Modeling results for proposed NSTX 28 GHz ECH/EBWH system

G. Taylor; S. J. Diem; R. A. Ellis; E. Fredd; N. Greenough; J. C. Hosea; T. S. Bigelow; J. B. Caughman; D. A. Rasmussen; P. Ryan; J. B. Wilgen; R. W. Harvey; A. P. Smirnov; J. Preinhaelter; J. Urban; A. K. Ram

doi:10.1142/9789812814647_0073

Modeling results for proposed NSTX 28 GHz ECH/EBWH system

G. Taylor
, S. J. Diem
, R. A. Ellis
, E. Fredd
, N. Greenough
, J. C. Hosea
, T. S. Bigelow
, J. B. Caughman
, D. A. Rasmussen
, P. Ryan
, J. B. Wilgen
, R. W. Harvey
, A. P. Smirnov
, J. Preinhaelter
, J. Urban
, A. K. Ram

Fusion Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

A 28 GHz electron cyclotron heating (ECH) and electron Bernstein wave heating (EBWH) system has been proposed for installation on the National Spherical Torus Experiment (NSTX). A 350 kW gyrotron connected to a fixed horn antenna is proposed for ECH-assisted solenoid-free plasma startup. Modeling predicts strong first pass on-axis EC absorption, even for low electron temperature, T_e ∼ 20 eV, Coaxial Helicity Injection (CHI) startup plasmas. ECH will heat the CHI plasma to T_e ∼ 300 eV, providing a suitable target plasma for 30 MHz high-harmonic fast wave heating. A second gyrotron and steered O-X-B mirror launcher is proposed for EBWH experiments. Radiometric measurements of thermal EBW emission detected via B-X-O coupling on NSTX support implementation of the proposed system. 80% B-X-O coupling efficiency was measured in L-mode plasmas and 60% B-X-O coupling efficiency was recently measured in H-mode plasmas conditioned with evaporated lithium. Modeling predicts local on-axis EBW heating and current drive using 28 GHz power in β ∼ 20% NSTX plasmas should be possible, with current drive efficiencies ∼40 kA/MW.

Original language	English
Title of host publication	Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15
Publisher	World Scientific Publishing Co. Pte Ltd
Pages	509-514
Number of pages	6
ISBN (Print)	9812814639, 9789812814630
DOIs	https://doi.org/10.1142/9789812814647_0073
State	Published - 2009
Event	15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008 - Yosemite Village, CA, United States Duration: Mar 10 2008 → Mar 13 2008

Publication series

Name	Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15

Conference

Conference	15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008
Country/Territory	United States
City	Yosemite Village, CA
Period	03/10/08 → 03/13/08

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10.1142/9789812814647_0073

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Taylor, G., Diem, S. J., Ellis, R. A., Fredd, E., Greenough, N., Hosea, J. C., Bigelow, T. S., Caughman, J. B., Rasmussen, D. A., Ryan, P., Wilgen, J. B., Harvey, R. W., Smirnov, A. P., Preinhaelter, J., Urban, J., & Ram, A. K. (2009). Modeling results for proposed NSTX 28 GHz ECH/EBWH system. In Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15 (pp. 509-514). (Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15). World Scientific Publishing Co. Pte Ltd. https://doi.org/10.1142/9789812814647_0073

Taylor, G. ; Diem, S. J. ; Ellis, R. A. et al. / Modeling results for proposed NSTX 28 GHz ECH/EBWH system. Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15. World Scientific Publishing Co. Pte Ltd, 2009. pp. 509-514 (Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15).

@inproceedings{11e750a747f44de6bfdde55c1a0cf34f,

title = "Modeling results for proposed NSTX 28 GHz ECH/EBWH system",

abstract = "A 28 GHz electron cyclotron heating (ECH) and electron Bernstein wave heating (EBWH) system has been proposed for installation on the National Spherical Torus Experiment (NSTX). A 350 kW gyrotron connected to a fixed horn antenna is proposed for ECH-assisted solenoid-free plasma startup. Modeling predicts strong first pass on-axis EC absorption, even for low electron temperature, Te ∼ 20 eV, Coaxial Helicity Injection (CHI) startup plasmas. ECH will heat the CHI plasma to Te ∼ 300 eV, providing a suitable target plasma for 30 MHz high-harmonic fast wave heating. A second gyrotron and steered O-X-B mirror launcher is proposed for EBWH experiments. Radiometric measurements of thermal EBW emission detected via B-X-O coupling on NSTX support implementation of the proposed system. 80\% B-X-O coupling efficiency was measured in L-mode plasmas and 60\% B-X-O coupling efficiency was recently measured in H-mode plasmas conditioned with evaporated lithium. Modeling predicts local on-axis EBW heating and current drive using 28 GHz power in β ∼ 20\% NSTX plasmas should be possible, with current drive efficiencies ∼40 kA/MW.",

author = "G. Taylor and Diem, \{S. J.\} and Ellis, \{R. A.\} and E. Fredd and N. Greenough and Hosea, \{J. C.\} and Bigelow, \{T. S.\} and Caughman, \{J. B.\} and Rasmussen, \{D. A.\} and P. Ryan and Wilgen, \{J. B.\} and Harvey, \{R. W.\} and Smirnov, \{A. P.\} and J. Preinhaelter and J. Urban and Ram, \{A. K.\}",

year = "2009",

doi = "10.1142/9789812814647\_0073",

language = "English",

isbn = "9812814639",

series = "Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15",

publisher = "World Scientific Publishing Co. Pte Ltd",

pages = "509--514",

booktitle = "Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15",

note = "15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008 ; Conference date: 10-03-2008 Through 13-03-2008",

