CN-122017929-A - Large beam current monitoring device capable of being used under vacuum and high-low temperature conditions

CN122017929ACN 122017929 ACN122017929 ACN 122017929ACN-122017929-A

Abstract

The invention relates to a large beam monitoring device capable of being used under vacuum and high and low temperature conditions, which comprises a spherical vacuum chamber, wherein a beam outlet of an electron accelerator is connected with the spherical vacuum chamber, a collector is arranged in the spherical vacuum chamber, positive high voltage is applied to the collector, the outer wall of the spherical vacuum chamber is grounded, the electron beam of the accelerator can drift towards the collector and form a current signal, the collector is connected with an electrometer outside the spherical vacuum chamber through a cable interface, and the spherical vacuum chamber is also provided with a temperature regulating device. The invention eliminates the influence of geometric asymmetry on electric field distribution through spherical symmetry design, improves measurement uniformity under large irradiation area, adopts a titanium alloy shell and a multi-layer vacuum sealing structure, ensures long-term stability under extreme temperature and high vacuum conditions, and provides a high-reliability monitoring tool for spacecraft anti-radiation test.

Inventors

GAO FEI
WANG FEIFEI
DING YUYANG
CHEN JIAHANG
WANG ZILIN
LIU JIARUI
NI NING

Assignees

中国原子能科学研究院

Dates

Publication Date: 20260512
Application Date: 20260104

Claims (12)

1. The utility model provides a can be at large-scale beam current monitoring devices that vacuum and high low temperature used under the condition, its characterized in that includes spherical vacuum chamber (1), electron accelerator (2) beam outlet and spherical vacuum chamber (1) are connected, are equipped with collector (3) in spherical vacuum chamber (1), exert positive high pressure on collector (3), spherical vacuum chamber (1) outer wall ground connection, and accelerator electron beam can drift to the collector and form the current signal, collector (3) are connected with outer electrometer (7) of spherical vacuum chamber through cable interface (6), and spherical vacuum chamber (1) still is equipped with temperature regulating device.
2. Large beam monitoring device according to claim 1, characterized in that the collector (3) is a multi-channel collector and the electrometer (7) is a multi-channel electrometer.
3. The large beam monitoring device according to claim 1, wherein the collector (3) comprises a base (32) and a plurality of metal detection units (31), the metal detection units (31) are uniformly arranged on the base (32), and an etched circuit board is embedded in the base (32) for applying voltage to the metal detection units (31) and transmitting signals.
4. A large beam monitoring device capable of being used under vacuum and high and low temperature conditions according to claim 3, wherein each metal detection unit (31) of the collector transmits a current signal to a multichannel electrometer (7) outside the spherical vacuum chamber through a cable, and the multichannel electrometer (7) acquires the number and the signal of each metal detection unit (31) to realize the function of monitoring electron beam fluctuation.
5. A large beam monitoring device according to claim 3, wherein the base (32) of the collector is made of PMMA and the metal detection unit (31) is made of copper.
6. The large beam monitoring device according to claim 1, wherein the collector (3) is located opposite to the beam outlet of the electron accelerator (2), and an adjustable shielding layer is arranged between the collector and the beam outlet of the electron accelerator.
7. Large beam monitoring device according to claim 1, which can be used in vacuum and at high and low temperatures, characterized in that the spherical vacuum chamber (1) is provided with a vacuum valve (5), the vacuum valve (5) being connected with a vacuum pump via a gas pipe.
8. The large beam monitoring device capable of being used under vacuum and high and low temperature conditions according to claim 1, wherein the temperature adjusting device comprises a metal heat conducting plate (4) closely attached below a collector, a metal pipeline is arranged on the metal heat conducting plate (4), working liquid is filled in the metal pipeline, and the high and low temperature environment in the spherical vacuum cabin is realized by adjusting the temperature of the working liquid.
9. The large beam monitoring apparatus of claim 8, wherein the metal pipe passes through the spherical vacuum chamber and is connected to an external temperature control device.
10. Large beam monitoring device according to claim 1, which can be used in vacuum and at high and low temperatures, characterized in that the outer shell of the spherical vacuum chamber (1) is made of titanium alloy or nickel-iron alloy.
11. The large beam monitoring device capable of being used under vacuum and high and low temperature conditions according to claim 1, wherein the cable connector (6) adopts full metal sealing treatment, a metal sealing flange matched with the material of a spherical vacuum chamber shell is used as a mounting reference, a metal sealing gasket is used for fastening and sealing with a chamber body, a ceramic insulator matched with the thermal expansion coefficient is embedded in a flange through hole, a metal electrode is sleeved on the ceramic insulator, two ends of the metal electrode are respectively connected with an indoor outer cable and equipment of the chamber, and a permanent seal is formed between the ceramic insulator and the metal material through brazing.
12. The large beam monitoring device capable of being used under vacuum and high and low temperature conditions according to claim 1, wherein a metal corrugated pipe and fluororubber compound sealing technology is adopted at the opening/closing/splicing sealing position of the spherical vacuum chamber (1), the metal corrugated pipe provides axial or radial deformation compensation, the installation deviation and the temperature deformation of a curved surface are adapted, and fluororubber is used as a main sealing piece to cling to a sealing surface to block gas leakage.

