ProtoDUNE Dual Phase light data analysis Ana Gallego Ros November - - PowerPoint PPT Presentation

SLIDE 1

ProtoDUNE Dual Phase light data analysis

Ana Gallego Ros November 2019

SLIDE 2

✦ PMT calibration status ✦ Alternative LCS ✦ S1 characterization

Contents

2

SLIDE 3

PMT calibration status

SLIDE 4

# Runs Date Person/people taking data #Ev LEDs LED connected to top fibers? #PMTs HV range Crosstalks? W (us) 1 510-533 30/07/2019 Ana 20k 1-6 (separate) NO 36 Customized NO 1.2 2 862-897 03/09/2019 Daniel 20k 1-6 (separate) NO 36 1100-1500 V (75 V steps) NO 1.2 3 950-956 11/09/2019 Antonio/Inés 20k 1-6 (same time) NO 36 1500-1700 V (50 V steps) NO 1.2 4 1006-1013 12/09/2019 Antonio/Inés 20k 1-6 (same time) NO 36 1500-1750 V (50 V steps) NO 1.2 5 1284-1291 03/10/2019 Carmen/Diana 20k 2,3,4,5 (same time) YES 24 1400-1750 V (50 V steps) NO 1 07/10/2019 —> Change of the trigger inputs (black box from trigger-in to ADC channel #53) 6 1367-1373 08/10/2019 Daniel/Ana 20k 2,3,4,5 (same time) YES 24 1450-1750V (50 V steps) YES 1 7 1637-1644 21/10/2019 Diana 20k 1-6 (same time) NO 32 1450-1750V (50 V steps) YES 1 8 1669-1676 29/10/2019 Ana 50k 1-6 (same time) NO 32 1450-1750V (50 V steps) YES 1 30/10/2019 —> LCS trigger done with SiPM (ch#55) & black box is disconnected 9 1700-1707 30/10/2019 Diana/Ana 20k 1-6 (same time) NO 32 1450-1750V (50 V steps) ~NO 1 10 1779-1786 05/11/2019 Daniel 20k 1-6 (same time) NO 32 1450-1750V (50 V steps) ~NO 1

Gain vs High Voltage

4

* Black: done * Red: to do * Orange: ongoing

SLIDE 5

Gain stability (from G vs HV measurements)

5

✦ Comments:

• Plan: recover the previous trigger

configuration (black box)

• Attenuate the trigger signal (hardware) to

mitigate/eliminate the crosstalks

• The PMT HVs have been tuned several

times to keep the gain constant:

• Initial values (CIEMAT)
• 17/07 (v1720, first calibration at CT)
• 30/07 (first calibration w/ v1740)
• 12/09
• 05/11 (>20% of G variation)

01/09/19 01/11/19 at fixed HV

36

<Gain> 2 4 6 8 10 12

6

10 ×

20190730 20190903 20190911 20190912 20191003 20191105 20190730 20190903 20190911 20190912 20191003 20191105 20190730 20190903 20190911 20190912 20191003 20191105 20190730 20190903 20190911 20190912 20191003 20191105 20190730 20190903 20190911 20190912 20191003 20191105 20190730 20190903 20190911 20190912 20191003 20191105

• - - first calibration (20190717)

11/09/19 11/10/19 10/11/19 Gain at fixed HV 8.5 9 9.5 10 10.5 11

6

10 ×

FA0129 FA0132 FA0148 FA0155 FA0129 FA0132 FA0148 FA0155 FA0129 FA0132 FA0148 FA0155 FA0129 FA0132 FA0148 FA0155

4 PMTs

✦ Average gain ~36 PMTs at the HV for 1e7 obtained in first calibration in LAr (20190717) ✦ There is a big dispersion among PMTs! (large error bars)

Find a better way of showing these results!

SLIDE 6

Alternative LCS

SLIDE 7

7

✦ Alternative LCS:

• Goal: calibration with

diffuse light from the top of the detector

• System based on 2
• ptical fibers at the top
• This option reduces the

number of fibers

Alternative LCS layout

SLIDE 8

8

PMT calibration with top fibers

Crosstalks since 07/10!

✦ Other runs were taken before but they were not “good ones”: PMT gain was too low, time window was too long, waveforms were too affected by crosstalks… we learnt from them! ✦ Runs #1382-1384 give us an idea of the performance of the system ✦ Results from run #1383 (next slide) show that 29/32 PMTs can be calibrated (*ΔG = -12±11%) using the alternative LCS with LEDs at maximum power (19.5 V)

* Comparison with regular PMT calibration (03/10/2019) —> table!

