed the imaged area at the upper end, and the resolution pattern area is clear overall. The test results confirmed the effectiveness of the three photocathodes 201.

The positions of the three stripe image centers in the slit direction are 619, 656, and 621 pixels, respectively, and the maximum deviation is 37 pixels. The maximum shift rate δ _y of the slit direction image is:

The same method can be used to obtain an offset of 6.6% of the image perpendicular to the slit direction. The data is shown in Table 1.

Table 1 image shift rate test data

The middle 3mm pattern area of the T1 image, the starting point and the ending point are 480, 688 pixels, the length is 128 pixels, and the light cone magnification is 1.5:1, then the stripe image magnification M ₁ is:

The magnification of the stripe tube T1 is 1.28. The same method can measure the magnification of T2 and T3 to 1.29 and 1.29. The system magnification test data is shown in Table 2. The imaging error of the three stripe image tubes is up to 0.8%, and the system magnification has good consistency.

Table 2 system magnification test data

parameter	T1 stripe	T2 stripe	T3 stripes
Stripe position/pixel	480	517	484
Stripe vertical position / pixel	688	646	612
Length/pixel	128	129	128
Magnification	1.28	1.29	1.29

T1, T2, T3 stripe image edge 10lp / mm resolution test results shown in Figure 5, three stripe image can see the light and dark resolution pattern, T2 stripes are the clearest, followed by T1 stripes and T3 stripes, by light and dark The gray value of the pattern calculates the contrast of the image.

T1 stripe light and dark stripe maximum I _max 10547.33, minimum I _min 8619.47, background intensity 1921.6, so the contrast is C:

The same method can be used to obtain T2 stripes and T3 stripes with contrast ratios of 0.29 and 0.06, and 10 lp/mm resolution image contrast data as shown in Table 3.

Table 3 spatial resolution image contrast

It can be seen that the contrast of the T2 stripe image at the center is up to 0.29, the contrast of the T1 stripe and the T3 stripe image is less than T2, and still exceeds the discriminant criterion of 0.05. The spatial resolution of the detection system is 10 lp/mm. The result proves that the X-ray stripe camera photocathode 201 rapid detection system detects three photocathodes 201 at the same time, and the three stripe images are evenly distributed, and the spatial resolution reaches 10 lp/mm.

By implementing the present invention, by adjusting the voltage, structure and relative position of the trinity stripe image tube group, the three slits are simultaneously imaged in a central area detectable by the CCD camera, and the X-ray stripe camera photocathode is simultaneously and quickly detected.

The above embodiments are merely illustrative of the technical concept and the features of the present invention. The purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention without limiting the scope of the present invention. Equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the appended claims.

Claims (10)

1. An X-ray stripe camera photocathode rapid detection system, comprising: a light source (10), a trinity stripe image tube set, a CCD camera (302), and a computer (40), wherein

   The light source (10) is disposed on an incident end side of the trinity stripe image tube group, and a test light signal emitted by the light source (10) is incident on an incident end of the trinity stripe image tube group;

   The trinity stripe image tube assembly includes a first stripe image tube (T1), a second stripe image tube (T2), and a third stripe image tube (T3);

   The CCD camera (302) is disposed at an exit end of the trinity stripe image tube set for collecting a test image of an exit end of the trinity stripe image tube group;

   The CCD camera (302) is coupled to the computer (40) for processing the test image.
2. The X-ray stripe camera photocathode rapid detection system according to claim 1, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube ( T3) arranged side by side, the incident ends of the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube (T3) are located on the same side for receiving the test Optical signal

   The light source (10) is an X-ray source or an ultraviolet light source.
3. The X-ray stripe camera photocathode rapid detection system according to claim 1 or 2, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image The structure of the tube (T3) is the same;

   The first stripe image tube (T1) includes a photocathode (201), a grid (M), a focusing electrode (F), an anode (A), and a deflecting plate (DP), wherein the photocathode (201) a detachably mounted on an incident end of the first fringe tube (T1) for converting a light pulse into an electron pulse, the photocathode (201) and the grid (M) Parallel; the focusing electrode (F) is located in a flight path of the first fringe tube (T1) and is axially symmetrically distributed; the anode (A) is located in a flight path of the first fringe tube (T1) And the axis is symmetrically distributed; the deflector plate (DP) is located on both sides of the exit end of the first fringe tube (T1) and is symmetrically distributed.
4. The X-ray stripe camera photocathode rapid detection system according to claim 1, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube ( T3) is located in the vacuum chamber (20);

   The vacuum chamber (20) is disposed near the incident end side of the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube (T3) for the test. The test light signal input window (203) into which the optical signal enters.
5. The X-ray stripe camera photocathode rapid detection system according to claim 4, wherein the vacuum chamber (20) has an openable cathode replacement window (202), and the cathode replacement window (202) The opening position corresponds to an incident end of the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube (T3), and the cathode replacement window (202) is open Replacement of the photocathode (201) provides an operating space.
6. The X-ray stripe camera photocathode rapid detection system according to claim 4, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube ( The exit end of T3) is provided with a phosphor screen (301) for receiving the electron beam emitted from the exit end and emitting light, and the phosphor screen (301) is the first stripe image tube (T1) and the second stripe image tube (T2). The third stripe image tube (T3) shares a fluorescent screen (301);

   The CCD camera (302) is disposed on one side of the phosphor screen (301) for collecting a test image on the screen.
7. The X-ray stripe camera photocathode rapid detection system according to claim 4, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube ( T3) is fixed by an upper plate and a lower plate which are fixed to the inner wall of the vacuum chamber (20).
8. The X-ray stripe camera photocathode rapid detection system according to claim 4, wherein the vacuum chamber (20) further comprises a vacuum gauge (205) for measuring the degree of vacuum in the vacuum chamber (20);

   The vacuum chamber (20) is connected to a vacuum pump (206) for changing the degree of vacuum in the vacuum chamber (20).
9. The X-ray stripe camera photocathode rapid detection system according to claim 1, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube ( T3) respectively connected to the power supply;

   The first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube (T3) are grounded through a common ground electrode.
10. The X-ray stripe camera photocathode rapid detection system according to claim 9, wherein the first stripe image tube (T1), the second stripe image tube (T2), and the third stripe image tube ( T3) respectively connected to the power supply through the high voltage input flange (503);

    The power supply includes a high voltage power supply (501) and a voltage divider (502). The high voltage power supply (501) is respectively connected to the first stripe image tube (T1) and the second through the voltage divider (502). Stripe image tube (T2), third stripe image tube (T3).

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