Energetic ion transport by microturbulence is insignificant in tokamaks

D. C. Pace; M. E. Austin; E. M. Bass; R. V. Budny; W. W. Heidbrink; J. C. Hillesheim; C. T. Holcomb; M. Gorelenkova; B. A. Grierson; D. C. McCune; G. R. McKee; C. M. Muscatello; J. M. Park; C. C. Petty; T. L. Rhodes; G. M. Staebler; T. Suzuki; M. A. Van Zeeland; R. E. Waltz; G. Wang; A. E. White; Z. Yan; X. Yuan; Y. B. Zhu

doi:10.1063/1.4803930

Energetic ion transport by microturbulence is insignificant in tokamaks

D. C. Pace, M. E. Austin, E. M. Bass, R. V. Budny, W. W. Heidbrink, J. C. Hillesheim, C. T. Holcomb, M. Gorelenkova, B. A. Grierson, D. C. McCune, G. R. McKee, C. M. Muscatello, J. M. Park, C. C. Petty, T. L. Rhodes, G. M. Staebler, T. Suzuki, M. A. Van Zeeland, R. E. Waltz, G. WangA. E. White, Z. Yan, X. Yuan, Y. B. Zhu

Plasma Theory and Modeling

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

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Abstract

Energetic ion transport due to microturbulence is investigated in magnetohydrodynamic-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. A range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of E b / T e, where E_b is the energetic ion energy and T_e the electron temperature. In all cases, it is found that any transport enhancement due to microturbulence is too small to observe experimentally. These transport effects are modeled using numerical and analytic expectations that calculate the energetic ion diffusivity due to microturbulence. It is determined that energetic ion transport due to coherent fluctuations (e.g., Alfvén eigenmodes) is a considerably larger effect and should therefore be considered more important for ITER.

Original language	English
Article number	056108
Journal	Physics of Plasmas
Volume	20
Issue number	5
DOIs	https://doi.org/10.1063/1.4803930
State	Published - May 2013

Funding

This work was supported in part by the US Department of Energy under DE-FC02-04ER54698, DE-FC02-99ER54512, DE-FG03-97ER54415, DE-FG02-07ER54917, DE-AC02-09CH11466, SC-G903402, DE-FG02-08ER54984, DE-AC52-07NA27344, DE-FG02-89ER53296, DE-FG02-08ER54999, and DE-AC05-00OR22725. The authors are grateful to M. Albergante, A. Fasoli, S. Jardin, and ITPA Energetic Particles Group for thoughtful discussions on this topic, R. J. Groebner for assisting with the processing of CER data, and B. Geiger and M. García-Muñoz for sharing their results from ASDEX Upgrade. The experimental work was made possible by the extraordinary personnel of the DIII-D National Fusion Facility.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725, DE-FG03-97ER54415, DE-FG02-08ER54999, DE-FG02-08ER54984, DE-AC02-09CH11466, DE-FC02-04ER54698, DE-AC52-07NA27344, DE-FC02-99ER54512, DE-FG02-07ER54917, DE-FG02-89ER53296, SC-G903402

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Pace, D. C., Austin, M. E., Bass, E. M., Budny, R. V., Heidbrink, W. W., Hillesheim, J. C., Holcomb, C. T., Gorelenkova, M., Grierson, B. A., McCune, D. C., McKee, G. R., Muscatello, C. M., Park, J. M., Petty, C. C., Rhodes, T. L., Staebler, G. M., Suzuki, T., Van Zeeland, M. A., Waltz, R. E., ... Zhu, Y. B. (2013). Energetic ion transport by microturbulence is insignificant in tokamaks. Physics of Plasmas, 20(5), Article 056108. https://doi.org/10.1063/1.4803930

