We have investigated the generation region of intermittent plasma structures, which could be due to the blob-like cross field transport around the divertor simulation experimental module (D-module) in the tandem mirror device GAMMA 10/PDX. A positive skewness of the ion saturation current was clearly seen when the electrode of the movable probe was located at the radial edge and just in front of the entrance limiter of the D-module. Fourier analysis and conditional averaging clarified that positive spikes intermittently appeared in the same region. This is the first indication that the phenomenon producing the high-density isolated plasma structures occurred in the upstream of the D-module. A negative skewness was also found, and large amplitude fluctuation was detected between regions showing positive and negative skewness. Furthermore, this and light emission fluctuations become stronger during the transient state from attached to detached state on the V-shaped target.
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March 2023
Research Article|
March 01 2023
Study of the intermittent plasma structure around the divertor simulation experimental module in GAMMA 10/PDX
H. Tanaka
;
H. Tanaka
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing)
1
Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
2
Graduate School of Engineering, Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
a)Author to whom correspondence should be addressed: [email protected]
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N. Ezumi
;
N. Ezumi
(Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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T. Sugiyama
;
T. Sugiyama
b)
(Data curation, Formal analysis, Investigation)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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H. Gamo
;
H. Gamo
(Data curation, Investigation)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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N. Shigematsu;
N. Shigematsu
(Data curation, Formal analysis, Investigation)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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M. Yoshikawa
;
M. Yoshikawa
(Investigation, Resources, Writing – review & editing)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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J. Kohagura
;
J. Kohagura
(Investigation, Resources)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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M. Hirata
;
M. Hirata
(Investigation, Resources)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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S. Togo
;
S. Togo
(Writing – review & editing)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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N. Ohno
;
N. Ohno
(Project administration, Supervision, Writing – review & editing)
1
Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
2
Graduate School of Engineering, Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
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M. Sakamoto
M. Sakamoto
(Funding acquisition, Project administration, Resources, Supervision, Writing – review & editing)
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
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H. Tanaka
1,2,a)
N. Ezumi
3
T. Sugiyama
3,b)
H. Gamo
3
N. Shigematsu
3
M. Yoshikawa
3
J. Kohagura
3
M. Hirata
3
S. Togo
3
N. Ohno
1,2
M. Sakamoto
3
1
Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
2
Graduate School of Engineering, Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
3
Plasma Research Center, University of Tsukuba
, 1-1-1 Tenno-dai-cho, Tsukuba 305-8577, Japan
a)Author to whom correspondence should be addressed: [email protected]
b)
Present address: The Graduate University for Advanced Studies, SOKENDAI, Toki, Japan.
Phys. Plasmas 30, 032501 (2023)
Article history
Received:
October 07 2022
Accepted:
February 07 2023
Citation
H. Tanaka, N. Ezumi, T. Sugiyama, H. Gamo, N. Shigematsu, M. Yoshikawa, J. Kohagura, M. Hirata, S. Togo, N. Ohno, M. Sakamoto; Study of the intermittent plasma structure around the divertor simulation experimental module in GAMMA 10/PDX. Phys. Plasmas 1 March 2023; 30 (3): 032501. https://doi.org/10.1063/5.0129886
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