1
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Qiu D, Minami T, Kado S, Inagaki S, Wang C, Matsutani R, Toba S, Luo M, Zhang P, Kenmochi N, Ohshima S, Kobayashi S, Okada H, Mizuuchi T, Konoshima S, Yasuhara R, Nagasaki K. Increased signal separation upgrade permits preliminary electron anisotropy measurements with Heliotron J multi-pass Thomson diagnostic. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:023510. [PMID: 36859055 DOI: 10.1063/5.0101815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 09/12/2022] [Indexed: 06/18/2023]
Abstract
A signal separation system is constructed on the multi-pass Thomson scattering system of Heliotron J to solve the problem of overlapping scattered light signals for the electron temperature anisotropy measurement. The phenomenon of overlapping scattered light signals is relieved by operating the signal separation system. A Raman scattering experiment is undertaken to verify the separation effect of the signal separation system. Two scattered light signals corresponding to two adjacent incidences of one laser shot were extended to 104 ns. Moreover, we applied the multi-pass Thomson scattering system with signal separation system to the electron temperature anisotropy measurement. No anisotropy was observed within the error bars in the initial experiment.
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Affiliation(s)
- Dechuan Qiu
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Takashi Minami
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shinichiro Kado
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shigeru Inagaki
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Chenyu Wang
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Ryo Matsutani
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shunsuke Toba
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Maoyuan Luo
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Pengfei Zhang
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Naoki Kenmochi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Shinsuke Ohshima
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shinji Kobayashi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Hiroyuki Okada
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Tohru Mizuuchi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shigeru Konoshima
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Ryo Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Kazunobu Nagasaki
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
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2
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Qiu D, Minami T, Kado S, Matsutani R, Toba Y, Kenmochi N, Takahashi C, Wang C, Luo M, Zhang P, Ohshima S, Kobayashi S, Okada H, Mizuuchi T, Konoshima S, Yasuhara R, Inagaki S, Nagasaki K. Design of a dual scattering angle multi-pass Thomson scattering system with signal separation function on Heliotron J. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:013503. [PMID: 36725559 DOI: 10.1063/5.0108664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Accepted: 12/09/2022] [Indexed: 06/18/2023]
Abstract
This paper proposes a design of dual scattering angles multi-path Thomson scattering system with a signal separation function to solve the overlapping phenomenon of scattered light signals and to increase the measurement accuracy for the investigation of anisotropic electron velocity distribution. Furthermore, an optical path design is proposed to demonstrate how overlapping scattered light signals can be separated by setting the optical path in a limited room with a compact layout, which makes the incident interval between two overlapping scattered light signals 1.7 times longer than that of our current system. The specific position of each optical component existing in the system is determined via a Gaussian beam analysis to avoid damage caused by overexpansion of spot size with the application of two cooperating image relay systems. Conversely, a polychromator is optimized by resetting the pass waveband of the interference filter combination to achieve high accuracy in electron temperature (Te) measurement corresponding to two scattering angles simultaneously.
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Affiliation(s)
- Dechuan Qiu
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Takashi Minami
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shinichiro Kado
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Ryo Matsutani
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Yusuke Toba
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Naoki Kenmochi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Chihiro Takahashi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Chenyu Wang
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Maoyuan Luo
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Pengfei Zhang
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shinsuke Ohshima
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shinji Kobayashi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Hiroyuki Okada
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Tohru Mizuuchi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Shigeru Konoshima
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Ryo Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Shigeru Inagaki
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
| | - Kazunobu Nagasaki
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
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3
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Yoshikawa M, Mouri T, Nakanishi H, Kohagura J, Shima Y, Sakamoto M, Nakashima Y, Ezumi N, Minami R, Yamada I, Yasuhara R, Funaba H, Minami T, Kenmochi N. Improvement in multipass Thomson scattering system comprising laser amplification system developed in GAMMA 10/PDX. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:033515. [PMID: 33820074 DOI: 10.1063/5.0040461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 02/13/2021] [Indexed: 06/12/2023]
Abstract
The multipass Thomson scattering (MPTS) technique is one of the most useful methods for measuring low-electron-density plasmas. The MPTS system increases Thomson scattering (TS) signal intensities by integrating all multipass (MP) signals and improving the TS time resolution by analyzing each pass signal. The fully coaxial MPTS system developed in GAMMA 10/potential-control and diverter-simulator experiments has a polarization-based configuration with image-relaying optics. The MPTS system can enhance Thomson scattered signals for improving the measurement accuracy and megahertz-order time resolution. In this study, we develop a new MPTS system comprising a laser amplification system to obtain continuous MP signals. The laser amplification system can improve degraded laser power and return an amplified laser to the MP system. We obtain continuous MP signals from the laser amplification system by improving the laser beam profile adjuster in gas scattering experiments. Moreover, we demonstrate that more MP signals and stronger amplified MP signals can be achieved via multiple laser injections to the laser amplification system in the developed MP system comprising a laser amplification system.
