Details

Autor(en) / Beteiligte

• Wendel, Christoph
• Collaboration, the CBELSA/TAPS

Titel

The Crystal-Barrel/TAPS experiment at ELSA Current status of the CsI(Tl) calorimeters

Ist Teil von

• Journal of physics. Conference series, 2009-04, Vol.160 (1), p.012006, Article 012006

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2009

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• The Crystal Barrel experiment at ELSA, as a medium-energy hadron physics experiment, is focused on baryon-spectroscopy and meson-photoproduction. The experimental setup includes three different, ψ-symmetric calorimeters covering almost the complete solid angle. The detector system, together with a polarised target and a linearly or circularly polarised photon beam, allows in addition to the measurement of cross sections also the measurement of single- and double-polarisation observables. Baryon resonances up to masses of 2.5 GeV can be investigated. In the course of a major upgrade of the CsI(Tl) calorimeters, two different techniques to detect the light generated in the crystals are compared with the known performance of the existing photodiode readout. The aim of the new techniques is to enable the calorimeter to be a first level trigger source while keeping a very good energy resolution comparable to the present pho-todiode readout. The first solution is a complete redesign of the crystal readout, featuring two 10mm x 10mm APDs mounted directly on the crystals. With an integrated, fast preamplifier, this readout will allow both an energy measurement and the generation of a fast timing-/trigger-signal. The second solution is a modification of the existing setup. The photodiode will continue to provide the energy information while two additional SiPMs will create the timing-/trigger-signal.