Biasing, acquisition, and interpretation of a dense Langmuir probe array in NSTX

M. A. Jaworski, J. Kallman, R. Kaita, H. Kugel, B. Leblanc, R. Marsala, D. N. Ruzic

Research output: Contribution to journalArticlepeer-review

Abstract

A dense array of 99 Langmuir probes has been installed in the lower divertor region of the National Spherical Torus Experiment (NSTX). This array is instrumented with a system of electronics that allows flexibility in the choice of probes to bias as well as the type of measurement (including standard swept, single probe, triple probe, and operation as passive floating potential and scrape-off-layer SOL current monitors). The use of flush-mounted probes requires careful interpretation. The time dependent nature of the SOL makes swept-probe traces difficult to interpret. To overcome these challenges, the single- and triple-Langmuir probe signals are used in complementary fashion to determine the temperature and density at the probe location. A comparison to midplane measurements is made.

Original languageEnglish (US)
Article number10E130
JournalReview of Scientific Instruments
Volume81
Issue number10
DOIs
StatePublished - Oct 2010

ASJC Scopus subject areas

  • Instrumentation

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