The phase-space dependence of fast-ion interaction with tearing modes
Abstract
Modulation of various neutral beam sources probes the interaction of fast ions with tearing modes (TM) in the DIII-D tokamak. As measured by electron cyclotron emission, the (m,n) = (2,1) tearing modes have an island width of ~8 cm and change phase 180 at the q = 2 surface. (Here, m is the poloidal mode number and n is the toroidal mode number.) Deuterium neutral beam injection by six sources with differing injection geometries produces the fast ions. To study the interaction in different parts of phase space, on successive discharges, one of the six sources is modulated at 20 Hz to populate different fast-ion orbits. The modulation only changes the island width by a few millimeters, implying that any fast-ion effect on mode stability is below detection limits. When compared to the expected signals in the absence of TM-induced transport, both the average and modulated neutron signals deviate, implying that fast-ion transport occurs in much of phase space. Fast-ion D-α (FIDA) measurements detect reductions in signal at wavelengths that are sensitive to counter-passing ions. Neutral particle analyzer data imply poor confinement of trapped fast ions. Lastly, calculations of the expected fast-ion transport that use measured TM properties successfully reproducemore »
- Authors:
-
- Univ. of California, Irvine, CA (United States). Department of Physics and Astronomy
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States). Inertial Fusion Technology
- Univ. of California, Irvine, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States). NSTX
- General Atomics, San Diego, CA, United States of America
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1429876
- Report Number(s):
- DOE-GA-54698
Journal ID: ISSN 0029-5515; TRN: US1802485
- Grant/Contract Number:
- FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 8; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tearing modes; fast ions; FIDA
Citation Formats
Heidbrink, William W., Bardoczi, Laszlo, Collins, Cami S., Kramer, Gerrit J., La Haye, Robert J., Lin, D. J., Muscatello, Christopher M., Podesta, Mario, Stagner, Luke, Van Zeeland, Michael A., and Zhu, Yubao. The phase-space dependence of fast-ion interaction with tearing modes. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aab7b6.
Heidbrink, William W., Bardoczi, Laszlo, Collins, Cami S., Kramer, Gerrit J., La Haye, Robert J., Lin, D. J., Muscatello, Christopher M., Podesta, Mario, Stagner, Luke, Van Zeeland, Michael A., & Zhu, Yubao. The phase-space dependence of fast-ion interaction with tearing modes. United States. https://doi.org/10.1088/1741-4326/aab7b6
Heidbrink, William W., Bardoczi, Laszlo, Collins, Cami S., Kramer, Gerrit J., La Haye, Robert J., Lin, D. J., Muscatello, Christopher M., Podesta, Mario, Stagner, Luke, Van Zeeland, Michael A., and Zhu, Yubao. Tue .
"The phase-space dependence of fast-ion interaction with tearing modes". United States. https://doi.org/10.1088/1741-4326/aab7b6. https://www.osti.gov/servlets/purl/1429876.
@article{osti_1429876,
title = {The phase-space dependence of fast-ion interaction with tearing modes},
author = {Heidbrink, William W. and Bardoczi, Laszlo and Collins, Cami S. and Kramer, Gerrit J. and La Haye, Robert J. and Lin, D. J. and Muscatello, Christopher M. and Podesta, Mario and Stagner, Luke and Van Zeeland, Michael A. and Zhu, Yubao},
abstractNote = {Modulation of various neutral beam sources probes the interaction of fast ions with tearing modes (TM) in the DIII-D tokamak. As measured by electron cyclotron emission, the (m,n) = (2,1) tearing modes have an island width of ~8 cm and change phase 180 at the q = 2 surface. (Here, m is the poloidal mode number and n is the toroidal mode number.) Deuterium neutral beam injection by six sources with differing injection geometries produces the fast ions. To study the interaction in different parts of phase space, on successive discharges, one of the six sources is modulated at 20 Hz to populate different fast-ion orbits. The modulation only changes the island width by a few millimeters, implying that any fast-ion effect on mode stability is below detection limits. When compared to the expected signals in the absence of TM-induced transport, both the average and modulated neutron signals deviate, implying that fast-ion transport occurs in much of phase space. Fast-ion D-α (FIDA) measurements detect reductions in signal at wavelengths that are sensitive to counter-passing ions. Neutral particle analyzer data imply poor confinement of trapped fast ions. Lastly, calculations of the expected fast-ion transport that use measured TM properties successfully reproduce the data.},
doi = {10.1088/1741-4326/aab7b6},
journal = {Nuclear Fusion},
number = 8,
volume = 58,
place = {United States},
year = {Tue Jul 03 00:00:00 EDT 2018},
month = {Tue Jul 03 00:00:00 EDT 2018}
}
Web of Science
Works referenced in this record:
Hybrid simulation of energetic particle effects on tearing modes in tokamak plasmas
journal, July 2012
- Cai, Huishan; Fu, Guoyong
- Physics of Plasmas, Vol. 19, Issue 7
Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985
- Lao, L. L.; St. John, H.; Stambaugh, R. D.
- Nuclear Fusion, Vol. 25, Issue 11
NTM induced fast ion losses in ASDEX Upgrade
journal, June 2007
- García-Muñoz, M.; Martin, P.; Fahrbach, H. -U
- Nuclear Fusion, Vol. 47, Issue 7
A reduced fast ion transport model for the tokamak transport code TRANSP
journal, April 2014
- Podestà, M.; Gorelenkova, M.; White, R. B.
- Plasma Physics and Controlled Fusion, Vol. 56, Issue 5
Suppression of the tearing mode by energetic ions
journal, November 1989
- Hegna, Chris C.; Bhattacharjee, A.
- Physical Review Letters, Vol. 63, Issue 19
Threshold for metastable tearing modes in DIII-D
journal, July 1998
- Haye, R. J. La; Sauter, O.
- Nuclear Fusion, Vol. 38, Issue 7
Beta limits in long-pulse tokamak discharges
journal, May 1997
- Sauter, O.; La Haye, R. J.; Chang, Z.
- Physics of Plasmas, Vol. 4, Issue 5
Effects of MHD instabilities on neutral beam current drive
journal, April 2015
- Podestà, M.; Gorelenkova, M.; Darrow, D. S.
- Nuclear Fusion, Vol. 55, Issue 5
Observation of spontaneous neoclassical tearing modes
journal, February 2002
- Fredrickson, E. D.
- Physics of Plasmas, Vol. 9, Issue 2
Fast automated analysis of high-resolution reflectometer density profiles on DIII-D
journal, August 2006
- Zeng, L.; Wang, G.; Doyle, E. J.
- Nuclear Fusion, Vol. 46, Issue 9
An upgrade of the magnetic diagnostic system of the DIII-D tokamak for non-axisymmetric measurements
journal, August 2014
- King, J. D.; Strait, E. J.; Boivin, R. L.
- Review of Scientific Instruments, Vol. 85, Issue 8
Extended fast-ion D-alpha diagnostic on DIII-D
journal, October 2010
- Muscatello, C. M.; Heidbrink, W. W.; Taussig, D.
- Review of Scientific Instruments, Vol. 81, Issue 10
Fast ion confinement and stability in a neutral beam injected reversed field pinch
journal, May 2013
- Anderson, J. K.; Almagri, A. F.; Den Hartog, D. J.
- Physics of Plasmas, Vol. 20, Issue 5
High spatial and temporal resolution visible spectroscopy of the plasma edge in DIII‐D
journal, October 1990
- Gohil, P.; Burrell, K. H.; Groebner, R. J.
- Review of Scientific Instruments, Vol. 61, Issue 10
Off-axis neutral beam current drive for advanced scenario development in DIII-D
journal, May 2009
- Murakami, M.; Park, J. M.; Petty, C. C.
- Nuclear Fusion, Vol. 49, Issue 6
Computation of Alfvèn eigenmode stability and saturation through a reduced fast ion transport model in the TRANSP tokamak transport code
journal, July 2017
- Podestà, M.; Gorelenkova, M.; Gorelenkov, N. N.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 9
Interaction of fast particles with neoclassical tearing modes
journal, March 2000
- Sesnic, S.; Günter, S.; Gude, A.
- Physics of Plasmas, Vol. 7, Issue 3
Observation of Critical-Gradient Behavior in Alfvén-Eigenmode-Induced Fast-Ion Transport
journal, February 2016
- Collins, C. S.; Heidbrink, W. W.; Austin, M. E.
- Physical Review Letters, Vol. 116, Issue 9
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
journal, June 2004
- Pankin, Alexei; McCune, Douglas; Andre, Robert
- Computer Physics Communications, Vol. 159, Issue 3
Confinement degradation by Alfvén-eigenmode induced fast-ion transport in steady-state scenario discharges
journal, August 2014
- Heidbrink, W. W.; Ferron, J. R.; Holcomb, C. T.
- Plasma Physics and Controlled Fusion, Vol. 56, Issue 9
Action-angle formulation of generalized, orbit-based, fast-ion diagnostic weight functions
journal, September 2017
- Stagner, L.; Heidbrink, W. W.
- Physics of Plasmas, Vol. 24, Issue 9
Electron cyclotron emission radiometer upgrade on the DIII-D tokamak
journal, March 2003
- Austin, M. E.; Lohr, J.
- Review of Scientific Instruments, Vol. 74, Issue 3
Development, physics basis and performance projections for hybrid scenario operation in ITER on DIII-D
journal, May 2005
- Wade, M. R.; Luce, T. C.; Jayakumar, R. J.
- Nuclear Fusion, Vol. 45, Issue 6
Commissioning of electron cyclotron emission imaging instrument on the DIII-D tokamak and first data
journal, October 2010
- Tobias, B.; Domier, C. W.; Liang, T.
- Review of Scientific Instruments, Vol. 81, Issue 10
Measurements of fast-ion acceleration at cyclotron harmonics using Balmer-alpha spectroscopy
journal, August 2007
- Heidbrink, W. W.; Luo, Y.; Burrell, K. H.
