Speaker
Description
In preparation for commissioning of Linac2 (PIP-II) at Fermilab, software tools automating Orbit Response Matrix measurement and beam-based localization of quadrupole magnetic centers are being developed. The intention is to realize the procedures in a low-loss mode compatible with otherwise regular operation. The ORM is measured using simultaneous low-amplitude excitation of multiple dipole correctors at distinct frequencies, followed by Discrete Fourier Transform analysis of the recorded BPM signals to extract per-element transfer functions with quantified noise. One of the applications of the measured ORM is prediction of coefficients for creating local perturbations with the dipole correctors (bumps). For centering the trajectory in a quadrupole, such a bump is created around the quadrupole. The current of the quadrupole is oscillated, and responses of downstream BPMs are recorded and analyzed. The procedure is repeated at several beam positions inside the quadrupole, changed by the bump. The dependence of the BPM signal on this beam position provides information about the quadrupole center. The tools are tested at the Fermilab 400 MeV Linac during regular productions runs.
Funding Agency
This work was produced by FermiForward Discovery Group, LLC under Contract No. 89243024CSC000002 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
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