Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET

Y. Lin, P. Mantica, T. Hellsten, V. Kiptily, E. Lerche, M.F.F. Nave, J.E. Rice, D. Van Eester, P.C. De Vries, R. Felton, C. Giroud, Tuomas Tala, JET EFDA contributors

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Ion cyclotron range of frequency (ICRF) mode conversion has been shown to drive toroidal flow in JET D(3He) L-mode plasmas: Bt0 = 3.45 T, ne0 ~ 3 × 1019 m−3, Ip = 2.8 and 1.8 MA, PRF ≤ 3 MW at 33 MHz and −90° phasing. Central toroidal rotation in the counter-Ip direction, with ωphiv0 up to 10 krad s−1 (Vphiv0 ~ 30 km s−1, central thermal Mach number Mth (0) ~ 0.07 and Alfvén Mach number MA (0) ~ 0.003) has been observed. The flow drive effect is sensitive to the 3He concentration and the largest rotation is observed in the range X[3He] = nHe3/ne ~ 10–17%. The rotation profile is peaked near the magnetic axis, and the central rotation scales with the input RF power. The effective torque density profile from the RF power has been calculated and the total torque is estimated to be as high as 50% of the same power from neutral beam injection, and a factor of 5 larger than the direct momentum injection from the RF waves. RF physics modeling using the TORIC code shows that the interaction between the mode converted ion cyclotron wave and the 3He ions, and associated asymmetry in space and momentum, may be key for flow drive.
Original languageEnglish
Article number074001
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number7
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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Cyclotrons
cyclotrons
Plasmas
Ions
Mach number
torque
Momentum
ions
Torque
momentum
beam injection
neutral beams
profiles
counters
Physics
asymmetry
injection
physics
interactions

Cite this

Lin, Y., Mantica, P., Hellsten, T., Kiptily, V., Lerche, E., Nave, M. F. F., ... contributors, JET. EFDA. (2012). Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET. Plasma Physics and Controlled Fusion, 54(7), [074001]. https://doi.org/10.1088/0741-3335/54/7/074001
Lin, Y. ; Mantica, P. ; Hellsten, T. ; Kiptily, V. ; Lerche, E. ; Nave, M.F.F. ; Rice, J.E. ; Van Eester, D. ; De Vries, P.C. ; Felton, R. ; Giroud, C. ; Tala, Tuomas ; contributors, JET EFDA. / Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET. In: Plasma Physics and Controlled Fusion. 2012 ; Vol. 54, No. 7.
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title = "Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET",
abstract = "Ion cyclotron range of frequency (ICRF) mode conversion has been shown to drive toroidal flow in JET D(3He) L-mode plasmas: Bt0 = 3.45 T, ne0 ~ 3 × 1019 m−3, Ip = 2.8 and 1.8 MA, PRF ≤ 3 MW at 33 MHz and −90° phasing. Central toroidal rotation in the counter-Ip direction, with ωphiv0 up to 10 krad s−1 (Vphiv0 ~ 30 km s−1, central thermal Mach number Mth (0) ~ 0.07 and Alfv{\'e}n Mach number MA (0) ~ 0.003) has been observed. The flow drive effect is sensitive to the 3He concentration and the largest rotation is observed in the range X[3He] = nHe3/ne ~ 10–17{\%}. The rotation profile is peaked near the magnetic axis, and the central rotation scales with the input RF power. The effective torque density profile from the RF power has been calculated and the total torque is estimated to be as high as 50{\%} of the same power from neutral beam injection, and a factor of 5 larger than the direct momentum injection from the RF waves. RF physics modeling using the TORIC code shows that the interaction between the mode converted ion cyclotron wave and the 3He ions, and associated asymmetry in space and momentum, may be key for flow drive.",
author = "Y. Lin and P. Mantica and T. Hellsten and V. Kiptily and E. Lerche and M.F.F. Nave and J.E. Rice and {Van Eester}, D. and {De Vries}, P.C. and R. Felton and C. Giroud and Tuomas Tala and contributors, {JET EFDA}",
year = "2012",
doi = "10.1088/0741-3335/54/7/074001",
language = "English",
volume = "54",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
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Lin, Y, Mantica, P, Hellsten, T, Kiptily, V, Lerche, E, Nave, MFF, Rice, JE, Van Eester, D, De Vries, PC, Felton, R, Giroud, C, Tala, T & contributors, JETEFDA 2012, 'Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET', Plasma Physics and Controlled Fusion, vol. 54, no. 7, 074001. https://doi.org/10.1088/0741-3335/54/7/074001

Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET. / Lin, Y.; Mantica, P.; Hellsten, T.; Kiptily, V.; Lerche, E.; Nave, M.F.F.; Rice, J.E.; Van Eester, D.; De Vries, P.C.; Felton, R.; Giroud, C.; Tala, Tuomas; contributors, JET EFDA.

In: Plasma Physics and Controlled Fusion, Vol. 54, No. 7, 074001, 2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Ion cyclotron range of frequency mode conversion flow drive in D(3He) plasmas on JET

AU - Lin, Y.

AU - Mantica, P.

AU - Hellsten, T.

AU - Kiptily, V.

AU - Lerche, E.

AU - Nave, M.F.F.

AU - Rice, J.E.

AU - Van Eester, D.

AU - De Vries, P.C.

AU - Felton, R.

AU - Giroud, C.

AU - Tala, Tuomas

AU - contributors, JET EFDA

PY - 2012

Y1 - 2012

N2 - Ion cyclotron range of frequency (ICRF) mode conversion has been shown to drive toroidal flow in JET D(3He) L-mode plasmas: Bt0 = 3.45 T, ne0 ~ 3 × 1019 m−3, Ip = 2.8 and 1.8 MA, PRF ≤ 3 MW at 33 MHz and −90° phasing. Central toroidal rotation in the counter-Ip direction, with ωphiv0 up to 10 krad s−1 (Vphiv0 ~ 30 km s−1, central thermal Mach number Mth (0) ~ 0.07 and Alfvén Mach number MA (0) ~ 0.003) has been observed. The flow drive effect is sensitive to the 3He concentration and the largest rotation is observed in the range X[3He] = nHe3/ne ~ 10–17%. The rotation profile is peaked near the magnetic axis, and the central rotation scales with the input RF power. The effective torque density profile from the RF power has been calculated and the total torque is estimated to be as high as 50% of the same power from neutral beam injection, and a factor of 5 larger than the direct momentum injection from the RF waves. RF physics modeling using the TORIC code shows that the interaction between the mode converted ion cyclotron wave and the 3He ions, and associated asymmetry in space and momentum, may be key for flow drive.

AB - Ion cyclotron range of frequency (ICRF) mode conversion has been shown to drive toroidal flow in JET D(3He) L-mode plasmas: Bt0 = 3.45 T, ne0 ~ 3 × 1019 m−3, Ip = 2.8 and 1.8 MA, PRF ≤ 3 MW at 33 MHz and −90° phasing. Central toroidal rotation in the counter-Ip direction, with ωphiv0 up to 10 krad s−1 (Vphiv0 ~ 30 km s−1, central thermal Mach number Mth (0) ~ 0.07 and Alfvén Mach number MA (0) ~ 0.003) has been observed. The flow drive effect is sensitive to the 3He concentration and the largest rotation is observed in the range X[3He] = nHe3/ne ~ 10–17%. The rotation profile is peaked near the magnetic axis, and the central rotation scales with the input RF power. The effective torque density profile from the RF power has been calculated and the total torque is estimated to be as high as 50% of the same power from neutral beam injection, and a factor of 5 larger than the direct momentum injection from the RF waves. RF physics modeling using the TORIC code shows that the interaction between the mode converted ion cyclotron wave and the 3He ions, and associated asymmetry in space and momentum, may be key for flow drive.

U2 - 10.1088/0741-3335/54/7/074001

DO - 10.1088/0741-3335/54/7/074001

M3 - Article

VL - 54

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 7

M1 - 074001

ER -