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1.
A detailed analysis of the synchrotron radiation intensity and energy of runaway electrons is presented for the Experimental Advanced Superconducting Tokamak(EAST). In order to make the energy of the calculated runaway electrons more accurate, we take the Shafranov shift into account. The results of the analysis show that the synchrotron radiation intensity and energy of runaway electrons did not reach the maximum at the same time. The energy of the runaway electrons reached the maximum first, and then the synchrotron radiation intensity of the runaway electrons reached the maximum.We also analyze the runaway electrons density, and find that the density of runaway electrons continuously increased. For this reason, although the energy of the runaway electrons dropped but the synchrotron radiation intensity of the runaway electrons would continue rising for a while. 相似文献
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We have calculated the spectrum and polarization of the bremsstrahlung hard X-ray radiation produced by nonrelativistic electrons
that are accelerated during a solar flare. The distribution function of accelerated electrons is taken from the self-consistent
solution of the kinetic equation allowing for Coulomb collisions and an electric field of reverse current in plasma. The computed
polarization of the hard X-ray polarization is shown to be appreciably lower than the value given by simplified thick-target
models without considering the reverse current. 相似文献
3.
高能电子束轰击金属靶会产生韧致辐射X射线,为优化韧致辐射X射线品质,需要研究如何获取最佳辐射效率等韧致辐射规律.结合理论分析,并采用MCNP/4C对10,20?MeV电子的韧致辐射规律进行了模拟研究.讨论了不同靶材料产生的韧致辐射效率、角分布、能谱分布、准直锥孔内辐射效率等问题.通过对不同靶材料韧致辐射的模拟研究,给出了不同厚度靶与光子效率、注量分布、出射电子与角分布的关系与规律.由此得到不同靶材料对于10,20?MeV电子在最优韧致辐射效率下的一些边界条件与规律.
关键词:
韧致辐射
最佳效率
角分布
能谱 相似文献
4.
通过红外可见内窥镜诊断系统对EAST 等离子体芯部逃逸电子的同步辐射功率谱进行了分析,得出低能段逃逸电子同步辐射主要在红外波段,随着逃逸电子能量的增加,同步辐射向短波方向移动进入可见光波段。在欧姆放电条件下,对逃逸电子同步辐射所产生的的红外可见光进行了成像分析,同时研究了EAST 等离子体在低杂波和中性束注入加热条件下的逃逸电子行为。实验结果显示,低杂波和NBI 的投入总体抑制电子的逃逸,但低杂波投入初期产生的快电子对逃逸电子的产生具有促进作用。 相似文献
5.
通过红外可见内窥镜诊断系统对EAST等离子体芯部逃逸电子的同步辐射功率谱进行了分析,得出低能段逃逸电子同步辐射主要在红外波段,随着逃逸电子能量的增加,同步辐射向短波方向移动进入可见光波段。在欧姆放电条件下,对逃逸电子同步辐射所产生的的红外可见光进行了成像分析,同时研究了EAST等离子体在低杂波和中性束注入加热条件下的逃逸电子行为。实验结果显示,低杂波和 NBI 的投入总体抑制电子的逃逸,但低杂波投入初期产生的快电子对逃逸电子的产生具有促进作用。 相似文献
6.
D.E. Roberts 《Journal of Quantitative Spectroscopy & Radiative Transfer》1981,26(3):259-272
The results of calculations of the ionisation equilibria and radiative cooling of Tokamak impurities are given as a function of electron temperature. In the relevant rate coefficients, the Maxwellian distribution of electron energies has been assumed to be distorted by a runaway tail caused by the finite electric field in a Tokamak. In order to investigate the effect of runaways on the start-up phase of a Tokamak, non-steady-state calculations have also been performed. 相似文献
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S. A. Voronov A. M. Gal'per V. V. Dmitrenko V. G. Kirillov-Ugryumov 《Russian Physics Journal》1986,29(9):719-723
Special experiments performed aboard the space stations Salyut-6-SoyuzProgress, Salyut-7-Soyuz T-13-Kosmos-1669, and the artificial earth satellite IK Bolgariya-1300 discovered, significant electron and positron fluxes with energies of more than decades of MeV in the earth's radiation belts. Spatial and angular characteristics of these fluxes have been studied. Study of the charge ratio of the electron-positron component has shown that it is electron-based. This indicates that in outer space near the earth some efficient mechanism capable of accelerating electrons to energies of more than decades of MeV exists.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 38–43, September, 1986.The authors consider it their pleasant duty to express gratitude to V. M. Gracev, S. V. Koldashov, A. V. Popov, and S. E. Ulin for their preparation of the equipment and conduct of the experiments. 相似文献
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Yu. P. Kunashenko 《Russian Physics Journal》1988,31(2):132-136
The coherent bremssstrahlung (CB) of relativistic electrons in antiferromagnetic crystals is studied theoretically. It is shown that the internal magnetic field of an antiferromagnet has a negligible effect on CB. The complete CB spectrum is calculated for hematite, -Fe2O3.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 57–61, February, 1988. 相似文献
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《Physics letters. A》2006,351(6):413-416
The energy limit of runaway electrons in the HT-7 tokamak is investigated by measuring the synchrotron radiation originated from the runaway electrons and the hard X-ray radiation (HXR) when they hit the first wall. An upper boundary on the runaway energy can appear due to the resonance between the electron gyromotion and the magnetic field ripple in the low field side. The experimental derived maximum energy in the core is about 26 MeV, and maximum energy in the edge region is blocked to no more than 5 MeV. This resonance interaction of runaways with the nth harmonic of the magnetic field ripple can account for the observed energy gap of the runaways. 相似文献
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O. A. Gorbunova P.N. Zhukova N. N. Nasonov 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(11):1604-1607
We discuss the possibility of using an anomalous peak of polarization bremsstrahlung radiation from relativistic electrons
for the diagnostics of polycrystalline materials. 相似文献
15.
Z. S. Kachlishvili F. G. Chumburidze 《Journal of Experimental and Theoretical Physics》1998,86(2):380-382
This paper discusses the transverse runaway effect in the electron-temperature approximation. The combinations of scattering
mechanisms and the corresponding threshold electric fields for which transverse runaway develops are determined. It is shown
that the transverse-runaway effect is not associated with any approximation.
Zh. éksp. Teor. Fiz. 113, 688–692 (February 1998) 相似文献
16.
Differential conductivity under the transverse runaway of hot electrons is investigated. Quasi-elastic scattering and electronic-temperature approximations are considered for equilibrium and heated phonon subsystem. In both approximations, the differential conductivity is shown to tend to infinity, keeping the sign. Phonon heating retards transverse runaway. 相似文献
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V. A. Astapenko A. S. Kubankin N. N. Nasonov V. V. Polyanskiĭ G. P. Pokhil V. I. Sergienko V. A. Khablo 《JETP Letters》2006,84(6):281-284
The spectra of the collimated polarization bremsstrahlung of 7-MeV electrons intersecting Al, Cu, and Ni polycrystalline films have been measured. Detailed quantitative comparison of the experimental data with theoretical predictions has been performed. It has been shown that the model of a polycrystal as an ensemble of randomly oriented single crystals adequately describes the experimental results. This makes it possible to expect the development of a new method of diagnostics of the atomic structure of partially ordered solids. 相似文献
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It has been shown that the classical Bethe-Heitler result can be inapplicable for describing the bremsstrahlung spectrum of relativistic electrons in real solid targets. 相似文献