Vienna Conference on Instrumentation

Recent results with HV-CMOS and planar sensors for the CLIC vertex detector

• Speaker: Niloufar Alipour Tehrani (CERN)
• Status: accepted for oral presentation, Id: 226
• Abstract: The physics aims at a future multi-TeV CLIC linear e+e- collider impose high precision requirements on the vertex detector. The detector also has to match the experimental conditions, such as the time structure of the collisions and the presence of beam-induced backgrounds. The principal challenges are: a point resolution of 3 micron, 10 ns time stamping capabilities, ultra-low mass (0.2% X0 per layer), very low power dissipation (compatible with air-flow cooling) and pulsed power operation. The R&D for the pixel detector follows an integrated approach addressing simultaneously the physics requirements and the engineering constraints. Two types of hybrid pixel detectors with ultra-small pitch (25*25 micron) and analogue readout are explored. Both make use of a dedicated readout ASIC (CLICpix), developed in 65 nm technology. CLICpix is either bump bonded to ultra-thin planar silicon sensors (with and without active edges), or AC coupled through a thin layer of glue to active HV-CMOS sensors. Results of recent beam tests and laboratory calibrations of a variety of assemblies with different sensor thicknesses are presented. Detailed simulations based on Geant4 and TCAD validate the experimental results and serve to optimise the detector design. The R&D project also includes the development of through-silicon via (TSV) technology, as well as various engineering studies involving thin mechanical structures and full-scale air-cooling tests.
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[CALICE abstract:] Shower characteristics of particles with momenta up to 150 GeV in the CALICE scintillator-tungsten HCAL

• Speaker: Eva Sicking (CERN)
• Status: accepted for oral presentation, Id: 246
• Abstract: In the R&D effort towards detectors at future high-energy colliders, CALICE is studying novel options for more compact hadron calorimeters. Using tungsten as dense absorber material appears to be an attractive alternative to iron. In this talk, a study of showers initiated by electrons, pions, kaons, and protons with beam momenta up to 150 GeV in the CALICE scintillator-tungsten HCAL is presented. Details of the data reconstruction and simulation as well as of the studies of systematic uncertainties are discussed. The resulting measurements of the calorimeter response to each particle type, as well as the energy resolution and detailed studies of the longitudinal and radial shower development, are presented. These results, of unprecedented detail, serve to validate and tune Geant4 simulation models for tungsten-based calorimetry. The data are therefore compared with several Geant4 simulation models.
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Development of a silicon tracker for CLIC

• Speaker: Andreas Nurnberg (CERN)
• Status: merged with HV-CMOS talk
• Abstract: The physics aims and experimental conditions at a future multi-TeV CLIC linear e+e- collider set high demands on the tracker system, comprising a highly granular vertex detector and a large silicon-based tracker. The tracker of 3 m diameter and 4.6 m length will be operate in a 4 T solenoid field. Its principal requirements include 7 micron point resolution and 10 ns time stamping. Individual tracking layers have to be thin: 1% X0 including sensors, readout, supports, services and cooling. Power pulsing at 50 Hz is foreseen. The presence of beam-induced backgrounds locally leads to high particle rates and limits maximum cell sizes. The optimisation study follows a fully integrated approach, taking technology considerations, tracker performance and engineering aspects into account. To this aim detailed simulation studies with Geant4, TCAD and a parametric readout simulation have assessed performance parameters, such as charge sharing, resolution and efficiency, as a function of the sensor material, sensor thickness, noise parameters, incident particle angles and B-field. The simulations match experimental data and allow to compare design options, e.g analog or binary readout. To optimise the detector layout, physics observables and track reconstruction aspects are combined with engineering considerations, such as low-mass structural design (FEA-based), services routing and cooling. For the emerging hardware R&D both hybrid concepts and fully integrated sensors are considered.
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