Post on 19-Oct-2020
Updates on November 2015
BTF ECAL analysis
Gabriele Piperno 01 Mar 2016
PADME General meeting
2
Test beam summary
To test• Calorimeter: 2x 9 BGO crystals (APD and PMT)• Active target: 2x2cm 50μm thick diamond with 19 1mm horizontal and vertical “sensitive” strips
Study performed with e+ produced by e+ or e- impinging on a target. Depending on the primary beam, secondary e+ shows a little different behavior.
Date: 16-30 November 2015
3
Runs summary
3
Runs summaryC
onsi
dere
d fo
r th
e pr
esen
t an
alys
is
4
PMT setup• 1’’ Hamamatsu R22-38 PMT• 9 truncated pyramid original L3 BGO crystals (24cm length, 2.2×2.2cm2 small face, 3×3cm2 large face)• teflon painting• stable structure • PMT not touching BGO • PMT gains ≃105 (central one ≃20% smaller)
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 0 PMT 1 Raw CountsECAL Ch 0 PMT 1 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 1 PMT 2 Raw CountsECAL Ch 1 PMT 2 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 2 PMT 3 Raw CountsECAL Ch 2 PMT 3 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 3 PMT 4 Raw CountsECAL Ch 3 PMT 4 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 4 PMT 5 Raw CountsECAL Ch 4 PMT 5 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 5 PMT 6 Raw CountsECAL Ch 5 PMT 6 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 6 PMT 7 Raw CountsECAL Ch 6 PMT 7 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 7 PMT 8 Raw CountsECAL Ch 7 PMT 8 Raw Counts
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
3500
4000
ECAL Ch 8 PMT 9 Raw CountsECAL Ch 8 PMT 9 Raw Counts
5
Raw signalsSignals registered with a V1742 CAEN board:• 1024 samples• 1GHz sampling frequency (1ms window)• 1V full scale (PMT ➘: [-1,0]V, APD ➚: [0,1]V)• 12-bit resolution (4096 counts, 0.24mV/count)
y-scale: [0,4096]counts
Example of a non-centered and saturated event (PMT 431MeV)
Not complete recover (theoretically visible starting from 8MeV)
200
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 0 PMT 1 (Ch 0) SignalECAL Ch 0 PMT 1 (Ch 0) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 1 PMT 2 (Ch 1) SignalECAL Ch 1 PMT 2 (Ch 1) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 2 PMT 3 (Ch 2) SignalECAL Ch 2 PMT 3 (Ch 2) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 3 PMT 4 (Ch 3) SignalECAL Ch 3 PMT 4 (Ch 3) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 4 PMT 5 (Ch 4) SignalECAL Ch 4 PMT 5 (Ch 4) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 5 PMT 6 (Ch 5) SignalECAL Ch 5 PMT 6 (Ch 5) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 6 PMT 7 (Ch 6) SignalECAL Ch 6 PMT 7 (Ch 6) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 7 PMT 8 (Ch 7) SignalECAL Ch 7 PMT 8 (Ch 7) Signal
0 200 400 600 800 10001<
0.8<
0.6<
0.4<
0.2<
0
ECAL Ch 8 PMT 9 (Ch 8) SignalECAL Ch 8 PMT 9 (Ch 8) Signal
6
mV signals (old method)
mV signal to charge:Q(pC) = ∑weight×signal(mV)×50(Ohm)×10-9(s)/10-12
Counts to mV:signal(mV) = (signal(counts)-avg)/4096
