Presentation Information
[APP1-03]IMPROVEMENT OF FREQUENCY STABILITY BY MECHANICAL MODIFICATIONS OF CRYOGENIC VALVE IN SUPERCONDUCTING LINAC OF RAON
*Gyuho Lee1, Minki Kim1, Jeahak Han1, Inmyung Park1, Hyunchul Jo1, Junghyun Yoo1, Seojeong Kim1, Jinwook Kim1, Jae Hee Shin1 (1. Institute for Basic Science, Institute for Rare Isotope Science (Korea))
Keywords:
Cryogenic vlave,Superconducting linear accelerator (SCL),Cryomodule,Radio frequency (RF)
The RAON (Rare Isotope Accelerator complex for ON-line experiments) is a heavy-ion accelerator developed at the Institute for Rare Isotope Science (IRIS), using superconducting linear accelerators for efficient ion acceleration. Superconducting Linac 3 (SCL3) has been constructed and is operated under cryogenic conditions to support stable beam acceleration. In this paper, we present the results of mechanical modifications to the cryogenic valve in SCL3, including overhaul of an actuator and joule-thomson (JT) plug replacement. These modifications were implemented to address frequency fluctuations caused by delayed valve response and internal sticking. After maintenance, the measured frequency deviation decreased, and the occurrence of peak frequency fluctuations was reduced compared to the previous operational period. These results suggest that targeted mechanical improvements in cryogenic valve systems can contribute to maintaining RF stability in superconducting accelerators.