Title :
Efficiency issue in C-band klystron-modulator system for linear collider
Author :
Oh, J.S. ; Cho, M.H. ; Namkung, W. ; Shintake, T. ; Matsumoto, H. ; Watanabe, K. ; Baba, H.
Author_Institution :
PAL/POSTECH, Pohang, South Korea
Abstract :
A C-band (5,712 MHz) RF system for an e+e- linear collider at 500 GeV center-of-mass energy requires total 4,080 units of 50 MW pulse klystrons and matching 111 MW peak-power modulators for two main linacs. An initial design value of the wall plug power for the entire RF system is 150 MW with 2.5 μsec RF pulse width and 100 Hz pulse repetition rate. A detailed circuit analysis shows that it is possible to get the overall RF system efficiency of approximately 24%, or equivalent to 210 MW wall plug power. This includes 85% DC high voltage charging efficiency using compact inverter power supplies, and 70% pulse efficiency using 3.5 μsec pulse length (ESW) with less than 1% flat top ripple, and auxiliary powers for thyratron heater, klystron heater, focusing magnet, pulse transformer reset, and etc
Keywords :
accelerator RF systems; electron accelerators; klystrons; linear colliders; 5.712 MHz; 50 MW; 500 GeV; C-band klystron-modulator system; DC high voltage charging efficiency; RF pulse width; RF system; compact inverter power supplies; focusing magnet; klystron heater; linear collider; pulse repetition rate; pulse transformer reset; thyratron heater; wall plug power; Circuit analysis; Klystrons; Linear accelerators; Plugs; Pulse inverters; Pulse modulation; Pulse transformers; Pulsed power supplies; Radio frequency; Space vector pulse width modulation;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.749775
