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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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.

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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

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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

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Y2 - 10 March 2008 through 13 March 2008

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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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