H-mode research in NSTX

R. Maingi; M. G. Bell; R. E. Bell; C. E. Bush; E. D. Fredrickson; D. A. Gates; T. Gray; D. W. Johnson; R. Kaita; S. M. Kaye; S. Kubota; H. W. Kugel; C. J. Lasnier; B. P. LeBlanc; R. J. Maqueda; D. Mastrovito; J. E. Menard; D. Mueller; M. Ono; F. Paoletti; S. J. Paul; Y. K.M. Peng; A. L. Roquemore; S. A. Sabbagh; C. H. Skinner; V. A. Soukhanovskii; D. Stutman; D. W. Swain; E. J. Synakowski; T. Tan; J. B. Wilgen; S. J. Zweben

doi:10.1088/0029-5515/43/9/322

H-mode research in NSTX

R. Maingi, M. G. Bell, R. E. Bell, C. E. Bush, E. D. Fredrickson, D. A. Gates, T. Gray, D. W. Johnson, R. Kaita, S. M. Kaye, S. Kubota, H. W. Kugel, C. J. Lasnier, B. P. LeBlanc, R. J. Maqueda, D. Mastrovito, J. E. Menard, D. Mueller, M. Ono, F. PaolettiS. J. Paul, Y. K.M. Peng, A. L. Roquemore, S. A. Sabbagh, C. H. Skinner, V. A. Soukhanovskii, D. Stutman, D. W. Swain, E. J. Synakowski, T. Tan, J. B. Wilgen, S. J. Zweben

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46 Scopus citations

Abstract

H-modes are routinely obtained in the National Spherical Torus Experiment (NSTX) and have become a standard operational scenario. L-H transitions triggered by NBI heating have been obtained over a wide parameter range in I_p, B_t, and n̄_e in either lower-single-null (LSN) or double-null (DN) diverted discharges. Edge localized modes are observed in both configurations but the characteristics differ between DN and LSN, which also have different triangularities (δ). An H-mode duration of 500 ms was obtained in LSN, with a total pulse length of ∼1 s. Preliminary power threshold studies indicate that the L-H threshold is between 600 kW and 1.2 MW, depending on the target parameters. Gas injector fuelling from the centre stack (i.e. the high toroidal field side) has enabled routing H-mode access, and comparisons with low-field side (LFS) fuelled H-mode discharges show that the LFS fuelling delays the L-H transition and alters the pre-transition plasma profiles. Gas puff imaging and reflectometry show that the H-mode edge is usually more quiescent than the L-mode edge. Divertor infrared camera measurements indicate up to 70% of available power flows to the divertor targets in quiescent H-mode discharges.

Original language	English
Pages (from-to)	969-974
Number of pages	6
Journal	Nuclear Fusion
Volume	43
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/43/9/322
State	Published - Sep 2003
Externally published	Yes

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Maingi, R., Bell, M. G., Bell, R. E., Bush, C. E., Fredrickson, E. D., Gates, D. A., Gray, T., Johnson, D. W., Kaita, R., Kaye, S. M., Kubota, S., Kugel, H. W., Lasnier, C. J., LeBlanc, B. P., Maqueda, R. J., Mastrovito, D., Menard, J. E., Mueller, D., Ono, M., ... Zweben, S. J. (2003). H-mode research in NSTX. Nuclear Fusion, 43(9), 969-974. https://doi.org/10.1088/0029-5515/43/9/322

@article{d4b34f8073364dceb99f9e4bd6915ea3,

title = "H-mode research in NSTX",

abstract = "H-modes are routinely obtained in the National Spherical Torus Experiment (NSTX) and have become a standard operational scenario. L-H transitions triggered by NBI heating have been obtained over a wide parameter range in Ip, Bt, and {\=n}e in either lower-single-null (LSN) or double-null (DN) diverted discharges. Edge localized modes are observed in both configurations but the characteristics differ between DN and LSN, which also have different triangularities (δ). An H-mode duration of 500 ms was obtained in LSN, with a total pulse length of ∼1 s. Preliminary power threshold studies indicate that the L-H threshold is between 600 kW and 1.2 MW, depending on the target parameters. Gas injector fuelling from the centre stack (i.e. the high toroidal field side) has enabled routing H-mode access, and comparisons with low-field side (LFS) fuelled H-mode discharges show that the LFS fuelling delays the L-H transition and alters the pre-transition plasma profiles. Gas puff imaging and reflectometry show that the H-mode edge is usually more quiescent than the L-mode edge. Divertor infrared camera measurements indicate up to 70% of available power flows to the divertor targets in quiescent H-mode discharges.",

author = "R. Maingi and Bell, {M. G.} and Bell, {R. E.} and Bush, {C. E.} and Fredrickson, {E. D.} and Gates, {D. A.} and T. Gray and Johnson, {D. W.} and R. Kaita and Kaye, {S. M.} and S. Kubota and Kugel, {H. W.} and Lasnier, {C. J.} and LeBlanc, {B. P.} and Maqueda, {R. J.} and D. Mastrovito and Menard, {J. E.} and D. Mueller and M. Ono and F. Paoletti and Paul, {S. J.} and Peng, {Y. K.M.} and Roquemore, {A. L.} and Sabbagh, {S. A.} and Skinner, {C. H.} and Soukhanovskii, {V. A.} and D. Stutman and Swain, {D. W.} and Synakowski, {E. J.} and T. Tan and Wilgen, {J. B.} and Zweben, {S. J.}",

