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Proceedings Particle Accelerator Conference
The present Fermilab IR quadrupole lenses achieve a 50% increase in gradient over their predecessors. This was accomplished by the following developments: a) a more dense winding (Kapton insulation only, eliminating the fiberglassepoxy), b) an improvement in critical current density to J c (5T, 4.2K) = 3 kA/mm 2 and c) a higher aspect ratio cable >11/1 and d) finer strand (0.53 mm diameter). The natural evolution of this design to the CERN 70 mm aperture quadrupole results in the following : a)doi:10.1109/pac.1995.505236 fatcat:wzgs5hgwtbe47gf3gp2xvbslbi