A small scale remote cooling system for a superconducting cyclotron magnet

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

材料科学;物理学

Haug, F.^2 ; Berkowitz Zamorra, D.^1,2 ; Michels, M.^1,2 ; Gomez Bosch, R.^2 ; Schmid, J.^2 ; Striebel, A.^2 ; Krueger, A.^2 ; Diez, M.^2 ; Jakob, M.^2 ; Keh, M.^2 ; Herberger, W.^2 ; Oesterle, D.^2

Karlsruhe Institute of Technology, Karlsruhe, Germany^1

CERN, Geneva, Switzerland^2

关键词: Design Principles;    Electrical heater;    Radioisotope production;    Refrigeration system;    Research institutes;    Stand-alone modes;    Temperature level;    Two phase helium;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012038/pdf
DOI  :  10.1088/1757-899X/171/1/012038

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Through a technology transfer program CERN is involved in the R&D of a compact superconducting cyclotron for future clinical radioisotope production, a project led by the Spanish research institute CIEMAT. For the remote cooling of the LTc superconducting magnet operating at 4.5 K, CERN has designed a small scale refrigeration system, the Cryogenic Supply System (CSS). This refrigeration system consists of a commercial two-stage 1.5 W @ 4.2 K GM cryocooler and a separate forced flow circuit. The forced flow circuit extracts the cooling power of the first and the second stage cold tips, respectively. Both units are installed in a common vacuum vessel and, at the final configuration, a low loss transfer line will provide the link to the magnet cryostat for the cooling of the thermal shield with helium at 40 K and the two superconducting coils with two-phase helium at 4.5 K. Currently the CSS is in the testing phase at CERN in stand-alone mode without the magnet and the transfer line. We have added a "validation unit" housed in the vacuum vessel of the CSS representing the thermo-hydraulic part of the cyclotron magnet. It is equipped with electrical heaters which allow the simulation of the thermal loads of the magnet cryostat. A cooling power of 1.4 W at 4.5 K and 25 W at the thermal shield temperature level has been measured. The data produced confirm the design principle of the CSS which could be validated.