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Affiliation(s)
- M Yoshikawa
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - T Mouri
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - H Nakanishi
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - J Kohagura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Shima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - M Sakamoto
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Nakashima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - N Ezumi
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - R Minami
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - I Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - R Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - H Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - T Minami
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - N Kenmochi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
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4
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Yoshikawa M, Kohagura J, Chikatsu M, Shima Y, Sakamoto M, Nakashima Y, Ezumi N, Minami R, Yasuhara R, Yamada I, Funaba H, Minami T, Kenmochi N. Development of a laser amplification system for the multi-pass Thomson scattering system for GAMMA 10/PDX. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10C102. [PMID: 30399870 DOI: 10.1063/1.5032224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The multi-pass Thomson scattering (MPTS) system is a useful technique for increasing the Thomson scattering (TS) signal intensities and improving the TS diagnostic time resolution. The MPTS system developed in GAMMA 10/PDX has a polarization-based configuration with an image relaying system. The MPTS system has been constructed for enhancing the Thomson scattered signals for the improvement of measurement accuracy and the megahertz sampling time resolution. However, in the normal MPTS system, the MPTS signal intensities decrease with the pass number because of the damping due to the optical components. Subsequently, we have developed a new MPTS system with the laser amplification system. The laser amplification system can improve the degraded laser power after six passes in the multi-pass system to the initial laser power. For the first time worldwide, we successfully obtained the continued multi-pass signals after the laser amplification system in the gas scattering experiments.
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Affiliation(s)
- M Yoshikawa
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - J Kohagura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - M Chikatsu
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Shima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - M Sakamoto
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Nakashima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - N Ezumi
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - R Minami
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - R Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - I Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - H Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - T Minami
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - N Kenmochi
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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5
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Imai T, Ichimura M, Nakashima Y, Sakamoto M, Katanuma I, Yoshikawa M, Kariya T, Hirata M, Kohagura J, Minami R, Numakura T, Ikezoe R, Oki K, Sakamoto K. GAMMA 10/PDX Project Status and Future. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst13-1t29] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Imai
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - M. Sakamoto
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - I. Katanuma
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - T. Kariya
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - M. Hirata
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - J. Kohagura
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - R. Minami
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - T. Numakura
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - R. Ikezoe
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - K. Oki
- Plasma Research Center, University of Tsukuba, 305-8577 Tsukuba, Japan
| | - K. Sakamoto
- Japan Atomic Energy Research Institute(JAEA), Naka, Japan
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6
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Yoshikawa M, Yasuhara R, Ohta K, Chikatsu M, Shima Y, Kohagura J, Sakamoto M, Nakashima Y, Imai T, Ichimura M, Yamada I, Funaba H, Minami T. High time resolved electron temperature measurements by using the multi-pass Thomson scattering system in GAMMA 10/PDX. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D617. [PMID: 27910509 DOI: 10.1063/1.4955287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
High time resolved electron temperature measurements are useful for fluctuation study. A multi-pass Thomson scattering (MPTS) system is proposed for the improvement of both increasing the TS signal intensity and time resolution. The MPTS system in GAMMA 10/PDX has been constructed for enhancing the Thomson scattered signals for the improvement of measurement accuracy. The MPTS system has a polarization-based configuration with an image relaying system. We optimized the image relaying optics for improving the multi-pass laser confinement and obtaining the stable MPTS signals over ten passing TS signals. The integrated MPTS signals increased about five times larger than that in the single pass system. Finally, time dependent electron temperatures were obtained in MHz sampling.
