Overestimation of Mach number due to probe shadow

Gosselin, J. J.; Thakur, S. C.; Sears, S. H.; McKee, J. S.; Scime, E. E.; Tynan, G. R.

doi:10.1063/1.4954820

Title: Overestimation of Mach number due to probe shadow

Journal Article · Thu Jul 28 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4954820· OSTI ID:1467827

^[1];

^[1]; Sears, S. H. ^[2]; McKee, J. S. ^[3]; Scime, E. E. ^[3]; Tynan, G. R. ^[1]

Univ. of California, San Diego, CA (United States). Center for Energy Research
Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
West Virginia Univ., Morgantown, WV (United States). Dept. of Physics

Comparisons of the plasma ion flow speed measurements from Mach probes and laser induced fluorescence were performed in the Controlled Shear Decorrelation Experiment. We show the presence of the probe causes a low density geometric shadow downstream of the probe that affects the current density collected by the probe in collisional plasmas if the ion-neutral mean free path is shorter than the probe shadow length, L_g = w² V_drift/D_⊥, resulting in erroneous Mach numbers. We also present a simple correction term that provides the corrected Mach number from probe data when the sound speed, ion-neutral mean free path, and perpendicular diffusion coefficient of the plasma are known. The probe shadow effect must be taken into account whenever the ion-neutral mean free path is on the order of the probe shadow length in linear devices and the open-field line region of fusion devices.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-07ER54912

OSTI ID:: 1467827

Alternate ID(s):: OSTI ID: 1274825

Journal Information:: Physics of Plasmas, Vol. 23, Issue 7; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling Kafle, N.; Owen, L. W.; Caneses, J. F. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5019266	journal	May 2018
Simultaneous measurements of turbulent Reynolds stresses and particle flux in both parallel and perpendicular directions in a linear magnetized plasma device Chakraborty Thakur, Saikat; Hong, Rongjie; Tynan, George R. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039433	journal	October 2018
Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment Hong, R.; Li, J. C.; Thakur, R. Hajjar. Chakraborty arXiv https://doi.org/10.48550/arxiv.1805.03705	text	January 2018

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