Speaker
Description
During the Long Shutdown 2 (LS2) at CERN, the new Linac4 (L4) accelerator has been
successfully connected to the PS Booster (PSB) to inject 160 MeV H− beam into the 4
superposed PSB rings. The horizontal displacement of the circulating beam during injection
relies on 4 pulsed dipole magnets. During the initial run of the new magnet system, non-
conformities have been observed. These could be traced back mainly to early fatigue effects,
some of which were in brazed joints on the coil cooling circuit. An extensive program has been
launched to improve the brazing technology for the spare coil manufacturing. This effort has
been combined with numerical computations as well as destructive and non-destructive
testing of brazed joints, allowing to identify critical stress domains resulting in fatigue sensitive
areas. This paper describes the applied methodology and implements measures to increase
the robustness of the magnet coils. The achieved improvements have been validated by
testing based on an instrumented coil, allowing to correlate stress-strain measurements with
results from the structural and transient numerical computation.
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