High current and high power fast kicker system conceptual design and technology overview for DeeMe experiment
A US-Japan collaboration for the high energy physics experiment DeeMe requires a multi G VA high deflection strength fast kicker system. A set of high current, high voltage and high power generators are going to drive a series of kicker magnets to deflect passing beam. Brookhaven researchers have been invited to conduct a conceptual design study for this challenging project. The basic option consists of a set of identical modulators, low impedance transmission lines, and large aperture high inductance kicker magnets. Each modulator shall be capable of driving the kicker magnet with an 8kA to 10kA pulsed current. A desired fast pulse full time of 300 to 400 ns is the most challenging part of the design because of the high inductance magnetic load. The after pulse floor ripple tolerance is 5% or best achievable. Pulse repetition rate is 25Hz continuously.
OPERATION AND CURRENT STATUS OF INJECTION , EXTRACTION , KICKER MAGNET AND THE POWER SUPPLY FOR J-PARC 3 GeV RCS
Stable operation is required for 3-GeV Rapid Cycling Synchrotron (RCS) at High Intensity Proton Accelerator Facility (J-PARC). In the kicker system at extraction section of RCS, there were many troubles for unstable operation of the thyratron switches of the power supply just after 25 pulses per seconds (pps) operation started in February 2009. However, the operation was improved by handling thyratrons in appropriate manner in October 2010. After the Great East Japan Earthquake on March 11, 2011, injection and extraction magnets, power supplies, cables and bus-duct were checked. The results of the measurements and the checks were all not in the problem. We have to accomplish extraction beam power of 1 MW in RCS in the near future. Kicker impedance is the most severe among other impedance sources. We adopt that the matching resistor and newly developed diode are connected at the power supply to reduce the impedance. From the beam test, it is found that induced voltages to the kicker are decreased by the diode and the resistor.
A new conceptual design of the SNS full turn fast extraction kicker power supply system
The new conceptual design of the full turn fast extraction kicker power supply system of the Spallation Neutron Source main ring will be presented in this paper. In this design, the extraction kicker power modulators will be located outside of the tunnel, as requested by the SNS Project. Its purpose is to minimize the components inside of the synchrotron tunnel. The high voltage modulator will use Blumlein pulser and hollow-anode thyratron structure, a parallel termination resistor and two transmission cables. Main advantages include: flexible system configuration for unipolar single drive or push-pull double drive of the kicker magnets, lower charging voltage, lower beam impedance, a lower number of high voltage cables, and a large design margin for implementation and future upgrade.