Ponderomotive Barrier as a Maxwell Demon.

Dodin, I. Y. ; Fisch, N. J. ; Rax, J. M.

Technical Information Center Oak Ridge Tennessee

关键词: Plasma dynamics;    Magnetic fields;    Direct current;    Transverse heating;    Accelerators;   

RP-ID  :  DE2004827931

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The possibility of efficient ponderomotive current drive in a magnetized plasma was reported recently in (Phys. Rev. Lett. 91, 205004 (2003)). Precise limitations on the efficiency are now given through a comprehensive analytical and numerical study of single-particle dynamics under the action of a cyclotron-resonant rf drive in various field configurations. Expressions for the particle energy gain and acceleration along the dc magnetic field are obtained. The fundamental correlation between the two effects is described. A second fundamental quantity, namely, the ratio of the potential barrier to the energy gain, can be changed by altering the field configuration. The asymmetric ponderomotive current drive effect can be optimized by minimizing the transverse heating.