Commissioning and operational results of helium refrigeration system at JLab for the 12GeV upgrade

Conference · Tue Dec 01 00:00:00 EST 2015 · IoP Conf.Ser.Mat.Sci.Eng. (Advances in Cryogenic Engineering: CEC 2015)

DOI:https://doi.org/10.1088/1757-899X/101/1/012125· OSTI ID:1255084

Knudsen, Peter N. ^[1]; Ganni, Venkatarao ^[1]; Dixon, Kelly D. ^[1]; Norton, Robert O. ^[1]; Creel, Jonathan D. ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The new 4.5 K refrigerator system at the Jefferson Lab (JLab) Central Helium Liquefier (CHL-2) for the 12 GeV upgrade was commissioned in late spring of 2013, following the commissioning of the new compressor system, and has been supporting 12 GeV LINAC commissioning since that time. Six design modes were tested during commissioning, consisting of a maximum capacity, nominal capacity, maximum liquefaction, maximum refrigeration, maximum fill and a stand-by/reduced load condition. The maximum capacity was designed to support a 238 g/s, 30 K and 1.16 bar cold compressor return flow, a 15 g/s, 4.5 K liquefaction load and a 12.6 kW, 35-55 K shield load. The other modes were selected to ensure proper component sizing and selection to allow the cold box to operate over a wide range of conditions and capacities. The cold box system is comprised of two physically independent cold boxes with interconnecting transfer-lines. The outside (upper) 300-60 K vertical cold box has no turbines and incorporates a liquid nitrogen pre-cooler and 80-K beds. The inside (lower) 60-4.5 K horizontal cold box houses seven turbines that are configured in four expansion stages including one Joule-Thompson expander and a 20-K bed. The helium compression system has five compressors to support three pressure levels in the cold box. This paper will summarize the analysis of the test data obtained over the wide range of operating conditions and capacities which were tested.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1255084
• Report Number(s): JLAB-ACE-15-2224; DOE/OR/23177-3807
• Journal Information: IoP Conf.Ser.Mat.Sci.Eng. (Advances in Cryogenic Engineering: CEC 2015), Vol. 101; Conference: CEC/ICMC 2015, June 28-July 2, 2015, Tucson, AZ
• Country of Publication: United States
• Language: English