SUPERFLUID PERFORMANCE OF TEVATRON IR QUAD HEATERS

A collaborative team from the two laboratories measured the performanc e of Tevatron interaction region (IR) quadrupole at temperatures from 1.8 K to 4.4 K. These studies included measurement of their performanc e as function of temperature as well as measurement of the effectivene ss of the protection heaters, diffusion times were measured for variou s temperatures, current levels, and power densities. These results and their implications on the design of magnet protection systems and mag net design operating in this temperature range will be discussed.