SOL Reflectometer for Alcator C-MOD

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3491225· OSTI ID:993801

Lau, Cornwall H ^[1]; Hanson, Gregory R ^[2]; Wilgen, John B ^[2]; Lin, Dr Yijun ^[1]; Wukitch, Dr Steve ^[1]

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1. Massachusetts Institute of Technology (MIT)
2. ORNL

A swept-frequency X-mode reflectometer is being built for Alcator C-Mod to measure the scrape-off layer density profiles at the top, middle, and bottom locations in front of both the new lower hybrid launcher and the new ion cyclotron range of frequencies antenna. The system is planned to operate between 100 and 146 GHz at sweep rates from 10 {micro}s to 1 ms, and will cover a density range of approximately 10{sup 16}-10{sup 20} m{sup -3} at B{sub 0} = 5-5.4 T. To minimize the effects of density fluctuations, both differential phase and full phase reflectometry will be employed. Design, test data, and calibration results of this electronics system will be discussed. To reduce attenuation losses, tallguide (TE{sub 01}) will be used for most of the transmission line system. Simulations of high mode conversion in tallguide components, such as e-plane hyperbolic secant radius of curvature bends, tapers, and horn antennas will be shown. Experimental measurements of the total attenuation losses of these components in the lower hybrid waveguide run will also be presented.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 993801
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
43 PARTICLE ACCELERATORS
ANTENNAS
ATTENUATION
CALIBRATION
CYCLOTRONS
DESIGN
FLUCTUATIONS
MODE CONVERSION
POWER TRANSMISSION LINES
WAVEGUIDES