Cryogenic test facility instrumentation with fiber optic and fiber optic sensors for testing superconducting accelerator magnets

[摘要] The magnets for the next steps in accelerator physics, such as the High Luminosity upgrade of the LHC (HL- LHC) and the Future Circular Collider (FCC), require the development of new technologies for manufacturing and monitoring. To meet the HL-LHC new requirements, a large upgrade of the CERN SM18 cryogenic test facilities is ongoing with the implementation of new cryostats and cryogenic instrumentation. The paper deals with the advances in the development and the calibration of fiber optic sensors in the range 300 - 4 K using a dedicated closed-cycle refrigerator system composed of a pulse tube and a cryogen-free cryostat. The calibrated fiber optic sensors (FOS) have been installed in three vertical cryostats used for testing superconducting magnets down to 1.9 K or 4.2 K and in the variable temperature test bench (100 - 4.2 K). Some examples of FOS measurements of cryostat temperature evolution are presented as well as measurements of strain performed on a subscale of High Temperature Superconducting magnet during its powering tests.

[发布机构] CERN- European Organization for Nuclear Research, Geneva; CH-1211, Switzerland^1;University of Naples Federico II, Napoli; 80138, Italy^2;Optoelectronic Division, Department of Engineering, University of Sannio, Benevento; 82100, Italy^3;Institute Polymers Composites and Biomaterials, Italian National Research Council, Portici; 80125, Italy^4

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Accelerator physics;Cryogenic instrumentation;Cryogenic test facility;High temperature superconducting magnets;New technologies;Super-conducting accelerator magnets;Temperature evolution;Variable temperature