#Run Date Measurement LED LED voltage (V) Target PMT gain (20190912) 1382 09/10 Gain stability 1 (top left) 19.5 1E+08 1383 09/10 Gain stability 4 (top right) 19.5 1E+08 1384 09/10 Gain stability 1 & 4 (top both sides) 19.5 1E+08

SN Expected gain Obtained gain ΔG (%) FA0104 9.16E+07 8.21E+07

• 10

FA0105 8.91E+07 6.67E+07

• 25

FA0107 1.02E+08 9.41E+07

• 8

FA0110 1.02E+08 8.93E+07

• 12

FA0112 1.01E+08 9.05E+07

• 11

FA0114 1.01E+08 8.67E+07

• 14

FA0116 9.36E+07 7.9E+07

• 16

FA0122 1.01E+08 8.79E+07

• 13

FA0124 7.82E+07 8.84E+07 13 FA0129 1.00E+08 8.37E+07

• 16

FA0130 1.03E+08 8.95E+07

• 13

FA0132 1.03E+08 8.44E+07

• 18

FA0135 1.02E+08 7.62E+07

• 25

FA0139 9.91E+07 9.51E+07

• 4

FA0148 9.68E+07 8.84E+07

• 9

FA0149 9.3E+07 7.89E+07

• 15

FA0151 9.88E+07 1.04E+08 6 FA0153 9.77E+07 1.02E+08 4 FA0155 9.65E+07 8.19E+07

• 15

FC0004 1.01E+08 8.43E+07

• 16

FC0005 1.05E+08 6.65E+07

• 37

SLIDE 9 Q (|e|) 50 100 150 200 6 10 × Entries 1 10 2 10 3 10 FA0146, ADC ch #0, LED #4 (top fiber #1) Gain = 7.68e+07 Q (|e|) 50 100 150 200 250 300 6 10 × Entries 1 10 2 10 3 10 FA0136, ADC ch #16, LED #4 (top fiber #1) Gain = 9.16e+07 Q (|e|) 20 − 15 − 10 − 5 − 5 6 10 × Entries 1 10 2 10 3 10 FA0147, ADC ch #17, LED #4 (top fiber #1) Q (|e|) 100 200 300 400 6 10 × Entries 1 10 2 10 FA0113, ADC ch #40, LED #4 (top fiber #1) Gain = 1.04e+08 Q (|e|) 50 100 150 200 6 10 × Entries 1 10 2 10 3 10 FA0121, ADC ch #1, LED #4 (top fiber #1) Gain = 8.77e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0115, ADC ch #8, LED #4 (top fiber #1) Gain = 9.03e+07 Q (|e|) 50 100 150 200 250 300 350 400 450 6 10 × Entries 1 10 2 10 FA0150, ADC ch #32, LED #4 (top fiber #1) Gain = 9.99e+07 Q (|e|) 20 − 15 − 10 − 5 − 5 10 15 6 10 × Entries 1 10 2 10 3 10 FA0156, ADC ch #41, LED #4 (top fiber #1) Q (|e|) 15 − 10 − 5 − 5 10 15 6 10 × Entries 1 10 2 10 3 10 FA0119, ADC ch #2, LED #4 (top fiber #1) Q (|e|) 15 − 10 − 5 − 5 10 15 6 10 × Entries 10 2 10 3 10 FA0106, ADC ch #18, LED #4 (top fiber #1) Q (|e|) 50 100 150 200 250 300 6 10 × Entries 1 10 2 10 FA0111, ADC ch #19, LED #4 (top fiber #1) Gain = 5.33e+07 Q (|e|) 200 400 600 800 6 10 × Entries 1 10 FA0133, ADC ch #42, LED #4 (top fiber #1) Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0114, ADC ch #3, LED #4 (top fiber #1) Gain = 8.67e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0148, ADC ch #4, LED #4 (top fiber #1) Gain = 8.84e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0110, ADC ch #9, LED #4 (top fiber #1) Gain = 8.93e+07 Q (|e|) 50 100 150 200 250 300 6 10 × Entries 1 10 2 10 3 10 FA0132, ADC ch #20, LED #4 (top fiber #1) Gain = 8.44e+07 Q (|e|) 50 100 150 200 250 300 350 400 6 10 × Entries 1 10 2 10 3 10 FA0139, ADC ch #21, LED #4 (top fiber #1) Gain = 9.51e+07 Q (|e|) 100 200 300 400 500 6 10 × Entries 1 10 2 10 FA0107, ADC ch #33, LED #4 (top fiber #1) Gain = 9.41e+07 Q (|e|) 100 200 300 400 500 600 6 10 × Entries 1 10 2 10 FA0151, ADC ch #43, LED #4 (top fiber #1) Gain = 