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Title: An ITPA joint experiment to study runaway electron generation and suppression

Abstract

Recent results from an ITPA joint experiment to study the onset, growth, and decay of relativistic electrons (REs) indicate that loss mechanisms other than collisional damping may play a dominant role in the dynamics of the RE population, even during the quiescent Ip flattop. Understanding the physics of RE growth and mitigation is motivated by the theoretical prediction that disruptions of full-current (15 MA) ITER discharges could generate up to 10 MA of REs with 10-20 MeV energies. The ITPA MHD group is conducting a joint experiment to measure the RE detection threshold conditions on a number of tokamaks under quasi-steady-state conditions in which V loop, n e, and REs can be well-diagnosed and compared to collisional theory. Data from DIII-D, C-Mod, FTU, KSTAR, and TEXTOR have been obtained so far, and the consensus to date is that the threshold E-field is significantly higher than predicted by relativistic collisional theory, or conversely, the density required to damp REs is significantly less than predicted, which could have significant implications for RE mitigation on ITER.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Associazione Euratom-ENEA sulla Fusione, C.R. Frascati, Roma (Italy)
  3. National Fusion Research Inst., Daejeon (Korea); Univ. of Science and Technology, Daejeon (Korea). Dept. of Nuclear Fusion and Plasma Science
  4. Forschungszentrum Julich (Germany). Inst. fur Energie- und Klimaforschung (IEK)-Plasmaphysik
  5. ITER Organization, St. Paul Lez Durance (France)
  6. Univ. Carlos III de Madrid (Spain)
  7. Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
  8. National Fusion Research Inst., Daejeon (Korea)
  9. General Atomics, San Diego, CA (United States)
  10. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
ITPA MHD Group
OSTI Identifier:
1376053
Grant/Contract Number:  
FC02-04ER54698; FC02-99ER54512; AC05-06OR23100
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Runaway electrons; Tokamaks; Hard X-rays; Collision theories; Electron energy loss spectroscopy

Citation Formats

Granetz, Robert S., Esposito, B., Kim, J. H., Koslowski, R., Lehnen, M., Martin-Solis, J. R., Paz-Soldan, Carlos, Rhee, T., Wesley, J. C., and Zeng, L.. An ITPA joint experiment to study runaway electron generation and suppression. United States: N. p., 2014. Web. doi:10.1063/1.4886802.
Granetz, Robert S., Esposito, B., Kim, J. H., Koslowski, R., Lehnen, M., Martin-Solis, J. R., Paz-Soldan, Carlos, Rhee, T., Wesley, J. C., & Zeng, L.. An ITPA joint experiment to study runaway electron generation and suppression. United States. doi:10.1063/1.4886802.
Granetz, Robert S., Esposito, B., Kim, J. H., Koslowski, R., Lehnen, M., Martin-Solis, J. R., Paz-Soldan, Carlos, Rhee, T., Wesley, J. C., and Zeng, L.. Fri . "An ITPA joint experiment to study runaway electron generation and suppression". United States. doi:10.1063/1.4886802. https://www.osti.gov/servlets/purl/1376053.
@article{osti_1376053,
title = {An ITPA joint experiment to study runaway electron generation and suppression},
author = {Granetz, Robert S. and Esposito, B. and Kim, J. H. and Koslowski, R. and Lehnen, M. and Martin-Solis, J. R. and Paz-Soldan, Carlos and Rhee, T. and Wesley, J. C. and Zeng, L.},
abstractNote = {Recent results from an ITPA joint experiment to study the onset, growth, and decay of relativistic electrons (REs) indicate that loss mechanisms other than collisional damping may play a dominant role in the dynamics of the RE population, even during the quiescent Ip flattop. Understanding the physics of RE growth and mitigation is motivated by the theoretical prediction that disruptions of full-current (15 MA) ITER discharges could generate up to 10 MA of REs with 10-20 MeV energies. The ITPA MHD group is conducting a joint experiment to measure the RE detection threshold conditions on a number of tokamaks under quasi-steady-state conditions in which Vloop, ne, and REs can be well-diagnosed and compared to collisional theory. Data from DIII-D, C-Mod, FTU, KSTAR, and TEXTOR have been obtained so far, and the consensus to date is that the threshold E-field is significantly higher than predicted by relativistic collisional theory, or conversely, the density required to damp REs is significantly less than predicted, which could have significant implications for RE mitigation on ITER.},
doi = {10.1063/1.4886802},
journal = {Physics of Plasmas},
number = 7,
volume = 21,
place = {United States},
year = {Fri Jul 11 00:00:00 EDT 2014},
month = {Fri Jul 11 00:00:00 EDT 2014}
}

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