}

Taylor, G, Diem, SJ, Ellis, RA, Fredd, E, Greenough, N, Hosea, JC, Bigelow, TS , Caughman, JB, Rasmussen, DA, Ryan, P, Wilgen, JB, Harvey, RW, Smirnov, AP, Preinhaelter, J, Urban, J & Ram, AK 2009, Modeling results for proposed NSTX 28 GHz ECH/EBWH system. in Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15. Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15, World Scientific Publishing Co. Pte Ltd, pp. 509-514, 15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008, Yosemite Village, CA, United States, 03/10/08. https://doi.org/10.1142/9789812814647_0073

Modeling results for proposed NSTX 28 GHz ECH/EBWH system. / Taylor, G.; Diem, S. J.; Ellis, R. A. et al.
Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15. World Scientific Publishing Co. Pte Ltd, 2009. p. 509-514 (Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Modeling results for proposed NSTX 28 GHz ECH/EBWH system

AU - Taylor, G.

AU - Diem, S. J.

AU - Ellis, R. A.

AU - Fredd, E.

AU - Greenough, N.

AU - Hosea, J. C.

AU - Bigelow, T. S.

AU - Caughman, J. B.

AU - Rasmussen, D. A.

AU - Ryan, P.

AU - Wilgen, J. B.

AU - Harvey, R. W.

AU - Smirnov, A. P.

AU - Preinhaelter, J.

AU - Urban, J.

AU - Ram, A. K.

PY - 2009

Y1 - 2009

N2 - A 28 GHz electron cyclotron heating (ECH) and electron Bernstein wave heating (EBWH) system has been proposed for installation on the National Spherical Torus Experiment (NSTX). A 350 kW gyrotron connected to a fixed horn antenna is proposed for ECH-assisted solenoid-free plasma startup. Modeling predicts strong first pass on-axis EC absorption, even for low electron temperature, Te ∼ 20 eV, Coaxial Helicity Injection (CHI) startup plasmas. ECH will heat the CHI plasma to Te ∼ 300 eV, providing a suitable target plasma for 30 MHz high-harmonic fast wave heating. A second gyrotron and steered O-X-B mirror launcher is proposed for EBWH experiments. Radiometric measurements of thermal EBW emission detected via B-X-O coupling on NSTX support implementation of the proposed system. 80% B-X-O coupling efficiency was measured in L-mode plasmas and 60% B-X-O coupling efficiency was recently measured in H-mode plasmas conditioned with evaporated lithium. Modeling predicts local on-axis EBW heating and current drive using 28 GHz power in β ∼ 20% NSTX plasmas should be possible, with current drive efficiencies ∼40 kA/MW.

AB - A 28 GHz electron cyclotron heating (ECH) and electron Bernstein wave heating (EBWH) system has been proposed for installation on the National Spherical Torus Experiment (NSTX). A 350 kW gyrotron connected to a fixed horn antenna is proposed for ECH-assisted solenoid-free plasma startup. Modeling predicts strong first pass on-axis EC absorption, even for low electron temperature, Te ∼ 20 eV, Coaxial Helicity Injection (CHI) startup plasmas. ECH will heat the CHI plasma to Te ∼ 300 eV, providing a suitable target plasma for 30 MHz high-harmonic fast wave heating. A second gyrotron and steered O-X-B mirror launcher is proposed for EBWH experiments. Radiometric measurements of thermal EBW emission detected via B-X-O coupling on NSTX support implementation of the proposed system. 80% B-X-O coupling efficiency was measured in L-mode plasmas and 60% B-X-O coupling efficiency was recently measured in H-mode plasmas conditioned with evaporated lithium. Modeling predicts local on-axis EBW heating and current drive using 28 GHz power in β ∼ 20% NSTX plasmas should be possible, with current drive efficiencies ∼40 kA/MW.

UR - https://www.scopus.com/pages/publications/84903824211

U2 - 10.1142/9789812814647_0073

DO - 10.1142/9789812814647_0073

M3 - Conference contribution

AN - SCOPUS:84903824211

SN - 9812814639

SN - 9789812814630

T3 - Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15

SP - 509

EP - 514

BT - Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15

PB - World Scientific Publishing Co. Pte Ltd

T2 - 15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008

Y2 - 10 March 2008 through 13 March 2008

ER -

Taylor G, Diem SJ, Ellis RA, Fredd E, Greenough N, Hosea JC et al. Modeling results for proposed NSTX 28 GHz ECH/EBWH system. In Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15. World Scientific Publishing Co. Pte Ltd. 2009. p. 509-514. (Proceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15). doi: 10.1142/9789812814647_0073

Modeling results for proposed NSTX 28 GHz ECH/EBWH system

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