FRP33 　ポスター④　 9月1日 14号館1441教室 10:10-12:10

High-power RF tests of repaired circulator for LIPAc RFQ

○Kouki Hirosawa, Naoya Kubo, Andrea De Franco, Kai Masuda, Keitaro Kondo, Atsushi Kasugai, Masayoshi Sugimoto (QST), Ivan Moya, Francesco Scantamburlo, Yann Carin (F4E), Luis Gonzalez-gallego Sanchez-camacho, Cesar Caballero, Juan Carlos Morales Vega (UGR)

The Linear IFMIF Prototype Accelerator (LIPAc) is the accelerator facility to validate the engineering design of the International Fusion Materials Irradiation Facility (IFMIF). The first stage of the IFMIF accelerator up to 9MeV for 125mA deuteron beam in continuous wave (CW) mode is the design configuration of the LIPAc. The 9.8m long RFQ, which is one of the most important accelerating components despite extremely strong space charge force, is fed by 8 RF drive sources. They are synchronized with the White Rabbit based solution and each include 200kW amplifier system including their circulator. During the RFQ CW commissioning campaign in January 2022, one circulator had frequently arc trouble leading to severe damages at the connection of the inner transition from the coaxial line output of the final tetrode to the strip-line central plate of the circulator. The damaged circulator was repaired at the manufacturer’s factory premises and tests of RF characteristics were performed after its reinstallation in LIPAc. An overview of the encountered challenges and the result of RF tests for the repaired circulator will be reported in this meeting.