Microwave reflectometer for density profile and turbulence measurements on the COMPASS tokamak
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 probi...
Saved in:
Published in: | Review of scientific instruments 2020-01, Vol.91 (1), p.013515-013515 |
---|---|
Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | 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 × 1018 m−3 to 3.6 × 1019 m−3. Experimental results obtained on COMPASS discharges are presented to demonstrate the performance of the diagnostics. |
---|---|
ISSN: | 0034-6748 1089-7623 |
DOI: | 10.1063/1.5099345 |