Speaker
Description
Compared to DC magnets with constant current, pulsed magnets with instantaneous current flow are superior in terms of energy conservation because the time required to generate Joule heat due to the electrical resistance of the coil is limited. However, the magnetic field distribution that affects beam orbit control cannot be known accurately until the pulse power supply is excited, because the current path through the coil and the load resistance change with time due to the current skin effect, respectively. Therefore, it is difficult to confirm before excitement whether the design is as expected. If a mistake is found, the design must be redone. For this reason, we have introduced model-based development (MBD), which integrates electromagnets and power supplies, whereas previous simulation analysis was performed separately for electromagnets and power supplies. For the simulation, we combined OPERA-3D transient analysis, which has a proven track record in the development of pulsed magnets for the J-PARC accelerator, and MATLAB/Simulink for circuit simulation. The introduction of MBD is expected to reduce the number of actual prototypes and development costs and shorten the development period because highly accurate results can be obtained in a short period of time. In addition, simulation of trouble cases that cannot be covered by verification of actual machines alone is possible, which is expected to improve safety. In this presentation, we will report the evaluation results compared to the actual machine.