- Plasma Physics and Controlled Fusion, Vol. 49, Issue 9
Fast-ion transport by Alfvén eigenmodes above a critical gradient threshold
journal, May 2017
- Heidbrink, W. W.; Collins, C. S.; Podestà, M.
- Physics of Plasmas, Vol. 24, Issue 5
Reduction in Neutral Beam Driven Current in a Tokamak by Tearing Modes
journal, July 1997
- Forest, C. B.; Ferron, J. R.; Gianakon, T.
- Physical Review Letters, Vol. 79, Issue 3
Influence of Energetic Ions on Tearing Modes
journal, February 2011
- Cai, Huishan; Wang, Shaojie; Xu, Yinfeng
- Physical Review Letters, Vol. 106, Issue 7
Phase-space dependent critical gradient behavior of fast-ion transport due to Alfvén eigenmodes
journal, June 2017
- Collins, C. S.; Heidbrink, W. W.; Podestà, M.
- Nuclear Fusion, Vol. 57, Issue 8
MHD induced alpha particle loss in TFTR
journal, September 1999
- Zweben, S. J.; Darrow, D. S.; Fredrickson, E. D.
- Nuclear Fusion, Vol. 39, Issue 9
The improved H-mode at ASDEX Upgrade: a candidate for an ITER hybrid scenario
journal, June 2005
- Staebler, A.; Sips, A. C. C.; Brambilla, M.
- Nuclear Fusion, Vol. 45, Issue 7
Interaction of neoclassical tearing modes with trapped fast ions
journal, November 2001
- Marchenko, V. S.; Lutsenko, V. V.
- Physics of Plasmas, Vol. 8, Issue 11
Real‐time, vibration‐compensated CO 2 interferometer operation on the DIII‐D tokamak
journal, July 1988
- Carlstrom, T. N.; Ahlgren, D. R.; Crosbie, J.
- Review of Scientific Instruments, Vol. 59, Issue 7
Numerical simulations of fast ion loss measurements induced by magnetic islands in the ASDEX Upgrade tokamak
journal, September 2009
- Gobbin, M.; Marrelli, L.; Fahrbach, H. U.
- Nuclear Fusion, Vol. 49, Issue 9
The behaviour of fast ions in tokamak experiments
journal, April 1994
- Heidbrink, W. W.; Sadler, G. J.
- Nuclear Fusion, Vol. 34, Issue 4
Stochastic transport of MeV ions by low‐ n magnetic perturbations*
journal, July 1993
- Mynick, H. E.
- Physics of Fluids B: Plasma Physics, Vol. 5, Issue 7
Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak
journal, May 2016
- Bardóczi, L.; Rhodes, T. L.; Carter, T. A.
- Physics of Plasmas, Vol. 23, Issue 5
Simulations of beam ion transport during tearing modes in the DIII-D tokamak
journal, July 2002
- Carolipio, E. M.; Heidbrink, W. W.; Forest, C. B.
- Nuclear Fusion, Vol. 42, Issue 7
The behaviour of fast ions in tokamak experiments
journal, February 1995
- Heidbrink, W. W.; Sadler, G. J.
- Nuclear Fusion, Vol. 35, Issue 2
Design and operation of the multipulse Thomson scattering diagnostic on DIII‐D (invited)
journal, October 1992
- Carlstrom, T. N.; Campbell, G. L.; DeBoo, J. C.
- Review of Scientific Instruments, Vol. 63, Issue 10
Motional Stark effect upgrades on DIII‐D
journal, January 1995
- Rice, B. W.; Nilson, D. G.; Wróblewski, D.
- Review of Scientific Instruments, Vol. 66, Issue 1
A Code that Simulates Fast-Ion D α and Neutral Particle Measurements
journal, September 2011
- Heidbrink, W. W.; Liu, D.; Luo, Y.
- Communications in Computational Physics, Vol. 10, Issue 3
Compact solid-state neutral particle analyzer in current mode
journal, October 2012
- Zhu, Y. B.; Bortolon, A.; Heidbrink, W. W.
- Review of Scientific Instruments, Vol. 83, Issue 10
Works referencing / citing this record:
Summary of the 27th IAEA Fusion Energy Conference in the categories of EX/W, EX/D, and ICC
journal, September 2019
- Ida, K.
- Nuclear Fusion, Vol. 59, Issue 11
Quantitative modeling of neoclassical tearing mode driven fast ion transport in integrated TRANSP simulations
journal, April 2019
- Bardóczi, L.; Podestà, M.; Heidbrink, W. W.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 5
Influence of deeply trapped energetic ions on tearing modes
journal, June 2019
- Zhang, Xiaoxi; Cai, Huishan; Wang, Zheng-Xiong
- Physics of Plasmas, Vol. 26, Issue 6
Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak
journal, May 2019
- Fang, K. S.; Lin, Z.
- Physics of Plasmas, Vol. 26, Issue 5
Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations
journal, August 2019
- Podestà, M.; Bardóczi, L.; Collins, C. S.
- Nuclear Fusion, Vol. 59, Issue 10