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@inproceedings{johnson:ipac2021-thpab158,
author = {D.E. Johnson and D.G. Georgobiani and V.V. Kapin and J.-F. Ostiguy and V.I. Sidorov and M. Xiao},
title = {{BEAM COLLIMATION IN THE PIP-II LINAC TO BOOSTER TRANSFER LINE}},
booktitle = {Proc. IPAC'21},
pages = {4068--4071},
eid = {THPAB158},
language = {english},
keywords = {injection, booster, collimation, linac, proton},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-THPAB158},
url = {https://jacow.org/ipac2021/papers/thpab158.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-THPAB158},
abstract = {{The new PIP-II superconducting linac will deliver a 2 mA average H⁻ beam to the existing Booster synchrotron. The injected beam is accumulated by charge exchange over approximately 300 turns; phase space painting is used to mitigate space charge effects. To limit the power load on the internal waste beam absorber from the transverse tails of the H⁻ distribution missing the foil, the beam will be collimated in both planes in the linac to Booster transfer line using compact collimators of a novel design. Both the number of parasitic hits and the fraction of the beam missing the foil are sensitive functions of the H⁻ beam centroid position with respect to the edge of the foil. The positioning of the collimation is constrained by the availability of suitable space in the transfer line lattice, by specifics of the collimator design, by the phase space orientation at the collimator, and by the betatron phase advance to the foil needed to achieve proper orientation of the spatial distribution at the injection point. In this contribution, we describe the procedure by which collimator positions were optimized. We then discuss the expected performance of the overall system.}},
}