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2nd International Conference on Micro Pattern Gaseous Detectors, Kobe : Japon (2011)
Micromegas at low pressure for beam tracking
J. Pancin1, B. Fernandez, S. Damoy1, M. Kebbiri2, T. Papaevangelou2, M. Riallot2

New facilities like FAIR at GSI or SPIRAL2 at GANIL, will provide radioactive ion beams at low energies (less than 10MeV/n). Such beams have generally a large emittance, which requires the use of beam tracking detectors to reconstruct the exact trajectories of the nuclei. To avoid the angular and energy straggling that classical beam tracking detectors would generate in the beam due to their thickness, we propose the use of SED (Secondary Electron Detectors). It consists of a low pressure gaseous detector placed outside the beam coupled to an emissive foil in the beam. Since 2008, different low pressure gaseous detectors (wire chambers and micromegas) have been constructed and tested. The performances achievable at low pressure are similar to or even better than the ones at atmospheric pressure. The fast charge collection leads to excellent timing properties as well as high counting rate capabilities. Several micromegas at low pressure were tested in the laboratory demonstrating a good time resolution, 130±30 ps, which is compatible with the results obtained with wire chambers.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
Technique de la Physique
Physique/Physique/Instrumentations et Détecteurs
Micropattern gaseous detectors (MSGC – GEM – THGEM – RETHGEM – MHSP – MICROPIC – MICROMEGAS – InGrid – etc) – Particle tracking detectors (Gaseous detectors)