Ingo DeppnerRPC 2012 Workshop, INFN, Feb Conceptional Design Timing RPC with: active area: A = 120 m 2 counter time resolution: T ~ 50 ps rate capability: R ~ 0.5 – 25 kHz/cm 2 granularity: A ~ 6 – 50 cm 2 operation mode: free running (see talk of P.-A. Loizeau on Friday) Rate profile (Au-Au(minimum bias) at E=25 GeV/A) kHz/cm 2 A. Kiseleva, P.-A. Loizeau 44 SM (55%) have a rate < 1 kHz/cm 2
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Summary At the Physikalisches Institute of the Heidelberg University we developed a MMRPC prototype for the low rate region (below 1 kHz/m2) for CBMThis prototype was successfully tested with pions and protons at SIS18 at GSI / Darmstadt and at the COSY accelerator in Jülich Based on these in-beam tests we can show that an efficiency above 95% was reached for preamplifier thresholds below 30 mV Results obtained from the electronics mounted directly on the RPC indicate a higher stability in terms of noise and signal reflections Warming up the RPC environment by 15 °C seems to be enough in order to fulfill the CBM - TOF requirement of he outer region The mean cluster size for this prototype is in the order of 1.3 and growing with temperature Time resolution is in the order of 50 ps
Next stepsFull size demonstratorRPC fully differentialactive area 52 x 54 cm2
PCB size 56 x 60 cm2 (maximal size)strips 52strip / gap 7 / 3 mmglass type float glassglass thickness 0.5 mm number of gaps 8 - 9gap width 220 mPADI board with 4 channel input(under developmet)
transmission line with 2 x 50 imp-edance to ground
connector to a 4 ch.
PADI5 cm 200 k SMD
resistor to ground
5 cm
Super module# RPCs: 6 # strips: 312# PADI (4 ch.) : 156# channels: 624total active area: 152 cm x 104 cmoverlap h: 4 cm v: 2 cmbox size (inside)170 cm x 130 cm x 14 cm
CBM Physics topics Deconfinement / phase transition at high ρB
QCD critical endpoint The equation-of-state at high ρB
chiral symmetry restoration at high ρB
Observables excitation function and flow of strangeness and charm collective flow of hadrons particle production at threshold energies excitation function of event-by-event fluctuations excitation function of low-mass lepton pairs in-medium modifications of hadrons (ρ,ω,φ → e+e-(µ+µ-), D)
In order to measure all these observables with an high accuracy, we need a good
particle identification
Backup
non twisted part
connector
pK
D. Kresan Au + Au @ 25GeV
Kaon acceptance depends critically on TOF resolution