Current feedback protection method and system for electron multiplier
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An electron multiplier tube and current feedback technology, which is applied in the field of plasma diagnosis, can solve the problems of affecting the service life, the electron multiplier tube is easily damaged, and the anode current of the electron multiplier tube is too large, so as to reduce the anode current and improve the system reliability. Effect
Active Publication Date: 2022-03-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology
[0004] The problem solved by the technology of the present invention is aimed at the risks existing in the electron multiplier tube part during the operation of the existing LENPA, that is, under the long-pulse high-power operating conditions of the tokamak device, the excessive current of the electron multiplier tube anode may affect the service life, and The problem that the electron multiplier tube is easily damaged when the plasma ruptures and the density feedback feeding system fails, provides a current feedback protection method and system for the electron multiplier tube, which has the advantages of economy, simplicity and reliability, and realizes the protection of the electron multiplier tube
Method used
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Embodiment 1
[0039] First of all, when the plasma discharge experiment is about to start, the PLC can be actively controlled by the computer 7 to generate a PLC control signal, so that the state of the control module becomes normal, that is, the area of the circular disc 11 with holes is S by rotating the motor 9. em The circular hole is located directly in front of the electron multiplier tube 1;
[0040] like figure 2 As shown, the high-voltage pole, signal pole, and ground pole of the electron multiplier tube are connected to the high-voltage power supply 3, the preamplifier 4, and the diagnostic ground terminal 5 respectively through the electrode flange 2;
[0041] After the plasma discharge experiment started, such as figure 2 As shown, the neutral particles enter the electron multiplier tube 1 after passing through the circular disc 11 with a hole, and are converted into secondary electrons. After the secondary electrons are multiplied, the anode current signal is formed, and f...
Embodiment 2
[0049] Based on the current feedback protection method in the specific implementation, this embodiment 2 provides a current feedback protection system for electron multiplier tubes, including:
[0050] The sampling module is used for receiving, converting, amplifying and collecting the anode current signal;
[0051] The control module is used to compare the anode current signal of the electron multiplier tube 1 with the rated safety current threshold of the electron multiplier tube 1, control the output of the PLC8, and generate a PLC control signal. The computer 7 receives the voltage signal output by the data acquisition card 6, and divides it by the current conversion factor of the preamplifier 4, converts back to the anode current signal of the electron multiplier tube 1, and calculates the anode current signal and the rated safe current of the electron multiplier tube 1 The ratio of the threshold value is output to PLC8, and PLC8 generates a PLC control signal according t...
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Abstract
The invention relates to a current feedback protection method and system for an electron multiplier, and the method comprises the steps: receiving, converting, amplifying and collecting an anode current signal of the electron multiplier, comparing the anode current signal with a rated safety current threshold value so as to control the output of a programmable logic controller (PLC), and generating a PLC control signal which is used for controlling a motor to rotate a circular disc with a hole, and circular holes with different areas are uniformly distributed in the disc in the circumferential direction to adjust the particle receiving area. The system comprises a sampling module, a control module and an adjusting module. The sampling module comprises a pre-amplifier and a data acquisition card; the control module comprises a computer and a PLC. The adjusting module comprises a motor and a circular disc with a hole. According to the invention, the anode current of the electron multiplier is detected, and the particle receiving area is changed in real time by using the thought of feedback control so as to control the flux of incident particles, so that the anode current is adjusted, and the electron multiplier is protected from being damaged under the condition that current approaching a safety threshold and overload current appear.
Description
technical field [0001] The invention belongs to the technical field of high-temperature plasma diagnosis, and in particular relates to a current feedback protection method and system for an electron multiplier tube. Background technique [0002] The most common device used to diagnose neutral particles in a tokamak fusion device is a neutral particle analyzer. The working principle is to first ionize the neutral particles, and then apply an electromagnetic field to deflect the ions and analyze their energy. However, this method is only suitable for measuring particles with energies on the order of keV, and the energy of neutral particles produced in the plasma boundary region is generally not so high, so it is necessary to use a low energy neutral particle analyzer (Low Energy Neutral ParticleAnalyzer , LENPA), can accurately measure neutral particles with energy lower than 300eV. The basic principle of time-of-flight analysis is to measure the flight time of particles in a ...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): H01J37/32
CPCH01J37/32935H01J2237/2444Y02E30/10
Inventor 穆磊丁锐刘牛先彭姣鄢容张渝陈俊凌
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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