Temperature considerations in the design of a permanent magnet storage ring

To improve the luminosity of the Fermilab Tevatron proton-antiproton collider in the post Main-Injector era, the most straightforward approach is to increase the intensity of the antiproton beam. A number of schemes based on fixed energy storage rings have been suggested to accomplish this goal. A fixed energy ring can be used to accumulate freshly produced antiprotons and/or to recycle used antiprotons at the end a store. For reasons of cost and reliability, permanent magnets are strong contenders for the magnet assemblies, with ceramic ferrite the material of choice. Since ferrite magnetization has a relatively large temperature coefficient, temperature considerations are very important. In this paper, we investigate the expected temperature environment for a fixed energy ring at Fermilab, the required temperature stability and possible methods of compensating temperature dependent effects