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Title: Development of frequency modulation reflectometer for Korea Superconducting Tokamak Advanced Research tokamak

Frequency modulation reflectometer has been developed to measure the plasma density profile of the Korea Superconducting Tokamak Advanced Research tokamak. Three reflectometers are operating in extraordinary polarization mode in the frequency range of Q band (33.6–54 GHz), V band (48–72 GHz), and W band (72–108 GHz) to measure the density up to 7 × 10{sup 19} m{sup −3} when the toroidal magnetic field is 2 T on axis. The antenna is installed inside of the vacuum vessel. A new vacuum window is developed by using 50 μm thick mica film and 0.1 mm thick gold gasket. The filter bank of low pass filter, notch filter, and Faraday isolator is used to reject the electron cyclotron heating high power at attenuation of 60 dB. The full frequency band is swept in 20 μs. The mixer output is directly digitized with sampling rate of 100 MSamples/s. The phase is obtained by using wavelet transform. The whole hardware and software system is described in detail and the measured density profile is presented as a result.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5]
  1. National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
  2. University of Science and Technology, Daejeon 305-333 (Korea, Republic of)
  3. Korea Research Institute of Standards and Science, Daejeon 305-340 (Korea, Republic of)
  4. Yoonseul, Daejeon 306-120 (Korea, Republic of)
  5. Kyushu University, Kasuga 816-8580 (Japan)
Publication Date:
OSTI Identifier:
22224169
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANTENNAS; ATTENUATION; DENSITY; ECR HEATING; FILTERS; FREQUENCY MODULATION; GHZ RANGE; MAGNETIC FIELDS; MICA; MIXERS; NORTH KOREA; PLASMA DENSITY; PLASMA DIAGNOSTICS; TOKAMAK DEVICES