weight(Central channel PMT) = 1.21weight(all other channels) = 1
Same event of previous slide
y-scale: [-1,0.02]V(to accommodate the baseline
oscillations around 0)
To pass from C to pC
average baseline evaluated w/ the firsts 180 samples
ECAL - Position run 305
6− 4− 2− 0 2 4 66−
4−
2−
0
2
4
6 ECALPosPMTEntries 100000Mean x 0.05219− Mean y 0.04553RMS x 0.8508RMS y 0.8675
ECAL - Position run 305ECALQCh0Entries 100000Mean 67.96RMS 191.9
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh0Entries 100000Mean 67.96RMS 191.9
ECAL Ch 0 PMT 1 ChargeECALQCh1Entries 100000Mean 105.7RMS 238.1
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh1Entries 100000Mean 105.7RMS 238.1
ECAL Ch 1 PMT 2 ChargeECALQCh2
Entries 100000Mean 83.21RMS 210.6
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh2Entries 100000Mean 83.21RMS 210.6
ECAL Ch 2 PMT 3 Charge
ECALQCh3Entries 100000Mean 272.3RMS 754.9
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh3Entries 100000Mean 272.3RMS 754.9
ECAL Ch 3 PMT 4 ChargeECALQCh4Entries 100000Mean 1161RMS 2239
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh4Entries 100000Mean 1161RMS 2239
ECAL Ch 4 PMT 5 ChargeECALQCh5
Entries 100000Mean 486.1RMS 1230
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh5Entries 100000Mean 486.1RMS 1230
ECAL Ch 5 PMT 6 Charge
ECALQCh6Entries 100000Mean 61.12RMS 180.5
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh6Entries 100000Mean 61.12RMS 180.5
ECAL Ch 6 PMT 7 ChargeECALQCh7Entries 100000Mean 83.42RMS 208.6
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh7Entries 100000Mean 83.42RMS 208.6
ECAL Ch 7 PMT 8 ChargeECALQCh8
Entries 100000Mean 80.06RMS 218.8
0 2000 4000 6000 8000 10000
1
10
210
310
410
ECALQCh8Entries 100000Mean 80.06RMS 218.8
ECAL Ch 8 PMT 9 Charge
7
PMT run 305 (1)E = 297MeV
Single channel spectra (bin = 5 pC)
Interaction position
Position x [cm]
Posi
tion
y [c
m]
ECALQTotPMTEntries 41342
Mean 1213
RMS 2715
/ ndf 2r 1.435e+04 / 219
A1 9.271e+01± 1.229e+04 1 µ 0.0±85 <
1 m 0.08± 31.42
A2 7.8± 515.2 2 µ 3.7± 6030
2 m 2.7± 279.1
A3 1.12± 13.26 3 µ 3.533e+01± 1.009e+04
3 m 50.3± 653.8
Charge [pC]0 5000 10000 15000 20000
Cou
nts
1
10
210
310
410
ECALQTotPMTEntries 41342
Mean 1213
RMS 2715
/ ndf 2r 1.435e+04 / 219
A1 9.271e+01± 1.229e+04 1 µ 0.0±85 <
1 m 0.08± 31.42
A2 7.8± 515.2 2 µ 3.7± 6030
2 m 2.7± 279.1
A3 1.12± 13.26 3 µ 3.533e+01± 1.009e+04
3 m 50.3± 653.8
ECAL - Total Charge run 305Charge spectrum of
voltage saturated events (bin = 25 pC)
ECALQTotSatPMT
Entries 3513
Mean 1.306e+04
RMS 2820
0 5000 10000 15000 20000
1
10
210
ECALQTotSatPMT
Entries 3513
Mean 1.306e+04
RMS 2820
ECAL - Total Charge Saturated run 305
8
PMT run 305 (2)E = 297MeV
Charge spectrum (bin = 25 pC)
• Not saturated• 0.3cm from position (0;0)
SignalBackground
• Saturated (at least 1 over 9)• 0.3cm from position (0;0)
ECALQTotPMTEntries 41342
Mean 89.5<
RMS 35.45 / ndf 2r 1.026e+04 / 368
A1 1.376e+02± 1.561e+04 1 µ 0.1±107.9 <
1 m 0.09± 15.27
A2 3.9± 258 2 µ 3.6± 6030
2 m 2.6± 276.8
Charge [pC]400< 200< 0 200 400 600 800
Cou
