Quench analysis of the energy deposition in the SSC magnets and radiation shielding of the low- beta IR quadrupoles

The temperature rise in a superconducting coil due to energy deposition is estimated, as is the quench threshold for periodic, continuous, and accidental particle losses in the ring. Radiation shielding in the interaction regions is analyzed along with its implications for the beam luminosity for the Superconducting Super Collider (SSC). Results show that there are no quench problems because of the direct energy deposition in the coil due to beam gas scattering or pp collision at the interaction points. Other results suggest that the threshold quench limit for fast spill is 0.2 mJ/g, which is much lower than that for the Tevatron magnets; hence, calculations based on the doubler threshold limits might result in underestimation. In addition, the lifetime of the quadrupoles close to the interaction point in the low- beta IR was estimated with and without shielding. This lifetime could be much lower if weaker materials against radiation damage are needed in these magnets, and if, because of many uncertain factors, the IR quadrupole magnets have to be protected. Calculations suggest that the maximum reduction in energy deposition in low- beta superconducting magnets is one order of magnitude using an 8-mm-diameter, 4-m-long iron collimator.<>