anti-2 test beam
DESCRIPTION
ANTI-2 Test Beam. Paolo Valente on behalf of the LAV team. Test beam objectives. Validate final version of front-end electronics plus modifications of voltage divider: Time-over-threshold vs. charge calibration curves Efficiency vs. threshold for electrons, hadrons and muons - PowerPoint PPT PresentationTRANSCRIPT
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ANTI-2 Test Beam
Paolo Valente on behalf of the LAV team
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Test beam objectives
1. Validate final version of front-end electronics plus modifications of voltage divider:a) Time-over-threshold vs. charge calibration curvesb) Efficiency vs. threshold for electrons, hadrons and muons
2. Test new FEE with TELL1 readout
All that on a full, final ANTI ring, and thus also checking:- construction techniques- cabling and connectors- new DB37 signal flanges- new ground feed-through on HV flange
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Test beam setup
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Read half of the channels:- 16 out of 32 channels for each of the 5 layers (5/10 DB37 connectors)
HV supplied to all 160 ch’s
(Luckily the gain equalization done in Frascati was fine and we had not to change the HV settings)
Signal and HV flanges
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Side B
Channel 10
Channel 1 (17, 33, 49, 65)
Side A (powered, but not read-out)
Readout map
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Readout configurations
We have used three different configurations:• Phase 1: readout by 5 FE boards as in 2009 test:
– 5×16 input ch’s Threshold 5×16 out LVDS TDC – 5×16 input ch’s 5×16 analog out delays QDC
• Phase 2: insert prototype of final FE board:– 8 input ch’s 2 Thresholds 2×8 out LVDS TDC– 8 input ch’s 2 Analogue 4-fold sum delays QDC
• Phase 3: back to old FE boards – efficiency studies– final FE prototype connected to TELL1 for readout tests
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Setup (1)
Trigger:- 2 scintillators (cross) in “front” of the ANTI-2, defining a 6×6 cm2 area (AND)
- 1 scintillator on the “back” generally NOT used as veto, but only for checking longitudinal containment
“front”
“back”
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Setup (2)
2 beam Cerenkov counters (TDC & QDC):– Operated at two different pressures to have, in a
given momentum range:• Cerenkov A: threshold between e and m • Cerenkov B: threshold between m and p
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Focus at wire chamber + 2m
Cerenkov
Beam scintillator
Trigger scintillators
Setup (3)
Beam
Wire chamber
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10 26 42 58 74
9 25 41 57 73
11 27 43 59 75
1228
44 60 76
13 2945 61 77
8 24 40
Most hit crystals map
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Layer 1
Layer 2
Layer 3
Layer 4
Layer 5
Scintillators & coincidence
New front-end board(double threshold)
Empty
Online counts (TDC)
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TDC hit-map
channel #
# of
hits
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Preliminary results: time-over-threshold calibration
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Charge vs. ToT
Run 627, Threshold=4 mV Run 638, Threshold=8 mV
ToT (ns)
QD
C (p
C)
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Charge vs. ToT
Run 627, Threshold=4 mV Run 638, Threshold=8 mV
Threshold not changed (broken test point)
ToT (ns)
QD
C (p
C)
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Charge vs. ToT Run 178
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An effect due to geometry?...
58
25 41
11 27 43 59
28
57
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…or the usual jump due to threshold crossing?
