Application of tomographic ion Doppler spectroscopy to merging plasma startup in the MAST spherical tokamak

Hiroshi Tanabe; Takuma Yamada; Takenori Watanabe; Keii Gi; Kazutake Kadowaki; Michiaki Inomoto; Ryota Imazawa; Mikhail Gryaznevich; Rory Scannell; Neil Conway; Brendan Crowley; Ken G. Mcclements; Ian Fitzgerald; Clive Michael; James Harrison; Alex Meakins; Nickhawkes; Thomas O'Gorman; Chio Zong Cheng; Yasushi Ono; The Mast Team

doi:10.1585/pfr.11.1302093

Application of tomographic ion Doppler spectroscopy to merging plasma startup in the MAST spherical tokamak

Hiroshi Tanabe, Takuma Yamada, Takenori Watanabe, Keii Gi, Kazutake Kadowaki, Michiaki Inomoto, Ryota Imazawa, Mikhail Gryaznevich, Rory Scannell, Neil Conway, Brendan Crowley, Ken G. Mcclements, Ian Fitzgerald, Clive Michael, James Harrison, Alex Meakins, Nickhawkes, Thomas O'Gorman, Chio Zong Cheng, Yasushi OnoThe Mast Team

Division for Experimental Natural Science

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

This paper describes recent advances in merging/reconnection experiments in MAST, namely tomographic ion Doppler spectroscopy capability from 2013 which solves the problem of the absence of ion temperature profile measurement during the solenoid-less startup. Providing 32 channel line-integrated spectra from 0.25m < r_tangential < 1.1m are connected to a grating spectrometer with the focal length of 1.0m and grating frequency of 1800 L/mm, and tomographic reconstruction is applied to measure local ion temperature profile. This system successfully contributes to the study of ion heating during merging/reconnection startup and revealed that magnetic reconnection mostly heats ions in the downstream region of outflow jet and also found its contribution to bulk electron heating as well as the localized heating at X point with the time scale of energy relaxation between ions and electrons.

Original language	English
Article number	1302093
Journal	Plasma and Fusion Research
Volume	11
DOIs	https://doi.org/10.1585/pfr.11.1302093
Publication status	Published - 2016

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.11.1302093

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Tanabe, H., Yamada, T., Watanabe, T., Gi, K., Kadowaki, K., Inomoto, M., Imazawa, R., Gryaznevich, M., Scannell, R., Conway, N., Crowley, B., Mcclements, K. G., Fitzgerald, I., Michael, C., Harrison, J., Meakins, A., Nickhawkes, O'Gorman, T., Cheng, C. Z., ... Team, T. M. (2016). Application of tomographic ion Doppler spectroscopy to merging plasma startup in the MAST spherical tokamak. Plasma and Fusion Research, 11, Article 1302093. https://doi.org/10.1585/pfr.11.1302093

Tanabe, H, Yamada, T, Watanabe, T, Gi, K, Kadowaki, K, Inomoto, M, Imazawa, R, Gryaznevich, M, Scannell, R, Conway, N, Crowley, B, Mcclements, KG, Fitzgerald, I, Michael, C, Harrison, J, Meakins, A, Nickhawkes, O'Gorman, T, Cheng, CZ, Ono, Y & Team, TM 2016, 'Application of tomographic ion Doppler spectroscopy to merging plasma startup in the MAST spherical tokamak', Plasma and Fusion Research, vol. 11, 1302093. https://doi.org/10.1585/pfr.11.1302093

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title = "Application of tomographic ion Doppler spectroscopy to merging plasma startup in the MAST spherical tokamak",

abstract = "This paper describes recent advances in merging/reconnection experiments in MAST, namely tomographic ion Doppler spectroscopy capability from 2013 which solves the problem of the absence of ion temperature profile measurement during the solenoid-less startup. Providing 32 channel line-integrated spectra from 0.25m < rtangential < 1.1m are connected to a grating spectrometer with the focal length of 1.0m and grating frequency of 1800 L/mm, and tomographic reconstruction is applied to measure local ion temperature profile. This system successfully contributes to the study of ion heating during merging/reconnection startup and revealed that magnetic reconnection mostly heats ions in the downstream region of outflow jet and also found its contribution to bulk electron heating as well as the localized heating at X point with the time scale of energy relaxation between ions and electrons.",

author = "Hiroshi Tanabe and Takuma Yamada and Takenori Watanabe and Keii Gi and Kazutake Kadowaki and Michiaki Inomoto and Ryota Imazawa and Mikhail Gryaznevich and Rory Scannell and Neil Conway and Brendan Crowley and Mcclements, {Ken G.} and Ian Fitzgerald and Clive Michael and James Harrison and Alex Meakins and Nickhawkes and Thomas O'Gorman and Cheng, {Chio Zong} and Yasushi Ono and Team, {The Mast}",

note = "Publisher Copyright: {\textcopyright} 2017 The Japan Society of Plasma Science and Nuclear Fusion Research.",

year = "2016",

doi = "10.1585/pfr.11.1302093",

language = "English",

volume = "11",

journal = "Plasma and Fusion Research",

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AU - Tanabe, Hiroshi

AU - Yamada, Takuma

AU - Watanabe, Takenori

AU - Gi, Keii

AU - Kadowaki, Kazutake

AU - Inomoto, Michiaki

AU - Imazawa, Ryota

AU - Gryaznevich, Mikhail

AU - Scannell, Rory

AU - Conway, Neil

AU - Crowley, Brendan

AU - Mcclements, Ken G.

AU - Fitzgerald, Ian

AU - Michael, Clive

AU - Harrison, James

AU - Meakins, Alex

AU - Nickhawkes,

AU - O'Gorman, Thomas

AU - Cheng, Chio Zong

AU - Ono, Yasushi

AU - Team, The Mast

PY - 2016

Y1 - 2016

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AB - This paper describes recent advances in merging/reconnection experiments in MAST, namely tomographic ion Doppler spectroscopy capability from 2013 which solves the problem of the absence of ion temperature profile measurement during the solenoid-less startup. Providing 32 channel line-integrated spectra from 0.25m < rtangential < 1.1m are connected to a grating spectrometer with the focal length of 1.0m and grating frequency of 1800 L/mm, and tomographic reconstruction is applied to measure local ion temperature profile. This system successfully contributes to the study of ion heating during merging/reconnection startup and revealed that magnetic reconnection mostly heats ions in the downstream region of outflow jet and also found its contribution to bulk electron heating as well as the localized heating at X point with the time scale of energy relaxation between ions and electrons.

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JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

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ER -

Application of tomographic ion Doppler spectroscopy to merging plasma startup in the MAST spherical tokamak

Abstract

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