Hard X-ray flux detection system of J-TEXT Tokamak device

Abstract

The invention discloses a hard X-ray flux detection system of a J-TEXT Tokamak device. The hard X-ray flux detection system comprises a hard X-ray detection module, a detection circuit and an AD data acquisition module; the J-TEXT Tokamak device generates a large number of high-speed escape electrons when disruption is operated; the high-speed escape electrons bombard the material of the first wall of the device so as to directly damage the material; great importance should be attached to the density monitoring of the escape electrons; when the escape electrons damage the first wall, thick target bremsstrahlung occurs between the escape electrons and the material, and hard X-rays are generated, and the energy of the hard X-rays can be up to 0.5 to 10MeV; the more escape electrons strike the wall of the device, the higher the energy of the generated hard X-rays is, and the higher pulse voltage outputted by the detector is; hard X-ray optical signals are converted to pulse voltage signals through the hard X-ray detection module; the peak signals of the pulse signals are detected by the detection circuit; the peak signals are transmitted to a computer terminal through the data acquisition card; the computer terminal stores the peak signals; radiation intensity can be determined; and since the radiation intensity is proportional to the amplitude of the pulse signals, the distribution condition of the escape electrons can be obtained.

Description

technical field [0001] The invention belongs to the technical field of tokamak device detection, and more specifically relates to a hard X-ray flux detection system of a J-TEXT tokamak device. Background technique [0002] Electron escape is a common phenomenon in tokamak plasma; as the electrons are accelerated by the electric field force, when the impact damping of the hot electrons is less than the electric field force, the hot electrons will be converted into escaped electrons. Plasma breakup or low-density discharges will bring about a high flux of escaped electrons. Since the escaped electron energy is as high as hundreds of MeV, when the plasma breaks, the first wall material of the device will be lost locally, which will directly damage the performance and life of the material. Therefore, the escaped electron energy and flux must be monitored. When the escaped electrons are lost to the first wall, thick-target bremsstrahlung occurs with the material, producing high-...

AI Technical Summary

Problems solved by technology

[0003] Existing fusion reaction devices such as EAST and HL-2A all use multi-channel tangential FEB array hard X-ray measurement systems to measure high-energy fast electron radiation, and their detection electronic systems are complex and costly

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