Increased understanding of neoclassical internal transport barriers in CHS

T. Minami; A. Fujisawa; H. Iguchi; Y. Liang; K. Ida; S. Nishimura; M. Yokoyama; S. Murakami; Y. Yoshimura; M. Isobe; C. Suzuki; I. Nomura; K. Toi; M. Yoshinuma; A. Shimizu; C. Takahashi; K. Matsuoka; S. Okamura

doi:10.1088/0029-5515/44/2/017

Increased understanding of neoclassical internal transport barriers in CHS

T. Minami, A. Fujisawa, H. Iguchi, Y. Liang, K. Ida, S. Nishimura, M. Yokoyama, S. Murakami, Y. Yoshimura, M. Isobe, C. Suzuki, I. Nomura, K. Toi, M. Yoshinuma, A. Shimizu, C. Takahashi, K. Matsuoka, S. Okamura

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

35 Citations (Scopus)

Abstract

We report recent progress in the study of neoclassical internal transport barriers (N-ITBs) in the compact helical system (CHS) experiment. N-ITBs have been observed in electron cyclotron (EC) heated NBI plasmas. The improved confinement region for electrons is expanded compared with that of previous N-ITB plasmas heated by only EC heating. Moreover, the ion temperature is found to be increased simultaneously by two to three times (T_i(0) ∼ 400-500 eV), with a steep gradient region at ρ ∼ 0.6. From measurement of the averaged peak energy intensity using a soft x-ray CCD camera, it is confirmed that the impurity confinement is also improved with N-ITBs. The radial electric field is observed to bifurcate into ion and electron root (E_r ∼ 15 kV m^-1), and a rather large electric field shear (dE_r/dr ∼ -300 kV m^-2) is produced in the layer between ion and electron root.

Original language	English
Pages (from-to)	342-349
Number of pages	8
Journal	Nuclear Fusion
Volume	44
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/44/2/017
Publication status	Published - Feb 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

Access to Document

10.1088/0029-5515/44/2/017

Cite this

Minami, T., Fujisawa, A., Iguchi, H., Liang, Y., Ida, K., Nishimura, S., Yokoyama, M., Murakami, S., Yoshimura, Y., Isobe, M., Suzuki, C., Nomura, I., Toi, K., Yoshinuma, M., Shimizu, A., Takahashi, C., Matsuoka, K., & Okamura, S. (2004). Increased understanding of neoclassical internal transport barriers in CHS. Nuclear Fusion, 44(2), 342-349. https://doi.org/10.1088/0029-5515/44/2/017

Minami, T, Fujisawa, A, Iguchi, H, Liang, Y, Ida, K, Nishimura, S, Yokoyama, M, Murakami, S, Yoshimura, Y, Isobe, M, Suzuki, C, Nomura, I, Toi, K, Yoshinuma, M, Shimizu, A, Takahashi, C, Matsuoka, K & Okamura, S 2004, 'Increased understanding of neoclassical internal transport barriers in CHS', Nuclear Fusion, vol. 44, no. 2, pp. 342-349. https://doi.org/10.1088/0029-5515/44/2/017

@article{2930631c4c3f46f48c2bf000748564af,

title = "Increased understanding of neoclassical internal transport barriers in CHS",

abstract = "We report recent progress in the study of neoclassical internal transport barriers (N-ITBs) in the compact helical system (CHS) experiment. N-ITBs have been observed in electron cyclotron (EC) heated NBI plasmas. The improved confinement region for electrons is expanded compared with that of previous N-ITB plasmas heated by only EC heating. Moreover, the ion temperature is found to be increased simultaneously by two to three times (Ti(0) ∼ 400-500 eV), with a steep gradient region at ρ ∼ 0.6. From measurement of the averaged peak energy intensity using a soft x-ray CCD camera, it is confirmed that the impurity confinement is also improved with N-ITBs. The radial electric field is observed to bifurcate into ion and electron root (Er ∼ 15 kV m-1), and a rather large electric field shear (dEr/dr ∼ -300 kV m-2) is produced in the layer between ion and electron root.",

author = "T. Minami and A. Fujisawa and H. Iguchi and Y. Liang and K. Ida and S. Nishimura and M. Yokoyama and S. Murakami and Y. Yoshimura and M. Isobe and C. Suzuki and I. Nomura and K. Toi and M. Yoshinuma and A. Shimizu and C. Takahashi and K. Matsuoka and S. Okamura",

year = "2004",

month = feb,

doi = "10.1088/0029-5515/44/2/017",

language = "English",

volume = "44",

pages = "342--349",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "2",

}

TY - JOUR

T1 - Increased understanding of neoclassical internal transport barriers in CHS

AU - Minami, T.

AU - Fujisawa, A.

AU - Iguchi, H.

AU - Liang, Y.

AU - Ida, K.

AU - Nishimura, S.

AU - Yokoyama, M.

AU - Murakami, S.

AU - Yoshimura, Y.

AU - Isobe, M.

AU - Suzuki, C.

AU - Nomura, I.

AU - Toi, K.

AU - Yoshinuma, M.

AU - Shimizu, A.

AU - Takahashi, C.

AU - Matsuoka, K.

AU - Okamura, S.

PY - 2004/2

Y1 - 2004/2

N2 - We report recent progress in the study of neoclassical internal transport barriers (N-ITBs) in the compact helical system (CHS) experiment. N-ITBs have been observed in electron cyclotron (EC) heated NBI plasmas. The improved confinement region for electrons is expanded compared with that of previous N-ITB plasmas heated by only EC heating. Moreover, the ion temperature is found to be increased simultaneously by two to three times (Ti(0) ∼ 400-500 eV), with a steep gradient region at ρ ∼ 0.6. From measurement of the averaged peak energy intensity using a soft x-ray CCD camera, it is confirmed that the impurity confinement is also improved with N-ITBs. The radial electric field is observed to bifurcate into ion and electron root (Er ∼ 15 kV m-1), and a rather large electric field shear (dEr/dr ∼ -300 kV m-2) is produced in the layer between ion and electron root.

AB - We report recent progress in the study of neoclassical internal transport barriers (N-ITBs) in the compact helical system (CHS) experiment. N-ITBs have been observed in electron cyclotron (EC) heated NBI plasmas. The improved confinement region for electrons is expanded compared with that of previous N-ITB plasmas heated by only EC heating. Moreover, the ion temperature is found to be increased simultaneously by two to three times (Ti(0) ∼ 400-500 eV), with a steep gradient region at ρ ∼ 0.6. From measurement of the averaged peak energy intensity using a soft x-ray CCD camera, it is confirmed that the impurity confinement is also improved with N-ITBs. The radial electric field is observed to bifurcate into ion and electron root (Er ∼ 15 kV m-1), and a rather large electric field shear (dEr/dr ∼ -300 kV m-2) is produced in the layer between ion and electron root.

UR - http://www.scopus.com/inward/record.url?scp=12144291089&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=12144291089&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/44/2/017

DO - 10.1088/0029-5515/44/2/017

M3 - Article

AN - SCOPUS:12144291089

SN - 0029-5515

VL - 44

SP - 342

EP - 349

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 2

ER -

Increased understanding of neoclassical internal transport barriers in CHS

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this