Operating status of the RF cavities in the J-PARC linac

Morishita, Takatoshi  

Accelerators for Accelerator Driven Systems (ADS) are required to have extremely high operational stability to reduce the fluctuations in the thermal load for the subcritical reactor by beam trips. The J-PARC linac, which is also a high-intensity proton accelerator, has been focused on improving the operational stability of the accelerator to achieve both stable beam quality and high availability. Accelerator cavities in the J-PARC linac contain an RFQ, DTLs, SDTLs, and ACS. Beam commissioning started in November 2006 and beam delivery to users started in 2008. To contribute to the development of ADS accelerators, the operating status of RF accelerator cavities in recent years, especially the RF trips that causes a beam stop, and future improvement plans are presented in this workshop. Additionally, the beam stop event such as equipment failure and the details of preventive maintenance will be reported.