Development of pulsed conducting target for high intensity and high luminosity muon beam

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We have studied "conducting pulsed target" for high intensity muon source. By applying large pulsed current, secondary-produced pions would be confined inside the target because of large toroid field. In the end, pions would come out from the end of the target. This scheme would provide much brighter secondary beam with smaller emittance.To realize this new scheme, we have investigated various fields as follows:1. We have determined the basic parameters for the PRISM, a low energy muon source. We first studied mercury target and have developed several equipments: mercury loop, pulsed power supply, and pulse transformer.2. Radiation heating caused by beam-target interaction is one of the key parameters in design of the target. We developed a new technique, so called "cryogenic calorimeter" to measure beam heating precisely and to calibrate Monte Carlo simulation code.3. It is very important to select the target material which could survive under high pulsed current and high intense beam. We have measured mechanical properties for several candidate materials and carefully watch their change when they are irradiated.4. It is very difficult to measure emittance of the beam with large dispersion such as secondary beam. We have developed a new measurement method of beam emittance by measuring track and momentum for each secondary particle.We have studied and obtained lots of essential knowledge to realize the "conducting pulsed target" although we could not carried out proof-of-principle experiments due to the limited time and unavailability of the test beam. We will to continue to work on developing the target technology, on the basis of these accomplishments.