Performance demonstration of vacuum microwave components critical for the operation of the ITER low-field side reflectometer

Muscatello, C. M.; Anderson, J. P.; Boivin, R. L.; Finkenthal, D. K.; Gattuso, A.; Kramer, G. J.; LeSher, M.; Mrazkova, T. J.; Neilson, G. H.; Peebles, W. A.; Rhodes, T. L.; Robinson, J. T.; Torreblanca, H.; Zeller, K.; Zeng, L.; Zolfaghari, A.

doi:10.1063/5.0040255

Performance demonstration of vacuum microwave components critical for the operation of the ITER low-field side reflectometer

Journal Article · Tue Mar 09 00:00:00 EST 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0040255· OSTI ID:1804653

^[1]; Anderson, J. P. ^[1]; Boivin, R. L. ^[1]; Finkenthal, D. K. ^[2]; ^[1]; ^[3]; LeSher, M. ^[1]; Mrazkova, T. J. ^[2]; ^[3]; Peebles, W. A. ^[4]; Rhodes, T. L. ^[4]; Robinson, J. T. ^[5]; Torreblanca, H. ^[6]; Zeller, K. ^[1]; ^[4]; Zolfaghari, A. ^[3]

General Atomics, San Diego, CA (United States)
Palomar Scientific Instruments, San Marcos, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Los Angeles, CA (United States)
Virginia Commonwealth Univ., Richmond, VA (United States)
CompX, Del Mar, CA (United States)

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.

Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Contributing Organization:: DIII-D National Fusion Facility; Savannah River National Lab (SRNL), Aiken, SC (United States)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; SC0018107

OSTI ID:: 1804653

Alternate ID(s):: OSTI ID: 1769990

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 92; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (8)

Low-loss Transmission Lines for High-power Terahertz Radiation Nanni, Emilio Alessandro; Jawla, Sudheer Kumar; Shapiro, Michael A. Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 33, Issue 7 https://doi.org/10.1007/s10762-012-9870-5	journal	February 2012
The design of quarter-wave matching layers for dielectric surfaces Collin, R. E.; Brown, John Proceedings of the IEE Part C: Monographs, Vol. 103, Issue 3 https://doi.org/10.1049/pi-c.1956.0018	journal	January 1956
A free-standing wire scattering technique to monitor calibration variations of the DIII-D density profile reflectometer Zeng, L.; Wang, G.; Rhodes, T. L. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036581	journal	October 2018
Antenna-plasma coupling calculations for the ITER low-field side reflectometer Kramer, G. J.; Valeo, E. J.; Zolfaghari, A. Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aadea1	journal	September 2018
Preliminary design overview and performance assessment of the ITER low-field side reflectometer Muscatello, C. M.; Anderson, C.; Anderson, J. Nuclear Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1741-4326/ab7e46	journal	April 2020
Gyrotron internal mode converter reflector shaping from measured field intensity Denison, D. R.; Chu, T. S.; Shapiro, M. A. IEEE Transactions on Plasma Science, Vol. 27, Issue 2 https://doi.org/10.1109/27.772280	journal	April 1999
Phase retrieval of gyrotron beams based on irradiance moments Anderson, J. P.; Shapiro, M. A.; Temkin, R. J. IEEE Transactions on Microwave Theory and Techniques, Vol. 50, Issue 6 https://doi.org/10.1109/tmtt.2002.1006414	journal	June 2002
Design of Circular Corrugated Waveguides to Transmit Millimeter Waves at ITER Doane, J. L. Fusion Science and Technology, Vol. 53, Issue 1 https://doi.org/10.13182/fst08-a1662	journal	January 2008

Similar Records

Status of the development and testing of in-vessel and ECH-protection components for the ITER low-field side reflectometer

Journal Article · Wed Apr 02 20:00:00 EDT 2025 · Plasma Physics and Controlled Fusion · OSTI ID:2547005

Preliminary design overview and performance assessment of the ITER low-field side reflectometer

Journal Article · Thu Apr 23 20:00:00 EDT 2020 · Nuclear Fusion · OSTI ID:1603944

Related Subjects

47 OTHER INSTRUMENTATION

Performance demonstration of vacuum microwave components critical for the operation of the ITER low-field side reflectometer

Citation Formats

References (8)

Similar Records

Related Subjects