Thermionic Cooling of the Target Plasma to a Sub-eV Temperature

被引:23
作者
Campanell, M. D. [1 ]
Johnson, G. R. [1 ]
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.
引用
收藏
页数:5
相关论文
共 34 条
  • [1] Electron collection and thermionic emission from a spherical dust grain in the space-charge limited regime
    Autricque, A.
    Khrapak, S. A.
    Couedel, L.
    Fedorczak, N.
    Arnas, C.
    Layet, J. -M.
    Grisolia, C.
    [J]. PHYSICS OF PLASMAS, 2018, 25 (06)
  • [2] Instability-Enhanced Collisional Friction Can Determine the Bohm Criterion in Multiple-Ion-Species Plasmas
    Baalrud, S. D.
    Hegna, C. C.
    Callen, J. D.
    [J]. PHYSICAL REVIEW LETTERS, 2009, 103 (20)
  • [3] Observation of Flat Electron Temperature Profiles in the Lithium Tokamak Experiment
    Boyle, D. P.
    Majeski, R.
    Schmitt, J. C.
    Hansen, C.
    Kaita, R.
    Kubota, S.
    Lucia, M.
    Rognlien, T. D.
    [J]. PHYSICAL REVIEW LETTERS, 2017, 119 (01)
  • [4] Absorption of an Electron by a Dielectric Wall
    Bronold, F. X.
    Fehske, H.
    [J]. PHYSICAL REVIEW LETTERS, 2015, 115 (22)
  • [5] Continuum kinetic and multi-fluid simulations of classical sheaths
    Cagas, P.
    Hakim, A.
    Juno, J.
    Srinivasan, B.
    [J]. PHYSICS OF PLASMAS, 2017, 24 (02)
  • [6] Improved understanding of the hot cathode current modes and mode transitions
    Campanell, M. D.
    Umansky, M. V.
    [J]. PLASMA SOURCES SCIENCE & TECHNOLOGY, 2017, 26 (12)
  • [7] Strongly Emitting Surfaces Unable to Float below Plasma Potential
    Campanell, M. D.
    Umansky, M. V.
    [J]. PHYSICAL REVIEW LETTERS, 2016, 116 (08)
  • [8] Strongly emissive plasma-facing material under space-charge limited regime: Application to emissive probes
    Cavalier, Jordan
    Lemoine, Nicolas
    Bousselin, Guillaume
    Plihon, Nicolas
    Ledig, Jordan
    [J]. PHYSICS OF PLASMAS, 2017, 24 (01)
  • [9] Charging and Heat Collection by a Positively Charged Dust Grain in a Plasma
    Delzanno, Gian Luca
    Tang, Xian-Zhu
    [J]. PHYSICAL REVIEW LETTERS, 2014, 113 (03)
  • [10] Anomalously high near-wall sheath potential drop in a plasma with nonlocal fast electrons
    Demidov, VI
    DeJoseph, CA
    Kudryavtsev, AA
    [J]. PHYSICAL REVIEW LETTERS, 2005, 95 (21)