1.04e+08 Q (|e|) 100 200 300 400 500 600 700 800 900 6 10 × Entries 1 10 FA0137, ADC ch #44, LED #4 (top fiber #1) Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0135, ADC ch #5, LED #4 (top fiber #1) Gain = 7.62e+07 Q (|e|) 50 100 150 200 6 10 × Entries 1 10 2 10 3 10 FA0124, ADC ch #10, LED #4 (top fiber #1) Gain = 8.84e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0130, ADC ch #22, LED #4 (top fiber #1) Gain = 8.95e+07 Q (|e|) 50 100 150 200 250 300 6 10 × Entries 1 10 2 10 3 10 FA0104, ADC ch #23, LED #4 (top fiber #1) Gain = 8.21e+07 Q (|e|) 50 100 150 200 250 300 350 400 450 6 10 × Entries 1 10 2 10 FA0153, ADC ch #34, LED #4 (top fiber #1) Gain = 1.02e+08 Q (|e|) 100 200 300 400 500 600 700 6 10 × Entries 1 10 2 10 FA0134, ADC ch #45, LED #4 (top fiber #1) Q (|e|) 20 40 60 80 100 120 140 160 180 6 10 × Entries 1 10 2 10 3 10 FC0005, ADC ch #6, LED #4 (top fiber #1) Gain = 6.65e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0155, ADC ch #11, LED #4 (top fiber #1) Gain = 8.19e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0129, ADC ch #35, LED #4 (top fiber #1) Gain = 8.37e+07 Q (|e|) 50 100 150 200 250 300 350 400 6 10 × Entries 1 10 2 10 3 10 FA0112, ADC ch #46, LED #4 (top fiber #1) Gain = 9.05e+07 Q (|e|) 50 100 150 200 6 10 × Entries 1 10 2 10 3 10 FC0004, ADC ch #7, LED #4 (top fiber #1) Gain = 8.43e+07 Q (|e|) 50 100 150 200 6 10 × Entries 1 10 2 10 3 10 FA0149, ADC ch #12, LED #4 (top fiber #1) Gain = 7.89e+07 Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0116, ADC ch #36, LED #4 (top fiber #1) Gain = 7.90e+07 Q (|e|) 50 100 150 200 250 300 350 400 450 6 10 × Entries 1 10 2 10 3 10 FA0157, ADC ch #47, LED #4 (top fiber #1) Q (|e|) 50 100 150 200 250 6 10 × Entries 1 10 2 10 3 10 FA0122, ADC ch #13, LED #4 (top fiber #1) Gain = 8.79e+07 Q (|e|) 50 100 150 200 6 10 × Entries 1 10 2 10 3 10 FA0105, ADC ch #37, LED #4 (top fiber #1) Gain = 6.67e+07

9

Run #1383, Oct 9, grids @ 6.5 kV

✦ LED #4 (fiber #1) ✦ 19.5 V ✦ PMTs @ 1e8 ✦ 29/32 PMTs ✔ ✦ 3/32 PMTs ✘

+ +

ped* ped* ped* ped* * Oscilloscope PMTs

+

best result

crosstalks! SPE SPE fixed

SLIDE 10

10

Top fibers: summary

✦ Best result:

• Run #1383
• LED #4 (fiber #1) @ 19.5 V
• PMTs @ 1e8
• 29 / 32 PMTs can be calibrated
• 3 PMTs see too much light —> lower LED voltage next time

✦ Plan (36 PMTs):

• Reconnect the 4 oscilloscope PMTs to ADC
• Connect one LED to the top fiber #1 (right one) and calibrate in the previous conditions
• Do a scan on the LED voltage to calibrate all the PMTs
• Recover the baseline configuration and perform regular calibration right after to compare
• Take also G vs HV curves

SLIDE 11

S1 characterization

SLIDE 12

12

S1 signal: peak counting

PEN TPB

example

5 ADC 7-10 ADC 10 ADC

SPE amplitude (G = 1.5e7)

✦ S1 identification algorithm:

• pedestal = 20 first samples with ped_RMS<3 ADC
• amplitude = pedestal - minimum
• S1 signal if amplitude > 20 ADC
• If S1 is found, the 16 us window after it is ignored!

Pedestal RMS (ADC) 0.5 1 1.5 2 2.5 3 Events 20 40 60 80 100 120 140 160 FA0104 FA0130 FA0132 FA0139

Event 18 --> S1 signal! Time: 328.448 us; Amplitude: 47.25 ADC; Charge: 1.74099e+08 (e) Event 18 --> S1 signal! Time: 462.72 us; Amplitude: 145.25 ADC; Charge: 4.63776e+08 (e) Event 18 --> S1 signal! Time: 844.976 us; Amplitude: 292.25 ADC; Charge: 1.05483e+09 (e) Event 18 --> S1 signal! Time: 941.696 us; Amplitude: 27.25 ADC; Charge: 7.65645e+07 (e)

✔

✦ Run 1625 (18/10/2019)

• Random trigger
• 30k events (250 subruns)
• Only 1.3k events proccessed!
• Fields off
• Time window: 1 ms
• Sampling: 16 ns
• PMTs at G=1e7 (20190912)

SLIDE 13

13

S1 signal: rate vs amplitude

(next step: SPE rate)

Amplitude (ADC) 0.5 1 1.5 2 2.5 3 3.5

3

10 × Rate (Hz) 10

2

10

3

10

4

10 FA0104 FA0130 FA0132 FA0139

Amplitude (ADC) 20 40 60 80 100 120 Rate (Hz) 3 10 4 10 FA0104 FA0130 FA0132 FA0139

ZOOM

✦ S1 rate = #S1 signals / effective time ✦ effective time = (time window x #events) - (#S1 signals x 16 us) ✦ Results:

• TPB PMT: S1 rate ~ 15-20 kHz
• PEN PMT: S1 rate ~ 4-6 kHz

> !

PEN TPB

✦ Run 1625 (18/10/2019)

• Random trigger
• 30k events (250 subruns)
• Only 1.3k events proccessed!
• Fields off
• Time window: 1 ms
• Sampling: 16 ns
• PMTs at G=1e7 (20190912)

SLIDE 14

Charge (e) 5 10 15 20 25 30

9

10 × Amplitude (ADC) 0.5 1 1.5 2 2.5 3 3.5 4

3

10 × 0.5 1 1.5 2 2.5 3 3.5

3

10 ×

FA0130

Charge (e) 5 10 15 20 25 30

9

10 × Amplitude (ADC) 0.5 1 1.5 2 2.5 3 3.5 4

3

10 × 0.5 1 1.5 2 2.5 3 3.5 4 4.5

3

10 ×

FA0139

Charge (e) 5 10 15 20 25 30

9

10 × Amplitude (ADC) 0.5 1 1.5 2 2.5 3 3.5 4

3

10 × 0.5 1 1.5 2 2.5 3 3.5 4 4.5

3

10 ×

FA0132

Charge (e) 5 10 15 20 25 30

9

10 × Amplitude (ADC) 0.5 1 1.5 2 2.5 3 3.5 4

3

10 × 0.5 1 1.5 2 2.5 3 3.5 4

3

10 ×

FA0104

ADC saturation!

PEN PEN TPB TPB

ADC saturation! ADC saturation!

14

S1 signal: amplitude vs charge

PEN TPB

x109 x109 x109 x109

✦ Run 1625 (18/10/2019)

• Random trigger
• 30k events (250 subruns)
• Only 1.3k events proccessed!
• Fields off
• Time window: 1 ms
• Sampling: 16 ns
• PMTs at G=1e7 (20190912)

Integration window: 96 ns (-2bins,+4bins) = (-32ns,+64ns)

SLIDE 15

15

S1 signal: next steps

✦ Obtain same results with more statistics (30k vs 1.3k) ✦ Analyze other runs (PMT gain = 1e6 to avoid ADC saturation? TPB & PEN equalized in gain?) ✦ Study more PMTs and look for position dependencies (not-centered? corners?) ✦ Characterize the SPE amplitude vs PMT gain in order to define the threshold

SLIDE 16

Backup

SLIDE 17

Runs 1367-1373 (20191008)

400-500 ns? 500-600 ns? 400-500 ns? 400-500 ns? 400-500 ns? 400-500 ns? 500-600 ns? 500-600 ns? 500-600 ns? 500-600 ns? 500-600 ns?

crosstalk!

SPE✓

FA0157

17

SLIDE 18

18

Runs 1700-1707: new configuration

Example! PRELIMINARY