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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: Instrumentation I

AKBP 10.3: Talk

Wednesday, March 22, 2023, 18:00–18:15, CHE/0183

Teaching an old magnet new tricks — •Tasha Spohr — Helmholtz-Zentrum Berlin — Humboldt-Universität zu Berlin

For beam dynamics studies in the SeaLab SRF photoinjector, a dipole spectrometer built in 1993 and recycled from a decommissioned ion beamline was installed.

With this spectrometer, the beam energy and energy spread can be measured. The photoelectron beam will be bend by 60deg to a viewscreen in the dispersive section. For a precision energy analysis based on the beam size measurement at the viewscreen, it is necessary to know the beam transfer matrix of the dipole, as well as the relationship between magnetic field and coil current in the plane of all possible trajectories.

With this information about the dipole magnet, the transformation matrix of the beamline was determined and now can be applied for a large range of energy measurements.