CdTe探测器对EAST托卡马克中20–200keV硬X射线测量

Measurement 20–200 keV hard X-ray based on CdTe detector in EAST Tokamak

介绍了EAST托卡马克装置硬X射线诊断系统。该系统由探测器阵列和电子线路组成,探测器采用水平七道的碲化镉(CdTe)探测器阵列。在EAST托卡马克装置上建立了一套较完善的硬X射线能谱诊断系统,用来测量等离子体在硬X射线辐射能段(20–200 keV)的能谱。实验结果表明,该系统能满足测量相应能量范围的等离子体硬X射线轫致辐射要求。文中给出了碲化镉探测器的标定结果及典型的放电结果。

Background： Accurate and quantitative measurement of plasma radiation is a key issue to Tokamak, toroidal magnetic confinement device. The radiations from Tokamak cover large energy range. Driven by the determination of the obtaining of hard X-ray spectra, a new system based on a high performance CdTe detector was built up in EAST Tokamak, the first non-circle cross-section in the world. Purpose： Introduces the device of hard X-ray diagnosis system in the EAST Tokamak on the Port A. The system can measure the plasma hard X-ray （20--200 keV） spectra under different discharge conditions, including Ohmical shot and Lower Hybrid Current Drive （LHCD） shot. The research of high speed electron which produced by LHCD is also the aim of the new system. Methods： A high performance CdTe detector was using in EAST Tokamak to measure the hard X-ray （20-200 keV） spectra. Results： The results show that the new system based on a high performance CdTe can meet the requirements for measuring the EAST Tokamk. Conclusions： A preliminary experimental result showed that the system can meet the requirements for measuring the X-ray bremsstrahlung of plasma in the energy range from 20 to 200 keV. Calibration result and typical measurement result on EAST are present in this paper.