High beta discharges with neutral beam injection in CHS

S. Okamura; K. Matsuoka; K. Nishimura; K. Tsumori; R. Akiyama; S. Sakakibara; H. Yamada; S. Morita; T. Morisaki; N. Nakajima; K. Tanaka; J. Xu; K. Ida; H. Iguchi; A. Lazaros; T. Ozaki; H. Arimoto; A. Ejiri; M. Fujiwara; H. Idei; O. Kaneko; K. Kawahata; T. Kawamoto; A. Komori; S. Kubo; O. Motojima; V. D. Pustovitov; C. Takahashi; K. Toi; I. Yamada

doi:10.1088/0029-5515/35/3/I03

High beta discharges with neutral beam injection in CHS

S. Okamura, K. Matsuoka, K. Nishimura, K. Tsumori, R. Akiyama, S. Sakakibara, H. Yamada, S. Morita, T. Morisaki, N. Nakajima, K. Tanaka, J. Xu, K. Ida, H. Iguchi, A. Lazaros, T. Ozaki, H. Arimoto, A. Ejiri, M. Fujiwara, H. IdeiO. Kaneko, K. Kawahata, T. Kawamoto, A. Komori, S. Kubo, O. Motojima, V. D. Pustovitov, C. Takahashi, K. Toi, I. Yamada

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

5 Citations (Scopus)

Abstract

High beta plasmas with a volume averaged equilibrium beta value of 2.1% were produced in CHS using tangential neutral beam injection. This beta value was achieved with the confinement improvement (reheat mode) observed after turning off strong gas puffing. Wall conditioning with titanium gettering was used to make high density operation (n_e ≤ 8 × 10 ¹⁹ m^-3) possible for low magnetic fields (B_t = 0.6 T). The discharges start with the magnetic hill configuration (in vacuum) and finally achieve Mercier stable equilibrium owing to the self-stabilization effect given by the magnetic well which is produced by the plasma pressure. The Shafranov shift was about 40% of a plasma minor radius. Magnetic fluctuations did not increase with increasing plasma pressure when the beta value exceeded 1%. Dynamic poloidal field control was applied to suppress the outward plasma shift with increasing plasma pressure. Such operation gave an additional increase of beta value compared with the constant poloidal field operation.

Original language	English
Article number	I03
Pages (from-to)	283-296
Number of pages	14
Journal	Nuclear Fusion
Volume	35
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/35/3/I03
Publication status	Published - Dec 1 1995
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

Access to Document

10.1088/0029-5515/35/3/I03

Cite this

Okamura, S., Matsuoka, K., Nishimura, K., Tsumori, K., Akiyama, R., Sakakibara, S., Yamada, H., Morita, S., Morisaki, T., Nakajima, N., Tanaka, K., Xu, J., Ida, K., Iguchi, H., Lazaros, A., Ozaki, T., Arimoto, H., Ejiri, A., Fujiwara, M., ... Yamada, I. (1995). High beta discharges with neutral beam injection in CHS. Nuclear Fusion, 35(3), 283-296. [I03]. https://doi.org/10.1088/0029-5515/35/3/I03

Okamura, S, Matsuoka, K, Nishimura, K, Tsumori, K, Akiyama, R, Sakakibara, S, Yamada, H, Morita, S, Morisaki, T, Nakajima, N, Tanaka, K, Xu, J, Ida, K, Iguchi, H, Lazaros, A, Ozaki, T, Arimoto, H, Ejiri, A, Fujiwara, M, Idei, H, Kaneko, O, Kawahata, K, Kawamoto, T, Komori, A, Kubo, S, Motojima, O, Pustovitov, VD, Takahashi, C, Toi, K & Yamada, I 1995, 'High beta discharges with neutral beam injection in CHS', Nuclear Fusion, vol. 35, no. 3, I03, pp. 283-296. https://doi.org/10.1088/0029-5515/35/3/I03

