The goal of the proposed Neutron Science Project ( NSP ) at JAERI is to provide a short pulsed proton beam of less than 1µs with an average beam power of 5MW. To achieve such purpose, a proton storage ring operated at 50Hz with 4.17x10 14 protons per pulse at 1.5GeV is required. Two kinds of a lattice are examined as a lattice of the proton storage ring for neutron science project. One is FODO lattice and the other is Triple Bend Achromatic (TBA) lattice. This paper describes preliminary results of the lattice design for the proton storage ring.
In order to realize high intense operations in proton synchrotrons, a large ring acceptance is commonly required. In such a machine, intrinsic nonlinear magnetic fields play a significant role, and induced high-order resonances can strongly limit the betatron tunability. In such a situation, a clear understanding of a betatron tune change during the revolution, such as chromatic tune shift, space-charge incoherent tune shift and tune shift caused by magnetic field tracking errors, is a key issue. In this paper, we show results from space-charge simulations introducing magnetic field tracking errors and discuss the combined effects of various tune shifts on beam dynamics for the J-PARC 3-GeV rapid-cycling synchrotron.
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