Heavy-ion collisions p-p data taking
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01.08.2018
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heavy-ion
collisions
p-p data taking
highly-saturated avalanche operation
preliminary
studies with cosmic rays
test on 50x50 cm2 RPC
(Clermont-Ferrand laboratory)
FEE thresholds set at 10 mV
efficiency
the shape of each signal is sampled each ns to study amplitude, timing and released charge:
streamer comtamination
beam test setup (CERN: GIF + SPS-X5)
beam test: results (I)
4 efficiency calculation methods:
Coincidence
Register
tracking with DWC
total
core (higher beam irradiation rate)
outer circle (lower beam irradiation rate)
T/p correction:
HVeff=HV0*(T/T0)*(p0/p)
with T0=293.15 K, p0=970 mbar
beam test: results (II)
beam test: gas analysis
during the test analysis of the exhaust gas were performed both for streamer and maxi-avalanche
operation of the RPC
ageing test setup (CERN GIF)
small prototype 1: ageing results
gas mixture modification
we decrease the SF6 percentage
to lower the working point
beam test on 2 small prototypes (50x50 cm2) to check the performances with the gas mixture:
89.7% C2H2F4, 10% C4H10 + 0.3% SF6 – RH=50%
to make a direct comparison with the gas mixture with 2% SF6:
performances:
cluster size: 1.8 (1 cm strip)
time resolution: 1-2 ns
efficiency: in all position the efficiency plateau reaches 95-96%
no significant differences with respect to the gas mixture with 2% SF6
working HV~10000-10100 V (800 V lower)
streamer contamination <20%
small prototype 2: results
small prototype 3: results
efficiency plateaux
conclusions
Muon
Trigger System
outline
beam test (X5-SPS) on a pre-production RPC:
RPC1, 70x270 cm2
efficiency¤t, cluster size and gas analysis
ageing test (GIF):
RPC 50x50 cm2 (small prototype 1)
beam test (X5-SPS)
2 RPC 50x50 cm2 (small prototype 2&3)
ageing test (GIF):
2 RPC 50x50 cm2 (small prototype 2&3)
Signal amplitude with cosmics II
Signal
amplitude with cosmics III
beam test, setup - FEE
instability problem (I)
hp: local discharge
the temperature in correspondence of the discharge point
should increase appreciably
instability problem (II)
streamer contamination
% of streamer in the 25 tested positions at 3 different HVeff
(10000 V, 10100 V and 10200 V)
obtained with thresholds setting:
X plane: 8 mV
Y plane: 80 mV
the distributions of these
values are shown in next slide
streamer contamination distribution
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