10-12 April 2019
Denver, CO
US/Mountain timezone
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Contribution contributed talk

Denver, CO - Director's Row H

Recent developements at the A2 real photon facility at MAMI


  • Dr. Andreas THOMAS

Primary authors


The A2 Collaboration at the Mainz Microtron MAMI measures photon absorption cross sections using circularly and linearly polarized 'Bremsstrahlung' photons up to an energy of ~1.5GeV. We use a 4 π detection system with the 'Crystal Ball' as central part.

We have developed a Frozen Spin Target in close collaboration with the polarized target group of the Joint Institute for Nuclear Research (JINR, DLNP) in Dubna, Russia. The 3/4Helium dilution refrigerator provides temperatures down to 25 mKelvin. Both longitudinally and transversely polarized protons and deuterons are possible with the help of superconducting holding coils.

In this talk recent developements at A2, especially the first use of a newly developed active polarized solid target in the year 2016 will be described and new possibilities for the application of this technology in high energy physics experiments will be adressed.

In addition, results from recent measurements related to meson photoproduction will be presented.