Abstract
The radiation leakage accident occurred at the J-PARC hadron experimental hall on May 23, 2013 was triggered by a target damage due to an unanticipated beam from the main ring (MR). An extremely short-pulsed beam was extracted from MR by malfunction of the quadrupole (EQ) power supply for a spill feedback. A simulation with the slow extraction process explains such a short beam pulse generation. The cause of the malfunction has been identified by an intensive investigation of the EQ power supply system performed after the accident. We will show the recurrence prevention measures.
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