Quantifying noise sources in the KSTAR 2014 Thomson Scattering system from the measured variation on electron temperature

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With the Thomson scattering (TS) system in KSTAR, temporal evolution of electron temperature (T-e) is estimated using a weighted look-up table method with fast sampling (1 : 25 or 2.5GS/s) digitizers during the 2014 KSTAR campaign. Background noise level is used as a weighting parameter without considering the photon noise due to the absence of information on absolute photon counts detected by the TS system. Estimated electron temperature during a relatively quiescent discharge are scattered, i.e., 15% variation on T-e with respect to its mean value. We find that this 15% variation on T-e cannot be explained solely by the background noise level which leads us to include photon noise effects in our analysis. Using synthetic data, we have estimated the required photon noise level consistent with the observation and determined the dominant noise source in KSTAR TS system.
Publisher
IOP PUBLISHING LTD
Issue Date
2016-03
Language
English
Article Type
Article; Proceedings Paper
Citation

JOURNAL OF INSTRUMENTATION, v.11

ISSN
1748-0221
DOI
10.1088/1748-0221/11/03/C03036
URI
http://hdl.handle.net/10203/209360
Appears in Collection
NE-Journal Papers(저널논문)
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