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Energy spectrum of multi-radiation of x-rays in a low energy Mather-type plasma focus device

Chinese Physics B 2014年第6期23卷 375-380页

作者： Farzin M.Aghamir Reza A.Behbahani Department of Physics University of Tehran

The multi-radiation of x-rays was investigated with special attention to their energy spectrum in a Mather-type plasma focus device （operated with argon gas）. The analysis is based on the effect of anomalous resistances. To study the energy spectrum, a four-channel diode x-ray spectrometer was used along with a special set of filters. The filters were suitable for detection of medium range x-rays as well as hard x-rays with energy exceeding 30 keV. The results indicate that the anomalous resistivity effect during the post pinch phase may cause multi-radiation of x-rays with a total duration of 300 ± 50 ns. The significant contribution of Cu-Kα was due to the medium range x-rays, nonetheless, hard x-rays with energies greater than 15 keV also participate in the process. The total emitted x-ray energy in the forms of Cu-K and Cu-K/3 was around 0.14 ± 0.02 （J/Sr） and 0.04 ±0.01 （J/Sr）, respectively. The total energy of the emitted hard x-ray （〉 15 keV） was around 0.12± 0.02 （J/Sr）.

关键词： Mather-type plasma focus device hard x-rays multi-radiation tube multiple voltage peaks,anomalous resistances

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Photon Temperatures of hard x-Ray Emission of LHCD Plasmas in HT-7 Tokamak

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Plasma Science and Technology 2008年第5期10卷 529-534页

作者： Jawad YOUNIS 万宝年陈忠勇林士耀石跃江单家方刘甫坤 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Department of Physics Yunnan Normal UniversityKunming 650092China

A detailed study of photon temperatures （Tph） of hard x-ray emission in lower hybrid current drive （LHCD） plasmas is presented. The photon temperature increases with the increase in plasma current and decreases with the increase in plasma density. In lower hybrid power and phase scanning experiments; there is no appreciable change in the photon temperature. The numerical results based on ray-tracing calculation and Fokker-Planck solver gives reasonable explanation for the experimental observation. Both experimental and numerical results reveal that the photon temperature depends mainly on global effects of the fast electron population, synergy between the fast electron and the loop voltage and the Coulomb slowing down.

关键词： LHCD photon temperature hard x-rays

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