R&D ERL: Cryogenic System

Than, R.

关键词: CATHODES;    CRYOGENICS;    DEWARS;    ELECTRON GUNS;    HEAT EXCHANGERS;    HELIUM;    NITROGEN;    PUMPING;    RF SYSTEMS;    REFRIGERATION;    STORAGE;    SUPERCONDUCTING CAVITY RESONATORS relativistic heavy ion collider;   

DOI  :  10.2172/1013447
RP-ID  :  BNL--90924-2010-IR
PID  :  OSTI ID: 1013447
Others  :  R&D Project: KBCH139
Others  :  Other: KB0202011
Others  :  TRN: US1102644

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The ERL cryogenic system will supply cooling to a super-conducting RF (SCRF) gun and the 5-cell super-conducting RF cavity system that need to be held cold at 2K. The engineering of the cavity cryomodules were carried out by AES in collaboration with BNL. The 2K superfluid bath is produced by pumping on the bath using a sub-atmospheric warm compression system. The cryogenic system makes use of mainly existing equipment relocated from other facilities: a 300W 4.5K coldbox, an 45 g/s screw compressor, a 3800 liter liquid helium storage dewar, a 170 m{sup 3} warm gas storage tank, and a 40,000 liter vertical low pressure liquid nitrogen storage dewar. An existing wet expander obtained from another facility has been added to increase the plant capacity. In order to deliver the required 3 to 4 bar helium to the cryomodules while using up stored liquid capacity at low pressure, a new subcooler will be installed to function as the capacity transfer device. A 2K to 4K recovery heat exchanger is also implemented for each cryomodule to recover refrigeration below 4K, thus maximizing 2K cooling capacity with the given sub-atmospheric pump. No 4K-300K refrigeration recovery is implemented at this time of the returning sub-atmospheric cold vapor, hence the 2K load appears as a liquefaction1 load on the cryogenic plant. A separate LN2 cooling loop supplies liquid nitrogen to the superconducting gun's cathode tip.