SSC dipole quench protection heater test results

Results of tests of a redesigned quench protection heater for SSC (Superconducting Super Collider) dipole magnets are presented. It is shown that the redesigned heater has a performance similar to that of the existing heater in terms of its ability to protect a long 40-mm magnet. It meets the system requirements of increased resistance by using a smaller cross sectional area and a larger active length. This results in a larger area of heater, which has advantages but does not result in higher powers being required from the heater firing unit. The implication of increased cost is mitigated somewhat since lower-gauge connection cable is made possible. The magnet program for the 50-mm dipole is characterized by a higher operating margin and slower quench propagation velocities.<>