Abstract
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 ∼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.
| Original language | English |
|---|---|
| Article number | 10E117 |
| Journal | Review of Scientific Instruments |
| Volume | 81 |
| Issue number | 10 |
| DOIs | |
| State | Published - Oct 2010 |
Funding
The authors would like to thank Larry Guttadora, Doug Westover, Scott Gifford, Mike Anderson, and Westley Reese, without whom the assembly and installation of the probe array would not have been possible. This was supported by U.S. DOE under Grant Nos. DE-AC02-09CH11466 and DE-AC05-00OR22725.