Heat Exchanger Can Assembly for Provision of Helium Coolant Streams for Cryomodule Testing below 2K

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Smith, E.N.^1 ; Eichhorn, R.^1 ; Quigley, P.^1 ; Sabol, D.^1 ; Shore, C.^1 ; Widger, D.^1

Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca

NY

14853-5001, United States^1

关键词: Cryogenic temperatures;    Energy recovery;    Helium coolants;    Operating temperature;    Room-temperature operation;    Stainless steel plate;    Superconducting RF cavity;    Temperature rise;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012034/pdf
DOI  :  10.1088/1757-899X/171/1/012034

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A series of heat exchanger can (HXC) assemblies have been designed, constructed and built to utilize existing 4.2 K liquefaction and compressor capabilities to provide helium gas coolant streams of 80 K, 4.5 K, and liquid from 1.6 to 2.0 K for operating cryomodules containing from one to six superconducting RF cavities built for an energy recovery linear accelerator. Designs for the largest assemblies required up to 100 W of cooling at 1.8 K with precise temperature control, especially during cool-down, and up to 2000 W at 80 K (with a 40 K temperature rise). A novel feature of these assemblies was the use of relatively inexpensive brazed stainless steel plate heat exchangers intended for room-temperature operation with water or oil, but which in practice worked well at cryogenic temperatures. The choice of operating temperatures/pressures were to provide single-phase helium flow for better control of coolant distribution in the 80 K and 4.5 K streams, to take advantage of locally elevated heat capacity near the critical point for the 4.5 K stream, and in the region below 2 K to get the best possible Q from the niobium cavities under test.