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Eurotag

Eurotag. Development of the European tagged photon facilities. Award: 600k €. Spokesperson: Ken Livingston, Glasgow. Members: Glasgow, Bonn, Giessen, INFN, Lund, Mainz, Tuebingen , Kharkov, JLab. Project Status:

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Eurotag

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  1. Eurotag Development of the European tagged photon facilities. Award: 600k€ Spokesperson: Ken Livingston, Glasgow Members: Glasgow, Bonn, Giessen, INFN, Lund, Mainz, Tuebingen, Kharkov, JLab Project Status: Manpower All EU funded posts are now filled: 7 postdocs for > 11 man years Workshop A 2 day workshop is organised for March 2006, Glasgow. Timelines On target ( averaged over 6 sub-projects ) Dissemination Web site: www.nuclear.gla.ac.uk/~kl/Eurotag …. needs updating. Internal reports, conference proceedings JRA3 Eurotag report, Dec 2005

  2. Linearly polarised photons Standard Technique: Coherent Bremsstrahlung Improvements to degree of polarisation: Better collimation from understanding 2D photon distrib. Improvements to polarimetry: Improve cbrem calculation. Build prototype polarimeter. 2D photon beam profile detector New possibility: Can Axial Quasi-channeling be used as a source of high energy polarised photonsPRELIMINARY RESULT NO! JRA3 Eurotag report, Dec 2005

  3. 1mrad Beam profiler (Glasgow) Prototype detector in MAMI beamline Profile of MAMI photon beam JRA3 Eurotag report, Dec 2005

  4. Coherent Brem. Photon Beam 1st Measurement of 2D photon enhancement for coherent bremsstrahlung. D. Glazier, Glasgow Coh. edge at 200Mev, MAMI @ 855MeV Data already in good agreement with Monte-Carlo (MCB, Tuebingen) Previously only photon energy spectrum On coh. peak Below coh. peak Now good data set with 2d photon dist. Currently being used to improve Coherent Bremsstrahlung models under Eugotag (P. Grabmayr, Tuebingen). Paper currently in preparation JRA3 Eurotag report, Dec 2005

  5. Polarimeter based on e+,e- production e+ e- Triplet production e- High analysing power ( > 50% ) Low cross-section, low energy recoil e Tested (GWU) – only 3% analysing power e+ e- Pair production Analysing power 22% Higher cross-section Tested (SC/Jlab) ~ 22% analysing power Polarimetry Coherent Bremsstrahlung Calculation (eg. Tuebingen) Used successfully, needs only photon tagger Many free parameters, > 5% systematic error How to detect the pair (or triplet) Magnetic spectrometer Microstrip detector JRA3 Eurotag report, Dec 2005

  6. Prototype Polarimeter (Bonn) Big contribution for non-EU members: KharkovMonte carlo simulations of Pair and Triplet polarimetry solutions (with Bonn) JlabRecent results and analysis of polarimeter for g8b (see below) Asymmetry from Si Microstrip detectors. Average over full Photon energy range Peak > 90% pol. PRELIMINARY K.Livingston, Glasgow J.Santoro, CUA Aim: Build a prototype polarimeter based on simulations and experience from JLab. Small, portable, in-beam, fast (ie better than 5% in order of minutes) JRA3 Eurotag report, Dec 2005

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