15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

2.50 Title of Abstract: Application of Portable Near-Infrared Spectrometer to Heliotron J Plasmas

16 Apr 2018, 10:45
2h 15m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Shinichiro Kado (Institute of Advanced Energy, Kyoto University ) Akihiro Iwata (Graduate School of Energy Science, Kyoto University) Tomomi Kanazawa (Graduate School of Energy Science, Kyoto University ) Hiroyuki Okada (Institute of Advanced Energy, Kyoto University) Satoshi Yamamoto (Institute of Advanced Energy, Kyoto University) Gen Motojima (National Institute for Fusion Science) Hisashi Okazaki (Graduate School of Energy Science, Kyoto University) Takashi Minami (Institute of Advanced Energy, Kyoto University) Shinji Kobayashi (Institute of Advanced Energy, Kyoto University) Kazunobu Nagasaki (Institute of Advanced Energy, Kyoto University) Shinsuke Ohshima (Institute of Advanced Energy, Kyoto University) Yuji Nakamura (Graduate School of Energy Science, Kyoto University) Akihiro Ishizawa (Graduate School of Energy Science, Kyoto University) Shigeru Konoshima (Institute of Advanced Energy, Kyoto University) Toru Mizuchi (Institute of Advanced Energy, Kyoto University)

Description

A Simple near-infrared (NIR) spectrometer for 898 - 2130 nm has recently been applied to Heliotron J plasmas. It adopts symmetrical crossed Czerny-Turner mount equipped with a thermoelectrically cooled 512 channel InGaAs linear sensor. Reciprocal linear dispersion was deduced as 96.37 nm/mm at the center of the detector. Several types of the 2nd order rejection filter are inserted in the collection optics as needed. Calibration was performed together with a visible spectrometer using a tungsten halogen lamp and the result was compared with the intensity ratio of the Paschen α (1875 nm) and Balmer β (486 nm) lines, both of which have a common upper quantum level. The purpose of this study includes extending the wavelength region of the spectral monitor to less contaminated region. In the preliminary measurements, we observed the Paschen series for the hydrogen pellet injection plasma and two atomic helium lines, i.e. 2S-2P singlet and triplet lines, for Helium gas puffing experiments. A Continuum spectrum in this regime is entirely attributable to the blackbody radiation from the heat spots on the plasma-facing components. In addition, this may also be used to monitor if there are any significant background radiation in the YAG Thomson scattering signals near 1064 nm.

Primary author

Shinichiro Kado (Institute of Advanced Energy, Kyoto University )

Co-authors

Akihiro Iwata (Graduate School of Energy Science, Kyoto University) Tomomi Kanazawa (Graduate School of Energy Science, Kyoto University ) Hiroyuki Okada (Institute of Advanced Energy, Kyoto University) Satoshi Yamamoto (Institute of Advanced Energy, Kyoto University) Gen Motojima (National Institute for Fusion Science) Hisashi Okazaki (Graduate School of Energy Science, Kyoto University) Takashi Minami (Institute of Advanced Energy, Kyoto University) Shinji Kobayashi (Institute of Advanced Energy, Kyoto University) Kazunobu Nagasaki (Institute of Advanced Energy, Kyoto University) Shinsuke Ohshima (Institute of Advanced Energy, Kyoto University) Yuji Nakamura (Graduate School of Energy Science, Kyoto University) Akihiro Ishizawa (Graduate School of Energy Science, Kyoto University) Shigeru Konoshima (Institute of Advanced Energy, Kyoto University) Toru Mizuchi (Institute of Advanced Energy, Kyoto University)

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