Abstract
Although the physics of the “sheath”, a thin layer of plasma just in front of the material surface, has been studied for more than 100 years, the peculiarities of fusion devices, such as strong magnetic field, a shallow angle at which the magnetic field lines intersect the material surface, and inhomogeneity of the plasma parameters, bring some new and important features in this topic, which are discussed in this chapter.
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References
D. Bohm, E.H.S. Burhop, H.S.W. Massey, The Characteristic of Electrical Discharges in Magnetic Fields (McGraw-Hill, New York, 1949) Chapter 2
R. Chodura, Plasma-wall transition in an oblique magnetic field. Phys. Fluids 25, 1628–1633 (1982)
K.-U. Riemann, Theory of the collisional presheath in an oblique magnetic field. Phys. Plasmas 1, 552–558 (1994)
A.B. Mikhailovskii, Theory of plasma instabilities, in Instabilities in a Homogeneous Plasma, vol. 1, (Springer, New York, 1974)
S.D. Baalrud, C.C. Hegna, Kinetic theory of the presheath and the Bohm criterion. Plasma Sources Sci. Technol. 20, 025013 (2011)
E.R. Harrison, W.B. Thompson, The low pressure plane symmetric discharge. Proc. Phys. Soc. 74, 145–152 (1959)
K. Aoki, Y. Sone, T. Yamada, Numerical analysis of gas flows condensing on its plane condensation phase on the basis of kinetic theory. Phys. Fluids A2, 1867–1878 (1990)
L.D. Landau, L.M. Lifshitz, Fluid mechanics, in Course of Theoretical Physics, vol. 6, 2nd edn., (Butterworth-Heinemann, Oxford, 1987)
J.E. Allen, A note on the generalized sheath criterion. J. Phys. D. Appl. Phys. 9, 2331–2332 (1976)
R.H. Cohen, D.D. Ryutov, Particle trajectories in a sheath in a strongly tilted magnetic field. Phys. Plasmas 5, 808–817 (1998)
K.-U. Riemann, Comment on ‘kinetic theory of the presheath and the Bohm criterion’. Plasma Sources Sci. Technol. 21, 068011 (2012)
V. Rozhansky, E. Kaveeva, P. Molchanov, I. Veselova, S. Voskoboynikov, D. Coster, G. Counsell, A. Kirk, S. Lisgo, The ASDEX-Upgrade Team and The MAST Team, New B2SOLPS5.2 transport code for H-mode regimes in tokamaks. Nucl. Fusion 49, 025007 (2009)
Z. Guo, X.-Z. Tang, Ambipolar transport via trapped-electron whistler instability along open magnetic field lines. Phys. Rev. Lett. 109, 135005 (2012)
K.-U. Riemann, Kinetic analysis of the collisional plasma–sheath transition. J. Phys. D. Appl. Phys. 36, 2811–2820 (2003)
S. Kuhn, K.-U. Riemann, N. Jelić, D.D. Tskhakaya Sr., D. Tskahaya Jr., Link between fluid and kinetic parameters near the plasma boundary. Phys. Plasmas 13, 013503 (2006)
I.H. Hutchinson, The magnetic presheath boundary condition with E×B drifts. Phys. Plasmas 3, 6–7 (1996)
A.V. Chankin, P.C. Stangeby, The effect of diamagnetic drift on the boundary conditions in tokamak scrape-off layers and the distribution of plasma fluxes near the target. Plasma Phys. Control. Fusion 36, 1485–1499 (1994)
R.H. Cohen, D.D. Ryutov, Sheath physics and boundary conditions for edge plasmas. Contrib. Plasma Phys. 44, 111–125 (2004)
R.H. Cohen, D.D. Ryutov, Non-steady-state boundary conditions for a sheath in a tilted magnetic field. Plasma Phys. Rep. 23, 805–809 (1997)
G.D. Hobbs, J.A. Wesson, Heat flow through a Langmuir sheath in the presence of electron emission. Plasma Phys. 9, 85–87 (1967)
M.Y. Ye, S. Masuzaki, K. Shiraishi, S. Takamura, N. Ohno, Nonlinear interactions between high heat flux plasma and electron-emissive hot material surface. Phys. Plasmas 3, 281–292 (1996)
M.Z. Tokar, A.V. Nedospasov, A.V. Yaroshkin, The possible nature of hot spots on tokamak walls. Nucl. Fusion 32, 15–24 (1992)
M.D. Companell, Negative plasma potential relative to electron-emitting surfaces. Phys. Rev. E 88, 033103 (2013)
M.D. Companell, M.V. Umansky, Strongly emitting surfaces unable to float below plasma potential. Phys. Rev. Lett. 116, 085003 (2016)
M.D. Companell, G.R. Johnson, Thermionic cooling of the target plasma to a sub-eV temperature. Phys. Rev. Lett. 226, 015003 (2019)
R. Masline, R.D. Smirnov, S.I. Krasheninnikov, Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations. To appear in Contrib. Plasma Phys. (2020)
C. Ionita, J. Grünwald, C. Maszl, R. Stärz, M. Čerček, B. Fonda, T. Gyergyek, G. Filipič, J. Kovačič, C. Silva, H. Figueiredo, T. Windisch, O. Grulke, T. Klinger, R. Schrittwieser, The use of emissive probes in laboratory and tokamak plasmas. Contrib. Plasma Phys. 51, 264–270 (2011)
B.F. Kraus, Y. Raitses, Floating potential of emitting surfaces in plasmas with respect to the space potential. Phys. Plasmas 25, 030701 (2018)
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Krasheninnikov, S., Smolyakov, A., Kukushkin, A. (2020). Sheath Physics. In: On the Edge of Magnetic Fusion Devices. Springer Series in Plasma Science and Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-49594-7_4
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DOI: https://doi.org/10.1007/978-3-030-49594-7_4
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