Exact Solution for the Generalized Bohm Criterion in a Two-Ion-Species Plasma

Journal Article · Fri Oct 12 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.155004· OSTI ID:21024267

Lee, Dongsoo; Hershkowitz, Noah ^[1]; Oksuz, Lutfi ^[1]

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1. Department of Engineering Physics, University of Wisconsin at Madison, Madison, Wisconsin 53706 (United States)

For a weakly collisional two-ion species plasma, it is shown that the minimum phase velocity of ion acoustic waves (IAWs) at the sheath-presheath boundary is equal to twice the phase velocity in the bulk plasma. This condition provides a theoretical basis for the experimental results that each ion species leaves the plasma with a drift velocity equal to the IAW phase velocity in the bulk plasma [D. Lee et al., Appl. Phys. Lett. 91, 041505 (2007)]. It is shown that this result is a consequence of the generalized Bohm criterion and fluid expressions for the IAW phase velocities.

• OSTI ID: 21024267
• Journal Information: Physical Review Letters, Vol. 99, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.99.155004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOHM CRITERION
EXACT SOLUTIONS
ION ACOUSTIC WAVES
IONS
PHASE VELOCITY
PLASMA