nts
1
10
210
310
410
ECALQTotPMTEntries 41342
Mean 89.5<
RMS 35.45 / ndf 2r 1.026e+04 / 368
A1 1.376e+02± 1.561e+04 1 µ 0.1±107.9 <
1 m 0.09± 15.27
A2 3.9± 258 2 µ 3.6± 6030
2 m 2.6± 276.8
ECAL - Total Charge run 305ECALQCh0Entries 100000
Mean 2.461<
RMS 13.39
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
10
210
310
410
ECALQCh0Entries 100000
Mean 2.461<
RMS 13.39
ECAL Ch 0 PMT 1 ChargeECALQCh1Entries 100000
Mean 4.419<
RMS 9.546
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh1Entries 100000
Mean 4.419<
RMS 9.546
ECAL Ch 1 PMT 2 ChargeECALQCh2Entries 100000
Mean 1.896<
RMS 12.63
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh2Entries 100000
Mean 1.896<
RMS 12.63
ECAL Ch 2 PMT 3 Charge
ECALQCh3Entries 100000
Mean 5.34<
RMS 9.459
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh3Entries 100000
Mean 5.34<
RMS 9.459
ECAL Ch 3 PMT 4 ChargeECALQCh4Entries 100000
Mean 7.68<
RMS 7.19
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh4Entries 100000
Mean 7.68<
RMS 7.19
ECAL Ch 4 PMT 5 ChargeECALQCh5Entries 100000
Mean 4.435<
RMS 9.254
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh5Entries 100000
Mean 4.435<
RMS 9.254
ECAL Ch 5 PMT 6 Charge
ECALQCh6Entries 100000
Mean 2.939<
RMS 11.78
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh6Entries 100000
Mean 2.939<
RMS 11.78
ECAL Ch 6 PMT 7 ChargeECALQCh7Entries 100000
Mean 5.707<
RMS 8.705
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
310
410
ECALQCh7Entries 100000
Mean 5.707<
RMS 8.705
ECAL Ch 7 PMT 8 ChargeECALQCh8Entries 100000
Mean 4.546<
RMS 11.59
Charge [pC]50< 40< 30< 20< 10< 0 10 20 30 40 50
Cou
nts
1
10
210
310
410
ECALQCh8Entries 100000
Mean 4.546<
RMS 11.59
ECAL Ch 8 PMT 9 Charge
9
Charge pedestal problem
• Not saturated• 0.3cm from position (0;0)
SignalBackground
Single channel spectrum pedestals (bin = 5 pC)
Global spectrum pedestal (bin = 25 pC)
EmptyEvCh0n15Entries 1321984Mean 512.1RMS 295.6
0 200 400 600 800 1000
3720
3725
3730
3735
3740
3745
3750
EmptyEvCh0n15Entries 1321984Mean 512.1RMS 295.6
Ch 0 PMT 1 empty events n.15
10
Pedestal position origin
• Baseline non-null slope• flat fit on first (70-180) samples
raw event
Q(pedestal) ≠ 0
Sample
Raw
cou
nts
ECALQCh0Entries 161740
Mean 73.04
RMS 193.5
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh0Entries 161740
Mean 73.04
RMS 193.5
ECAL Ch 0 PMT 1 ChargeECALQCh1Entries 161740
Mean 112.6
RMS 238.5
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh1Entries 161740
Mean 112.6
RMS 238.5
ECAL Ch 1 PMT 2 ChargeECALQCh2Entries 161740
Mean 84.08
RMS 202.9
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh2Entries 161740
Mean 84.08
RMS 202.9
ECAL Ch 2 PMT 3 Charge
ECALQCh3Entries 161740
Mean 290.3
RMS 766.8
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh3Entries 161740
Mean 290.3
RMS 766.8
ECAL Ch 3 PMT 4 ChargeECALQCh4Entries 161740
Mean 1211
RMS 2261
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh4Entries 161740
Mean 1211
RMS 2261
ECAL Ch 4 PMT 5 ChargeECALQCh5Entries 161740
Mean 483.6
RMS 1196
