MECHANICAL ANALYSIS OF A HIGH-GRADIENT QUADRUPOLE FOR THE LHC

The magnetic design of the LHC interaction region quadrupole by the BN L, FNAL, LBNL collaboration eliminates the manufacturing complication of a graded cable splice in the outer coil and still attains a maximum gradient above 235 T/m. The mechanical design includes strong preload ed collars, shims to adjust the fit between components when warm, cont act between the collar and iron when cold for better coil support, and a closed iron to reduce harmonics. This paper summarizes mechanical f inite element results for assembly, cooldown to 1.8 K, and excitation to maximum gradient.