2016
DOI: 10.1585/pfr.11.2402111
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Observation of Electron Density Fluctuations by Using the O-Mode Microwave Imaging Reflectometry (O-MIR) in LHD

Abstract: The O-mode microwave imaging reflectometry (O-MIR) has been developed. The frequency is 26-34 GHz, which corresponds to the cutoff electron density of 0.8-1.5 × 10 19 m −3. Since the local wave of the newly developed horn antenna millimeter wave imaging device (HMID) is fed by coaxial cable, the optical system of O-MIR is significantly simplified. By using O-MIR, the edge electron density fluctuation in an H-mode plasma is observed in LHD. The spectrum in the wave number and the frequency (k-ω) space is obtain… Show more

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Cited by 3 publications
(6 citation statements)
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References 13 publications
(14 reference statements)
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“…An O-mode MIR is applied to LHD plasmas [46,47]. The edge density fluctuation is measured in L-mode and H-mode plasmas.…”
Section: Application To Magnetically Confined Plasmasmentioning
confidence: 99%
See 1 more Smart Citation
“…An O-mode MIR is applied to LHD plasmas [46,47]. The edge density fluctuation is measured in L-mode and H-mode plasmas.…”
Section: Application To Magnetically Confined Plasmasmentioning
confidence: 99%
“…The key parameters of fluctuation are the wave number (k) and the frequency (ω). In order to obtain the k-ω spectrum two-point cross-spectrum S ij (ω) is evaluated [46]. The wave numbers between two MIR channels (i, j) which have the distance of d ij can be obtained from The coherence is the normalized cross-power spectrum given by An example of the results is shown in Figure 14.…”
Section: Application To Magnetically Confined Plasmasmentioning
confidence: 99%
“…the cutoff layer that may represent density fluctuation [3]. MIR has been intensively developed at the National Institute for Fusion Science (NIFS) for the TPE-RX RFP device [3,4] and for the large helical device (LHD) [5][6][7][8]. In the last MIR experiment at LHD [8], a newly developed horn-antenna millimeter-wave imaging detector (HMID) [9,10] was employed.…”
Section: Introductionmentioning
confidence: 99%
“…MIR has been intensively developed at the National Institute for Fusion Science (NIFS) for the TPE-RX RFP device [3,4] and for the large helical device (LHD) [5][6][7][8]. In the last MIR experiment at LHD [8], a newly developed horn-antenna millimeter-wave imaging detector (HMID) [9,10] was employed. This paper describes the O-mode MIR system (O-MIR), which is installed in the Tokyo Spherical Tokamak 2 (TST-2) [11], and preliminary results on the electron density fluctuation measurements on IRE in TST-2 are presented.…”
Section: Introductionmentioning
confidence: 99%
“…A microwave-imaging reflectometer was employed with ECEI on LHD until 2016 [8][9][10][11][12][13][14]. At the beginning of the D-D plasma experiment of LHD, we refined the receiving antennas called as Horn-antenna Millimeter Imaging Device (HMID) [13], which was originally developed by the LHD group.…”
Section: Introductionmentioning
confidence: 99%