Three turn secondary for the prototype SLAC solid state induction modulator

The Next Linear Collider accelerator proposal at SLAC requires a high efficiency, highly reliable, and low cost pulsed power modulator to drive the X band klystrons. The present NLC envisions a solid state induction modulator design to drive up to 8 klystrons to 500 kV for 3(S) at 120 PPS with one modulator (>1000 megawatt pulse, 500 kW average). A prototype modulator is under construction, which will power 4 each 5045 SLAC klystron to greater than 380 kV for 3(S) (>600 megawatt pulse, >300 kW ave.). The prototype induction modulator utilizes a three-turn secondary to produce the 500 kV pulse. The design, installation and testing of the three turn secondary and its effect on rise time and fault conditions is discussed. The design and implementation of a snubber to improve the arcing condition are covered.