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Impact of a Langmuir probe on turbulence measurements in the Scrape-Off-Layer of tokamaks

Abstract : An issue for Langmuir probe measurements of SOL turbulence concerns the impact of the probe itself on plasma transport. The aim of this paper is to investigate this issue with a synthetic reconstruction of Langmuir probe measurements by inserting a synthetic probe into a 2D fluid SOL turbulence code. The effect of a biased probe is analysed as a function of its size. It is shown that the probe creates a transport barrier whose effect is non-local and affects the current's circulation in the plasma. The plasma density is depleted by the presence of the probe as well as the electrostatic potential. A strong impact on turbulence can also be observed. Such observations imply that the probed turbulence can differ significantly from the probe-free turbulence
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https://hal.archives-ouvertes.fr/hal-01019696
Contributor : Clothilde Colin Connect in order to contact the contributor
Submitted on : Monday, July 7, 2014 - 1:33:49 PM
Last modification on : Thursday, November 4, 2021 - 2:44:03 PM

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Clothilde Colin, Patrick Tamain, Philippe Ghendrih, Frederic Schwander, Eric Serre. Impact of a Langmuir probe on turbulence measurements in the Scrape-Off-Layer of tokamaks. Contributions to Plasma Physics, Wiley-VCH Verlag, 2014, 54 (4-6), pp.543-548. ⟨10.1002/ctpp.201410087⟩. ⟨hal-01019696⟩

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