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Muscatello CM, Anderson JP, Boivin RL, Finkenthal DK, Gattuso A, Kramer GJ, LeSher M, Mrazkova TJ, Neilson GH, Peebles WA, Rhodes TL, Robinson JT, Torreblanca H, Zeller K, Zeng L, Zolfaghari A. Performance demonstration of vacuum microwave components critical for the operation of the ITER low-field side reflectometer. Rev Sci Instrum 2021; 92:033524. [PMID: 33820017 DOI: 10.1063/5.0040255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 02/21/2021] [Indexed: 06/12/2023]
Abstract
Final design studies in preparation for manufacturing have been performed for functional components of the vacuum portion of the ITER Low-Field Side Reflectometer (LFSR). These components consist of an antenna array, electron cyclotron heating (ECH) protection mirrors, phase calibration mirrors, and vacuum windows. Evaluation of these components was conducted at the LFSR test facility and DIII-D. The antenna array consists of six corrugated-waveguide antennas for simultaneous profile, fluctuation, and Doppler measurements. A diffraction grating, incorporated into the plasma-facing miter bend, provides protection of sensitive components from stray ECH at 170 GHz. For in situ phase calibration of the LFSR profile reflectometer, an embossed mirror is incorporated into the adjacent miter bend. Measurements of the radiated beam profile indicate that these components have a small, acceptable effect on mode conversion and beam quality. Baseline transmission characteristics of the dual-disk vacuum window are obtained and are used to guide ongoing developments. Preliminary simulations indicate that a surface-relief structure on the window surfaces can greatly improve transmission. The workability of real-time phase measurements was demonstrated on the DIII-D profile reflectometer. The new automated real-time analysis agrees well with the standard post-processing routine.
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Affiliation(s)
- C M Muscatello
- General Atomics, 3550 General Atomics Court, San Diego, California 92121-1122, USA
| | - J P Anderson
- General Atomics, 3550 General Atomics Court, San Diego, California 92121-1122, USA
| | - R L Boivin
- General Atomics, 3550 General Atomics Court, San Diego, California 92121-1122, USA
| | - D K Finkenthal
- Palomar Scientific Instruments, San Marcos, California 92069, USA
| | - A Gattuso
- General Atomics, 3550 General Atomics Court, San Diego, California 92121-1122, USA
| | - G J Kramer
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
| | - M LeSher
- General Atomics, 3550 General Atomics Court, San Diego, California 92121-1122, USA
| | - T J Mrazkova
- Palomar Scientific Instruments, San Marcos, California 92069, USA
| | - G H Neilson
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
| | - W A Peebles
- University of California, Los Angeles, 475 Portola Plaza, Los Angeles, California 90095-1547, USA
| | - T L Rhodes
- University of California, Los Angeles, 475 Portola Plaza, Los Angeles, California 90095-1547, USA
| | - J T Robinson
- Virginia Commonwealth University, 907 Floyd Ave., Richmond, Virginia 23284, USA
| | - H Torreblanca
- CompX, P.O. Box 2672, Del Mar, California 92014-5672, USA
| | - K Zeller
- General Atomics, 3550 General Atomics Court, San Diego, California 92121-1122, USA
| | - L Zeng
- University of California, Los Angeles, 475 Portola Plaza, Los Angeles, California 90095-1547, USA
| | - A Zolfaghari
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
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