Update of analysis of technical run data
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Update of analysis of technical run data
T. Spadaro
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Done in the past:- block by block time resolution- T0 correction per column of blocks- muon clustering algorithm- first studies of time correlation with other detectors
Update:- absolute time-zero correction block by block- Novel time reconstruction for LAV, analysis of hit topologies- Analysis of time distributions and LAV-CHOD correlation
To do:- efficiency studies for photons
Outline: done and to do
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
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Data of run 390:- 1 CHOD
candidate and 1 Cedar candidate in time
- 1 cluster on LKr in time + 1 additional LKr cluster close in space with CHOD hit
- Occupancy of few %
Study of hit categories on data
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
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Data of run 390:- 1 CHOD candidate
and 1 Cedar candidate in time
- 1 cluster on LKr in time + 1 additional LKr cluster close in space with CHOD hit
- Event selection aiming at enriching LAV content
Analyze TDC hit pairs for Low and High threshold of the same physical channel
Study of hit categories on data
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
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Data of run 390:- 1 CHOD candidate
and 1 Cedar candidate in time
- 1 cluster on LKr in time + 1 additional LKr cluster close in space with CHOD hit
- Event selection aiming at enriching LAV content
Analyze TDC hit pairs for Low and High threshold of the same physical channel
Study of hit categories on data
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 2
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Correlate leading hit times
Time correlation vs category: complete hits
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dTleading(High-Low) (ns)
?
Odd structure at negative and positive times, check if there are other hits for that channel in the same event
Plot dT vs NToT(Low)
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Check edge population for complete hits
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
status HighStation 1
dTleading(High-Low) (ns)
status Low
1 2 3 4 1 2 3 4 1 2 3 4NToT (Low) NToT (Low) NToT (Low)
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Correlate leading hit times
Leading-leading category
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dTleading(High-Low) (ns)
Both trailing edges lost due to HPTDC 5-ns dead time?
Is there a contribution from the 3-time-slot acquisition window? Plot dT vs T(DAQ,Low)
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Check DAQ effect for leading-leading category
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
status High
status Low
Station 1
TCedar – Tleading(High) (ns)
TCedar – Tleading(High) (ns)
“physics” peak
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Check DAQ effect for leading-leading category
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
status High
status Low
Station 1
Tleading(High) (ns)
TCedar (ns)
TCedar (ns)
Tleading(High) (ns)Tleading(High) (ns)
CompleteLeading-leading
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Correlate leading hit times
Leading-leading time correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dTleading(High-Low) (ns)
High-threshold trailing lost, due to HPTDC 5-ns dead time?
If so, ToT of Low threshold should be smaller than that for complete hits: Plot vs ToT(Low)
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High threshold trailing missing
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
dTleading(High-Low) (ns)
High-threshold trailing lost, due to HPTDC 5-ns dead time?If so, ToT of Low threshold should be smaller than that for complete hits
ToT(Low) (ns)
dTleading(High-Low) (ns)
ToT(Low) (ns)
True, but not always, maybe a DAQ effect is present, too?Check it by plotting also vs Tleading high
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Correlate leading hit times
Leading-leading time correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dTleading(High-Low) (ns)
Low-threshold trailing lost, due to DAQ window?
Plot dT vs Trail(DAQ, High)
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Correlate leading hit times
Leading-leading time correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dTtrailing(High-Low) (ns)
Where are both leading times?
Plot vs T(DAQ,Low)Plot vs NToTPlot vs NHit/event
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Trailing-trailing time correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
status High
status Low
Station 1
TCedar – Ttrailing(High) (ns)
TCedar – Ttrailing(Low) (ns)
“physics” peak
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Correlate leading hit times
Leading-leading time correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dTtrailing(High-Low) (ns)
High-threshold leading lost...... configuration of low threshold is strange (Tr-Le)
Check vs NToT(Low)Check vs T(DAQ,Tr, High)
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Correlate leading hit times
Leading-leading time correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Hit status definition:1: Tr-Tr 4: Le-Tr2: Tr-Le 5: Le (only hit)3: Le-Le 6: Tr (only hit)
status High
status Low
Station 1
dT(trailing High- leading Low) (ns)
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Run 392 (muon run), merged thanks to Giuseppe including LKr info
minimal request: 1 CHOD candidate
Use muon run for time calibration: rescale all of the LAV times by subtracting the LAV-CHOD time difference
Use High-threshold hits, global time resolution < 1 ns
Time calibration from muon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
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Use Low-threshold hits, since there is no slewing correction:
non-zero offset, ~ -3 ns (compatible with expectation: ~ Trise/2)
resolution worse, ~ 2ns
Time calibration from muon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
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CHOD population comparing muon and kaon run
Check LAV-CHOD correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
muon run
kaon run
YCH
OD
(cm
)
XCHOD (cm)
XCHOD (cm)
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Check CHOD-LAV alignment, muon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
DT (ns)
Df (rad)
Check time and position correlation with respect to CHOD, Hi-thr
a second peak 25-ns away, time-correlatedmuon run
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Select main time peak, plot a.u. ratio N(CHOD&LAV)/N(CHOD)
Check LAV-CHOD correlation
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
muon run
YCH
OD
(cm
)
XCHOD (cm)
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Compare muon and kaon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Check time and f correlation with respect to CHOD, low-threshold
second peak ~40 ns away from the main peakmuon run
kaon run
Df (rad)
Df (rad)
DT
CH
OD
-LAV(n
s)
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Compare muon and kaon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Second peak enhanced in the kaon run and for the low threshold
kaon run
muon run
TLAV (ns)
TLAV (ns)
DT
CH
OD
-LAV(n
s)
low threshold
low threshold
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Compare muon and kaon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Second peak enhanced in the kaon run and for the low threshold
kaon run
muon run
DTCHOD-LAV(ns)
low threshold
high threshold
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Compare muon and kaon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Second peak related to real muons: reflection of a physics signal
muon run
DfLAV-LAV(mrad)
high threshold
DT
LAV-L
AV
(ns)
2 hits in station 1 1 hit in station 1,1 hit in station 2
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Compare muon and kaon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Second peak appearance is channel dependent: check high threshold
muon run
Electronic channel of low threshold
DTCHOD-LAV (ns)
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Compare muon and kaon run
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Second peak appearance is channel dependent: check low threshold
muon run
Electronic channel of low threshold
low thresholdDTCHOD-LAV (ns)
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Conclusions and to-do
7/06/2013Update of analysis of Tech. run data - CERN - NA62 PVeto WG
Absolute time-zero correction block by block satisfactory- resolution < 1 ns on the entire LAV station
A secondary channel-dependent reflection peak biased the time alignment:
- maximum of event occupancy met when (part of) main peak and all of the secondary peak are sampled in the 75-ns DAQ window
- main peak is partly cut expect an effect on efficiency- effect of DAQ window has an impact on hit topologies
LAV-CHOD correlation studied in muon runs- Second peak related to real muons: reflection of a physics signal- geometrical correlation to be validated with MC
Final validation of LAV capability after optimization of HW setup will be done:
- muon runs, using specific channels completely contained in the DAQ window
- kaon runs, using photons (on going)