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Publication
Design and test of RF shielding for beam impedance reduction in CERN accelerators
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Advisor(s)
Abstract(s)
CERN, the European Organization for Nuclear Research, is one of the world’s
largest laboratories for high-energy particle physics. At CERN, particle accelerators
and detectors are used to study the basic constituents of matter. CERN’s flagship
accelerator is the Large Hadron Collider (LHC), the most powerful particle accelerator
built up to now. However, it would not work without its accelerator injector
chain. This chain starts with LINAC4, followed by PSB, PS, and SPS, which inject
into the LHC.
Relatively new particle accelerators like the LHC were designed from scratch
with a limited overall beam coupling impedance budget in mind, but this was not
the case for the older accelerators at CERN, designed and built decades ago and
originally intended for much lower beam intensities. Currently, one of the limiting
factors to increase the beam intensities is instabilities caused by the beam coupling
impedance of the older accelerators in the chain, such as the PS.
The PS vacuum manifolds were identified as one source of instabilities due to a
high beam coupling impedance. The current impedance contribution of the manifolds
was simulated and measured. Several possible shielding solutions, aimed at reducing
the beam coupling impedance, were studied and simulated, giving promising results.
Routine RF measurements of other components of the accelerator were performed,
either to complete the accelerator impedance contribution database or to assess
whether or not the installed shielding is effective. During one of these measurements,
it was found that a spare PS septa magnet had defective RF fingers, and the
shielding was not effective.
Description
Keywords
Simulação eletromagnética Aceleradores de partículas Beam coupling Impedance Medições RF