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D. Rodríguez Piñeiro, D. Khaneft, M. C. Mora Espí, Y. Ma, F. Maas, M. Zambrana, I. Zimmermann

PANDA Experiment. GEM Detectors. Shashlyk Calorimeter. Muon Range System. Mini Drift Chambers. Central Tracker. Target System. Micro Vertex Detector. Solenoid. Barrel TOF. TOF Wall. Dipole. Beampipe. RICH. Muon Detection. Disc DIRC. EM Calorimeter. Barrel DIRC. Main support.

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D. Rodríguez Piñeiro, D. Khaneft, M. C. Mora Espí, Y. Ma, F. Maas, M. Zambrana, I. Zimmermann

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  1. PANDA Experiment GEM Detectors Shashlyk Calorimeter Muon Range System Mini Drift Chambers Central Tracker Target System Micro Vertex Detector Solenoid Barrel TOF TOF Wall Dipole Beampipe RICH Muon Detection Disc DIRC EM Calorimeter Barrel DIRC Main support Counterweight Alignment system Due to the high weight the detector will be held from the outside, using a counterweight and placing the alignment system. Accurate rails will be used for insertion into the magnet. Backward end cap electromagnetic calorimeter PANDA at FAIR facility D. Rodríguez Piñeiro, D. Khaneft, M. C. Mora Espí, Y. Ma, F. Maas, M. Zambrana, I. Zimmermann Design Parameters of PANDA EMC Scintillation material: PbWO4 Dimension: 25×25×200mm3 (Varies) Number of crystals: ca. 15,000 Angular coverage: 99% of 4 π Operation temperature: -25 oC Energy threshold: 10 MeV Expected radiation dose: 10 Gy/125 Gy forward Energy resolution: Thermal Studies 2 mm Carbon fibre Low thermal expansion 2 mm Aluminium Good thermal conductivity -25ºC 20ºC Rohacell spacers Good strength Mechanical Support Super insulation foils Radiation stop High Vacuum Conduction stop BW end cap inside the PANDA experiment The BW end cap of the PANDA EMC comprises 540 crystals (24.4x24.4x200 mm3) covering theta angles between 147º and 161º from target position. In order to see the influence of the ambient temperature, the heating caused by the preamplifiers and other heating sources first thermal simulations have been started. Here a Unit of 4 crystals is shown. It also includes the capsules for the APD´s and one insert. A heat flux through the vacuum panels is assumed and also the heating caused by the preamplifiers is included. Because of the additional cooling, a fixed temperature of -25°C is assumed in the back. More sophisticated simulation is under going. Subunit L-Frames fixing the position of the capsule with the APD. Aluminium inserts glued to the alveoles and screwed to a mounting plate Crystals are hosted in carbon fibre alveoles due to its good strength and low material budget. ASIC chip will be used as the electronics after APD, which is still under development. The picture above is the preamplifier designed for prototype EMC. The preamplifier features a low noise and low heat generation. Avalanche Photodiode (APD) has been chosen as the photon detector for EMC, which still is functional under strong magnetic field. The APD used in PANDA EMC features a large area to maximize the coverage of the PWO end face. Acknowledgement: P. Rosier Contact Persons: D. Rodríguez Piñeiro, Dr. Y. Ma, I. Zimmermann PbWO4 Crystals

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