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Title: Fast ion transport during applied 3D magnetic perturbations on DIII-D

Abstract

Measurements show fast ion losses correlated with applied 3D fields in a variety of plasmas ranging from L-mode to resonant magnetic perturbation (RMP) edge localized mode (ELM) suppressed H-mode discharges. In DIII-D L-mode discharges with a slowly rotating n = 2 magnetic perturbation, scintillator detector loss signals synchronized with the applied fields are observed to decay within one poloidal transit time after beam turn-o indicating they arise predominantly from prompt loss orbits. Full orbit following using M3D-C1 calculations of the perturbed fields and kinetic profiles reproduce many features of the measured losses and points to the importance of the applied 3D field phase with respect to the beam injection location in determining the overall impact on prompt beam ion loss. Modeling of these results includes a selfconsistent calculation of the 3D perturbed beam ion birth profiles and scrape-o - layer ionization, a factor found to be essential to reproducing the experimental measurements. Extension of the simulations to full slowing down timescales, including fueling and the effects of drag and pitch angle scattering, show the applied n = 3 RMPs in ELM suppressed H-mode plasmas can induce a significant loss of energetic particles from the core. With the applied n =more » 3 fields, up to 8.4% of the injected beam power is predicted to be lost, compared to 2.7% with axisymmetric fields only. These fast ions, originating from minor radii > 0:7, are predicted to be primarily passing particles lost to the divertor region, consistent with wide field-of-view infrared periscope measurements of wall heating in n = 3 RMP ELM suppressed plasmas. Edge fast ion D (FIDA) measurements also con rm a large change in edge fast ion profile due to the n = 3 fields, where the effect was isolated by using short 50 ms RMP-o periods during which ELM suppression was maintained yet the fast ion profile was allowed to recover. The role of resonances between fast ion drift motion and the applied 3D fields in the context of selectively targeting regions of fast ion phase space is also discussed.« less

Authors:
 [1];  [1];  [2];  [2];  [2];  [3];  [1];  [3];  [1];  [1];  [4];  [5];  [1];  [1];  [3];  [6];  [2];  [6];  [1];  [7]
+ Show Author Affiliations
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Max-Planck-Institut fur Plasmaphysik, Garching (Germany)
  5. Columbia Univ., New York, NY (United States)
  6. Univ. of California, San Diego, CA (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1265640
Alternate Identifier(s):
OSTI ID: 1238896; OSTI ID: 1297647; OSTI ID: 1353119
Report Number(s):
LLNL-JRNL-698519
Journal ID: ISSN 0029-5515; AT1010101; ERAT355
Grant/Contract Number:  
AC05-00OR22725; AC02-09CH11466; AC52-07NA27344; FC02-04ER54698; FG02-04ER54761; FG02-07ER54917; SC-G903402
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 55; Journal Issue: 7; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fast ion transport; 3D magnetic perturbations; prompt beam loss; DIII-D tokamak

