| Scrape-off layer reflectometer for Alcator C-Mod. | |
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MedLine Citation:
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PMID: 19044598 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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A two-frequency x-mode reflectometer operating from 100 to 146 GHz is deployed on Alcator C-Mod to measure the density profile and fluctuations in the scrape-off layer (SOL) immediately in front of the new J-port ICRF antenna and the new C-port lower hybrid launcher. The reflectometer covers densities from 10(16) to 10(20) m(-3) at 5-5.4 T. To provide the greatest flexibility and capability to deal with density fluctuations approaching 100% peak-to-peak in the SOL, both full-phase and differential-phase measurement capabilities with sweep speeds of approximately 10 micros to >1 ms are implemented. The differential-phase measurement uses a difference frequency of 500 MHz, corresponding to cutoff layer separations ranging from about 0.1 to 1 mm. The reflectometer has six sets of launchers: three on the ICRF antenna and three on the lower hybrid launcher. Both the ICRF antenna and the lower hybrid launcher incorporate reflectometer antennas at their top, bottom, and midplane locations. |
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Authors:
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G R Hanson; J B Wilgen; C Lau; Y Lin; G M Wallace; S J Wukitch |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Review of scientific instruments Volume: 79 ISSN: 1089-7623 ISO Abbreviation: Rev Sci Instrum Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-12-02 Completed Date: 2009-02-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0405571 Medline TA: Rev Sci Instrum Country: United States |
Other Details:
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Languages: eng Pagination: 10F114 Citation Subset: - |
Affiliation:
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Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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