Experimental evaluation of fractional abundance data for W23+-W28+

Keisuke Fujii; Daiji Kato; Nobuyuki Nakamura; Motoshi Goto; Shigeru Morita; Masahiro Hasuo

doi:10.1088/1361-6455/50/5/055004

Experimental evaluation of fractional abundance data for W²³⁺-W²⁸⁺

Keisuke Fujii, Daiji Kato, Nobuyuki Nakamura, Motoshi Goto, Shigeru Morita, Masahiro Hasuo

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

6 Scopus citations

Abstract

Based on the electron temperature (T _e) dependence of 20 forbidden tungsten line intensities observed in several Large Helical Device discharges, we experimentally evaluated fractional abundance profiles for highly charged tungsten ions (W) in the charge states 23-28. Although the absolute values of the fractional abundance are still inaccessible in our method, relative profiles against T _e values were evaluated. The T _e values at the profile peak for q = 23, 24, 25, 26, 27 and 28 states tungsten abundance were evaluated as 0.53, 0.58, 0.65, 0.78, 0.93, and 1.14 keV, respectively. These results were ≈20% smaller than those reported by Pütterich et al (2008 Plasma Phys. Control. Fusion 50 085016), which are the theoretical calculations adjusted to match the quasi-continuum emission by 24-35 tungsten ions measured in the extreme ultraviolet region, and ≈60% larger than the pure theoretical calculation by Sasaki et al (2013 J. Phys. B: At. Mol. Opt. Phys. 46 175701).

Original language	English
Article number	055004
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	50
Issue number	5
DOIs	https://doi.org/10.1088/1361-6455/50/5/055004
State	Published - Feb 14 2017
Externally published	Yes

Funding

Part of this work was supported by JSPS KAKENHI Grant Number 26610191, the National Institute for Fusion Science (NIFS14KLPH023, NIFS13KLPF032), and the JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC: No.11261140328, NRF:2012K2A2A6000443). DK is grateful for the support of JSPS KAKENHI Grants No. 15H04235.

Funders	Funder number
JSPS-NRF-NSFC
Princeton Plasma Physics Laboratory
National Research Foundation	K2A2A6000443
Japan Society for the Promotion of Science	15H04235, 26610191, 16H04088
National Natural Science Foundation of China	11261140328
National Institute for Fusion Science	NIFS14KLPH023, NIFS13KLPF032

Keywords

Bayesian inference
forbidden line
inverse problem
spectroscopy

Access to Document

10.1088/1361-6455/50/5/055004

Cite this

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title = "Experimental evaluation of fractional abundance data for W23+-W28+",

abstract = "Based on the electron temperature (T e) dependence of 20 forbidden tungsten line intensities observed in several Large Helical Device discharges, we experimentally evaluated fractional abundance profiles for highly charged tungsten ions (W) in the charge states 23-28. Although the absolute values of the fractional abundance are still inaccessible in our method, relative profiles against T e values were evaluated. The T e values at the profile peak for q = 23, 24, 25, 26, 27 and 28 states tungsten abundance were evaluated as 0.53, 0.58, 0.65, 0.78, 0.93, and 1.14 keV, respectively. These results were ≈20% smaller than those reported by P{\"u}tterich et al (2008 Plasma Phys. Control. Fusion 50 085016), which are the theoretical calculations adjusted to match the quasi-continuum emission by 24-35 tungsten ions measured in the extreme ultraviolet region, and ≈60% larger than the pure theoretical calculation by Sasaki et al (2013 J. Phys. B: At. Mol. Opt. Phys. 46 175701).",

keywords = "Bayesian inference, forbidden line, inverse problem, spectroscopy",

author = "Keisuke Fujii and Daiji Kato and Nobuyuki Nakamura and Motoshi Goto and Shigeru Morita and Masahiro Hasuo",

note = "Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",

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month = feb,

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doi = "10.1088/1361-6455/50/5/055004",

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T1 - Experimental evaluation of fractional abundance data for W23+-W28+

AU - Fujii, Keisuke

AU - Kato, Daiji

AU - Nakamura, Nobuyuki

AU - Goto, Motoshi

AU - Morita, Shigeru

AU - Hasuo, Masahiro

PY - 2017/2/14

Y1 - 2017/2/14

N2 - Based on the electron temperature (T e) dependence of 20 forbidden tungsten line intensities observed in several Large Helical Device discharges, we experimentally evaluated fractional abundance profiles for highly charged tungsten ions (W) in the charge states 23-28. Although the absolute values of the fractional abundance are still inaccessible in our method, relative profiles against T e values were evaluated. The T e values at the profile peak for q = 23, 24, 25, 26, 27 and 28 states tungsten abundance were evaluated as 0.53, 0.58, 0.65, 0.78, 0.93, and 1.14 keV, respectively. These results were ≈20% smaller than those reported by Pütterich et al (2008 Plasma Phys. Control. Fusion 50 085016), which are the theoretical calculations adjusted to match the quasi-continuum emission by 24-35 tungsten ions measured in the extreme ultraviolet region, and ≈60% larger than the pure theoretical calculation by Sasaki et al (2013 J. Phys. B: At. Mol. Opt. Phys. 46 175701).

AB - Based on the electron temperature (T e) dependence of 20 forbidden tungsten line intensities observed in several Large Helical Device discharges, we experimentally evaluated fractional abundance profiles for highly charged tungsten ions (W) in the charge states 23-28. Although the absolute values of the fractional abundance are still inaccessible in our method, relative profiles against T e values were evaluated. The T e values at the profile peak for q = 23, 24, 25, 26, 27 and 28 states tungsten abundance were evaluated as 0.53, 0.58, 0.65, 0.78, 0.93, and 1.14 keV, respectively. These results were ≈20% smaller than those reported by Pütterich et al (2008 Plasma Phys. Control. Fusion 50 085016), which are the theoretical calculations adjusted to match the quasi-continuum emission by 24-35 tungsten ions measured in the extreme ultraviolet region, and ≈60% larger than the pure theoretical calculation by Sasaki et al (2013 J. Phys. B: At. Mol. Opt. Phys. 46 175701).

KW - Bayesian inference

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KW - inverse problem

KW - spectroscopy

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