Post on 15-Jan-2016
27/02/2002 M.D.P. - ATLAS Muon Week 1
First results of Atlas RPC cosmic First results of Atlas RPC cosmic rays testrays test
Massimo Della Pietra
Atlas RPC Group Napoli(M. Alviggi, V. Canale, M. Caprio, G. Carlino, F. Conventi,
R. de Asmundis, M.D.P., D. della Volpe, P. Iengo,
S.Patricelli, L.Romano, G. Sekhniaidze)
27/02/2002 M.D.P. - ATLAS Muon Week 2
OutlineOutline RPC cosmic rays test in Naples. Definitions. Test results.
Gap currents and single rates Full Plateau curves Cluster size
Conclusions.
27/02/2002 M.D.P. - ATLAS Muon Week 3
RPC Test in Naples RPC Test in Naples
First chamber under test in Naples: BOS-B-004.
32 strips or 32 strips were tested with cosmic rays using final receiversfinal receivers.
A complete scan of RPC performances with respect to HV and threshold values has been done.
27/02/2002 M.D.P. - ATLAS Muon Week 4
Splitter board
Shaper (50 ns)
Latch
Latch
Scaler
TDC
TDC
Shaper (50 ns)
VM
E
DAQ SetupDAQ Setup
Splitter board
27/02/2002 M.D.P. - ATLAS Muon Week 5
Current
0
0.5
1
1.5
2
2.5
9200 9400 9600 9800 10000 10200 10400 10600 10800HV
A
Gap 1
Gap 2
Gap 3
Gap 4
Gap currents Gap currents
27/02/2002 M.D.P. - ATLAS Muon Week 6
Single rate BOS-B 004
0
5000
10000
15000
20000
25000
9200 9400 9600 9800 10000 10200 10400 10600 10800
HV
Hz
Single ratesSingle rates
27/02/2002 M.D.P. - ATLAS Muon Week 7
Single ratesSingle rates
27/02/2002 M.D.P. - ATLAS Muon Week 8
Definitions (I)Definitions (I)
10000 muons have been triggered for each run with fixed HV and threshold.
To evaluate the RPC performances goldengolden tracks were selected (1 single hit for each layer in drift chambers) reducing the sample to about 5000 events.
27/02/2002 M.D.P. - ATLAS Muon Week 9
Definitions (II)Definitions (II)
Expected strip
Expected area
The RPC is considered to be efficient if there is an hit in the “expected area” (defined as the expected strip 5 mm).
27/02/2002 M.D.P. - ATLAS Muon Week 10
Definitions (III)Definitions (III)
Non physical cluster
Physical cluster
We define Physical
Cluster as the set of contiguous strips containing the expected one.
27/02/2002 M.D.P. - ATLAS Muon Week 11
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
strips: Efficiency vs. HVstrips: Efficiency vs. HV
27/02/2002 M.D.P. - ATLAS Muon Week 12
strips: Efficiency vs. Thresholdstrips: Efficiency vs. Threshold
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
27/02/2002 M.D.P. - ATLAS Muon Week 13
Mean N. of Clusters Mean N. of Clusters 1.01 @ (0.71mV,10500 V)1.01 @ (0.71mV,10500 V)
HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
Mean N. of Clusters Mean N. of Clusters 1.01 @ (0.71mV,10500 V)1.01 @ (0.71mV,10500 V)
HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
strips: N. of Clustersstrips: N. of Clusters
27/02/2002 M.D.P. - ATLAS Muon Week 14
Phys. cluster size Phys. cluster size 1.3 1.3 @ (0.71mV,10500 V)@ (0.71mV,10500 V)
HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
Phys. cluster size Phys. cluster size 1.3 1.3 @ (0.71mV,10500 V)@ (0.71mV,10500 V)
HV normalized HV normalized
@ 1013 mbar, 20.5@ 1013 mbar, 20.5ºCºC
strips: Cluster sizestrips: Cluster size
27/02/2002 M.D.P. - ATLAS Muon Week 15
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV not normalized! (DCS HV not normalized! (DCS
problem.) problem.)
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV not normalized! (DCS HV not normalized! (DCS
problem.) problem.)
strips: Efficiency vs. HVstrips: Efficiency vs. HV
27/02/2002 M.D.P. - ATLAS Muon Week 16
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV not normalized! (DCS HV not normalized! (DCS
problem.) problem.)
Plateau efficiency: ~ Plateau efficiency: ~ 96%96% TDC e LATCH results are TDC e LATCH results are
identical within identical within 0,1 %0,1 % HV not normalized! (DCS HV not normalized! (DCS
problem.) problem.)
strips: Efficiency vs. Thresholdstrips: Efficiency vs. Threshold
27/02/2002 M.D.P. - ATLAS Muon Week 17
Mean N. of Clusters Mean N. of Clusters 1.05 @ (0.59mV,10500 V)1.05 @ (0.59mV,10500 V)
HV not normalized! (DCS HV not normalized! (DCS problem) problem)
Mean N. of Clusters Mean N. of Clusters 1.05 @ (0.59mV,10500 V)1.05 @ (0.59mV,10500 V)
HV not normalized! (DCS HV not normalized! (DCS problem) problem)
strips: N. of Clustersstrips: N. of Clusters
27/02/2002 M.D.P. - ATLAS Muon Week 18
Phys. cluster size Phys. cluster size 1.4 1.4 @ (0.59 mV,10500 V)@ (0.59 mV,10500 V)
HV not normalized! (DCS HV not normalized! (DCS problem)problem)
Phys. cluster size Phys. cluster size 1.4 1.4 @ (0.59 mV,10500 V)@ (0.59 mV,10500 V)
HV not normalized! (DCS HV not normalized! (DCS problem)problem)
strips: Cluster sizestrips: Cluster size
27/02/2002 M.D.P. - ATLAS Muon Week 19
Both curves reach Both curves reach 96%96% of of efficiencyefficiency
HV not normalized to HV not normalized to compare the two curves !compare the two curves !
Both curves reach Both curves reach 96%96% of of efficiencyefficiency
HV not normalized to HV not normalized to compare the two curves !compare the two curves !
and and EfficiencyEfficiency
27/02/2002 M.D.P. - ATLAS Muon Week 20
and and Cluster sizeCluster size
strips are a little noisier strips are a little noisier than than strips (under strips (under investigation).investigation).
HV not normalized to HV not normalized to compare the two curves !compare the two curves !
strips are a little noisier strips are a little noisier than than strips (under strips (under investigation).investigation).
HV not normalized to HV not normalized to compare the two curves !compare the two curves !
27/02/2002 M.D.P. - ATLAS Muon Week 21
ConclusionsConclusions
The results show a good RPC behavior for both and plane: Efficiency 96 % Cluster size 1.3 - 1.4
TDC and LATCH give identical results with shaped signals.
The analysis tools to fully test up to 8 RPCs together are ready.
We’re ready for massive tests.
@ working point.