Performance evaluation of SVX4 telescope 25/12/2016 Yoko YAMAUCHI 1 - - PowerPoint PPT Presentation

Performance evaluation of SVX4 telescope

25/12/2016 Yoko YAMAUCHI

1

ATLAS Silicon detectors

• LHC @ CERN
• upgrade for HL-LHC
• silicon detector : pixel, strip sensor


→developing new sensor for upgrade

2

telescope detector detector

• performance evaluation in beam test
• tracking by telescope

efficiency, resolution

telescope

• telescope detector
• decide incident position of particle
• higher resolution than test detector
• SVX4 telescope
• compact by hand
• read ADC by analog
• resolution ~5µm

3

strip pitch = 50µm

my study is to evaluate performance of telescope

Beam test 2015

4

• CERN
• ~200GeV/c2 pion
• test DAQ for pixel

detector and telescope

• Fermi Lab
• 120GeV/c2 pion
• resolution and pixel

efficiency

6

#0 #1 #2 #3

telescope pixel シンチ シンチ

60cm 1m

to evaluate telescope by itself

decide hit position

5

x d QR QL Q

threshold ADC

• 1. select biggest ADC count hit

each event

• 2. clustering by charge sharing
• 3. hit position is calculated by

taking center value of ADC counts.

histcluster2_x0 Entries 5276 Mean

• 0.1114

RMS 13.88

• 50
• 40
• 30
• 20
• 10

10 20 30 40 50 2 4 6 8 10 12 14 16 18 20 22

histcluster2_x0 Entries 5276 Mean

• 0.1114

RMS 13.88

histcluster2_x0

一番近いstripとヒット位置との距離

µm

cluster_x0 Entries 20065 Mean 1.127 RMS 0.3991

1 2 3 4 5 6 2000 4000 6000 8000 10000 12000 14000 16000 18000

cluster_x0 Entries 20065 Mean 1.127 RMS 0.3991

cluster_x0

clustersize 1 2 clustersize=2

Alignment

6

telescope particle

x y θ

• x,y alignment
• easy alignment by correlation
• fix one telescope and decide x’ by tracking

from other telescope hit position→tracking position - hit position

• θ alignment
• slope of -Δx vs y plot is theta

2000 4000 6000 8000 10000 12000 14000

• 200
• 150
• 100
• 50

50 100 150

beforeyvsdeltax0 Entries 44093 Mean x 6947 Mean y 9.08 RMS x 2319 RMS y 25.99

20 40 60 80 100 120 140 160 180 200 220 240

beforeyvsdeltax0 Entries 44093 Mean x 6947 Mean y 9.08 RMS x 2319 RMS y 25.99

beforeyvsdeltax0

y Δx

beforedeltax0 Entries 44093 Mean 259.8 RMS 30.53

• 100
• 50

50 100 150 200 250 300 350 400 1000 2000 3000 4000 5000 6000 7000 8000 9000

beforedeltax0 Entries 44093 Mean 259.8 RMS 30.53

beforedeltax0

µm

50 100 150 200 250 50 100 150 200 250

corrrelationx_0_3 Entries 46561 Mean x 162.9 Mean y 154.2 RMS x 38.28 RMS y 37.89 50 100 150 200 250 corrrelationx_0_3 Entries 46561 Mean x 162.9 Mean y 154.2 RMS x 38.28 RMS y 37.89

corrrelationx_0_3

tele0x tele1x

correlation track pos - hit pos deltax vs y

residual(track position - hit position)

7

resolution_x0 Entries 25584 Mean 8.298 RMS 19.98

• 200
• 150
• 100
• 50

50 100 150 200 100 200 300 400 500

resolution_x0 Entries 25584 Mean 8.298 RMS 19.98

resolution_x0

resolution_x1 Entries 25510 Mean

• 7.226

RMS 19.21

• 200
• 150
• 100
• 50

50 100 150 200 100 200 300 400 500

resolution_x1 Entries 25510 Mean

• 7.226

RMS 19.21

resolution_x1

resolution_x2 Entries 33228 Mean

• 16.45

RMS 23.83

• 200
• 150
• 100
• 50

50 100 150 200 100 200 300 400 500

resolution_x2 Entries 33228 Mean

• 16.45

RMS 23.83

resolution_x2

resolution_x3 Entries 33692 Mean 18.53 RMS 25.57

• 200
• 150
• 100
• 50

50 100 150 200 50 100 150 200 250 300 350 400 450

resolution_x3 Entries 33692 Mean 18.53 RMS 25.57

resolution_x3

µm µm µm µm

telescope0x telescope1x telescope2x telescope3x

50

• 50

50

• 50

50

• 50

50

• 50

bad alignment

• each hitmap of peak is different
• theta alignment is not good…?

