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Microwave reflectometer for density profile and turbulence measurements on the COMPASS tokamak.
- Source :
-
The Review of scientific instruments [Rev Sci Instrum] 2020 Jan 01; Vol. 91 (1), pp. 013515. - Publication Year :
- 2020
-
Abstract
- The fast microwave reflectometer system on the COMPASS tokamak consists of an O-mode polarized K-band (18 GHz-26 GHz), Ka-band (26 GHz-40 GHz), and a part of U-band (40 GHz-54 GHz). The plasma density profile from the edge plasma area is measured using a fast sweeping rate up of to 6 µs of the probing wave. The processing of the reflected signal is realized by the heterodyne detection configuration based on the I/Q modulator. Two different methods of dynamic calibration of the required linear sweep frequency, together with static frequency and dispersion calibration, were used. The electron density profile was reconstructed by a spectrogram-based method with four sweeps on average. The system has the capability to measure the mid-plane low-field side electron density profile in the density range from 4 × 10 <superscript>18</superscript> m <superscript>-3</superscript> to 3.6 × 10 <superscript>19</superscript> m <superscript>-3</superscript> . Experimental results obtained on COMPASS discharges are presented to demonstrate the performance of the diagnostics.
Details
- Language :
- English
- ISSN :
- 1089-7623
- Volume :
- 91
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The Review of scientific instruments
- Publication Type :
- Academic Journal
- Accession number :
- 32012635
- Full Text :
- https://doi.org/10.1063/1.5099345