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Thermionic Cooling of the Target Plasma to a Sub-eV Temperature
被引:23
作者:

Campanell, M. D.
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h-index: 0
机构:
Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA

Johnson, G. R.
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h-index: 0
机构:
Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA
机构:
[1] Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA
关键词:
SECONDARY-ELECTRON EMISSION;
SHEATH;
D O I:
10.1103/PhysRevLett.122.015003
中图分类号:
O4 [物理学];
学科分类号:
0702 ;
摘要:
Contemporary models of bounded plasmas assume that the target plasma electron temperature far exceeds the temperature of the cold electrons emitted from the target, T-emit. We show that when the sheath facing a collisional plasma becomes inverted, the target plasma electron temperature has to equal T-emit even if the upstream plasma is hotter by orders of magnitude. This extreme cooling effect can alter the plasma properties and the heat transmission to thermionically emitting surfaces in many applications. It also opens a possibility of using thermionic divertor plates to induce detachment in tokamaks.
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