8

h1 Entries 44093 Mean

• 8.7

RMS 24.74

• 200
• 150
• 100
• 50

50 100 150 200 200 400 600 800 1000 1200 1400 1600

h1 Entries 44093 Mean

• 8.7

RMS 24.74

hit[0][0]-track[0][0]

hit[0][0]

2000 4000 6000 8000 10000 12000

hit[0][1]

2000 4000 6000 8000 10000 12000

5 10 15 20 25 30 hit[0][1]:hit[0][0] {hit[0][0]-track[0][0]<-10 && hit[0][0]-track[0][0]>-20} hit[0][0]

2000 4000 6000 8000 10000 12000

hit[0][1]

2000 4000 6000 8000 10000 12000

2 4 6 8 10 12 14 16 18 20 22 24 hit[0][1]:hit[0][0] {hit[0][0]-track[0][0]<-30 && hit[0][0]-track[0][0]>-60} hit[0][0]

2000 4000 6000 8000 10000 12000

hit[0][1]

2000 4000 6000 8000 10000 12000

1 2 3 4 5 6 7 8 hit[0][1]:hit[0][0] {hit[0][0]-track[0][0]<50 && hit[0][0]-track[0][0]>20}

center peak left peak right peak

µm

tele0 residual

bad alignment

• theta alignment is not good…?
• 1. slope is so small ?


→but this correction is maybe right

• 2. iteration is not good ?


→xy and theta have to align at the same time

9

2000 4000 6000 8000 10000 12000 14000

• 400
• 300
• 200
• 100

100 200 300 400

beforeyvsdeltax0 Entries 44093 Mean x 6944 Mean y 9.111 RMS x 2320 RMS y 38.03 beforeyvsdeltax0 Entries 44093 Mean x 6944 Mean y 9.111 RMS x 2320 RMS y 38.03

beforeyvsdeltax0

residualx vs y µm µm

50µm

conclusion

• test telescopes at FermiLab and CERN
• analysis of telescope for testing silicon detector
• alignment is not good…
• now studying how to align x, y and θ at the same time or more

better method

10

Back up

11

test result @FermiLab

12

2000 4000 6000 8000 1000012000 2000 4000 6000 8000 10000 12000

hitmap0

Entries 51393 Mean x 8174 Mean y 6326 RMS x 1916 RMS y 2754

2 4 6 8 10

hitmap0

Entries 51393 Mean x 8174 Mean y 6326 RMS x 1916 RMS y 2754

hitmap0

htemp Entries 201063 Mean 60.55 RMS 5.36 adc[0][1][50]

50 100 150 200 250 1 10

2

10

3

10

4

10

5

10

htemp Entries 201063 Mean 60.55 RMS 5.36

adc[0][1][50]

50 100 150 200 250 50 100 150 200 250

corrrelationx_0_3 Entries 46561 Mean x 162.9 Mean y 154.2 RMS x 38.28 RMS y 37.89

50 100 150 200 250

corrrelationx_0_3 Entries 46561 Mean x 162.9 Mean y 154.2 RMS x 38.28 RMS y 37.89

corrrelationx_0_3

1 1

13

一本のstrip模式図

2000 4000 6000 8000 10000 12000 14000

• 400
• 300
• 200
• 100

100 200 300 400

beforeyvsdeltax2 Entries 44093 Mean x 7084 Mean y

• 16.14

RMS x 2318 RMS y 38.26 beforeyvsdeltax2 Entries 44093 Mean x 7084 Mean y

• 16.14

RMS x 2318 RMS y 38.26

beforeyvsdeltax2

deltax0 Entries 44093 Mean

• 1.695

RMS 57.27

• 400
• 300
• 200
• 100

100 200 300 400 500 50 100 150 200 250 300 350 400 450

deltax0 Entries 44093 Mean

• 1.695

RMS 57.27

deltax0

make slope big by hand

14

deltax1 Entries 44093 Mean

• 1.655

RMS 57.45

• 400
• 300
• 200
• 100

100 200 300 400 500 50 100 150 200 250 300 350 400

deltax1 Entries 44093 Mean

• 1.655

RMS 57.45

deltax1

deltax2 Entries 44093 Mean 37.17 RMS 95.55

• 400
• 300
• 200
• 100

100 200 300 400 500 50 100 150 200 250

deltax2 Entries 44093 Mean 37.17 RMS 95.55

deltax2

deltax3 Entries 44093 Mean

• 41.35

RMS 98.98

• 400
• 300
• 200
• 100

100 200 300 400 500 20 40 60 80 100 120 140 160 180 200 220

deltax3 Entries 44093 Mean

• 41.35

RMS 98.98

deltax3

µm µm µm µm

telescope0x telescope1x telescope2x telescope3x

100

• 100

100

• 100

100

• 100

100

• 100

improve charge sharing

• use events of cluster size =2 in CERN beam test
• track by other telescopes pass channelADC max ±25µm

15

chargesharing_maxadc_pfx

Entries 5916 Mean

• 0.3695

Mean y 0.1528 RMS 11.29 RMS y 0.1763

• 25
• 20
• 15
• 10
• 5

5 10 15 20 25 0.1 0.15 0.2 0.25 0.3 0.35

chargesharing_maxadc_pfx

Entries 5916 Mean

• 0.3695

Mean y 0.1528 RMS 11.29 RMS y 0.1763

chargesharing_maxadc

• 25
• 20
• 15
• 10
• 5

5 10 15 20 25 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 chargesharing_maxadc

Entries 5916 Mean x

• 0.3695

Mean y 0.1528 RMS x 11.29 RMS y 0.1763

20 40 60 80 100 120 140 160 180 200 220 chargesharing_maxadc

Entries 5916 Mean x

• 0.3695

Mean y 0.1528 RMS x 11.29 RMS y 0.1763

chargesharing_maxadc

µm µm profile