摘要：
Heating of ions by two Alfven waves propagating along an external magnetic field via nonresonant wave-particle interaction in low-beta plasmas is studied using test-particle simulation. Due to subcyclotron ion resonance, the heating effect of the left-hand polarized Alfven wave pair is 10% greater than that of the right-hand polarized pair. The results show that the perpendicular and parallel (to the external magnetic field) temperatures, as well as the parallel fluid velocity, vary sinusoidally with the phase difference. Furthermore, the magnitude of the oscillations decreases with the ratio of the frequencies of the two waves. When the frequency ratio reaches above 2, the effect of the phase difference vanishes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737896]
作者机构：
[杜丹] Department of Mathematics and Physics, University of South China, Hengyang, China;[曹锦佳; 王振华; 龚学余; 扬文超; 郑平卫] Department of Nuclear Science and Technology, University of South China, Hengyang, China
通讯机构：
Department of Mathematics and Physics, University of South China, China
作者：
Yu, Jun*;Dong, J. Q.;Li, X. X.;Du, D.;Gong, X. Y.
期刊：
Journal of Plasma Physics,2012年78(6):651-655 ISSN：0022-3778
通讯作者：
Yu, Jun
作者机构：
[Du, D.; Yu, Jun] Univ S China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Dong, J. Q.] Zhejiang Univ, Inst Fus Theory & Simulat, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China.;[Dong, J. Q.] SW Inst Phys, Chengdu, Peoples R China.;[Li, X. X.; Gong, X. Y.] Univ S China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Yu, Jun] U;Univ S China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
摘要：
Excitation of the geodesic acoustic mode continuum by drift wave turbulence is studied using the wave kinetic approach. For a model profile of weak non-uniform ion temperature, the forms of growth rate and radial structure of geodesic acoustic modes are obtained analytically. The growth rate is analyzed for several conditions for present-day tokamaks and compared with that for uniform ion temperature, as well as that given by the coherent mode approach for non-uniform ion temperature.
作者：
Du, Dan*;Gong, Xueyu;Wang, Zhenhua;Yu, Jun;Zheng, Pingwei
期刊：
Journal of Plasma Physics,2012年78(6):595-599 ISSN：0022-3778
通讯作者：
Du, Dan
作者机构：
[Du, Dan; Yu, Jun] Univ S China, Dept Math & Phys, Hengyang City, Hunan, Peoples R China.;[Wang, Zhenhua; Gong, Xueyu] Univ S China, Dept Nucl Sci & Technol, Hengyang City, Hunan, Peoples R China.;[Zheng, Pingwei] Univ S China, Dept Environm Protect & Safety Engn, Hengyang City, Hunan, Peoples R China.
通讯机构：
[Du, Dan] U;Univ S China, Dept Math & Phys, Hengyang City, Hunan, Peoples R China.
摘要：
A well-optimized design of an ion cyclotron resonance heating (ICRH) antenna is very important for steady-state plasma heating with high radio frequency (RF) power of several tens of megawatts. However, a sharp decrease in the coupling RF power because of impedance mismatch of ICRH system is an issue that must be resolved for present-day fusion reactors and International Thermonuclear Experimental Reactor. This paper has theoretically analyzed the ICRH antenna's impedance matching for ELMy plasmas on experimental advanced superconducting tokamak (EAST) by the transmission line theory. The results indicate that judicious choice of the optimal feeder location is found useful for adjustable capacitors' tolerance to the variations of the antenna input impedance during edge-localized mode (ELM) discharge, which is expected to be good for the design of ICRH antenna system and for real-time feedback control during ELM discharge on EAST.
作者机构：
[Ning, Yan-Tao; Peng, Zhi-Hua; Guo, Yan-Chun; Gong, Xue-Yu; Peng, Yan-Feng] Univ S China, Sch Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[Peng, Zhi-Hua] U;Univ S China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
carbon nanotubes;hydrogen plasma;static magnetic field;microwave absorption
摘要：
We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton-Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction on the microwave absorption of hydrogen plasma in CNTs are studied in detail. The numerical results indicate that the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes can be obviously improved when the exter- nal static magnetic field is applied to the material. It is found that the specified frequency microwave can be strongly absorbed by the hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes over a wide range of incidence angles by adjusting the external magnetic field intensity and the parameters of the hydrogen plasma.
作者机构：
[刘燕; 尹岚; 彭晓炜; 杨磊; 龚学余] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[彭晓炜] Department of Engineering Physics, Tsinghua University, Beijing 100084, China;[刘燕; 杨磊] School of Opto-Electronic Information Science and Technology, Yantai University, Yantai 264005, China
通讯机构：
School of Nuclear Science and Technology, University of South China, China
