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Title: High power heating and current drive experiments with EC waves in FTU tokamak

Abstract

The EC system at 140 Ghz, 2 MW, being implemented on FTU tokamak for performing electron heating, profile control and current drive, is composed by four gyrotrons with 0.5 s pulse length capability, and four hybrid mirror/waveguide transmission lines. The launching system is capable of poloidal/toroidal beam steering through a set of tiltable in-vacuum mirrors, coupling to the O-mode at the fundamental resonance, with full control of the e.m. field polarization. Experiments have been made with two gyrotrons, by launching 0.8 MW to the plasma. In the high density regime (local n{sub e} from {approx_equal}0.8 up to 2 10{sup 20} m{sup -3}) the e-i energy transfer is significant, and ion heating is observed through the enhancement of the neutron emission in Deuterium plasmas. The highest electron heating is observed when on-axis ECRH is performed in the current ramp-up, sawtooth-free phase. In steady-state conditions, saw-tooth period is increased up to stabilization by off-axis ECRH. Localized ECCD is also performed to assist in the shaping of the current density profile.

Authors:
; ; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ; ;  [2]
  1. Instituto di Fisica del Plasma del CNR, Associazione EURATOM-ENEA-CNR, Via R. Cozzi 53, Milano (Italy)
  2. Centro Ricerche Energia ENEA-Frascati-Associazione EURATOM-ENEA-CNR sulla Fusione (Italy) (and others)
Publication Date:
OSTI Identifier:
21210455
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Conference: 13. topical conference on radio frequency power in plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: DOI: 10.1063/1.59734; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COUPLING; CURRENT DENSITY; DEUTERIUM; ECR CURRENT DRIVE; ECR HEATING; ELECTRIC CURRENTS; ELECTRON TEMPERATURE; FT TOKAMAK; GHZ RANGE; ION TEMPERATURE; MICROWAVE AMPLIFIERS; NEUTRON EMISSION; PLASMA; PLASMA DENSITY; PLASMA INSTABILITY; POLARIZATION; RF SYSTEMS; SAWTOOTH OSCILLATIONS; STEADY-STATE CONDITIONS

Citation Formats

Cirant, S., Airoldi, A., Bruschi, A., Gandini, F., Granucci, G., Lazzaro, E., Nowak, S., Ramponi, G., Simonetto, A., Sozzi, C., Bertalot, L., Bracco, G., Buratti, P., Crisanti, F., Esposito, B., Gabellieri, L., Kroegler, H., Pacella, D., Panaccione, L., and Tudisco, O. High power heating and current drive experiments with EC waves in FTU tokamak. United States: N. p., 1999. Web. doi:10.1063/1.59734.
Cirant, S., Airoldi, A., Bruschi, A., Gandini, F., Granucci, G., Lazzaro, E., Nowak, S., Ramponi, G., Simonetto, A., Sozzi, C., Bertalot, L., Bracco, G., Buratti, P., Crisanti, F., Esposito, B., Gabellieri, L., Kroegler, H., Pacella, D., Panaccione, L., & Tudisco, O. High power heating and current drive experiments with EC waves in FTU tokamak. United States. doi:10.1063/1.59734.
Cirant, S., Airoldi, A., Bruschi, A., Gandini, F., Granucci, G., Lazzaro, E., Nowak, S., Ramponi, G., Simonetto, A., Sozzi, C., Bertalot, L., Bracco, G., Buratti, P., Crisanti, F., Esposito, B., Gabellieri, L., Kroegler, H., Pacella, D., Panaccione, L., and Tudisco, O. Mon . "High power heating and current drive experiments with EC waves in FTU tokamak". United States. doi:10.1063/1.59734.
@article{osti_21210455,
title = {High power heating and current drive experiments with EC waves in FTU tokamak},
author = {Cirant, S. and Airoldi, A. and Bruschi, A. and Gandini, F. and Granucci, G. and Lazzaro, E. and Nowak, S. and Ramponi, G. and Simonetto, A. and Sozzi, C. and Bertalot, L. and Bracco, G. and Buratti, P. and Crisanti, F. and Esposito, B. and Gabellieri, L. and Kroegler, H. and Pacella, D. and Panaccione, L. and Tudisco, O.},
abstractNote = {The EC system at 140 Ghz, 2 MW, being implemented on FTU tokamak for performing electron heating, profile control and current drive, is composed by four gyrotrons with 0.5 s pulse length capability, and four hybrid mirror/waveguide transmission lines. The launching system is capable of poloidal/toroidal beam steering through a set of tiltable in-vacuum mirrors, coupling to the O-mode at the fundamental resonance, with full control of the e.m. field polarization. Experiments have been made with two gyrotrons, by launching 0.8 MW to the plasma. In the high density regime (local n{sub e} from {approx_equal}0.8 up to 2 10{sup 20} m{sup -3}) the e-i energy transfer is significant, and ion heating is observed through the enhancement of the neutron emission in Deuterium plasmas. The highest electron heating is observed when on-axis ECRH is performed in the current ramp-up, sawtooth-free phase. In steady-state conditions, saw-tooth period is increased up to stabilization by off-axis ECRH. Localized ECCD is also performed to assist in the shaping of the current density profile.},
doi = {10.1063/1.59734},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}