High density Langmuir probe array for NSTX scrape-off layer measurements under lithiated divertor conditions

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3494381· OSTI ID:1037140

Kallman, J ^[1]; Jaworski, M A ^[1]; Kaita, R ^[1]; Kugel, H ^[1]; Gray, T K ^[2]

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1. Princeton Plasma Physics Laboratory (PPPL)
2. Oak Ridge National Laboratory (ORNL)

A high density Langmuir probe array has been developed for measurements of scrape-off layer parameters in NSTX. Relevant scale lengths for heat and particle fluxes are 1-5 cm. Transient edge plasma events can occur on a time scale of several milliseconds, and the duration of a typical plasma discharge is similar to 1 s. The array consists of 99 individual electrodes arranged in three parallel radial rows to allow both swept and triple-probe operation and is mounted in a carbon tile located in the lower outer divertor of NSTX between two segments of the newly installed liquid lithium divertor. Initial swept probe results tracking the outer strike point through probe flux measurements are presented.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1037140
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 81; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CARBON
DIVERTORS
ELECTRODES
LANGMUIR PROBE
LITHIUM
NSTX DEVICE
PLASMA
PLASMA SCRAPE-OFF LAYER
TOKAMAK
TRANSIENTS