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Title: Single Langmuir probe characteristic in a magnetized plasma at the text tokamak

Abstract

A single Langmuir probe tip was used at TEXT-Upgrade to obtain I-V characteristics in a magnetized plasma. Noisy data were reduced by a boxcar-averaging routine. Unexpected effects, namely nonsaturation of ion current, hysterises in the characteristics and I(V)-data were observed, which are in disagreement to the common single probe model. A double probe model allows parameterization of the I(V) curves and to determine the plasma properties in the scrape-off layer. It is shown in this model that a Langmuir probe does perturb the local space potential in the plasma. Comparisons were made with the triple probe technique of measuring temperatures. The nonsaturation of ion current leads to an error in the triple probe technique of order 20%.

Authors:
 [1]
  1. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Texas Univ., Austin, TX (United States). Fusion Research Center
Sponsoring Org.:
USDOE
OSTI Identifier:
69162
Report Number(s):
DOE/ER/54241-138; FRCR-456
ON: DE95012144; TRN: 95:015403
DOE Contract Number:  
FG03-94ER54241
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (M.S.); PBD: May 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; TEXT DEVICES; LANGMUIR PROBE; MAGNETIZATION; PLASMA SCRAPE-OFF LAYER; DATA ACQUISITION SYSTEMS

Citation Formats

Jachmich, Stefan. Single Langmuir probe characteristic in a magnetized plasma at the text tokamak. United States: N. p., 1995. Web. doi:10.2172/69162.
Jachmich, Stefan. Single Langmuir probe characteristic in a magnetized plasma at the text tokamak. United States. https://doi.org/10.2172/69162
Jachmich, Stefan. 1995. "Single Langmuir probe characteristic in a magnetized plasma at the text tokamak". United States. https://doi.org/10.2172/69162. https://www.osti.gov/servlets/purl/69162.
@article{osti_69162,
title = {Single Langmuir probe characteristic in a magnetized plasma at the text tokamak},
author = {Jachmich, Stefan},
abstractNote = {A single Langmuir probe tip was used at TEXT-Upgrade to obtain I-V characteristics in a magnetized plasma. Noisy data were reduced by a boxcar-averaging routine. Unexpected effects, namely nonsaturation of ion current, hysterises in the characteristics and I(V)-data were observed, which are in disagreement to the common single probe model. A double probe model allows parameterization of the I(V) curves and to determine the plasma properties in the scrape-off layer. It is shown in this model that a Langmuir probe does perturb the local space potential in the plasma. Comparisons were made with the triple probe technique of measuring temperatures. The nonsaturation of ion current leads to an error in the triple probe technique of order 20%.},
doi = {10.2172/69162},
url = {https://www.osti.gov/biblio/69162}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 1995},
month = {Mon May 01 00:00:00 EDT 1995}
}

Thesis/Dissertation:
Other availability
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