year = "2003",

month = sep,

doi = "10.1088/0029-5515/43/9/322",

language = "English",

volume = "43",

pages = "969--974",

journal = "Nuclear Fusion",

issn = "0029-5515",

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Maingi, R, Bell, MG, Bell, RE, Bush, CE, Fredrickson, ED, Gates, DA, Gray, T, Johnson, DW, Kaita, R, Kaye, SM, Kubota, S, Kugel, HW, Lasnier, CJ, LeBlanc, BP, Maqueda, RJ, Mastrovito, D, Menard, JE, Mueller, D, Ono, M, Paoletti, F, Paul, SJ, Peng, YKM, Roquemore, AL, Sabbagh, SA, Skinner, CH, Soukhanovskii, VA, Stutman, D, Swain, DW, Synakowski, EJ, Tan, T, Wilgen, JB & Zweben, SJ 2003, 'H-mode research in NSTX', Nuclear Fusion, vol. 43, no. 9, pp. 969-974. https://doi.org/10.1088/0029-5515/43/9/322

TY - JOUR

T1 - H-mode research in NSTX

AU - Maingi, R.

AU - Bell, M. G.

AU - Bell, R. E.

AU - Bush, C. E.

AU - Fredrickson, E. D.

AU - Gates, D. A.

AU - Gray, T.

AU - Johnson, D. W.

AU - Kaita, R.

AU - Kaye, S. M.

AU - Kubota, S.

AU - Kugel, H. W.

AU - Lasnier, C. J.

AU - LeBlanc, B. P.

AU - Maqueda, R. J.

AU - Mastrovito, D.

AU - Menard, J. E.

AU - Mueller, D.

AU - Ono, M.

AU - Paoletti, F.

AU - Paul, S. J.

AU - Peng, Y. K.M.

AU - Roquemore, A. L.

AU - Sabbagh, S. A.

AU - Skinner, C. H.

AU - Soukhanovskii, V. A.

AU - Stutman, D.

AU - Swain, D. W.

AU - Synakowski, E. J.

AU - Tan, T.

AU - Wilgen, J. B.

AU - Zweben, S. J.

PY - 2003/9

Y1 - 2003/9

N2 - H-modes are routinely obtained in the National Spherical Torus Experiment (NSTX) and have become a standard operational scenario. L-H transitions triggered by NBI heating have been obtained over a wide parameter range in Ip, Bt, and n̄e in either lower-single-null (LSN) or double-null (DN) diverted discharges. Edge localized modes are observed in both configurations but the characteristics differ between DN and LSN, which also have different triangularities (δ). An H-mode duration of 500 ms was obtained in LSN, with a total pulse length of ∼1 s. Preliminary power threshold studies indicate that the L-H threshold is between 600 kW and 1.2 MW, depending on the target parameters. Gas injector fuelling from the centre stack (i.e. the high toroidal field side) has enabled routing H-mode access, and comparisons with low-field side (LFS) fuelled H-mode discharges show that the LFS fuelling delays the L-H transition and alters the pre-transition plasma profiles. Gas puff imaging and reflectometry show that the H-mode edge is usually more quiescent than the L-mode edge. Divertor infrared camera measurements indicate up to 70% of available power flows to the divertor targets in quiescent H-mode discharges.

AB - H-modes are routinely obtained in the National Spherical Torus Experiment (NSTX) and have become a standard operational scenario. L-H transitions triggered by NBI heating have been obtained over a wide parameter range in Ip, Bt, and n̄e in either lower-single-null (LSN) or double-null (DN) diverted discharges. Edge localized modes are observed in both configurations but the characteristics differ between DN and LSN, which also have different triangularities (δ). An H-mode duration of 500 ms was obtained in LSN, with a total pulse length of ∼1 s. Preliminary power threshold studies indicate that the L-H threshold is between 600 kW and 1.2 MW, depending on the target parameters. Gas injector fuelling from the centre stack (i.e. the high toroidal field side) has enabled routing H-mode access, and comparisons with low-field side (LFS) fuelled H-mode discharges show that the LFS fuelling delays the L-H transition and alters the pre-transition plasma profiles. Gas puff imaging and reflectometry show that the H-mode edge is usually more quiescent than the L-mode edge. Divertor infrared camera measurements indicate up to 70% of available power flows to the divertor targets in quiescent H-mode discharges.

UR - http://www.scopus.com/inward/record.url?scp=0141566347&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/43/9/322

DO - 10.1088/0029-5515/43/9/322

M3 - Article

AN - SCOPUS:0141566347

SN - 0029-5515

VL - 43

SP - 969

EP - 974

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

ER -

H-mode research in NSTX

Abstract

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