S. Ramakrishnan et al., POWER-SYSTEM FOR LOWER-HYBRID CURRENT DRIVE OF TOKAMAK FUSION TEST REACTOR ADVANCED PHASE (TFTR-AP), Fusion technology, 30(3), 1996, pp. 830-833
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