Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron

A. Fujisawa; H. Iguchi; H. Sanuki; K. Itoh; S. Lee; Y. Hamada; S. Kubo; H. Idei; T. P. Crowley; R. Akiyama; K. Tanaka; T. Minami; K. Ida; S. Nishimura; S. Morita; M. Kojima; S. Hidekuma; S. I. Itoh; C. Takahashi; N. Inoue; H. Suzuki; S. Okamura; K. Matsuoka

doi:10.1103/PhysRevLett.79.1054

Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron

A. Fujisawa, H. Iguchi, H. Sanuki, K. Itoh, S. Lee, Y. Hamada, S. Kubo, H. Idei, T. P. Crowley, R. Akiyama, K. Tanaka, T. Minami, K. Ida, S. Nishimura, S. Morita, M. Kojima, S. Hidekuma, S. I. Itoh, C. Takahashi, N. InoueH. Suzuki, S. Okamura, K. Matsuoka

Division of Nuclear Fusion Dynamics

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

52 Citations (Scopus)

Abstract

During combined electron cyclotron and neutral beam heating, an abrupt drop and rise in potential by about one half of the central electron temperature (400 V) was observed in the core of the compact helical system heliotron/torsatron plasma. Drastic changes of radial electric field between positive and negative states occur over periods as short as 60 μs, which is much shorter than the energy confinement time scale of about a few milliseconds. A nonlinear relation between the radial electric field and radial current is obtained. This is the first experimental observation of a microsecond time scale spontaneous transition based on an electric field bifurcation in toroidal helical plasmas.

Original language	English
Pages (from-to)	1054-1057
Number of pages	4
Journal	Physical review letters
Volume	79
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.79.1054
Publication status	Published - Jan 1 1997

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Access to Document

10.1103/PhysRevLett.79.1054

Cite this

Fujisawa, A., Iguchi, H., Sanuki, H., Itoh, K., Lee, S., Hamada, Y., Kubo, S., Idei, H., Crowley, T. P., Akiyama, R., Tanaka, K., Minami, T., Ida, K., Nishimura, S., Morita, S., Kojima, M., Hidekuma, S., Itoh, S. I., Takahashi, C., ... Matsuoka, K. (1997). Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron. Physical review letters, 79(6), 1054-1057. https://doi.org/10.1103/PhysRevLett.79.1054

Fujisawa, A, Iguchi, H, Sanuki, H, Itoh, K, Lee, S, Hamada, Y, Kubo, S, Idei, H, Crowley, TP, Akiyama, R, Tanaka, K, Minami, T, Ida, K, Nishimura, S, Morita, S, Kojima, M, Hidekuma, S, Itoh, SI, Takahashi, C, Inoue, N, Suzuki, H, Okamura, S & Matsuoka, K 1997, 'Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron', Physical review letters, vol. 79, no. 6, pp. 1054-1057. https://doi.org/10.1103/PhysRevLett.79.1054

@article{52c274722b5c4b59ba7a13c91fb92218,

title = "Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron",

abstract = "During combined electron cyclotron and neutral beam heating, an abrupt drop and rise in potential by about one half of the central electron temperature (400 V) was observed in the core of the compact helical system heliotron/torsatron plasma. Drastic changes of radial electric field between positive and negative states occur over periods as short as 60 μs, which is much shorter than the energy confinement time scale of about a few milliseconds. A nonlinear relation between the radial electric field and radial current is obtained. This is the first experimental observation of a microsecond time scale spontaneous transition based on an electric field bifurcation in toroidal helical plasmas.",

author = "A. Fujisawa and H. Iguchi and H. Sanuki and K. Itoh and S. Lee and Y. Hamada and S. Kubo and H. Idei and Crowley, {T. P.} and R. Akiyama and K. Tanaka and T. Minami and K. Ida and S. Nishimura and S. Morita and M. Kojima and S. Hidekuma and Itoh, {S. I.} and C. Takahashi and N. Inoue and H. Suzuki and S. Okamura and K. Matsuoka",

year = "1997",

month = jan,

day = "1",

doi = "10.1103/PhysRevLett.79.1054",

language = "English",

volume = "79",

pages = "1054--1057",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron

AU - Fujisawa, A.

AU - Iguchi, H.

AU - Sanuki, H.

AU - Itoh, K.

AU - Lee, S.

AU - Hamada, Y.

AU - Kubo, S.

AU - Idei, H.

AU - Crowley, T. P.

AU - Akiyama, R.

AU - Tanaka, K.

AU - Minami, T.

AU - Ida, K.

AU - Nishimura, S.

AU - Morita, S.

AU - Kojima, M.

AU - Hidekuma, S.

AU - Itoh, S. I.

AU - Takahashi, C.

AU - Inoue, N.

AU - Suzuki, H.

AU - Okamura, S.

AU - Matsuoka, K.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - During combined electron cyclotron and neutral beam heating, an abrupt drop and rise in potential by about one half of the central electron temperature (400 V) was observed in the core of the compact helical system heliotron/torsatron plasma. Drastic changes of radial electric field between positive and negative states occur over periods as short as 60 μs, which is much shorter than the energy confinement time scale of about a few milliseconds. A nonlinear relation between the radial electric field and radial current is obtained. This is the first experimental observation of a microsecond time scale spontaneous transition based on an electric field bifurcation in toroidal helical plasmas.

AB - During combined electron cyclotron and neutral beam heating, an abrupt drop and rise in potential by about one half of the central electron temperature (400 V) was observed in the core of the compact helical system heliotron/torsatron plasma. Drastic changes of radial electric field between positive and negative states occur over periods as short as 60 μs, which is much shorter than the energy confinement time scale of about a few milliseconds. A nonlinear relation between the radial electric field and radial current is obtained. This is the first experimental observation of a microsecond time scale spontaneous transition based on an electric field bifurcation in toroidal helical plasmas.

UR - http://www.scopus.com/inward/record.url?scp=0031209668&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031209668&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.79.1054

DO - 10.1103/PhysRevLett.79.1054

M3 - Article

AN - SCOPUS:0031209668

SN - 0031-9007

VL - 79

SP - 1054

EP - 1057

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

ER -

Dynamic behavior of potential in the plasma core of the CHS heliotron/torsatron

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this