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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 3: Diagnostics

AKBP 3.5: Vortrag

Montag, 9. März 2026, 16:00–16:15, SCH/A117

Compton Polarimetry with a Timepix3 ASIC at ELSA — •Tobias Schiffer, Michael Switka, Dennis Proft, and Klaus Desch — Physikalisches Institut der Universität Bonn, Bonn, Germany

The Electron Stretcher Facility (ELSA) in Bonn can provide spin polarized electrons to its users. During acceleration depolarising resonances have to be crossed reducing the achievable degree of polarization.

For a non-destructive in situ measurement of the beam polarization in the storage ring a Compton polarimeter is available. It utilizes a high intensity cw-laser beam scattering off the electron beam. The back scattered photon profile is measured with a detector. Depending on the polarization of the laser and the electron beam a vertical shift of the intensity profile can be observed. This is currently measured with a in-house custom-built silicon strip sensor.

However, to improve the detector setup and to obtain 2D information, a detector using a pixelized readout chip (Timepix3) with a 500 µm thick silicon sensor is in development.

The current status of the detector and first results of the performance are presented.

Keywords: ELSA; Timepix3; Accelerator; Compton; Polarimetry