Thermal performance of the Tevatron magnets under higher energy operating conditions.

The paper discusses several alternative ideas to improve the cryogenic performance of the Tevatron magnet strings under high energy, low temperature, operating conditions. A previously developed mathematical model of the Tevatron magnet string has been used to identify temperature profiles during cold compressor operation. Analysis of modeled temperature profiles shows the dominance of the spool heat leak due to a lack of heat transfer between single-phase and two-phase helium within the spool. This paper discusses a strategy for improving the temperature profile across the magnet string by installing a modified Tevatron spool with recoolers, and rearranging weak magnets. The computer simulation was carried out to identify the best location for a modified spool in the string, and preferred locations for weak magnets. Calculations indicated that, if recoolers were added to only one spool in each of the 48 strings of dipoles, the most effective location is in the middle of the string. [ABSTRACT FROM AUTHOR]