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Title: Survey of heating and current drive for K-DEMO

Here, we present calculations of heating and current drive by neutral injection and by electromagnetic waves in the ion cyclotron, helicon, lower hybrid, and electron cyclotron frequency ranges for the steady state burn conditions in a K-DEMO configuration with $$I_{\rm p}=12.3$$ MA, a = 2.1 m, $$R_{\rm o}=6.8$$ m, $$B_{\rm o}=7.4$$ T, $$ \newcommand{\nebar}{{\overline{n}_{\rm e}}} \nebar=1.1 \times 10^{20}$$ m–3, $T(0)=40$ keV, and $$Z_{\rm eff}=1.5$$ . Lower hybrid wave current drive calculations comprise a 2D scan over poloidal launcher location and launched $$ \newcommand{\Nparallel}{{n_{\Vert}}} \Nparallel$$ , at a fixed frequency of 5 GHz. An ICRF frequency scan over 50–100 MHz is based on an ITER-like ICRF midplane antenna; the absorption calculation includes thermal D, T, He, Ar, and W as well as suprathermal beam ions and alphas. Helicon fast wave performance is surveyed by varying frequency over 0.6–2.5 GHz, launched $$ \newcommand{\Nparallel}{{n_{\Vert}}} \Nparallel$$ from –1.6 to –3, and launcher position from top to bottom on the low-field side. An ITER-like 1 MeV neutral beam system with quasi-tangential geometry is scanned over elevation to vary the targeted minor radius. The electron cyclotron survey varies the frequency (190–300 GHz), launcher poloidal location, and the poloidal and toroidal direction of the launched waves. We report for each system the range of minor radius in which current is driven, the current drive efficiency, the optimal system parameters, and typical profiles of driven current. Electron and ion heating profiles are reported for the ICRF and NBI systems.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. National Fusion Research Institute, Daejeon (Republic of Korea)
Publication Date:
Grant/Contract Number:
AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 3; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; K-DEMO; DEMO; current drive; heating; helicon waves
OSTI Identifier:
1419798

Mikkelsen, D. R., Kessel, C. E., Poli, F. M., Bertelli, N., and Kim, K.. Survey of heating and current drive for K-DEMO. United States: N. p., Web. doi:10.1088/1741-4326/aaa4d2.
Mikkelsen, D. R., Kessel, C. E., Poli, F. M., Bertelli, N., & Kim, K.. Survey of heating and current drive for K-DEMO. United States. doi:10.1088/1741-4326/aaa4d2.
Mikkelsen, D. R., Kessel, C. E., Poli, F. M., Bertelli, N., and Kim, K.. 2018. "Survey of heating and current drive for K-DEMO". United States. doi:10.1088/1741-4326/aaa4d2.
@article{osti_1419798,
title = {Survey of heating and current drive for K-DEMO},
author = {Mikkelsen, D. R. and Kessel, C. E. and Poli, F. M. and Bertelli, N. and Kim, K.},
abstractNote = {Here, we present calculations of heating and current drive by neutral injection and by electromagnetic waves in the ion cyclotron, helicon, lower hybrid, and electron cyclotron frequency ranges for the steady state burn conditions in a K-DEMO configuration with $I_{\rm p}=12.3$ MA, a = 2.1 m, $R_{\rm o}=6.8$ m, $B_{\rm o}=7.4$ T, $ \newcommand{\nebar}{{\overline{n}_{\rm e}}} \nebar=1.1 \times 10^{20}$ m–3, $T(0)=40$ keV, and $Z_{\rm eff}=1.5$ . Lower hybrid wave current drive calculations comprise a 2D scan over poloidal launcher location and launched $ \newcommand{\Nparallel}{{n_{\Vert}}} \Nparallel$ , at a fixed frequency of 5 GHz. An ICRF frequency scan over 50–100 MHz is based on an ITER-like ICRF midplane antenna; the absorption calculation includes thermal D, T, He, Ar, and W as well as suprathermal beam ions and alphas. Helicon fast wave performance is surveyed by varying frequency over 0.6–2.5 GHz, launched $ \newcommand{\Nparallel}{{n_{\Vert}}} \Nparallel$ from –1.6 to –3, and launcher position from top to bottom on the low-field side. An ITER-like 1 MeV neutral beam system with quasi-tangential geometry is scanned over elevation to vary the targeted minor radius. The electron cyclotron survey varies the frequency (190–300 GHz), launcher poloidal location, and the poloidal and toroidal direction of the launched waves. We report for each system the range of minor radius in which current is driven, the current drive efficiency, the optimal system parameters, and typical profiles of driven current. Electron and ion heating profiles are reported for the ICRF and NBI systems.},
doi = {10.1088/1741-4326/aaa4d2},
journal = {Nuclear Fusion},
number = 3,
volume = 58,
place = {United States},
year = {2018},
month = {1}
}