Signal evaluations using singular value decomposition for Thomson scattering diagnostics

Journal Article · Sat Nov 15 04:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4896478· OSTI ID:22303471

Yatsuka, E.; Hatae, T.; Itami, K. ^[1]; Yamada, I.; Yasuhara, R.; Funaba, H.; Hayashi, H. ^[2]

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1. Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193 (Japan)
2. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)

This paper provides a novel method for evaluating signal intensities in incoherent Thomson scattering diagnostics. A double-pass Thomson scattering system, where a laser passes through the plasma twice, generates two scattering pulses from the plasma. Evaluations of the signal intensities in the spectrometer are sometimes difficult due to noise and stray light. We apply the singular value decomposition method to Thomson scattering data with strong noise components. Results show that the average accuracy of the measured electron temperature (T{sub e}) is superior to that of temperature obtained using a low-pass filter (<20 MHz) or without any filters.

• OSTI ID: 22303471
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 85; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
ELECTRON TEMPERATURE
LASER RADIATION
MHZ RANGE 01-100
PLASMA
PULSES
SIGNALS
SPECTROMETERS
THOMSON SCATTERING