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Commissioning of a replacement subatmospheric cold box for Jefferson Lab’s Central Helium Liquefier

Conference · · IOP Conference Series. Materials Science and Engineering
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Jefferson Lab’s Cryogenics Department has designed, fabricated, installed, and commissioned a new subatmospheric cold box to replace one of the two existing units within our Central Helium Liquefier (CHL). The replacement cold box, dubbed SC1R, pumps saturated helium vapor at 0.0385 atm from Jefferson Lab’s continuous electron beam accelerator facility (CEBAF) cryomodules to maintain an operating temperature of nominally 2.1 K. This is accomplished using a five-stage cryogenic centrifugal compressor (cold compressor) system and a brazed aluminum plate-fin heat exchanger operating between 2.1 K and 4.5 K. In this paper we will describe our experience commissioning the SC1R cold box. We will discuss pump-down of the system to 2.1 K and steady-state operation at the cold compressor design flow rates of 170, 200, and 250 g/s. Performance of the heat exchanger and cold compressors has been mapped across a range of flow rates and optimized for CEBAF operations. This commissioning data will be used to monitor future performance and adapt to changing load requirements.

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:
1972807
Report Number(s):
JLAB-ACE-22-1; DOE/OR/23177-5294
Journal Information:
IOP Conference Series. Materials Science and Engineering, Vol. 1240, Issue 1; Conference: IOP Conference Series: Materials Science and Engineering, Advances in Cryogenic Engineering: Proceedings of the Cryogenic Engineering Conference (CEC) 2021, 19-23 July 2021, Virtual Conference, USA; ISSN 1757-8981
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English

References (5)

Commissioning and operational results of the 12 GeV helium compression system at JLab journal December 2015
Commissioning and operational results of helium refrigeration system at JLab for the 12GeV upgrade journal December 2015
Jlab Chl1 2K Cold Box Replacement journal March 2020
Determination of the Optimal Operating Parameters for the Jefferson Lab’s Cryogenic Cold Compressor System conference January 2004
Design, fabrication, commissioning, and testing of a 250 g/s, 2-K helium cold compressor system
  • Ganni, V.
  • ADVANCES IN CRYOGENIC ENGINEERING: Proceedings of the Cryogenic Engineering Conference - CEC, AIP Conference Proceedings https://doi.org/10.1063/1.1472033
conference January 2002

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