LONGITUDINAL COUPLED-BUNCH INSTABILITY STUDIES IN THE PS
DOI:
https://doi.org/10.23727/CERN-Proceedings-2017-002.59Abstract
The main longitudinal limitation for LHC-type beams in the PS are coupled-bunch instabilities. A dedicated prototype feedback system using a Finemet cavity as a longitudinal kicker has been installed. Extensive tests with beam have been performed to explore the intensity reach with this feedback. The maximum intensity with nominal longitudinal emittance at PS extraction has been measured, as well as the emittance required to keep the beam longitudinally stable at the design intensity for the High-Luminosity LHC (HL-LHC). A higher-harmonic cavity is a complementary option to extend the intensity reach beyond the capabilities of the coupled-bunch feedback. Preliminary machine development (MD) studies operating one 20MHz or one 40MHz RF system as a higher harmonic at the flat-top indicate the beneficial effect on longitudinal beam stability.
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2017-12-12
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