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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster - Hadronenstruktur und -spektroskopie

HK 54.13: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 3.OG

PANDA EMC backward end-cap mechanics — Luigi Capozza, Jorge Ceballos, Dexu Lin, Frank Maas, •David Rodriguez, Roserio Valente, and Felix Welzel — Helmholtz-Institut Mainz

The PANDA experiment at the FAIR facility will be a multipurpose hermetic spectrometer covering the full solid angle range. A key role for several physics cases will be played by the electromagnetic calorimeter. This includes ca. 15000 PbWO4 scintillating crystals arranged in a central barrel, a forward and a backward end-cap.

The backward end-cap of the PANDA electromagnetic calorimeter is composed by 540 straight crystals covering the scattering angles between 147* and 161*. They are housed in the so-called alveoli which are carbon fibre boxes, providing both strength and low material budget.

The crystals are to work at -25*C in order to improve the light yield. To achieve this temperature a cooling system and thermal insulation are needed. The cooling system removes the heat coming from the electronics and through walls, cables and mechanical supports. Vacuum insulated panels are installed as a thermal shielding.

Avalanche Photodiodes (APD) have been chosen as photon detectors, since they are still functional under strong magnetic fields. ASIC chips will be used to amplify the APD signal, this preamplifier features low noise and low heat generation.

Due to the weight of this detector, it will be supported from the outside of the PANDA target spectrometer in a counter lever arm position.