Vu, H. X. and Gould, R. W. (1989) Plasma collection by an obstacle. Physics Letters B , 1 (1). pp. 68-71. ISSN 0370-2693. http://resolver.caltech.edu/CaltechAUTHORS:20120531-102516730
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Plasma flow to an obstacle is examined using the two‐fluid equations. In this model the obstacle is assumed to be a two‐dimensional strip that extends to infinity in the y direction (slab geometry). An obstacle inserted into a magnetized plasma will cast a "shadow" along the magnetic field lines. The natural collection length of such an obstacle is a measure of the length of its shadow. This study shows that in a typical fusion tokamak, where c_s/Ω_(ci)d≪1 (Ω_(ci), c_s are the ion cyclotron frequency and the ion acoustic speed, respectively, d is the half‐width of the strip), the particle collection length of an obstacle can be approximated as L_∥=0.23c_sd^2/ D_⊥, if D_⊥/ c_sd ≪1; or 0.30d, if D_⊥/ c_sd ≫1. For the cases examined in this study, the inclusion of the electron–ion collisional drag parallel to B_0 changes the solution only by an insignificant amount.
|Additional Information:||© 1989 American Institute of Physics. Received 22 June 1988; accepted 6 September 1988. This work was supported by the U.S. Department of Energy, Office of Fusion Energy Grant No. DE-FG03-85ER53173 and the Magnetic Fusion Science Fellowship Program.|
|Subject Keywords:||PLASMA DRIFT, MAGNETIZATION, SLABS, TOKAMAK DEVICES, THERMONUCLEAR REACTIONS, ELECTRON−ION COLLISIONS, DRAG, LIMITERS, PLASMA SIMULATION, TWO−DIMENSIONAL CALCULATIONS|
|Classification Code:||PACS: 52.40.Hf; 52.30.-q|
|Official Citation:||Plasma collection by an obstacle H. X. Vu and R. W. Gould Phys. Fluids B 1, 68 (1989); http://dx.doi.org/10.1063/1.859106|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||31 May 2012 18:00|
|Last Modified:||26 Dec 2012 15:17|
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