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Title: Final Report for the FY-2017 Fusion Energy Sciences (FES) Theory and Simulation Performance Target

Abstract

As stated in the language of the FY-2017 FES Theory and Simulation Performance Target, lower hybrid current drive (LHCD) will be indispensable for driving off-axis current during long-pulse operation of future burning plasma experiments including ITER. However, the experimentally demonstrated high efficiency of LHCD is not completely understood because LH waves used in these experiments are typically injected at values of the parallel (along B) phase speed v// that are much greater than the phase speed where linear electron Landau is strongest; namely at v// ~ (2.5-3)×vte, where vte = (2Te/me)1/2. Thus, these wave are expected to be only weakly damped. This turns out to be the case when the background electron temperature is of order Te ~ 3 keV and the parallel refractive index of the LH waves is n// = c/v// ~ 2, which is typical of LHCD experiments in the EAST Tokamak.

Authors:
 [1];  [2];  [3];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. DIDITCO, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
USDOE Office of Science (SC), Washington, D.C. (United States). Fusion Energy Sciences (FES)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1471197
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Lee, J. -P., Batchelor, D. B., Elwasif, W., Frank, S., Wright, J. C., and Bonoli, P. T. Final Report for the FY-2017 Fusion Energy Sciences (FES) Theory and Simulation Performance Target. United States: N. p., 2017. Web. doi:10.2172/1471197.
Lee, J. -P., Batchelor, D. B., Elwasif, W., Frank, S., Wright, J. C., & Bonoli, P. T. Final Report for the FY-2017 Fusion Energy Sciences (FES) Theory and Simulation Performance Target. United States. doi:10.2172/1471197.
Lee, J. -P., Batchelor, D. B., Elwasif, W., Frank, S., Wright, J. C., and Bonoli, P. T. Sun . "Final Report for the FY-2017 Fusion Energy Sciences (FES) Theory and Simulation Performance Target". United States. doi:10.2172/1471197. https://www.osti.gov/servlets/purl/1471197.
@article{osti_1471197,
title = {Final Report for the FY-2017 Fusion Energy Sciences (FES) Theory and Simulation Performance Target},
author = {Lee, J. -P. and Batchelor, D. B. and Elwasif, W. and Frank, S. and Wright, J. C. and Bonoli, P. T.},
abstractNote = {As stated in the language of the FY-2017 FES Theory and Simulation Performance Target, lower hybrid current drive (LHCD) will be indispensable for driving off-axis current during long-pulse operation of future burning plasma experiments including ITER. However, the experimentally demonstrated high efficiency of LHCD is not completely understood because LH waves used in these experiments are typically injected at values of the parallel (along B) phase speed v// that are much greater than the phase speed where linear electron Landau is strongest; namely at v// ~ (2.5-3)×vte, where vte = (2Te/me)1/2. Thus, these wave are expected to be only weakly damped. This turns out to be the case when the background electron temperature is of order Te ~ 3 keV and the parallel refractive index of the LH waves is n// = c/v// ~ 2, which is typical of LHCD experiments in the EAST Tokamak.},
doi = {10.2172/1471197},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {12}
}