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A frequency-modulated continuous-wave reflectometer for the Lithium Tokamak Experiment
- Source :
- The Review of scientific instruments. 88(5)
- Publication Year :
- 2017
-
Abstract
- The frequency-modulated continuous-wave reflectometer on LTX (Lithium Tokamak Experiment) and the data analysis methods used for determining electron density profiles are described. The diagnostic uses a frequency range of 13.1–33.5 GHz, for covering a density range of 0.21–1.4×1013 cm−3 (in O-mode polarization) with a time resolution down to 8 μs. The design of the diagnostic incorporates the concept of an “optimized” source frequency sweep, which minimizes the large variation in the intermediate frequency signal due to a long dispersive transmission line. The quality of the raw data is dictated by the tuning characteristics of the microwave sources, as well as the group delay ripple in the transmission lines, which can generate higher-order nonlinearities in the frequency sweep. Both effects are evaluated for our diagnostic and best practices are presented for minimizing “artifacts” generated in the signals. The quality of the reconstructed profiles is also improved using two additional data analysis me...
- Subjects :
- Materials science
business.industry
010502 geochemistry & geophysics
01 natural sciences
Sweep frequency response analysis
010305 fluids & plasmas
Electric power transmission
Nuclear magnetic resonance
Optics
Intermediate frequency
Transmission line
0103 physical sciences
Data analysis
Lithium Tokamak Experiment
Continuous wave
business
Instrumentation
Microwave
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 10897623
- Volume :
- 88
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- The Review of scientific instruments
- Accession number :
- edsair.doi.dedup.....df5763356a80923a329376e53a3fd56a