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh5Entries 161740
Mean 483.6
RMS 1196
ECAL Ch 5 PMT 6 Charge
ECALQCh6Entries 161740
Mean 68.07
RMS 182.1
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh6Entries 161740
Mean 68.07
RMS 182.1
ECAL Ch 6 PMT 7 ChargeECALQCh7Entries 161740
Mean 92.02
RMS 209.6
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh7Entries 161740
Mean 92.02
RMS 209.6
ECAL Ch 7 PMT 8 ChargeECALQCh8Entries 161740
Mean 84.88
RMS 212.5
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh8Entries 161740
Mean 84.88
RMS 212.5
ECAL Ch 8 PMT 9 Charge
ECALQCh0Entries 161740
Mean 4.908
RMS 15.85
Charge [pC]40< 20< 0 20 40 60
Cou
nts
210
310
410
ECALQCh0Entries 161740
Mean 4.908
RMS 15.85
ECAL Ch 0 PMT 1 ChargeECALQCh1Entries 161740
Mean 2.277
RMS 10.59
Charge [pC]40< 20< 0 20 40 60
Cou
nts
10
210
310
410
ECALQCh1Entries 161740
Mean 2.277
RMS 10.59
ECAL Ch 1 PMT 2 ChargeECALQCh2Entries 161740
Mean 4.399
RMS 14.75
Charge [pC]40< 20< 0 20 40 60
Cou
nts
10
210
310
410
ECALQCh2Entries 161740
Mean 4.399
RMS 14.75
ECAL Ch 2 PMT 3 Charge
ECALQCh3Entries 161740
Mean 1.861
RMS 9.826
Charge [pC]40< 20< 0 20 40 60
Cou
nts
1
10
210
310
410
ECALQCh3Entries 161740
Mean 1.861
RMS 9.826
ECAL Ch 3 PMT 4 ChargeECALQCh4Entries 161740
Mean 0.6368
RMS 5.952
Charge [pC]40< 20< 0 20 40 60
Cou
nts
1
10
210
310
410
ECALQCh4Entries 161740
Mean 0.6368
RMS 5.952
ECAL Ch 4 PMT 5 ChargeECALQCh5Entries 161740
Mean 1.792
RMS 9.321
Charge [pC]40< 20< 0 20 40 60
Cou
nts
1
10
210
310
410
ECALQCh5Entries 161740
Mean 1.792
RMS 9.321
ECAL Ch 5 PMT 6 Charge
ECALQCh6Entries 161740
Mean 4.454
RMS 14.98
Charge [pC]40< 20< 0 20 40 60
Cou
nts
10
210
310
410
ECALQCh6Entries 161740
Mean 4.454
RMS 14.98
ECAL Ch 6 PMT 7 ChargeECALQCh7Entries 161740
Mean 2.167
RMS 10.82
Charge [pC]40< 20< 0 20 40 60
Cou
nts
1
10
210
310
410
ECALQCh7Entries 161740
Mean 2.167
RMS 10.82
ECAL Ch 7 PMT 8 ChargeECALQCh8Entries 161740
Mean 3.786
RMS 14.21
Charge [pC]40< 20< 0 20 40 60
Cou
nts
10
210
310
410
ECALQCh8Entries 161740
Mean 3.786
RMS 14.21
ECAL Ch 8 PMT 9 Charge
11
Baseline linear fitLinear fit to last empty event up to sample 980 (to exclude last problematic samples) to:• evaluate the charge (by subtraction)• verify the presence of a pulse (3 consecutive pts > 2 bsl RMS) bin = 1 pCbin = 1 pC
ECALQTotPMTEntries 25373Mean 0.06339RMS 24.13
/ ndf 2r 2.537e+04 / 1681A1 367.9± 966.9
1 µ 62.43±52.28 < 1 m 24234.709± 0.108
Charge [pC]100< 50< 0 50 100 150
Cou
nts
1
10
210
310
ECALQTotPMTEntries 25373Mean 0.06339RMS 24.13
/ ndf 2r 2.537e+04 / 1681A1 367.9± 966.9
1 µ 62.43±52.28 < 1 m 24234.709± 0.108
ECAL - Total Charge run 305ECALQTotPMT
Entries 25373Mean 3485RMS 3413
/ ndf 2r 2098 / 435A1 72.1± 5901
1 µ 0.182±1.083 < 1 m 0.15± 18.97
A2 5.2± 444 2 µ 2.8± 5946 2 m 2.0± 270.8
Charge [pC]0 5000 10000 15000 20000
Cou
nts
1
10
210
310
ECALQTotPMTEntries 25373Mean 3485RMS 3413
/ ndf 2r 2098 / 435A1 72.1± 5901
1 µ 0.182±1.083 < 1 m 0.15± 18.97
A2 5.2± 444 2 µ 2.8± 5946 2 m 2.0± 270.8
ECAL - Total Charge run 305
12
