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Abstract

IN A CONVENTIONAL, INDUCTIVELY DRIVEN TOKAMAK, THE MAGNITUDE AND DURATION OF THE PLASMA CURRENT FLAT-TOP ARE LIMITED BY THE FLUX AVAILABLE FROM THE OHMIC HEATING (OH) AND EQUILIBRIUM FIELD WINDINGS. TO OVERCOME THIS, A LOWER HYBRID CURRENT DRIVE SYSTEM (LHCD) MAY BE INSTALLED TO DRIVE NON-INDUCTIVE CURRENT. THIS PROVIDES A PLASMA DISCHARGE WITH A VERY LOW POWER DISSIPATION AND HENCE A LONGER BURN. THE DIFFERENT COMPONENTS OF VOLT-SECOND CONSUMPTION ON PETULA HAVE BEEN DETERMINED FOR OH AND LHCD DISCHARGES USING POYNTING'S THEOREM. THIS PERMITS SCALING OF INDUCTIVE AND RESISTIVE FLUXES AND HENCE AN ESTIMATION OF THE VOLT-SECOND SAVING ON JET. CURRENT DRIVE EFFICIENCY IS ANALYSED TO DETERMINE THE MOST EFFECTIVE PLASMA PARAMETERS AND RF WAVE PROPERTIES. A HYBRID (OH-RF) CURRENT RAMP UP IS PROPOSED, USING FASTER CURRENT RAMP AT LOW CURRENT AND SLOWER CURRENT RAMP AT HIGH CURRENT. BY INJECTING 10MW OF RF POWER DURING INITIAL CURRENT RISE-UP A PURE RF CURRENT RAMP UP IS THEORETICALLY POSSIBLE UP TO 2MA FOLLOWED BY A HYBRID CURRENT RAMP-UP FROM 2 TO 7MA, PERMITTING A SAVING OF 12VS AND AN EXTENSION OF THE FLAT-TOP TO 17S. THIS PLASMA CURRENT SHOULD LAST AS LONG AS THE PRESENT TOROIDAL AND EQUILIBRIUM FIELDS ALLOW.

Additional information

Authors: VAN HOUTTE D CEA, CEN, F, CEA, CEN, F
Bibliographic Reference: REPORT EUR-CEA-FC-1338 E, 1988, AVAILABILITY: CEA, CEN, CADARACHE, F
Availability: Can be ordered online
Record Number: 1989126217600 / Last updated on: 1989-04-01
Category: PUBLICATION
Available languages: en