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Affiliation(s)
- Masayuki Yoshikawa
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Ryo Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Koichi Ohta
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Masayuki Chikatsu
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Yoriko Shima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Junko Kohagura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Mizuki Sakamoto
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Yousuke Nakashima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tsuyoshi Imai
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Makoto Ichimura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Ichihiro Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Hisamichi Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Takashi Minami
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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7
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Yoshikawa M, Wang X, Morishita M, Shima Y, Chikatsu M, Kohagura J, Sakamoto M, Minami R, Iso M, Nakashima Y, Imai T, Ichimura M, Yasuhara R, Yamada I, Funaba H, Minami T. Development of Thomson Scattering System in GAMMA 10. FUSION SCIENCE AND TECHNOLOGY 2015. [DOI: 10.13182/fst14-845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masayuki Yoshikawa
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Xiaolong Wang
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Masahiro Morishita
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Yoriko Shima
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Masayuki Chikatsu
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Junko Kohagura
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Mizuki Sakamoto
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Ryutaro Minami
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Masaki Iso
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Yousuke Nakashima
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Tsuyoshi Imai
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Makoto Ichimura
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Ryo Yasuhara
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Ichihiro Yamada
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Hisamichi Funaba
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Takashi Minami
- Kyoto University, Institute of Advanced Energy, Uji, Kyoto 611-0011, Japan
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8
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Yoshikawa M, Yasuhara R, Nagasu K, Shimamura Y, Shima Y, Kohagura J, Sakamoto M, Nakashima Y, Imai T, Ichimura M, Yamada I, Funaba H, Kawahata K, Minami T. First results of electron temperature measurements by the use of multi-pass Thomson scattering system in GAMMA 10. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D801. [PMID: 25430214 DOI: 10.1063/1.4885542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A multi-pass Thomson scattering (TS) has the advantage of enhancing scattered signals. We constructed a multi-pass TS system for a polarisation-based system and an image relaying system modelled on the GAMMA 10 TS system. We undertook Raman scattering experiments both for the multi-pass setting and for checking the optical components. Moreover, we applied the system to the electron temperature measurements in the GAMMA 10 plasma for the first time. The integrated scattering signal was magnified by approximately three times by using the multi-pass TS system with four passes. The electron temperature measurement accuracy is improved by using this multi-pass system.
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Affiliation(s)
- M Yoshikawa
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - R Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - K Nagasu
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Shimamura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Shima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - J Kohagura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - M Sakamoto
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y Nakashima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - T Imai
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - M Ichimura
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - I Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - H Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - K Kawahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - T Minami
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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9
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Yasuhara R, Yoshikawa M, Yamada I, Kawahata K, Funaba H, Sakamoto M, Nakashima Y, Imai T. Design of the Photon Recycling Probe Laser for the Divertor Thomson Scattering System in GAMMA 10. FUSION SCIENCE AND TECHNOLOGY 2013. [DOI: 10.13182/fst13-a16970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R. Yasuhara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - I. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - K. Kawahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - M. Sakamoto
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Imai
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
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10
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Yamada I, Narihara K, Funaba H, Yasuhara R, Hayashi H, Kohmoto T. Extension of the measurable temperature range of the LHD Thomson scattering system. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:10E340. [PMID: 23126998 DOI: 10.1063/1.4740525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The large helical device Thomson scattering system was designed for the target electron temperature (T(e)) range, T(e) = 50 eV-10 keV. Above 10 keV, the experimental error becomes rapidly worse. In order to obtain reliable T(e) data in the temperature range above 10 keV, we are planning to extend the measurable T(e) range by following two methods. First we have installed one more wavelength channel that observes shorter wavelength region in polychromators. Next applying forward scattering configuration is another candidate. We estimate the data quality when the two methods are used. Both of the two methods are expected to improve T(e) data quality at T(e) ≥ 10 keV.
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Affiliation(s)
- I Yamada
- National Institute for Fusion Science, Toki, Gifu, Japan.
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