Baseline linear fit global spectrumCharge spectrum
(bin = 25 pC)Global spectrum
pedestal (bin = 3 pC)
SignalBackground
• Not saturated• 0.3cm from position (0;0)
ECALQTotPMTEntries 14594Mean 6002RMS 2222
/ ndf 2r 1813 / 425A1 43.9± 683.9
1 µ 2.1±27.5 < 1 m 1.40± 45.63
A2 5.1± 439.4 2 µ 2.8± 5935 2 m 2.0± 270.9
Charge [pC]0 5000 10000 15000 20000
Cou
nts
1
10
210
310ECALQTotPMT
Entries 14594Mean 6002RMS 2222
/ ndf 2r 1813 / 425A1 43.9± 683.9
1 µ 2.1±27.5 < 1 m 1.40± 45.63
A2 5.1± 439.4 2 µ 2.8± 5935 2 m 2.0± 270.9
ECAL - Total Charge run 305
13
“Final” spectrum v.1• Fit subtraction• Zero-suppression• Q = 0 & IsPulse = false if (Q < 0 || IsPulse = false)
⇒ IsPulse [bool] = true if there is a pulse (3 consecutive pts > 2 bsl RMS)
ECALEmptyEvCh0Entries 6.60695e+07Mean 512.1RMS 295.6
0 200 400 600 800 1000
3730
3732
3734
3736
3738
3740
3742
3744
3746
3748 ECALEmptyEvCh0Entries 6.60695e+07Mean 512.1RMS 295.6
ECAL Ch 0 PMT 1 last empty event
14
Average empty pulse subtraction50 empty events to built the average empty pulse (1 per channel). Used to:
raw avg event
• evaluate the charge (by subtraction)• not to verify the presence of pulse (due to a small bump at the peak position)
ECALQCh0Entries 161740
Mean 74.41
RMS 196.4
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh0Entries 161740
Mean 74.41
RMS 196.4
ECAL Ch 0 PMT 1 ChargeECALQCh1Entries 161740
Mean 114
RMS 242
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh1Entries 161740
Mean 114
RMS 242
ECAL Ch 1 PMT 2 ChargeECALQCh2Entries 161740
Mean 85.47
RMS 206
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh2Entries 161740
Mean 85.47
RMS 206
ECAL Ch 2 PMT 3 Charge
ECALQCh3Entries 161740
Mean 294.5
RMS 778.6
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh3Entries 161740
Mean 294.5
RMS 778.6
ECAL Ch 3 PMT 4 ChargeECALQCh4Entries 161740
Mean 1219
RMS 2279
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh4Entries 161740
Mean 1219
RMS 2279
ECAL Ch 4 PMT 5 ChargeECALQCh5Entries 161740
Mean 490.9
RMS 1215
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh5Entries 161740
Mean 490.9
RMS 1215
ECAL Ch 5 PMT 6 Charge
ECALQCh6Entries 161740
Mean 68.97
RMS 184.8
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh6Entries 161740
Mean 68.97
RMS 184.8
ECAL Ch 6 PMT 7 ChargeECALQCh7Entries 161740
Mean 93.2
RMS 212.7
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh7Entries 161740
Mean 93.2
RMS 212.7
ECAL Ch 7 PMT 8 ChargeECALQCh8Entries 161740
Mean 86.04
RMS 215.6
Charge [pC]0 2000 4000 6000 8000 10000
Cou
nts
1
10
210
310
410
ECALQCh8Entries 161740
Mean 86.04
RMS 215.6
ECAL Ch 8 PMT 9 Charge
ECALQCh0Entries 161740
Mean 4.931
RMS 15.01
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh0Entries 161740
Mean 4.931
RMS 15.01
ECAL Ch 0 PMT 1 ChargeECALQCh1Entries 161740
Mean 2.013
RMS 9.886
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh1Entries 161740
Mean 2.013
RMS 9.886
ECAL Ch 1 PMT 2 ChargeECALQCh2Entries 161740
Mean 4.299
RMS 13.96
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh2Entries 161740
