A Real-Time Synchronous Detector for the TAE Antenna Diagnostic at JET

Routine studies are performed on JET using a new set of antennas to excite Toroidal Alfven Eigenmodes (TAE). A TAE resonance footprint is observed in the plasma response measurement when there is a noticeable variation in both the amplitude and the phase of the response with respect to the excitation. An algorithm for real-time identification of TAE resonances, based on a hardware lock-in amplifier, is presently used at the Joint European Torus (JET) tokamak for detecting such variations. In this paper, we revisit the problem of estimating the I-Q characteristics from a known non-stationary frequency mode, with a resonant-like phase response, embedded in a digital signal. A non-stationary linear model is used in a recursive filter implementation of a lock-in amplifier. We propose it as a viable alternative to hardware synchronous detectors such as the one in use at the JET and compare its' performance with standard digital lock-in techniques in terms of bandwidth and phase response under high throughput rates requirements.


Published in:
IEEE Transactions on Nuclear Science, 57, 2, 577-582
Presented at:
16th IEEE/NPSS Real-Time Conference, Beijing, Peoples R. China, May 10-15, 2009
Year:
2010
Publisher:
Institute of Electrical and Electronics Engineers
ISSN:
0018-9499
ISBN:
0018-9499
Keywords:
Laboratories:
SPC
CRPP




 Record created 2011-04-15, last modified 2018-01-28


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