Engineering topics

Yang, Shirley

Publications and source records attributed to Yang, Shirley.

2 records

DOE OSTI2023

End Station Refrigerator 2 Cryoplant at JLAB

The future operation of the 4 kW 15 Kelvin MOLLER experiment at Jefferson lab necessitates an increase of cryogenic capacity at the End Station Refrigerator. The current plant is the former 1.5 kW (4.5 K) ESCAR plant that has been operating at Jefferson Lab since 1995. The existing 1.5 kW plant is not able to support the load for MOLLER and will be replaced with a refurbished plant comprised of the cold box and compressors of the 4 kW ASST-A plant from the Superconducting Super Collider in Texas. This paper outlines the assembly, repair and modifications made to the cold box, along with the design of the plant as a whole and its integration into the existing distribution system.

Perry, Christopher↗

DOE OSTI2019

CHL1 2K COLD BOX REPLACEMENT

There is growing evidence showing that the cold compressors in the Modified Sub-atmospheric Cold Box (SC1/SCM) of the JLab Central Helium Liquefier (CHL) are approaching the end of their life. Their replacement parts are no longer available due to obsolescence, thus placing the Physics program at serious risk. A new sub-atmospheric cold box (SC1R), which hosts five technologically superior, water-cooled cold compressors and a similar 4K-2K refrigeration recovery heat exchanger, was funded in July 2017, to replace the existing 2K cold box. The design of the new 2K cold box and the external support system have been completed allowing the project to enter the fabrication and assembly phase, which will be completed here at JLab. We present the design, fabrication, installation and commissioning schedule of the new 2K cold box.

Yang, Shirley↗