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 efficiency, resolution performance evaluation in beam test • tracking by telescope telescope • detector detector 2

telescope telescope detector • decide incident position of particle - higher resolution than test detector - SVX4 telescope • compact by hand - strip pitch = 50µm read ADC by analog - resolution ~5µm - my study is to evaluate performance of telescope 3

シンチ シンチ Beam test 2015 CERN • Fermi Lab • ~200GeV/c 2 pion • 120GeV/c 2 pion • test DAQ for pixel • telescope resolution and pixel • detector and telescope efficiency #0 #1 #2 #3 pixel 60cm to evaluate 1m telescope by itself 6 4

decide hit position ADC 1. select biggest ADC count hit each event 2. clustering by charge sharing threshold Q L Q Q R 3. hit position is calculated by x taking center value of ADC d counts. 一番近い strip とヒット位置との距離 clustersize histcluster2_x0 histcluster2_x0 histcluster2_x0 22 Entries Entries 5276 5276 cluster_x0 Mean Mean -0.1114 -0.1114 20 cluster_x0 cluster_x0 RMS RMS 13.88 13.88 Entries Entries 20065 20065 18000 18 Mean Mean 1.127 1.127 RMS RMS 0.3991 0.3991 16000 16 14000 14 12000 12 10 10000 8 8000 6 6000 4 4000 2 2000 0 1 2 0 -50 -40 -30 -20 -10 0 10 20 30 40 50 µm 0 1 2 3 4 5 6 clustersize=2 5

particle Alignment x x,y alignment ‣ y telescope easy alignment by correlation - θ fix one telescope and decide x’ by tracking correlation - tele1x corrrelationx_0_3 from other telescope hit position → tracking corrrelationx_0_3 corrrelationx_0_3 250 250 Entries Entries 46561 46561 Mean x Mean x 162.9 162.9 position - hit position Mean y Mean y 154.2 154.2 RMS x RMS x 38.28 38.28 200 RMS y RMS y 200 37.89 37.89 150 150 θ alignment ‣ 100 100 50 50 slope of - Δ x vs y plot is theta - 0 tele0x 0 0 50 100 150 200 250 track pos - hit pos deltax vs y beforeyvsdeltax0 beforedeltax0 Δ x beforeyvsdeltax0 beforeyvsdeltax0 beforedeltax0 beforedeltax0 Entries Entries 44093 44093 Entries Entries 44093 44093 240 9000 Mean Mean 259.8 259.8 Mean x Mean x 6947 6947 150 220 Mean y Mean y RMS RMS 30.53 30.53 9.08 9.08 8000 RMS x RMS x 2319 2319 200 RMS y RMS y 100 25.99 25.99 7000 180 50 160 6000 140 5000 0 120 4000 100 -50 3000 80 -100 60 2000 40 -150 1000 y µm 20 6 -200 0 0 -100 -50 0 50 100 150 200 250 300 350 400 2000 4000 6000 8000 10000 12000 14000

residual(track position - hit position) telescope0x telescope1x resolution_x0 resolution_x1 resolution_x0 resolution_x0 resolution_x1 resolution_x1 500 Entries Entries 25584 25584 Entries Entries 25510 25510 Mean Mean 8.298 8.298 Mean Mean -7.226 -7.226 500 RMS RMS 19.98 19.98 RMS RMS 19.21 19.21 400 400 300 300 200 200 100 100 0 0 -50 0 50 -50 0 50 µm µm -200 -150 -100 -50 0 50 100 150 200 -200 -150 -100 -50 0 50 100 150 200 telescope2x telescope3x resolution_x3 resolution_x2 resolution_x3 resolution_x3 resolution_x2 resolution_x2 Entries Entries 33692 33692 Entries Entries 33228 33228 Mean Mean 18.53 18.53 450 Mean Mean -16.45 -16.45 RMS RMS 25.57 25.57 RMS RMS 23.83 23.83 500 400 350 400 300 300 250 200 200 150 100 100 50 0 -50 0 50 -200 -150 -100 -50 0 50 100 150 200 0 µm -50 0 50 µm -200 -150 -100 -50 0 50 100 150 200 7

bad alignment tele0 residual each hitmap of peak is different hit[0][0]-track[0][0] • h1 h1 1600 Entries Entries 44093 44093 -8.7 -8.7 Mean Mean 1400 RMS RMS 24.74 24.74 theta alignment is not good…? 1200 • 1000 800 600 400 200 0 -200 -150 -100 -50 0 50 100 150 200 µm center peak left peak right peak hit[0][1]:hit[0][0] {hit[0][0]-track[0][0]<-10 && hit[0][0]-track[0][0]>-20} hit[0][1]:hit[0][0] {hit[0][0]-track[0][0]<-30 && hit[0][0]-track[0][0]>-60} hit[0][1]:hit[0][0] {hit[0][0]-track[0][0]<50 && hit[0][0]-track[0][0]>20} 24 8 hit[0][1] hit[0][1] hit[0][1] 22 12000 12000 12000 30 7 20 18 6 10000 10000 10000 25 16 5 8000 8000 8000 20 14 12 4 6000 6000 6000 15 10 3 8 4000 4000 4000 10 6 2 4 2000 2000 2000 5 1 2 0 0 0 0 0 0 0 2000 4000 6000 8000 10000 12000 0 2000 4000 6000 8000 10000 12000 0 2000 4000 6000 8000 10000 12000 hit[0][0] hit[0][0] hit[0][0] 8

