SCL3 cryogenic plant process design for RAON

摘要

RAON, Rare isotope Accelerator complex for ON-line experiments, is a facility for rare isotope beams in S. Korea. It has three superconducting linear accelerators, SCL1, SCL2, and SCL3. They could serve a broad power range of stable and unstable ion beams. The third superconducting linac, SCL3, which could accelerate rare isotope beams made by an I SOL (Isotope Separation On-Line) facility, consists of three types of cryomodules with two kinds of SC cavities, QWR (Quarter Wave Resonator, 81.25 MHz) and HWR (Half Wave Resonator, 162.5 MHz). A cryogenic plant for SCL3 will cover three cryogenic circuits, bath cooling for QWR at 4.5 K, bath cooling for HWR at 2.05 K, and forced cooling for thermal shields of all cryomodules at 35 - 55 K. ALAT who was a winner in this bidding and has studied our requirements and process designs will supply the cryogenic plant with a helium management system. This paper shows results of the process designs and current status including final heat loads from SCL3, specifications of equipment, a layout, and exergy efficiencies at operating modes.