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Author Poli, F. ♦ Wukitch, S. ♦ Taylor, G. ♦ Greenough, N. ♦ Ellis, R.a. ♦ Gerhardt, S. P. ♦ Shiraiwa, S. ♦ Smirnov, A. P. ♦ Hosea, J. C. ♦ Wallace, G. ♦ Parker, R. ♦ Terry, D. ♦ Raman, R. ♦ Harvey, R. W. ♦ Fredd, E.
Source Directory of Open Access Journals (DOAJ)
Content type Text
Publisher EDP Sciences
File Format PDF
Date Created 2015-04-08
Copyright Year ©2015
Language English
Subject Domain (in LCC) QC1-999
Subject Keyword Science ♦ Physics
Abstract The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at axial toroidal fields of ≤ 1 T and plasma currents, Ip ≤ 2 MA. The development of non-inductive (NI) plasmas is a major long-term research goal for NSTX-U. Time dependent numerical simulations of 28 GHz electron cyclotron (EC) heating of low density NI start-up plasmas generated by Coaxial Helicity Injection (CHI) in NSTX-U predict a significant and rapid increase of the central electron temperature (Te(0)) before the plasma becomes overdense. The increased Te(0) will significantly reduce the Ip decay rate of CHI plasmas, allowing the coupling of fast wave heating and neutral beam injection. A megawatt-level, 28 GHz electron heating system is planned for heating NI start-up plasmas in NSTX-U. In addition to EC heating of CHI start-up discharges, this system will be used for electron Bernstein wave (EBW) plasma start-up, and eventually for EBW heating and current drive during the Ip flattop.
ISSN 2100014X
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 2015-01-01
e-ISSN 2100014X
Journal EPJ Web of Conferences
Volume Number 87
Starting Page 02013

Source: Directory of Open Access Journals (DOAJ)