Technical Overview of the PAL XFEL Low Conductivity Water Cooling System
Bongho Lee# Hyung Gyun Kim, Seung Hwan Kim, Kyung Ryul Kim, Chiwon Sung, Iksu Mok, Jungmu Yang, Mong Soo Lee, Hwa Myung Lee, Young Chan Kim, Kwang Woo Kim, Hiroshi Matsumoto, In Soo Ko, PAL, POSTECH, Korea Jong Heung Jeon, Taeyoung, Korea Kyoung Tae Kim, HMT, Korea Abstract Pohang Accelerator Laboratory (PAL) started operation of an X ray Free Electron Laser (XFEL) based on 10GeV linear accelerator in FY2015. For accurate temperature control of the various XFEL accelerator devices, a lowconductivity water (LCW) cooling system were installed. The LCW pump station generates LCW controlling the temperature variation within 0.1 The LCW is supplied to klystrons including modulators and various control devices. On the other hand, the precision temperature controlled water to minimize temperature variation down to 0.02 This water is supplied to accelerating columns, wave guide and SLED. Therefore, this paper shows the design, construction and operation of the LCW cooling system.