Experimental studies of the difference between plasma potentials measured by Langmuir probes and emissive probes in presheaths

Li, Peixuan; Hershkowitz, Noah; Wackerbarth, Eugene; Severn, Greg

doi:10.1088/1361-6595/ab69e5

Title: Experimental studies of the difference between plasma potentials measured by Langmuir probes and emissive probes in presheaths

Journal Article · Fri Feb 14 00:00:00 EST 2020 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ab69e5· OSTI ID:1802588

Li, Peixuan ^[1]; Hershkowitz, Noah ^[1]; Wackerbarth, Eugene ^[2];

^[2]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Univ. of San Diego, San Diego, CA (United States). Dept. of Physics & Biophysics

The plasma potential measured by cylindrical and planar Langmuir probes has been shown to differ from the plasma potential measured by emissive probes in the neighborhood of the presheath near a negatively biased electrode immersed in a weakly collisional low temperature argon plasma. There are two principal results demonstrated in this paper. First, while it is well known that Langmuir probes cannot reliably measure plasma potentials inside of sheaths, results presented here demonstrate that the problem persists in presheaths, the quasineutral plasma bordering sheaths. It is known that emissive probes analyzed in the limit of zero emission accurately measure the plasma potential in the sheath. It is now clear that they are the only known electrostatic probe technique able to measure the plasma potential accurately throughout the presheath. Second, it is shown that the difference between potential measurements made by Langmuir probes and emissive probes in the body of the plasma, farther than a presheath distance from the boundary, is not proportional to T_e, as has been previously claimed.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)

Grant/Contract Number:: SC0014226; PHY-1464741; PHY-1464838; PHY-1804654; PHY-1804240

OSTI ID:: 1802588

Journal Information:: Plasma Sources Science and Technology, Vol. 29, Issue 2; ISSN 1361-6595

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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