Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS

Takashi Minami, Shoichi Okamura, Chihiro Suzuki, Keiji Matsuo, Tetsutarou Oishi, Tsuyoshi Akiyama, Mitsutaka Isobe, Katsumi Ida, Haruhisa Nakano, akihide fujisawa, Kenichi Nagaoka, Mikiro Yoshinuma, Yasuo Yoshimura, Kazuo Toi, Shinsuke Ohshima, Masaki Takeuchi, Harukazu Iguchi, Shin Nishimura, Akihiro Shimizu, Keisuke Matsuoka & 1 others Chihiro Takahashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An edge transport barrier (ETB) formation and an improved L-mode (IL mode) have been simultaneously realized in the high density region (n̄ e ∼ 1.2 × 10 20 m ?3 ) on the Compact Helical System (CHS). When the ETB is formed during the IL mode, the density reduction in the edge region is suppressed by the barrier formation. As a result of the continuous increase in the temperature by the IL mode, the stored energy during the combined mode increased up to the maximum stored energy (W p ∼ 9.4 kJ) recorded in the CHS experiments. The plasma pressure in the peripheral region increases up to three times compared with the L-mode, and the large edge plasma pressure gradient is formed accompanying the pedestal structure. This is caused by the anomalous transport reduction that is confirmed by the sharp drop in the density fluctuation in the edge region. The neutral particle density reduction in the peripheral region and the metallic impurity accumulation in the core plasma are simultaneously observed during the high density ETB formation.

Original languageEnglish
Article number085018
JournalNuclear Fusion
Volume49
Issue number8
DOIs
Publication statusPublished - Sep 21 2009

Fingerprint

plasma pressure
neutral particles
pressure gradients
impurities
energy
temperature

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Minami, T., Okamura, S., Suzuki, C., Matsuo, K., Oishi, T., Akiyama, T., ... Takahashi, C. (2009). Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS. Nuclear Fusion, 49(8), [085018]. https://doi.org/10.1088/0029-5515/49/8/085018

Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS. / Minami, Takashi; Okamura, Shoichi; Suzuki, Chihiro; Matsuo, Keiji; Oishi, Tetsutarou; Akiyama, Tsuyoshi; Isobe, Mitsutaka; Ida, Katsumi; Nakano, Haruhisa; fujisawa, akihide; Nagaoka, Kenichi; Yoshinuma, Mikiro; Yoshimura, Yasuo; Toi, Kazuo; Ohshima, Shinsuke; Takeuchi, Masaki; Iguchi, Harukazu; Nishimura, Shin; Shimizu, Akihiro; Matsuoka, Keisuke; Takahashi, Chihiro.

In: Nuclear Fusion, Vol. 49, No. 8, 085018, 21.09.2009.

Research output: Contribution to journalArticle

Minami, T, Okamura, S, Suzuki, C, Matsuo, K, Oishi, T, Akiyama, T, Isobe, M, Ida, K, Nakano, H, fujisawa, A, Nagaoka, K, Yoshinuma, M, Yoshimura, Y, Toi, K, Ohshima, S, Takeuchi, M, Iguchi, H, Nishimura, S, Shimizu, A, Matsuoka, K & Takahashi, C 2009, 'Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS', Nuclear Fusion, vol. 49, no. 8, 085018. https://doi.org/10.1088/0029-5515/49/8/085018
Minami, Takashi ; Okamura, Shoichi ; Suzuki, Chihiro ; Matsuo, Keiji ; Oishi, Tetsutarou ; Akiyama, Tsuyoshi ; Isobe, Mitsutaka ; Ida, Katsumi ; Nakano, Haruhisa ; fujisawa, akihide ; Nagaoka, Kenichi ; Yoshinuma, Mikiro ; Yoshimura, Yasuo ; Toi, Kazuo ; Ohshima, Shinsuke ; Takeuchi, Masaki ; Iguchi, Harukazu ; Nishimura, Shin ; Shimizu, Akihiro ; Matsuoka, Keisuke ; Takahashi, Chihiro. / Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS. In: Nuclear Fusion. 2009 ; Vol. 49, No. 8.
@article{8532225795594126ae46c24d9121512f,
title = "Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS",
abstract = "An edge transport barrier (ETB) formation and an improved L-mode (IL mode) have been simultaneously realized in the high density region (n̄ e ∼ 1.2 × 10 20 m ?3 ) on the Compact Helical System (CHS). When the ETB is formed during the IL mode, the density reduction in the edge region is suppressed by the barrier formation. As a result of the continuous increase in the temperature by the IL mode, the stored energy during the combined mode increased up to the maximum stored energy (W p ∼ 9.4 kJ) recorded in the CHS experiments. The plasma pressure in the peripheral region increases up to three times compared with the L-mode, and the large edge plasma pressure gradient is formed accompanying the pedestal structure. This is caused by the anomalous transport reduction that is confirmed by the sharp drop in the density fluctuation in the edge region. The neutral particle density reduction in the peripheral region and the metallic impurity accumulation in the core plasma are simultaneously observed during the high density ETB formation.",
author = "Takashi Minami and Shoichi Okamura and Chihiro Suzuki and Keiji Matsuo and Tetsutarou Oishi and Tsuyoshi Akiyama and Mitsutaka Isobe and Katsumi Ida and Haruhisa Nakano and akihide fujisawa and Kenichi Nagaoka and Mikiro Yoshinuma and Yasuo Yoshimura and Kazuo Toi and Shinsuke Ohshima and Masaki Takeuchi and Harukazu Iguchi and Shin Nishimura and Akihiro Shimizu and Keisuke Matsuoka and Chihiro Takahashi",
year = "2009",
month = "9",
day = "21",
doi = "10.1088/0029-5515/49/8/085018",
language = "English",
volume = "49",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "IOP Publishing Ltd.",
number = "8",

