First results of ion cyclotron resonance heating on ASDEX upgrade

Conference · Sat Oct 15 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6683328

Noterdaeme, J; Hoffmann, C; Brambilla, M; Buechl, K; Eberhagen, A; Field, A; Fuchs, C; Gehre, O; Gernhardt, J; Gruber, O; Haas, G; Hermann, A; Hofmeister, F; Kallenbach, A; Lieder, G; Mertens, V; Murmann, H; de Pena Hempel, S; Poschenrieder, W; Richter, T ; Ryter, F; Salmon, N; Salzmann, H; Schneider, W; Wesner, F; Zehrfeld, H; Zohm, H ^[1]

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1. Max-Planck-Institute for Plasmaphysics, D-8046 Garching (Germany)

ASDEX Upgrade is equipped with an ICRH system consisting of 4 generators of 2 MW power each and 4 double loop antennas. The generators, tuneable in frequency from 30 to 120 MHz, cover several heating scenarios over a wide range of magnetic fields (1 T[lt]B[sub t][lt]3.9 T): minority heating of H and He[sub 3] and second harmonic heating of H and D. ICRH-heated discharges in ASDEX Upgrade were so far carried out mainly at 30 MHz and a magnetic field of 2 T (H minority in D and He). Peak powers of 2.4 MW and pulse length up to 2.5 s were achieved (total energy 3.75 MJ). In L-mode, the density on turn-on of the ICRH stays constant, or even decreases. The ratio of radiated power to total input power is unchanged (60% in an unboronized machine, 30% in a freshly boronized machine) between Ohmic and ICRH phases. The electron temperature increases with 0.9 MW from 1 to 1.25 keV, the loop voltage drops. Transitions to the H-mode were easily and reliably achieved with ICRH alone (necessary ICRH power as low as 0.9 MW) and the length of the ELMy H-mode phases was limited only by the applied ICRH pulse length (ELMy H-mode phases of up to 2 s were achieved). The paper presents further results on heating and confinement in L and H-mode, antenna and edge studies and on divertor measurements. Preliminary experiments, performed with a combination of H minority heating (30 MHz) and H second harmonic (60 MHz) in 600 kA He and D discharges (H minority in the 5 to 20% range) at 2 T, and with non-resonant heating (30 MHz and 60 MHz at 1.35 T) are briefly discussed.

• OSTI ID: 6683328
• Report Number(s): CONF-9304112--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 289:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350 -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
700460* -- Fusion Technology-- Heating & Fueling Systems
ANNULAR SPACE
ASDEX TOKAMAK
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
CONFINEMENT
DEUTERIUM
DIVERTORS
ELEMENTS
EVEN-ODD NUCLEI
Fu
Fuels-- (1992)
H-MODE PLASMA CONFINEMENT
HEATING
HELIUM 3
HELIUM ISOTOPES
HIGH-FREQUENCY HEATING
HYDROGEN
HYDROGEN ISOTOPES
ICR HEATING
ISOTOPES
LIGHT NUCLEI
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PLASMA CONFINEMENT
PLASMA HEATING
SPACE
STABLE ISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION