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

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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

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ECAL Ch 0 PMT 1 Raw CountsECAL Ch 0 PMT 1 Raw Counts

0 200 400 600 800 10000

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ECAL Ch 1 PMT 2 Raw CountsECAL Ch 1 PMT 2 Raw Counts

0 200 400 600 800 10000

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ECAL Ch 2 PMT 3 Raw CountsECAL Ch 2 PMT 3 Raw Counts

0 200 400 600 800 10000

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ECAL Ch 3 PMT 4 Raw CountsECAL Ch 3 PMT 4 Raw Counts

0 200 400 600 800 10000

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ECAL Ch 4 PMT 5 Raw CountsECAL Ch 4 PMT 5 Raw Counts

0 200 400 600 800 10000

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3500

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ECAL Ch 5 PMT 6 Raw CountsECAL Ch 5 PMT 6 Raw Counts

0 200 400 600 800 10000

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3500

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ECAL Ch 6 PMT 7 Raw CountsECAL Ch 6 PMT 7 Raw Counts

0 200 400 600 800 10000

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3500

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ECAL Ch 7 PMT 8 Raw CountsECAL Ch 7 PMT 8 Raw Counts

0 200 400 600 800 10000

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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