Mean 4.299
RMS 13.96
ECAL Ch 2 PMT 3 Charge
ECALQCh3Entries 161740
Mean 1.726
RMS 9.324
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh3Entries 161740
Mean 1.726
RMS 9.324
ECAL Ch 3 PMT 4 ChargeECALQCh4Entries 161740
Mean 0.4312
RMS 5.217
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh4Entries 161740
Mean 0.4312
RMS 5.217
ECAL Ch 4 PMT 5 ChargeECALQCh5Entries 161740
Mean 1.571
RMS 8.622
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh5Entries 161740
Mean 1.571
RMS 8.622
ECAL Ch 5 PMT 6 Charge
ECALQCh6Entries 161740
Mean 4.343
RMS 14.51
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh6Entries 161740
Mean 4.343
RMS 14.51
ECAL Ch 6 PMT 7 ChargeECALQCh7Entries 161740
Mean 2.007
RMS 10.49
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
1
10
210
310
410
ECALQCh7Entries 161740
Mean 2.007
RMS 10.49
ECAL Ch 7 PMT 8 ChargeECALQCh8Entries 161740
Mean 3.649
RMS 13.52
Charge [pC]30< 20< 10< 0 10 20 30 40 50 60 70
Cou
nts
10
210
310
410
ECALQCh8Entries 161740
Mean 3.649
RMS 13.52
ECAL Ch 8 PMT 9 Charge
15
Avg empty pulse sub. spectra
bin = 1 pC bin = 1 pC
ECALQTotPMTEntries 25832Mean 4.001< RMS 26.53
/ ndf 2r 2.121e+04 / 1695A1 11.7± 574.2
1 µ 0.19±18.97 < 1 m 0.136± 9.627
Charge [pC]300< 200< 100< 0 100 200 300
Cou
nts
1
10
210
310
ECALQTotPMTEntries 25832Mean 4.001< RMS 26.53
/ ndf 2r 2.121e+04 / 1695A1 11.7± 574.2
1 µ 0.19±18.97 < 1 m 0.136± 9.627
ECAL - Total Charge run 305ECALQTotPMT
Entries 25832Mean 3473RMS 3467
/ ndf 2r 2084 / 438
A1 82.2± 6484 1 µ 0.253±5.154 <
1 m 0.1± 16.6
A2 5.1± 439 2 µ 2.8± 6034 2 m 2.0± 273.3
A3 0.71± 11.54 3 µ 2.697e+01± 1.012e+04 3 m 33.9± 629.4
A4 0.230± 3.369 4 µ 6.458e+01± 1.538e+04 4 m 19.7± 700
Charge [pC]0 5000 10000 15000 20000
Cou
nts
1
10
210
310
410ECALQTotPMT
Entries 25832Mean 3473RMS 3467
/ ndf 2r 2084 / 438
A1 82.2± 6484 1 µ 0.253±5.154 <
1 m 0.1± 16.6
A2 5.1± 439 2 µ 2.8± 6034 2 m 2.0± 273.3
A3 0.71± 11.54 3 µ 2.697e+01± 1.012e+04 3 m 33.9± 629.4
A4 0.230± 3.369 4 µ 6.458e+01± 1.538e+04 4 m 19.7± 700
ECAL - Total Charge run 305
16
Avg empty pulse sub. global spectrumCharge spectrum
(bin = 25 pC)Global spectrum
pedestal (bin = 3 pC)
SignalBackground
• Not saturated• 0.3cm from position (0;0)
ECALQTotPMTEntries 14781Mean 6056RMS 2304
/ ndf 2r 1148 / 432A1 73.9± 968.3
1 µ 1.4±27.5 < 1 m 1.39± 39.43
A2 5.1± 437.2 2 µ 2.8± 6033 2 m 2.0± 273.8
A3 0.8± 12.1 3 µ 2.357e+01± 1.013e+04 3 m 32.0± 597.7
Charge [pC]0 5000 10000 15000 20000
Cou
nts
1
10
210
310
ECALQTotPMTEntries 14781Mean 6056RMS 2304
/ ndf 2r 1148 / 432A1 73.9± 968.3
1 µ 1.4±27.5 < 1 m 1.39± 39.43
A2 5.1± 437.2 2 µ 2.8± 6033 2 m 2.0± 273.8
A3 0.8± 12.1 3 µ 2.357e+01± 1.013e+04 3 m 32.0± 597.7
ECAL - Total Charge run 305
17
“Final” spectrum v.2• Avg empty pulse subtraction• Zero-suppression• Q = 0 & IsPulse = false if (Q < 0 || IsPulse = false)
⇒ IsPulse [bool] = true if there is a pulse (3 consecutive pts > 2 bsl RMS)
18
Resolutions comparison
“Original” Fit subtraction Avg subtractionFit subtraction
+ zero-suppression
Avg subtraction + zero-
