Speaker
Description
The Electron Stretcher Facility (ELSA) in Bonn has the capability to accelerate spin-polarized electrons. To know the degree of polarization an in situ measurement is necessary. A Compton backscattering polarimeter located in the stretcher ring allows for in situ measurements of the beam polarization degree. Here a high power cw-laser beam is scattering with the electron beam. The backscattered photons reach energies of up to several 100 MeV and polarisation dependent shift in the vertical profile can be observed from these photons. Currently an in-house custom-built silicon strip sensor is used.
To obtain a better understanding of the measured profile, 2D information is crucial. Here the Timepix3 ASIC (55 µm pixel pitch) with a 500 µm thick silicon sensor is a suitable candidate, allowing for 2D information with an excellent time resolution (25 ns), enabling for parallel time resolved horizontal and vertical profile measurements. Using an in-house developed readout allows for high flexibility and adaptability. The detector concept as well as first measurements under various conditions of the vertical and horizontal profiles from polarized beams are presented.
| Paper status | Proceeding files received |
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