First results of the SOL reflectometer on Alcator C-Mod

C. Lau, G. Hanson, Y. Lin, J. Wilgen, S. Wukitch, B. Labombard, G. Wallace

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Abstract

A swept-frequency X-mode reflectometer has been built on Alcator C-Mod to measure the scrape-off layer (SOL) density profiles adjacent to the lower hybrid launcher. The reflectometer system operates between 100 and 146 GHz at sweep rates from 10 μs to 1 ms and covers a density range of ∼10 16-10 20 m -3 at B 0=5-5.4 T. This paper discusses the analysis of reflectometer density profiles and presents first experimental results of SOL density profile modifications due to the application of lower hybrid range-of-frequencies power to L-mode discharges. Comparison between density profiles measured by the X-mode reflectometer and scanning Langmuir probes is also shown.

Original languageEnglish
Article number10E309
JournalReview of Scientific Instruments
Volume83
Issue number10
DOIs
StatePublished - Oct 2012
Externally publishedYes

Funding

This work was supported by (U.S.) Department of Energy (DOE) under Award Nos. DE-AC05-00OR22725 and DE-FC02-99ER54512.

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