POWER-SYSTEM FOR LOWER-HYBRID CURRENT DRIVE OF TOKAMAK FUSION TEST REACTOR ADVANCED PHASE (TFTR-AP)

Lower Hybrid Current Drive (LHCD) Heating is proposed to be provided f or the Tokamak Fusion Test Reactor Advanced Phase (TFTR-AP). The power to be delivered to the plasma is a total additional RF power of 3 MW (4 MW Source Power) at 4.6GHz, divided into two systems of 1.5 MW each . The first system (first phase of the job) is scheduled to be operati onal in April 1997 and the second system (Second phase of the job) by September 97. (The project is now on hold due to funding limitations). The Reactor is expected to operate for three more years with the addi tional equipment. It is proposed to utilize used equipment from the Pr inceton Beta Experiment (PBX) tokamak, Massachusetts Institute of Tech nology (MIT), and Lawrence Livermore National Laboratory (LLNL) wherev er feasible. Power System equipment is also proposed to be taken on lo an from LLNL for the LHCD system. The major concern in the LHCD hardwa re is driven by the new operating duty cycle. The PBX LHCD system was designed for operation for 500 milliseconds every 300 seconds. The sys tem for TFTR requires operation for 3 seconds every 300 seconds. Durin g the Conceptual Design Phase of LHCD for TFTR, the power system compo nents for Electrical Power System were analyzed to verify whether the equipment can meet the new operational requirements with or without mo difications. The Power System is composed of electrical and mechanical systems that convert 13.8 kV prime power to controlled pulsed power r equired for the LHCD system. The major equipment involved are Circuit Breakers, Auto and Rectifier Transformers, Surge Suppression component s, Power Tetrodes, HV Decks, Klystron Amplifiers and Transmission line s. Heat runs are proposed to be conducted for the Power equipment to v erify capability. Other components were analyzed to verify their therm al limitations. This paper describes the Electrical Power System compo nents for the Lower Hybrid Current Drive