A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade

G. Taylor; R. A. Ellis; E. Fredd; S. P. Gerhardt; N. Greenough; R. W. Harvey; J. C. Hosea; R. Parker; F. Poli; R. Raman; S. Shiraiwa; A. P. Smirnov; D. Terry; G. Wallace; S. Wukitch

doi:10.1051/epjconf/20158702013

A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade

G. Taylor, R. A. Ellis, E. Fredd, S. P. Gerhardt, N. Greenough, R. W. Harvey, J. C. Hosea, R. Parker, F. Poli, R. Raman, S. Shiraiwa, A. P. Smirnov, D. Terry, G. Wallace, S. Wukitch

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6 Scopus citations

Abstract

The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at axial toroidal fields of ≤ 1 T and plasma currents, I_p ≤ 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 (T_e(0)) before the plasma becomes overdense. The increased T_e(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 I_p flattop.

Original language	English (US)
Article number	02013
Journal	EPJ Web of Conferences
Volume	87
DOIs	https://doi.org/10.1051/epjconf/20158702013
State	Published - Mar 12 2015
Event	18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2014 - Nara, Japan Duration: Apr 22 2014 → Apr 25 2014

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1051/epjconf/20158702013

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Taylor, G., Ellis, R. A., Fredd, E., Gerhardt, S. P., Greenough, N., Harvey, R. W., Hosea, J. C., Parker, R., Poli, F., Raman, R., Shiraiwa, S., Smirnov, A. P., Terry, D., Wallace, G., & Wukitch, S. (2015). A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade. EPJ Web of Conferences, 87, Article 02013. https://doi.org/10.1051/epjconf/20158702013

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title = "A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade",

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.",

author = "G. Taylor and Ellis, \{R. A.\} and E. Fredd and Gerhardt, \{S. P.\} and N. Greenough and Harvey, \{R. W.\} and Hosea, \{J. C.\} and R. Parker and F. Poli and R. Raman and S. Shiraiwa and Smirnov, \{A. P.\} and D. Terry and G. Wallace and S. Wukitch",

note = "Publisher Copyright: {\textcopyright} Owned by the authors, published by EDP Sciences, 2015.; 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2014 ; Conference date: 22-04-2014 Through 25-04-2014",

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doi = "10.1051/epjconf/20158702013",

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T1 - A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade

AU - Taylor, G.

AU - Ellis, R. A.

AU - Fredd, E.

AU - Gerhardt, S. P.

AU - Greenough, N.

AU - Harvey, R. W.

AU - Hosea, J. C.

AU - Parker, R.

AU - Poli, F.

AU - Raman, R.

AU - Shiraiwa, S.

AU - Smirnov, A. P.

AU - Terry, D.

AU - Wallace, G.

AU - Wukitch, S.

PY - 2015/3/12

Y1 - 2015/3/12

N2 - 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.

AB - 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.

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JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

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T2 - 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2014

Y2 - 22 April 2014 through 25 April 2014

ER -

A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade

Abstract

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