Speaker
Description
The PIP-II project will retire Fermilab existing 400 MeV warm linac to replace it with a new superconducting 800 MeV linac. The total charge injected in the downstream Booster rapid cycling synchrotron
will increase by 50\% from $4.5\times 10^{12}$ to $6.5\times 10^{12}$ while the machine ramp rate will go from 15 to 20 Hz, ultimately achieving a doubling of the average beam power. The Booster accelerates particles from 800 MeV to 8 GeV and crosses transition at 5.1 GeV ($\gamma=5.45$) which is expected to be a source of intensity dependent emittance blowup.
To prevent excessive losses in the downstream machine in the acceleration chain, it is necessary to keep the longitudinal emittance at extraction below 0.1 eV-s (95\%); furthermore, to prevent losses when the beam is transferred to the downstream machine, rf manipulations (colloquially referred to as bunch "rotation") are required immediately prior to extraction to achieve a longitudinal phase space match. We describe a possible bunch rotation scheme based on briefly positioning the bunch on an unstable fixed point in phase space to quickly achieve the optimal match. Results of 2D and 6D simulations using the codes ESME and PyORBIT respectively are presented.
Funding Agency
Work performed for Fermi National Accelerator Laboratory (Fermilab)
operated by Fermi Forward Discovery Group, LLC for the
U.S. Department of Energy under contract 89243024CSC000002
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