Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD

Hisamichi Funaba, Nobuyoshi Ohyabu, Yasuhiko Takeiri, Kiyomasa Watanabe, Shin Kubo, Takashi Shimozuma, Katsumi Ida, Junichi Miyazawa, Ryuichi Sakamoto, Kenichi Nagaoka, Kenji Tanaka, Byron Jay Peterson, Masaki Osakabe, Yoshio Nagayama, Inagaki Shigeru, Yoshiro Narushima, Satoru Sakakibara, Sadayoshi Murakami

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.

Original languageEnglish
Pages (from-to)262-270
Number of pages9
JournalFusion Science and Technology
Volume46
Issue number2
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

Fingerprint

beam injection
neutral beams
counters
Thermal diffusivity
Electron temperature
Plasmas
configurations
electrons
Electrons
Plasma density
flattening
thermal diffusivity
temperature profiles
Heating
electron energy
Electron Transport
plasma density
diffusivity
heating

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD. / Funaba, Hisamichi; Ohyabu, Nobuyoshi; Takeiri, Yasuhiko; Watanabe, Kiyomasa; Kubo, Shin; Shimozuma, Takashi; Ida, Katsumi; Miyazawa, Junichi; Sakamoto, Ryuichi; Nagaoka, Kenichi; Tanaka, Kenji; Peterson, Byron Jay; Osakabe, Masaki; Nagayama, Yoshio; Shigeru, Inagaki; Narushima, Yoshiro; Sakakibara, Satoru; Murakami, Sadayoshi.

In: Fusion Science and Technology, Vol. 46, No. 2, 01.01.2004, p. 262-270.

Research output: Contribution to journalArticle

Funaba, H, Ohyabu, N, Takeiri, Y, Watanabe, K, Kubo, S, Shimozuma, T, Ida, K, Miyazawa, J, Sakamoto, R, Nagaoka, K, Tanaka, K, Peterson, BJ, Osakabe, M, Nagayama, Y, Shigeru, I, Narushima, Y, Sakakibara, S & Murakami, S 2004, 'Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD', Fusion Science and Technology, vol. 46, no. 2, pp. 262-270. https://doi.org/10.13182/FST04-A564
Funaba, Hisamichi ; Ohyabu, Nobuyoshi ; Takeiri, Yasuhiko ; Watanabe, Kiyomasa ; Kubo, Shin ; Shimozuma, Takashi ; Ida, Katsumi ; Miyazawa, Junichi ; Sakamoto, Ryuichi ; Nagaoka, Kenichi ; Tanaka, Kenji ; Peterson, Byron Jay ; Osakabe, Masaki ; Nagayama, Yoshio ; Shigeru, Inagaki ; Narushima, Yoshiro ; Sakakibara, Satoru ; Murakami, Sadayoshi. / Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD. In: Fusion Science and Technology. 2004 ; Vol. 46, No. 2. pp. 262-270.
@article{b9e32e1e402b4c92a4c0018f8a0c34d9,
title = "Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD",
abstract = "In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.",
author = "Hisamichi Funaba and Nobuyoshi Ohyabu and Yasuhiko Takeiri and Kiyomasa Watanabe and Shin Kubo and Takashi Shimozuma and Katsumi Ida and Junichi Miyazawa and Ryuichi Sakamoto and Kenichi Nagaoka and Kenji Tanaka and Peterson, {Byron Jay} and Masaki Osakabe and Yoshio Nagayama and Inagaki Shigeru and Yoshiro Narushima and Satoru Sakakibara and Sadayoshi Murakami",
year = "2004",
month = "1",
day = "1",
doi = "10.13182/FST04-A564",
language = "English",
volume = "46",
pages = "262--270",
journal = "Fusion Science and Technology",
issn = "1536-1055",
publisher = "American Nuclear Society",
number = "2",

}

TY - JOUR

T1 - Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD

AU - Funaba, Hisamichi

AU - Ohyabu, Nobuyoshi

AU - Takeiri, Yasuhiko

AU - Watanabe, Kiyomasa

AU - Kubo, Shin

AU - Shimozuma, Takashi

AU - Ida, Katsumi

AU - Miyazawa, Junichi

AU - Sakamoto, Ryuichi

AU - Nagaoka, Kenichi

AU - Tanaka, Kenji

AU - Peterson, Byron Jay

AU - Osakabe, Masaki

AU - Nagayama, Yoshio

AU - Shigeru, Inagaki

AU - Narushima, Yoshiro

AU - Sakakibara, Satoru

AU - Murakami, Sadayoshi

PY - 2004/1/1

Y1 - 2004/1/1

N2 - In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.

AB - In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.

UR - http://www.scopus.com/inward/record.url?scp=6444226004&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=6444226004&partnerID=8YFLogxK

U2 - 10.13182/FST04-A564

DO - 10.13182/FST04-A564

M3 - Article

AN - SCOPUS:6444226004

VL - 46

SP - 262

EP - 270

JO - Fusion Science and Technology

JF - Fusion Science and Technology

SN - 1536-1055

IS - 2

ER -