Transient Vacuum study of Electric Arc in Radio Frequency Quadrupole of the Linear Particle Accelerator IFMIF

A transient vacuum study of an electrical discharge at the Radio Frequency Quadrupole (RFQ) of the Linear IFMIF prototype accelerator (LIPAc) was performed using Mo1flow+, a test-particle Monte-Carlo (TPMC) software for ultra-high vacuum systems. In the RFQ there are eight couplers that make possible Radio Frequency (RF) power to be injected. The couplers are known to produce electric arcs in the interior during the RF conditioning. But the relationship between the electric arcs and the pressure readings of the gauges is unclear. The electrical discharge has been simulated as an injection of particles in the surface where it is likely to happen. A 3D model of the vacuum chamber of the RFQ was made and boundary conditions were set. Results have been retrieved for one coupler and they have been contrasted with experimental data in which the presence of this electric arc was known.