Citation Formats

Van Zeeland, Michael A., Ferraro, Nathaniel M., Grierson, Brian A., Heidbrink, William W., Kramer, Gerrit J., Lasnier, Charles J., Pace, David C., Allen, Steve L., Chen, Xi, Evans, Todd E., García-Muñoz, Manuel, Hanson, Jeremy M., Lanctot, Matthew J., Lao, Lang L., Meyer, William H., Moyer, Richard A., Nazikian, Raffi, Orlov, Dmitriy M., Paz-Soldan, Carlos, and Wingen, Andreas. Fast ion transport during applied 3D magnetic perturbations on DIII-D. United States: N. p., 2015. Web. doi:10.1088/0029-5515/55/7/073028.
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Van Zeeland, Michael A., Ferraro, Nathaniel M., Grierson, Brian A., Heidbrink, William W., Kramer, Gerrit J., Lasnier, Charles J., Pace, David C., Allen, Steve L., Chen, Xi, Evans, Todd E., García-Muñoz, Manuel, Hanson, Jeremy M., Lanctot, Matthew J., Lao, Lang L., Meyer, William H., Moyer, Richard A., Nazikian, Raffi, Orlov, Dmitriy M., Paz-Soldan, Carlos, & Wingen, Andreas. Fast ion transport during applied 3D magnetic perturbations on DIII-D. United States. https://doi.org/10.1088/0029-5515/55/7/073028
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Van Zeeland, Michael A., Ferraro, Nathaniel M., Grierson, Brian A., Heidbrink, William W., Kramer, Gerrit J., Lasnier, Charles J., Pace, David C., Allen, Steve L., Chen, Xi, Evans, Todd E., García-Muñoz, Manuel, Hanson, Jeremy M., Lanctot, Matthew J., Lao, Lang L., Meyer, William H., Moyer, Richard A., Nazikian, Raffi, Orlov, Dmitriy M., Paz-Soldan, Carlos, and Wingen, Andreas. Fri . "Fast ion transport during applied 3D magnetic perturbations on DIII-D". United States. https://doi.org/10.1088/0029-5515/55/7/073028. https://www.osti.gov/servlets/purl/1265640.
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@article{osti_1265640,
title = {Fast ion transport during applied 3D magnetic perturbations on DIII-D},
author = {Van Zeeland, Michael A. and Ferraro, Nathaniel M. and Grierson, Brian A. and Heidbrink, William W. and Kramer, Gerrit J. and Lasnier, Charles J. and Pace, David C. and Allen, Steve L. and Chen, Xi and Evans, Todd E. and García-Muñoz, Manuel and Hanson, Jeremy M. and Lanctot, Matthew J. and Lao, Lang L. and Meyer, William H. and Moyer, Richard A. and Nazikian, Raffi and Orlov, Dmitriy M. and Paz-Soldan, Carlos and Wingen, Andreas},
abstractNote = {Measurements show fast ion losses correlated with applied 3D fields in a variety of plasmas ranging from L-mode to resonant magnetic perturbation (RMP) edge localized mode (ELM) suppressed H-mode discharges. In DIII-D L-mode discharges with a slowly rotating n = 2 magnetic perturbation, scintillator detector loss signals synchronized with the applied fields are observed to decay within one poloidal transit time after beam turn-o indicating they arise predominantly from prompt loss orbits. Full orbit following using M3D-C1 calculations of the perturbed fields and kinetic profiles reproduce many features of the measured losses and points to the importance of the applied 3D field phase with respect to the beam injection location in determining the overall impact on prompt beam ion loss. Modeling of these results includes a selfconsistent calculation of the 3D perturbed beam ion birth profiles and scrape-o - layer ionization, a factor found to be essential to reproducing the experimental measurements. Extension of the simulations to full slowing down timescales, including fueling and the effects of drag and pitch angle scattering, show the applied n = 3 RMPs in ELM suppressed H-mode plasmas can induce a significant loss of energetic particles from the core. With the applied n = 3 fields, up to 8.4% of the injected beam power is predicted to be lost, compared to 2.7% with axisymmetric fields only. These fast ions, originating from minor radii > 0:7, are predicted to be primarily passing particles lost to the divertor region, consistent with wide field-of-view infrared periscope measurements of wall heating in n = 3 RMP ELM suppressed plasmas. Edge fast ion D (FIDA) measurements also con rm a large change in edge fast ion profile due to the n = 3 fields, where the effect was isolated by using short 50 ms RMP-o periods during which ELM suppression was maintained yet the fast ion profile was allowed to recover. The role of resonances between fast ion drift motion and the applied 3D fields in the context of selectively targeting regions of fast ion phase space is also discussed.},
doi = {10.1088/0029-5515/55/7/073028},
journal = {Nuclear Fusion},
number = 7,
volume = 55,
place = {United States},
year = {Fri Jun 26 00:00:00 EDT 2015},
month = {Fri Jun 26 00:00:00 EDT 2015}
}
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https://doi.org/10.1088/0029-5515/55/7/073028
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Works referenced in this record:

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    Works referencing / citing this record:

    Loss and redistribution of energetic passing ions with resonant magnetic perturbations
    journal, January 2018

    • Xu, Yingfeng; Guo, Wenfeng; Ye, Lei
    • Physics of Plasmas, Vol. 25, Issue 1
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    Enhanced fast ion prompt loss due to resonant magnetic perturbations in KSTAR
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    • DOI: 10.1063/1.5054178

    Synergy between fast-ion transport by core MHD and test blanket module fields in DIII-D experiments
    journal, July 2015

    Mitigation of Alfvénic activity by 3D magnetic perturbations on NSTX
    journal, July 2016

    The effects of resonant magnetic perturbations and charge-exchange reactions on fast ion confinement and neutron emission in the Mega Amp Spherical Tokamak
    journal, July 2018

    • McClements, K. G.; Tani, K.; Akers, R. J.
    • Plasma Physics and Controlled Fusion, Vol. 60, Issue 9
    • DOI: 10.1088/1361-6587/aad252

    Velocity-space sensitivity and tomography of scintillator-based fast-ion loss detectors
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    • DOI: 10.1088/1361-6587/aad76e

    Characterisation of the fast-ion edge resonant transport layer induced by 3D perturbative fields in the ASDEX Upgrade tokamak through full orbit simulations
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    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
    • DOI: 10.1088/1361-6587/aaef61

    Alfvén eigenmodes and fast ion transport in negative triangularity DIII-D plasmas
    journal, June 2019

    Resonant effects on the loss of energetic trapped ions induced by low- n resonant magnetic perturbations
    journal, October 2019

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