Processing method and device for multi-channel energy spectrum measurement

Abstract

The invention belongs to the field of plasma diagnosis computer processing, in particular to a processing method and device for multi-channel energy spectrum measurement. The processing method includes the following steps: collecting a pulse signal sent by a probe and converting it into a digital pulse signal; counting and classifying the digitized pulse signal to obtain a count spectrum; converting the count spectrum into an energy spectrum; The energy attenuation produced by the beryllium foil is reduced, and the energy spectrum obtained in the third step is restored; the energy spectrum after reduction is smoothed and peaked and fitted to obtain the electron temperature. The processing device includes a pulse signal generation module, a high-speed acquisition card, an analog/digital signal conversion module, a high-speed cache module, and a processor unit with an energy counting module and a temperature calculation module. The problems of common multi-channel energy spectrum measurement and processing methods, such as high hardware cost, strong equipment specificity, limited number of energy channels, low spatial and temporal resolution, and inability to save original signals, are solved.

Description

technical field [0001] The invention belongs to the field of plasma diagnosis computer processing, and in particular relates to a processing method and device for multi-channel energy spectrum measurement. Background technique [0002] In Tokamak devices and other magnetic confinement nuclear fusion devices, the pulse height analysis system is usually used to measure the energy spectrum of soft X-ray radiation, so as to obtain some important plasma information, such as electron temperature, electron velocity distribution, and heavy metal impurity content and other information. At present, in the energy spectrum measurement of nuclear electronics, hardware methods such as analog-to-digital converters (ADC) are traditionally used for pulse height analysis, such as linear discharge ADC (Wilkinson type), but due to the limitation of conversion time, they cannot be used for High count rate energy spectrum measurement, and there are large noise, low count rate, serious accumulati...

AI Technical Summary

Problems solved by technology

For example, directly purchase the products of instrument system manufacturers, such as CABENRRA, ORTEC, CAEN and FAST ComTec. The electronic part used in this special multi-channel amplitude analyzer energy spectrometer includes preamplifier, main amplifier, detector, high voltage Power supply, timing single channel, linear gate and stretcher, etc., although the module has a high level of performance, the disadvantages are strong specificity, high price, and limited maintenance

[0004] In summary, using hardware for multi-channel energy spectrum measurement, since the hardware detector measurement will be affected by electromagnetic interference and non-plasma X-ray and γ-ray radiation as well as neutron radiation during the actual plasma discharge process, so The accumulation and interference phenomena caused by the hardware cannot be completely removed, and the purchase and maintenance costs of the multichannel instrument dedicated to the hardware equipment are high; at the same time, the special processing method that comes with the equipment cannot save the original signal, so that the time resolution cannot be adjusted flexibly after the discharge is completed. rate and energy traces for further physical diagnostic analysis

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