@article{1614e86994af467c83ec940a89bc1f9e,

title = "High beta discharges with neutral beam injection in CHS",

abstract = "High beta plasmas with a volume averaged equilibrium beta value of 2.1% were produced in CHS using tangential neutral beam injection. This beta value was achieved with the confinement improvement (reheat mode) observed after turning off strong gas puffing. Wall conditioning with titanium gettering was used to make high density operation (ne ≤ 8 × 10 19 m-3) possible for low magnetic fields (Bt = 0.6 T). The discharges start with the magnetic hill configuration (in vacuum) and finally achieve Mercier stable equilibrium owing to the self-stabilization effect given by the magnetic well which is produced by the plasma pressure. The Shafranov shift was about 40% of a plasma minor radius. Magnetic fluctuations did not increase with increasing plasma pressure when the beta value exceeded 1%. Dynamic poloidal field control was applied to suppress the outward plasma shift with increasing plasma pressure. Such operation gave an additional increase of beta value compared with the constant poloidal field operation.",

author = "S. Okamura and K. Matsuoka and K. Nishimura and K. Tsumori and R. Akiyama and S. Sakakibara and H. Yamada and S. Morita and T. Morisaki and N. Nakajima and K. Tanaka and J. Xu and K. Ida and H. Iguchi and A. Lazaros and T. Ozaki and H. Arimoto and A. Ejiri and M. Fujiwara and H. Idei and O. Kaneko and K. Kawahata and T. Kawamoto and A. Komori and S. Kubo and O. Motojima and Pustovitov, {V. D.} and C. Takahashi and K. Toi and I. Yamada",

year = "1995",

month = dec,

day = "1",

doi = "10.1088/0029-5515/35/3/I03",

language = "English",

volume = "35",

pages = "283--296",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "3",

}

TY - JOUR

T1 - High beta discharges with neutral beam injection in CHS

AU - Okamura, S.

AU - Matsuoka, K.

AU - Nishimura, K.

AU - Tsumori, K.

AU - Akiyama, R.

AU - Sakakibara, S.

AU - Yamada, H.

AU - Morita, S.

AU - Morisaki, T.

AU - Nakajima, N.

AU - Tanaka, K.

AU - Xu, J.

AU - Ida, K.

AU - Iguchi, H.

AU - Lazaros, A.

AU - Ozaki, T.

AU - Arimoto, H.

AU - Ejiri, A.

AU - Fujiwara, M.

AU - Idei, H.

AU - Kaneko, O.

AU - Kawahata, K.

AU - Kawamoto, T.

AU - Komori, A.

AU - Kubo, S.

AU - Motojima, O.

AU - Pustovitov, V. D.

AU - Takahashi, C.

AU - Toi, K.

AU - Yamada, I.

PY - 1995/12/1

Y1 - 1995/12/1

N2 - High beta plasmas with a volume averaged equilibrium beta value of 2.1% were produced in CHS using tangential neutral beam injection. This beta value was achieved with the confinement improvement (reheat mode) observed after turning off strong gas puffing. Wall conditioning with titanium gettering was used to make high density operation (ne ≤ 8 × 10 19 m-3) possible for low magnetic fields (Bt = 0.6 T). The discharges start with the magnetic hill configuration (in vacuum) and finally achieve Mercier stable equilibrium owing to the self-stabilization effect given by the magnetic well which is produced by the plasma pressure. The Shafranov shift was about 40% of a plasma minor radius. Magnetic fluctuations did not increase with increasing plasma pressure when the beta value exceeded 1%. Dynamic poloidal field control was applied to suppress the outward plasma shift with increasing plasma pressure. Such operation gave an additional increase of beta value compared with the constant poloidal field operation.

AB - High beta plasmas with a volume averaged equilibrium beta value of 2.1% were produced in CHS using tangential neutral beam injection. This beta value was achieved with the confinement improvement (reheat mode) observed after turning off strong gas puffing. Wall conditioning with titanium gettering was used to make high density operation (ne ≤ 8 × 10 19 m-3) possible for low magnetic fields (Bt = 0.6 T). The discharges start with the magnetic hill configuration (in vacuum) and finally achieve Mercier stable equilibrium owing to the self-stabilization effect given by the magnetic well which is produced by the plasma pressure. The Shafranov shift was about 40% of a plasma minor radius. Magnetic fluctuations did not increase with increasing plasma pressure when the beta value exceeded 1%. Dynamic poloidal field control was applied to suppress the outward plasma shift with increasing plasma pressure. Such operation gave an additional increase of beta value compared with the constant poloidal field operation.

UR - http://www.scopus.com/inward/record.url?scp=0000133562&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000133562&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/35/3/I03

DO - 10.1088/0029-5515/35/3/I03

M3 - Article

AN - SCOPUS:0000133562

SN - 0029-5515

VL - 35

SP - 283

EP - 296

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

M1 - I03

ER -

High beta discharges with neutral beam injection in CHS

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this