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title = "Energetic ion transport by microturbulence is insignificant in tokamaks",

abstract = "Energetic ion transport due to microturbulence is investigated in magnetohydrodynamic-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. A range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of E b / T e, where Eb is the energetic ion energy and Te the electron temperature. In all cases, it is found that any transport enhancement due to microturbulence is too small to observe experimentally. These transport effects are modeled using numerical and analytic expectations that calculate the energetic ion diffusivity due to microturbulence. It is determined that energetic ion transport due to coherent fluctuations (e.g., Alfv{\'e}n eigenmodes) is a considerably larger effect and should therefore be considered more important for ITER.",

author = "Pace, {D. C.} and Austin, {M. E.} and Bass, {E. M.} and Budny, {R. V.} and Heidbrink, {W. W.} and Hillesheim, {J. C.} and Holcomb, {C. T.} and M. Gorelenkova and Grierson, {B. A.} and McCune, {D. C.} and McKee, {G. R.} and Muscatello, {C. M.} and Park, {J. M.} and Petty, {C. C.} and Rhodes, {T. L.} and Staebler, {G. M.} and T. Suzuki and {Van Zeeland}, {M. A.} and Waltz, {R. E.} and G. Wang and White, {A. E.} and Z. Yan and X. Yuan and Zhu, {Y. B.}",

year = "2013",

month = may,

doi = "10.1063/1.4803930",

language = "English",

volume = "20",

journal = "Physics of Plasmas",

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Pace, DC, Austin, ME, Bass, EM, Budny, RV, Heidbrink, WW, Hillesheim, JC, Holcomb, CT, Gorelenkova, M, Grierson, BA, McCune, DC, McKee, GR, Muscatello, CM, Park, JM, Petty, CC, Rhodes, TL, Staebler, GM, Suzuki, T, Van Zeeland, MA, Waltz, RE, Wang, G, White, AE, Yan, Z, Yuan, X & Zhu, YB 2013, 'Energetic ion transport by microturbulence is insignificant in tokamaks', Physics of Plasmas, vol. 20, no. 5, 056108. https://doi.org/10.1063/1.4803930

TY - JOUR

T1 - Energetic ion transport by microturbulence is insignificant in tokamaks

AU - Pace, D. C.

AU - Austin, M. E.

AU - Bass, E. M.

AU - Budny, R. V.

AU - Heidbrink, W. W.

AU - Hillesheim, J. C.

AU - Holcomb, C. T.

AU - Gorelenkova, M.

AU - Grierson, B. A.

AU - McCune, D. C.

AU - McKee, G. R.

AU - Muscatello, C. M.

AU - Park, J. M.

AU - Petty, C. C.

AU - Rhodes, T. L.

AU - Staebler, G. M.

AU - Suzuki, T.

AU - Van Zeeland, M. A.

AU - Waltz, R. E.

AU - Wang, G.

AU - White, A. E.

AU - Yan, Z.

AU - Yuan, X.

AU - Zhu, Y. B.

PY - 2013/5

Y1 - 2013/5

N2 - Energetic ion transport due to microturbulence is investigated in magnetohydrodynamic-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. A range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of E b / T e, where Eb is the energetic ion energy and Te the electron temperature. In all cases, it is found that any transport enhancement due to microturbulence is too small to observe experimentally. These transport effects are modeled using numerical and analytic expectations that calculate the energetic ion diffusivity due to microturbulence. It is determined that energetic ion transport due to coherent fluctuations (e.g., Alfvén eigenmodes) is a considerably larger effect and should therefore be considered more important for ITER.

AB - Energetic ion transport due to microturbulence is investigated in magnetohydrodynamic-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. A range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of E b / T e, where Eb is the energetic ion energy and Te the electron temperature. In all cases, it is found that any transport enhancement due to microturbulence is too small to observe experimentally. These transport effects are modeled using numerical and analytic expectations that calculate the energetic ion diffusivity due to microturbulence. It is determined that energetic ion transport due to coherent fluctuations (e.g., Alfvén eigenmodes) is a considerably larger effect and should therefore be considered more important for ITER.

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DO - 10.1063/1.4803930

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SN - 1070-664X

VL - 20

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056108

ER -

Energetic ion transport by microturbulence is insignificant in tokamaks

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