Description

Large beam current monitoring device capable of being used under vacuum and high-low temperature conditions Technical Field The invention relates to a beam monitoring technology, in particular to a large beam monitoring device which can be used under vacuum and high and low temperature conditions. Background Currently, in ground simulation experiments of spatial radiation effect, dose measurement generally adopts ionization chamber technology as a core method. The ionization chamber converts the charge amount into a dose rate or a total dose value by collecting ionized charges generated by high-energy electron beams or radiation particles in the gas, thereby realizing accurate measurement. The traditional ionization chamber mostly adopts a cylindrical or flat plate structure, and utilizes electric field distribution to guide ionized charges to a collector, but has obvious defects in extreme environments (such as a temperature range of-100 ℃ to +150 ℃ and a high vacuum condition of 10 -5Pa~10-7 Pa), such as uneven electric field distribution in a marginal area with a large irradiation area caused by geometrical asymmetry, insufficient measurement uniformity, poor material thermal stability, easy initiation of electrode spacing deformation, possibility of signal drift or gas leakage caused by insufficient sealing performance, and difficulty in meeting the accurate monitoring requirements of large-size samples such as satellite parts. The material of the existing ionization chamber has poor thermal stability, is easy to cause electrode spacing deformation due to material shrinkage in a low-temperature environment, and has insufficient sealing performance, so that gas leakage or signal drift can be caused, and long-term reliability is affected. Disclosure of Invention The invention aims to solve the problems in the prior art and provides a large beam monitoring device which can be used under vacuum and high and low temperature conditions so as to solve the defects of the traditional ionization chamber in uniformity, environmental adaptability and parameter compatibility. In order to achieve the above purpose, the embodiment of the invention provides a large beam monitoring device which can be used under vacuum and high-low temperature conditions, comprising a spherical vacuum chamber, an electron accelerator beam outlet is connected with the spherical vacuum chamber, a collector is arranged in the spherical vacuum chamber, positive high voltage is applied to the collector, the outer wall of the spherical vacuum chamber is grounded, an accelerator electron beam can drift towards the collector and form a current signal, the collector is connected with an electrometer outside the spherical vacuum chamber through a cable interface, and the spherical vacuum chamber is also provided with a temperature regulating device. Further, in a specific embodiment, the large beam monitoring device can be used under vacuum and high and low temperature conditions as described above, wherein the collector is a multi-channel collector, and the electrometer is a multi-channel electrometer. Further, in a specific embodiment, the large beam monitoring device capable of being used under vacuum and high and low temperature conditions as described above, wherein the collector is composed of a base and a plurality of metal detection units, the plurality of metal detection units are uniformly arranged on the base, and an etching circuit board is embedded in the base and is used for applying voltage to the metal detection units and transmitting signals. Furthermore, each metal detection unit of the collector transmits a current signal to a multichannel electrometer outside the spherical vacuum cabin through a cable, and the multichannel electrometer acquires the number and the signal of each metal detection unit, so that the monitoring function of electron beam fluctuation is realized. Furthermore, the base is made of PMMA material, and the metal detection unit is made of copper material. Further, in a specific embodiment, the large beam monitoring device can be used under vacuum and high and low temperature conditions as described above, wherein the collector is located opposite to the beam outlet of the electron accelerator, and an adjustable shielding layer is disposed between the collector and the beam outlet of the electron accelerator. Further, in a specific embodiment, the large beam monitoring device which can be used under vacuum and high and low temperature conditions as described above, wherein the spherical vacuum chamber is provided with a vacuum valve, and the vacuum valve is connected with a vacuum pump through a gas pipeline. Further, in a specific embodiment, the large beam monitoring device capable of being used under vacuum and high and low temperature conditions as described above, wherein the temperature adjusting device comprises a metal heat conducting plate closely attached below the collector, a metal pipeline is ar