Cryogenic thermometry in superconducting accelerators

The cryogenic thermometers used in superconducting accelerators must function over a temperature range of 1.5-300 K in very harsh environments that must be endured for the life of the accelerator. The authors prescribe requirements for cryogenic thermometers in accelerator installations. Thermometer mounting fixtures used in the Joint Institute for Nuclear Research "Nuclotron" (JINR, Dubna, Russia) and the Superconducting Super Collider (SSCL, Dallas, Texas, USA) are described. Experimental results for long-term stability of some cryogenic thermometers and basic recommendations for applications in large superconducting accelerator systems are given.