10–15 Aug 2025
SAFE Credit Union Convention Center
America/Los_Angeles timezone

Beam-based measurement of LCLS-II injector solenoid misalignments

TUP012
12 Aug 2025, 16:00
2h
SAFE Credit Union Convention Center

SAFE Credit Union Convention Center

1401 K St, Sacramento, CA 95814
Poster Presentation MC5 – Beam Dynamics and EM Fields TUP: Tuesday Poster Session

Speaker

Ahmed Osman (SLAC National Accelerator Laboratory)

Description

Solenoid focusing is commonly used in accelerators for electron beam containment and to compensate for space charge-induced emittance growth at low beam energies. However, misalignment between the solenoid field and the beam trajectory can result in degraded emittance compensation due to dispersive effects and geometric aberrations in the magnetic solenoid. This paper presents a technique for beam-based measurement of solenoid misalignments, using expressions derived from a hard-edged solenoid linear transfer matrix with known beam parameters. The analysis includes the necessary scaling factors to accurately model the induced Larmor rotation and focusing effects of a thin physical solenoid. Results from measurements conducted at the LCLS-II injector are presented as a validation of this method, along with simulation studies estimating the impact of solenoid misalignments on emittance growth in the LCLS-II injector.

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Author

Ahmed Osman (SLAC National Accelerator Laboratory)

Co-author

Feng Zhou (SLAC National Accelerator Laboratory)

Presentation materials

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