bad alignment theta alignment is not good…? • 1. slope is so small ? 
 → but this correction is maybe right 2. iteration is not good ? 
 50µm → xy and theta have to align at the same time residualx vs y µm beforeyvsdeltax0 beforeyvsdeltax0 beforeyvsdeltax0 400 Entries Entries 44093 44093 Mean x Mean x 6944 6944 300 Mean y Mean y 9.111 9.111 RMS x RMS x 2320 2320 RMS y RMS y 38.03 38.03 200 100 0 -100 -200 -300 -400 2000 4000 6000 8000 10000 12000 14000 µm 9

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 hitmap0 hitmap0 hitmap0 Entries 51393 Entries 51393 1 12000 Mean x 8174 Mean x 8174 10 Mean y 6326 Mean y 6326 RMS x 1916 RMS x 1916 1 10000 RMS y 2754 RMS y 2754 8 8000 6 6000 4 4000 2 2000 0 0 0 2000 4000 6000 8000 1000012000 corrrelationx_0_3 adc[0][1][50] corrrelationx_0_3 corrrelationx_0_3 htemp htemp 250 250 5 201063 201063 Entries Entries 46561 46561 Entries Entries 10 60.55 60.55 Mean x Mean x 162.9 162.9 Mean Mean RMS RMS 5.36 5.36 Mean y Mean y 154.2 154.2 RMS x RMS x 38.28 38.28 4 200 10 200 RMS y RMS y 37.89 37.89 3 10 150 150 2 10 100 100 10 50 50 1 0 50 100 150 200 250 adc[0][1][50] 0 0 0 50 100 150 200 250 12

一本の strip 模式図 beforeyvsdeltax2 beforeyvsdeltax2 beforeyvsdeltax2 400 Entries Entries 44093 44093 Mean x Mean x 7084 7084 300 Mean y Mean y -16.14 -16.14 RMS x RMS x 2318 2318 RMS y RMS y 38.26 38.26 200 100 0 -100 -200 -300 -400 2000 4000 6000 8000 10000 12000 14000 13

make slope big by hand telescope0x telescope1x deltax0 deltax1 deltax0 deltax0 deltax1 deltax1 Entries Entries 44093 44093 Entries Entries 44093 44093 450 400 Mean Mean -1.695 -1.695 Mean Mean -1.655 -1.655 RMS RMS 57.27 57.27 RMS RMS 57.45 57.45 400 350 350 300 300 250 250 200 200 150 150 100 100 50 50 0 0 µm µm -100 0 100 -100 0 100 -400 -300 -200 -100 0 100 200 300 400 500 -400 -300 -200 -100 0 100 200 300 400 500 telescope2x telescope3x deltax2 deltax3 deltax2 deltax2 deltax3 deltax3 250 Entries Entries 44093 44093 Entries Entries 44093 44093 Mean Mean 37.17 37.17 220 Mean Mean -41.35 -41.35 RMS RMS 95.55 95.55 RMS RMS 98.98 98.98 200 200 180 160 140 150 120 100 100 80 60 50 40 20 0 0 µm µm -100 0 100 -100 0 100 -400 -300 -200 -100 0 100 200 300 400 500 -400 -300 -200 -100 0 100 200 300 400 500 14

improve charge sharing use events of cluster size =2 in CERN beam test • track by other telescopes pass channel ADC max ±25µm • chargesharing_maxadc chargesharing_maxadc chargesharing_maxadc_pfx chargesharing_maxadc_pfx chargesharing_maxadc chargesharing_maxadc 1.8 Entries Entries 5916 5916 Entries Entries 5916 5916 220 Mean Mean -0.3695 -0.3695 Mean x Mean x -0.3695 -0.3695 1.6 Mean y Mean y 200 0.35 0.1528 0.1528 Mean y Mean y 0.1528 0.1528 RMS RMS 11.29 11.29 RMS x RMS x 11.29 11.29 180 1.4 RMS y RMS y 0.1763 0.1763 RMS y RMS y 0.1763 0.1763 0.3 160 1.2 140 1 profile 0.25 120 0.8 100 0.2 0.6 80 0.4 60 0.15 40 0.2 0.1 20 0 0 -25 -20 -15 -10 -5 0 5 10 15 20 25 -25 -20 -15 -10 -5 0 5 10 15 20 25 µm µm 15