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

doi:10.1088/0741-3335/54/7/074001

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 journal › Article › Scientific › peer-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: B_t0 = 3.45 T, n_e0 ∼ 3 × 10¹⁹ m⁻³, I_p = 2.8 and 1.8 MA, P_RF ≤ 3 MW at 33 MHz and −90° phasing. Central toroidal rotation in the counter −I_p direction, with ω_ϕ0 up to 10 krad s−1 (V_ϕ0 ∼ 30 km s⁻¹, central thermal Mach number M_th (0) ∼ 0.07 and Alfvén Mach number M_A (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] = n_He3/n_e ∼ 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 language	English
Article number	074001
Journal	Plasma Physics and Controlled Fusion
Volume	54
Issue number	7
DOIs	https://doi.org/10.1088/0741-3335/54/7/074001
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

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10.1088/0741-3335/54/7/074001

Cite this

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, T., & JET-EFDA contributors (2012). Ion cyclotron range of frequency mode conversion flow drive in D(³He) plasmas on JET. Plasma Physics and Controlled Fusion, 54(7), Article 074001. https://doi.org/10.1088/0741-3335/54/7/074001

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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 ωϕ0 up to 10 krad s−1 (Vϕ0 ∼ 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 {JET-EFDA contributors}",

year = "2012",

doi = "10.1088/0741-3335/54/7/074001",

language = "English",

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journal = "Plasma Physics and Controlled Fusion",

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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 - JET-EFDA contributors

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 ωϕ0 up to 10 krad s−1 (Vϕ0 ∼ 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 ωϕ0 up to 10 krad s−1 (Vϕ0 ∼ 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

SN - 0741-3335

VL - 54

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 7

M1 - 074001