Abstract
The CERN large hadron collider (LHC) Injectors Upgrade seeks to reliably deliver the beams required for the High-Luminosity LHC (HL-LHC). As part of this, the proton synchrotron booster (PSB) will be upgraded from 1.4 to 2 GeV and will accelerate higher intensity beams. Along the transfer lines between the PSB and the proton synchrotron there are several dc-operated quadrupole magnets that are unable to produce the gradients required for the 2 GeV HL-LHC beams. To minimize power consumption, these will be replaced by laminated quadrupole magnets, operated in pulse to pulse modulation mode. The field homogeneity requirements imposed on these magnets is very tight, requiring a homogeneity of $5\times 10^{-4}$ on the integrated gradient. Such strict requirements presented several issues for the design, especially when considering the space constraints that naturally apply when upgrading a pre-existing accelerator. The design of these quadrupole magnets is summarized here.
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