Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development

C. S. Collins; W. W. Heidbrink; M. Podestà; R. B. White; G. J. Kramer; D. C. Pace; C. C. Petty; L. Stagner; M. A. Van Zeeland; Y. B. Zhu

Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development

C. S. Collins, W. W. Heidbrink, M. Podestà, R. B. White, G. J. Kramer, D. C. Pace, C. C. Petty, L. Stagner, M. A. Van Zeeland, Y. B. Zhu

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Experiments in the DIII-D tokamak show that many overlapping small-amplitude Alfvén eigenmodes (AEs) cause fast-ion transport that is consistent with the critical gradient paradigm. Measurements indicate a sudden increase in fast-ion transport in the presence of many simultaneous AEs at a threshold in neutral beam power corresponding to a threshold for orbit stochasticity [1]. The threshold varies in fast-ion phase space and is well above the AE linear stability threshold, meaning that some AEs can be tolerated before performance-degrading transport occurs. Above threshold, transport becomes stiff, resulting in virtually unchanged fast-ion density profiles despite increased beam drive. These studies are being used to develop a validated, predictive transport model that can efficiently calculate AE-induced transport and the resulting fast-ion profile over a wide parameter regime in order to design optimal fusion reactor scenarios that avoid undesirable AE-transport.

Original language	English
Title of host publication	44th EPS Conference on Plasma Physics, EPS 2017
Editors	A. Bret, M. Fajardo, E. Westerhof, A. Melzer, B. Dromey, C. Riconda
Publisher	European Physical Society (EPS)
ISBN (Print)	9781510849303
State	Published - 2017
Externally published	Yes
Event	44th European Physical Society Conference on Plasma Physics, EPS 2017 - Belfast, United Kingdom Duration: Jun 26 2017 → Jun 30 2017

Publication series

Name	44th EPS Conference on Plasma Physics, EPS 2017

Conference

Conference	44th European Physical Society Conference on Plasma Physics, EPS 2017
Country/Territory	United Kingdom
City	Belfast
Period	06/26/17 → 06/30/17

Funding

*Work supported by U.S. Department of Energy under DE-FC02-04ER54698, DE-FG03-

Cite this

Collins, C. S., Heidbrink, W. W., Podestà, M., White, R. B., Kramer, G. J., Pace, D. C., Petty, C. C., Stagner, L., Van Zeeland, M. A., & Zhu, Y. B. (2017). Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development. In A. Bret, M. Fajardo, E. Westerhof, A. Melzer, B. Dromey, & C. Riconda (Eds.), 44th EPS Conference on Plasma Physics, EPS 2017 Article P1.101 (44th EPS Conference on Plasma Physics, EPS 2017). European Physical Society (EPS).

Collins, C. S. ; Heidbrink, W. W. ; Podestà, M. et al. / Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development. 44th EPS Conference on Plasma Physics, EPS 2017. editor / A. Bret ; M. Fajardo ; E. Westerhof ; A. Melzer ; B. Dromey ; C. Riconda. European Physical Society (EPS), 2017. (44th EPS Conference on Plasma Physics, EPS 2017).

@inproceedings{5112e23f314d401ba436bc89bff52180,

title = "Measurements of critical gradient behavior of fast-ion transport from Alfv{\'e}n eigenmodes for predictive model development",

abstract = "Experiments in the DIII-D tokamak show that many overlapping small-amplitude Alfv{\'e}n eigenmodes (AEs) cause fast-ion transport that is consistent with the critical gradient paradigm. Measurements indicate a sudden increase in fast-ion transport in the presence of many simultaneous AEs at a threshold in neutral beam power corresponding to a threshold for orbit stochasticity [1]. The threshold varies in fast-ion phase space and is well above the AE linear stability threshold, meaning that some AEs can be tolerated before performance-degrading transport occurs. Above threshold, transport becomes stiff, resulting in virtually unchanged fast-ion density profiles despite increased beam drive. These studies are being used to develop a validated, predictive transport model that can efficiently calculate AE-induced transport and the resulting fast-ion profile over a wide parameter regime in order to design optimal fusion reactor scenarios that avoid undesirable AE-transport.",

author = "Collins, {C. S.} and Heidbrink, {W. W.} and M. Podest{\`a} and White, {R. B.} and Kramer, {G. J.} and Pace, {D. C.} and Petty, {C. C.} and L. Stagner and {Van Zeeland}, {M. A.} and Zhu, {Y. B.}",

note = "Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.; 44th European Physical Society Conference on Plasma Physics, EPS 2017 ; Conference date: 26-06-2017 Through 30-06-2017",

year = "2017",

language = "English",

isbn = "9781510849303",

series = "44th EPS Conference on Plasma Physics, EPS 2017",

publisher = "European Physical Society (EPS)",

editor = "A. Bret and M. Fajardo and E. Westerhof and A. Melzer and B. Dromey and C. Riconda",

booktitle = "44th EPS Conference on Plasma Physics, EPS 2017",

}

Collins, CS, Heidbrink, WW, Podestà, M, White, RB, Kramer, GJ, Pace, DC, Petty, CC, Stagner, L, Van Zeeland, MA & Zhu, YB 2017, Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development. in A Bret, M Fajardo, E Westerhof, A Melzer, B Dromey & C Riconda (eds), 44th EPS Conference on Plasma Physics, EPS 2017., P1.101, 44th EPS Conference on Plasma Physics, EPS 2017, European Physical Society (EPS), 44th European Physical Society Conference on Plasma Physics, EPS 2017, Belfast, United Kingdom, 06/26/17.

Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development. / Collins, C. S.; Heidbrink, W. W.; Podestà, M. et al.
44th EPS Conference on Plasma Physics, EPS 2017. ed. / A. Bret; M. Fajardo; E. Westerhof; A. Melzer; B. Dromey; C. Riconda. European Physical Society (EPS), 2017. P1.101 (44th EPS Conference on Plasma Physics, EPS 2017).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Heidbrink, W. W.

AU - Podestà, M.

AU - White, R. B.

AU - Kramer, G. J.

AU - Pace, D. C.

AU - Petty, C. C.

AU - Stagner, L.

AU - Van Zeeland, M. A.

AU - Zhu, Y. B.

PY - 2017

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AB - Experiments in the DIII-D tokamak show that many overlapping small-amplitude Alfvén eigenmodes (AEs) cause fast-ion transport that is consistent with the critical gradient paradigm. Measurements indicate a sudden increase in fast-ion transport in the presence of many simultaneous AEs at a threshold in neutral beam power corresponding to a threshold for orbit stochasticity [1]. The threshold varies in fast-ion phase space and is well above the AE linear stability threshold, meaning that some AEs can be tolerated before performance-degrading transport occurs. Above threshold, transport becomes stiff, resulting in virtually unchanged fast-ion density profiles despite increased beam drive. These studies are being used to develop a validated, predictive transport model that can efficiently calculate AE-induced transport and the resulting fast-ion profile over a wide parameter regime in order to design optimal fusion reactor scenarios that avoid undesirable AE-transport.

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A2 - Fajardo, M.

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A2 - Melzer, A.

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Collins CS, Heidbrink WW, Podestà M, White RB, Kramer GJ, Pace DC et al. Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development. In Bret A, Fajardo M, Westerhof E, Melzer A, Dromey B, Riconda C, editors, 44th EPS Conference on Plasma Physics, EPS 2017. European Physical Society (EPS). 2017. P1.101. (44th EPS Conference on Plasma Physics, EPS 2017).

Measurements of critical gradient behavior of fast-ion transport from Alfvén eigenmodes for predictive model development

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