Refrigerators for Superconducting Accelerators and Auxiliary Experimental Equipment
The Stanford Linear Accelerator is two miles long and operates at a temperature of 318°K. At 360 pps @ 1.5 µsec its duty cycle is 0.0005. Electron beam energies of up to 23 GeV have been obtained. If converted to superconducting operation at temperatures from 1.0 to 1.85°K, it has been estimated that its duty cycle would be 1.0 at 20 GeV and 0.06 at 100 GeV . To do this would require new modulators, new klystrons, a new 2-mile-long accelerator disk-loaded wave guide of superconducting material located within heat-shielded dewars capable of imparting 33 MeV/m to electron beams, and sixteen refrigerators to intercept heat leakage from ambient and remove radio-frequency and electron beam heat losses from the liquid helium in the accelerator dewars .
KeywordsEntropy Enthalpy Helium Assure Refrigeration
Unable to display preview. Download preview PDF.
- 1.W. B. Hermannsfeldt, G. A. Loew, and R. B. Neal, “Feasibility Study for a Two-Mile Superconducting Accelerator,” SLAC-PUB-626, Stanford Linear Accelerator Center, Stanford, California (Dec. 1969).Google Scholar
- 2.F. F. Hall, “Proposed Refrigeration Cycles for Superconducting Accelerators at 1.85°K, 1.425°K, and 1°K,” presented at 1971 IEEE National Particle Accelerator Conference, Chicago, Illinois, Mar. 1971.Google Scholar
- 3.F. F. Hall, “Proposed Solutions of Four Refrigeration Problems Relating to Superconducting Accelerators and Cryogenic Experimental Equipment,” presented at XIII International Congress of Refrigeration, Washington, D.C., Aug. 27-Sept. 3, 1971.Google Scholar
- 5.Description of Physics Program of the Proposed Recirculating Linear Accelerator,“ SLAC Rept. No. 139, Stanford Linear Accelerator Center, Stanford, California.Google Scholar
- 6.J. Chen, Rittenhouse Laboratory, University of Pennsylvania, private communication.Google Scholar
- 7.R. D. McCarty, “Provisional Thermodynamic Functions for Helium-4 for Temperatures from 2 to 1500°K with Pressures to 100 MN/m2 (1000 Atm),” NBS Rept. No. 9762 (Aug. 1, 1970 ).Google Scholar
- 8.R. M. Gibbons and D. I. Nathan, “Thermodynamic Data of Helium-3,” AFML Rept. TR-67–175, Air Products and Chemicals, Inc. (Oct. 1967).Google Scholar