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

Journal Article · Mon Sep 20 00:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59734· OSTI ID:21210455

Cirant, S; Airoldi, A; Bruschi, A; Gandini, F; Granucci, G; Lazzaro, E; Nowak, S; Ramponi, G; Simonetto, A; Sozzi, C ^[1]; Bertalot, L; Bracco, G; Buratti, P; Crisanti, F; Esposito, B; Gabellieri, L; Kroegler, H; Pacella, D; Panaccione, L; Tudisco, O ^[2]

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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)

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.

• OSTI ID: 21210455
• Journal Information: AIP Conference Proceedings, Vol. 485, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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