title: Signal evaluations using singular value decomposition for Thomson scattering diagnostics.
abstract: 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 (Te) is superior to that of temperature obtained using a low-pass filter (<20 MHz) or without any filters.
authors.affiliation: Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tojo
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Yamada
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Yasuhara
authors.affiliation: Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Yatsuka
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Funaba
authors.affiliation: Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hatae
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hayashi
authors.affiliation: Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Itami