Simultaneous beam-based alignment measurement for multiple magnets by correcting induced orbit shift

Journal Article · Mon May 16 00:00:00 EDT 2022 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.052802· OSTI ID:1867916

Huang, Xiaobiao

We propose a method to simultaneously determine the magnetic centers of multiple quadrupoles in a transport line or a storage ring. The method finds the magnet centers by correcting the induced orbit shift due to a change of the quadrupole gradient strengths, with the goal of eliminating or minimizing such orbit shifts. The correction of the induced orbit shift is done by steering the orbit toward the quadrupole centers with correctors, using the response matrix of the induced orbit shift with respect to the correctors. The quadrupoles are selected with orbit corrector magnets and beam position monitors in between to ensure that orbit correction at the quadrupole locations can be achieved. The response matrix can be measured or calculated. Simulations with a section of the Linac Coherent Light Source II and the Stanford Positron Electron Asymmetric Ring (SPEAR3) storage ring are done to demonstrate the feasibility and performance of the method. It is also experimentally tested on SPEAR3. The method can be extended for beam-based alignment measurement of nonlinear magnets.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1867916
• Alternate ID(s): OSTI ID: 1877342
• Journal Information: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 25 Journal Issue: 5; ISSN 2469-9888
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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