suppression
Reso @1 GeV [%]
2.46 2.48 2.47 2.47 2.46
Pedestal position
[pC]-108 2 peaks: ±15 2 peaks: ±10 0 (by definition) 0 (by definition)
All energy resolutions are compatible irrespectively of the analysis approach
RMSCh4Entries 108418Mean 3.636RMS 0.5166
0 2 4 6 8 10 12 14
1
10
210
310
RMSCh4Entries 108418Mean 3.636RMS 0.5166
Linear fit RMS Ch 4 PMT 5
19
Baseline RMS
AngCoeffCh4Entries 108418Mean 0.002938RMS 0.001545
0.03< 0.025< 0.02< 0.015< 0.01< 0.005< 0 0.005 0.01 0.015
1
10
210
310
410
AngCoeffCh4Entries 108418Mean 0.002938RMS 0.001545
Linear fit angular coefficient Ch 4 PMT 5
20
Linear fit angular coefficients
InterceptCh4Entries 108418Mean 3752RMS 1.1
3730 3735 3740 3745 3750 3755
1
10
210
310
410
InterceptCh4Entries 108418Mean 3752RMS 1.1
Linear fit intercept Ch 4 PMT 5
21
Linear fit intercept
6< 4< 2< 0 2 4 66<
4<
2<
0
2
4
6 ECALPosPMTEntries 100000Mean x 0.05219< Mean y 0.04553RMS x 0.8508RMS y 0.8675
1
10
210
310
ECALPosPMTEntries 100000Mean x 0.05219< Mean y 0.04553RMS x 0.8508RMS y 0.8675
ECAL - Position run 305
6< 4< 2< 0 2 4 66<
4<
2<
0
2
4
6 ECALPosPMTEntries 161740Mean x 0.004722Mean y 0.1679RMS x 1.267RMS y 1.188
1
10
210
310
ECALPosPMTEntries 161740Mean x 0.004722Mean y 0.1679RMS x 1.267RMS y 1.188
ECAL - Position run 305
22
Position problemInteraction point by proportional weighting of the charge
position can go outside the [-2,2] cm range in x and y
Position x [cm]
Posi
tion
y [c
m]
Position x [cm]
Posi
tion
y [c
m]
Charge fluctuations become important near zero
Two
diffe
rent
cod
e im
plem
enta
tions
The problem
6< 4< 2< 0 2 4 66<
4<
2<
0
2
4
6 ECALPosPMTEntries 67164Mean x 0.1234< Mean y 0.1933RMS x 1.079RMS y 0.8201
1
10
210
310
ECALPosPMTEntries 67164Mean x 0.1234< Mean y 0.1933RMS x 1.079RMS y 0.8201
ECAL - Position run 305
6< 4< 2< 0 2 4 66<
4<
2<
0
2
4
6 ECALPosPMTEntries 76011Mean x 0.133< Mean y 0.3117RMS x 1.122RMS y 0.8988
1
10
210
310
ECALPosPMTEntries 76011Mean x 0.133< Mean y 0.3117RMS x 1.122RMS y 0.8988
ECAL - Position run 305
23
“Final” position
Position x [cm]
Posi
tion
y [c
m]
• Avg empty pulse subtraction• Zero-suppression• Q = 0 & IsPulse = false if (Q > 0 || IsPulse = false)
Now position is in the correct rangePosition x [cm]
Posi
tion
y [c
m]
From avg pulse subtraction From fit subtraction
24
Conclusions• Last ≃10/15 window samples are particularly problematic• Baseline slope can be recovered by means of a linear fit or an avg empty pulse subtraction• Avg pulse subtraction results can be improved w/ a trigger dedicated to collect empty events (lower threshold)• Now position is in [-2,2] cm range, both in x and y• Position results can be improved w/ a non linear weighting (probably needed a larger ECAL for tests)• Zero-suppression works fine• Threshold <1 MeV (20 pC) is achievable
25Back
up
26
APD setup• 1×1cm2 Hamamatsu S8664-1010 Si APD• 9 2×2×22cm3 L3 BGO crystals (cut and polished)• teflon wrapping• not stable and very homemade structure (e.g. BGO are leaning against the APD faces)• APD equalized gains =200