The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - UNPB AU - Liu, Y. AU - Ikegami, M. AU - Maruta, T. AU - Miura, A. AU - Miyao, T. AU - Plostinar, D.C. ED - Eshraqi, Mohammad ED - Trahern, Garry ED - Schaa, Volker RW TI - Experimental Investigation of Emittance Exchange in J-PARC Linac With Non-Equipartitioning Setting J2 - Proc. of HB2016, Malmö, Sweden, July 3-8, 2016 C1 - Malmö, Sweden T2 - ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams T3 - 57 LA - english AB - J-PARC is on the way to 1 MW operation step by step. J-PARC linac complected upgrade to 50 mA/400MeV in 2014, and the next main tasks of beam study are to optimize beam loss and output emittance for 40 mA and 50 mA operation. Residue radiation level at a lower repetition predicted that the beam loss becomes close to the maintenance limit in case of full operation at 50 mA. And intra-beam stripping (IBSt) effect in the H⁻ beam is found to be the dominant source of the beam loss here. IBSt is only sensitive to lattice, so that the only solution is to be away from J-PARC baseline design with equipartitioning condition, in a safe way. In the previous work, emittace exchange and break of periodicity were predicted by the simulation and they are consistent with the "Hofmann chart". Series of experiments were carried out, not only for investigation of new lattice with controlled beam loss and emittance but also for a better understanding of rules of lattice optimization and the physics behind. PB - JACoW CP - Geneva, Switzerland ER -