}

TY - JOUR

T1 - Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS

AU - Minami, Takashi

AU - Okamura, Shoichi

AU - Suzuki, Chihiro

AU - Matsuo, Keiji

AU - Oishi, Tetsutarou

AU - Akiyama, Tsuyoshi

AU - Isobe, Mitsutaka

AU - Ida, Katsumi

AU - Nakano, Haruhisa

AU - fujisawa, akihide

AU - Nagaoka, Kenichi

AU - Yoshinuma, Mikiro

AU - Yoshimura, Yasuo

AU - Toi, Kazuo

AU - Ohshima, Shinsuke

AU - Takeuchi, Masaki

AU - Iguchi, Harukazu

AU - Nishimura, Shin

AU - Shimizu, Akihiro

AU - Matsuoka, Keisuke

AU - Takahashi, Chihiro

PY - 2009/9/21

Y1 - 2009/9/21

N2 - An edge transport barrier (ETB) formation and an improved L-mode (IL mode) have been simultaneously realized in the high density region (n̄ e ∼ 1.2 × 10 20 m ?3 ) on the Compact Helical System (CHS). When the ETB is formed during the IL mode, the density reduction in the edge region is suppressed by the barrier formation. As a result of the continuous increase in the temperature by the IL mode, the stored energy during the combined mode increased up to the maximum stored energy (W p ∼ 9.4 kJ) recorded in the CHS experiments. The plasma pressure in the peripheral region increases up to three times compared with the L-mode, and the large edge plasma pressure gradient is formed accompanying the pedestal structure. This is caused by the anomalous transport reduction that is confirmed by the sharp drop in the density fluctuation in the edge region. The neutral particle density reduction in the peripheral region and the metallic impurity accumulation in the core plasma are simultaneously observed during the high density ETB formation.

AB - An edge transport barrier (ETB) formation and an improved L-mode (IL mode) have been simultaneously realized in the high density region (n̄ e ∼ 1.2 × 10 20 m ?3 ) on the Compact Helical System (CHS). When the ETB is formed during the IL mode, the density reduction in the edge region is suppressed by the barrier formation. As a result of the continuous increase in the temperature by the IL mode, the stored energy during the combined mode increased up to the maximum stored energy (W p ∼ 9.4 kJ) recorded in the CHS experiments. The plasma pressure in the peripheral region increases up to three times compared with the L-mode, and the large edge plasma pressure gradient is formed accompanying the pedestal structure. This is caused by the anomalous transport reduction that is confirmed by the sharp drop in the density fluctuation in the edge region. The neutral particle density reduction in the peripheral region and the metallic impurity accumulation in the core plasma are simultaneously observed during the high density ETB formation.

UR - http://www.scopus.com/inward/record.url?scp=70349130371&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70349130371&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/49/8/085018

DO - 10.1088/0029-5515/49/8/085018

M3 - Article

VL - 49

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 8

M1 - 085018

ER -