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New FE board
8 channels × thresholds:
Channel 10, 11Channel 26, 27
Channel 41, 42Channel 58Channel 74
Analog sum 1
Analog sum 2
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Run 202
Run 178
ToT (ns)
QD
C (p
C)
Old FE boardQDC is fed with individual channel analog signal (channel 41)
New FE boardQDC is fed with 4-fold analog sum (channels 41+42+58+74)In final configuration, this will be the sum of the four crystals in one “banana”
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Total charge with ToT vs. QDC
4th order polynomial parametrization of charge vs. ToT curve
Compare charge from QDC with charge from ToT
0.3 GeV run
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Preliminary results: muon efficiency
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Muon selectionSc
intil
lato
r 2 (
pC)
Scintillator 1 (pC)
+ ask for hit crystal in previous and following layer+ isolation cut (allowed only additional hit in the nearby crystal)
Scin
tilla
tor 2
(pC
)Scintillator 1 (pC)
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FE threshold
Black: all eventsRed: with TDC hit
Charge (pC)
Threshold = 8 mV
Make the ratio,Fit the threshold profile
Profiting of the only muon runs…(Lau configuration: 8 GeV hadrons + beam stopper,fully open collimators)
Effici
ency
Charge (pC)
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Threshold calibrationTh
resh
old
(pC)
Threshold (mV)
From known threshold, extract mVpC conversion
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Muon efficiency
Threshold (mV)
Effici
ency
Layer 5Layer 4Layer 3Layer 2Layer 1
Muon runs
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Monte Carlo (K. Massri)
Layer 1 data
Muon runs
Threshold (pC)
Effici
ency
… but a lot of work is needed in order to have a better understanding of data, Just one example: what is the effect of the mis-tagging of the scintillators trigger?
Muon efficiency vs. threshold
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Monte Carlo (K. Massri)
Layer 2 data
Muon runs
Threshold (pC)
Effici
ency
… moreover, the horizontal scale depends on the photo-electron to pC conversion factor (and thus on the exact gain)
Muon efficiency vs. threshold
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Considerations on efficiency studiesWe should consider that this will not be the way photons will hit
our veto stations
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Comparison with Monte Carlo
Fraction of energy in veto station (E0=0.5 GeV) vs. azimuthal and polar angles (and projections)
D. Di Filippo
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We have tried to perform an horizontal scan (+10 cm, +20 cm towards the center of the ring) by moving our trigger scintillators, in order to check the impact of the lateral “cracks”.Since we did not move the ANTI-2, one should take into account also the angle.Analysis is ongoing…
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Preliminary results: electron selection
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Cerenkov countersCe
renk
ov 2
(pC
)
Cerenkov 1 (pC)
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Run 656
Electron selection
Total Energy (pC)AllScintillatorsScintillators + Cerenkov
Run 663
0.5 GeV 1 GeV
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Electron selection
Total Energy (pC)AllScintillatorsScintillators + Cerenkov
Run 647
2 GeV
Run 548
3.5 GeV
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New FE + TELL1 test
- 4 crystals on layer 1 and 4 crystals on layer 2 on opposite hemisphere with respect to beam impact point (only muon halo events) - fed to new FE board- readout by TDCB on TELL1
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To do list
• To do: o Data quality: • Selection of good runs, check all channels, hardware
changes, etc.o Time resolutiono Electron efficiency vs. energy:• In order to do this, we have to improve on the tagging
of the incoming particle, e.g. we can ask for a deposit in the crystal in the first
o Linearity, containment vs. impact point, etc.
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Conclusions
• All in all, the ANTI-2 test was positive from the point of view of:– Signal and HV flanges modifications– New FE board functionality (both for ToT discriminator and for analog
sum circuit)– Basic test of FE board/TELL1 + TDC board matching
• We collected a lot of useful data (still to be analyzed…):– We had runs at 0.3, 0.5, 1, 1.5, 2, 3, 4, 6, 8 GeV (with steeply
decreasing fraction of electrons/muons+pions) and also dedicated purely muons runs
• We have performed threshold scans and a threshold vs. energy calibration, demonstrating that in a good noise (grounding) situation we can work at a fraction of MIP (1/3 maybe even 1/4)
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Useful info
E-logbook
Data repository
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Special acknowledgements
In addition to all the members of the LAV team:• Horst Brueker, PS & SPS coordinator• Lau Gatignon, for continuous support with the beam• Antonino Sergi, “special guest” of the entire test, putting his
hands in almost everything• Gianluca Lamanna, Bruno Angelucci, TELL1 gurus