NA61 Projectile Spectator Detector (PSD). Upgrade. Status. Performance. Morozov Sergey Institute for Nuclear Research RAS, Moscow on behalf of NA61/Shine
NA61 PSD. Motivation. Projectile Spectator Detector (PSD) gives a very important informations: - centrality of nucleus-nucleus collisions Number of interacting participants: - reaction plane orientation N p = A − E s PSD is a hadron sampling E a compensating calorimeter A – mass number of ion • Pb/scintillator (4/1) 60 E a – beam energy per nucleon sandwiches in one module E s – energy carried by the non-interacting • Modules 10 x 10 x 120 cm 3 – nucleons (projectile spectators) - central part - measured by PSD! • Modules 20 x 20 x 120 cm 3 - outer part • 10 longitudinal sections with 10 MAPDs readout MAPD PSD layout Front face of PSD on a moving platform one PSD section view 44 modules, 440 MAPD channels, 17 tons.. 2
NA61 PSD. Assembling and upgrade. FEE + temperature controller PSD ready for upgrade full module assembled (+DAQ MB) PSD fully equipped 3
NA61 PSD. Design. Upgrade. Schematic view of slow control and temperature control readout system for NA61 PSD HVSys, Dubna flat cable HV . . . HVSys HVSys HVSys HVSys control box TEC TEC TEC TEC LAN RS485 network (twisted pair) TEC-1091 USB ambient temperature USB to RS485 Converter PSD readout PC USB to RS485 Converter PSD module temperature 4
NA61 PSD. Calibration. NA61 PSD was calibrated during 27 October – 3 November on SPS beam: - muon + hadron beam centred on each of 44 modules for precise muon calibration and hadron energy reconstruction tests perfect MIP-like signal visible! ADC this is “1 MIP” - beam momentum scan (13, 20, 31, 40, 60, 80, 120 and 158 GeV/c) for fine tuning of PSD response and check linearity and hadronic energy resolution - 44 module scan with reduced HV on MAPD to increase the dynamic range of MAPD for using PSD at high nucleus-nucleus collisions 5
NA61 PSD. Calibration. Performance 20GeV 31GeV 40GeV Results of PSD calibration: 60GeV - good linearity of response observed 80GeV 120GeV 158GeV - hadron energy resolution was estimated Thanks for the nice test beam for PSD! 6
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