Beam Cal W Lohmann DESY Beam Cal ensures
Beam. Cal W. Lohmann, DESY Beam. Cal: ensures hermeticity of the detector to smallest polar angles -important for searches Serves as a feedback system for Lumioptimisation and beam diagnostics (see Bill’s talk) -supports maximum Luminosity Septembre 16 2007 SLAC
Current design (Example LDC, 14 mrad): Lumi. Cal QD 0 (Luminometer) TPC HCAL EC AL Beam. Cal -compact, approach smallest possible Moliere radius, e. g. Si/W sampling calorimeters -centered around the outgoing beampipe (detector phi symmetry broken) -readout after each BX (more space for electronics, power dissipation) Septembre 16 2007 SLAC
Simulations to optimise the Design E. g. from UC Boulder Beamstrahlung Te. V per BX Head-on view electron from 2γ process Efficient detection of high energy electrons is essential for search experiments Septembre 16 2007 SLAC Side view
Forward Region in the LDC Detector Septembre 16 2007 SLAC
Forward Region Beam. Cal Space for cables QD 0 Lumi. Cal Vacuum Pump Septembre 16 2007 Graphite SLAC Space for electronics/connectors cooling Shielding Tube
Beam. Cal Details Prototyping of 12 channel Integrated FE (amplifier and ADC) Septembre 16 2007 SLAC Made by S. Schuwalow
Tungsten Layers and Sensors Septembre 16 2007 SLAC
Front/Back Support Frames Septembre 16 2007 SLAC
Total mass: ~200 kg Septembre 16 2007 SLAC
Beam. Cal positioning inside the Shielding Tube Septembre 16 2007 SLAC
The Mounting Procedure for Beam. Cal Installation and disassembly must be possible without opening the vacuum! 1 montage of an auxiliary structure 2 montage of the first half barrel 3 Turn the barrel and bring the first calorimeter half barrel in final position 4 remove the auxiliary structure 5 montage of the second half barrel To perform this procedure the upper half of the shielding tube has to be removed Septembre 16 2007 SLAC
Summary Beam. Cal (example LDC) - Length in z: 15 cm bare calorimeter ~10 cm graphite in front (reduction of backscattered electrons). ~10 cm space at the rare side (electronics, connectors) - Inner and outer instrumented radius: 20 – 165 mm - Full outer Radius: 200 mm - Outer radius including support: 220 mm - Total weight: ~200 kg - Upper part of the shielding tube must be removable - Crane operation necessary for montage/demontage -Details of FE ASICs not yet fixed, but there will be connectors, power and signal cables……. Septembre 16 2007 SLAC
- Slides: 12