Beam Conditioning Monitor ATLAS, LHC Hvard Gjersdal - PowerPoint PPT Presentation

Beam Conditioning Monitor ATLAS, LHC Håvard Gjersdal havard.gjersdal@fys.uio.no EPF, UiO Beam Conditioning Monitor – p. 1

This talk Introduction to the BCM Different setups Analysis Beam Conditioning Monitor – p. 2

BCM 8 modules → 8 channels ± 183 cm from z=0 55mm away from beam pipe Beam Conditioning Monitor – p. 3

Purpose Looking for signs of beam anomalies Beam scraping the TAS collimator, beam-gas interactions Causes background, in worst case damaging the detector Information about the beam Luminosity Interaction point(?) Based on single beam bunch crossings, not integrating the accumulated particle flux. Beam Conditioning Monitor – p. 4

Principle Distinguish between background(TAS, beam-gas) and p-p interactions by time difference p-p interactions: each 25ns Background events: ∆ t = 2∆ z/c ∆ t = 12 . 5 ns when ∆ z ≈ 1 . 90 m Beam Conditioning Monitor – p. 5

Principle Distinguish between background(TAS, beam-gas) and p-p interactions by time difference Beam-gas z < ∆ z , interaction point Beam Conditioning Monitor – p. 6

pCVD diamond polycrystalline Chemical Vapor Deposition(pCVD) diamond Radiation hard Fast and short signal, important for high speed enviroment Very low leakage current 1 cm × 1 cm × 500 µm 2 diamonds back to back at 45 ◦ to improve SNR Beam Conditioning Monitor – p. 7

Front-end Operated at ± 1000V → High and narrow current pulse Two stage Fotec amplifier Beam Conditioning Monitor – p. 8

Back-end NINO amplifier-discriminator Adjustable threshold ∼ 15m coax-cable FPGA Field-programmable gate array Programmable logic components ∼ 100m optical fiber Beam Conditioning Monitor – p. 9

Test beam setup Beam Conditioning Monitor – p. 10

Position scan, analog, H6 Ch0:Trigger → ADC(CAEN V1729) Ch1: Fotec → Ampl.(ORTEC FTA820) → Discr.(ORTEC QUAD CFD) → ADC Ch2: Fotec → Ampl.(ORTEC FTA820) → Discr.(ORTEC QUAD CFD) → ADC Ch3 : Empty Beam Conditioning Monitor – p. 11

Prevessin Beam Conditioning Monitor – p. 12

Single event stm0 stm0 stm1 stm1 event8 CH0 event8 CH1 Entries Entries 1263 1270 Entries Entries 1270 1263 Mean Mean 178.5 178.5 900 Mean Mean 161.8 142.3 RMS RMS 30.43 30.13 RMS RMS 87.08 80.3 2000 800 1500 700 1000 600 500 500 400 0 300 -500 200 -1000 100 -1500 0 -2000 0 50 100 150 200 250 300 0 50 100 150 200 250 300 event8 CH2 stm2 stm2 event8 CH3 stm3 stm3 Entries Entries 1263 1270 Entries Entries 1263 1270 Mean Mean 154.7 139.1 Mean Mean 166.3 173.5 250 RMS RMS 88.76 76.95 RMS RMS 92.25 86.32 120 200 100 80 150 60 100 40 50 20 0 0 -50 -20 0 50 100 150 200 250 300 0 50 100 150 200 250 300 Beam Conditioning Monitor – p. 13

All event histCh0 histCh0 histCh1 histCh1 Ch:0 Events:10001 Ch:1 Events:10001 Entries Entries 6303974 6303974 Entries Entries 6303974 6303974 Mean Mean 178.4 178.4 Mean Mean 128.6 128.6 1500 500 RMS RMS 30.3 30.3 RMS RMS 61.04 61.04 1000 400 500 0 300 -500 200 -1000 100 -1500 0 -2000 50 100 150 200 250 300 50 100 150 200 250 300 Ch:2 Events:10001 histCh2 histCh2 Ch:3 Events:10001 histCh3 histCh3 Entries Entries 6303974 6303974 Entries Entries 6303974 6303974 350 Mean Mean 125.9 125.9 Mean Mean 144.5 144.5 2 300 RMS RMS 45.5 45.5 RMS RMS 90.83 90.83 1 250 0 200 150 -1 100 -2 50 -3 0 -4 50 100 150 200 250 300 50 100 150 200 250 300 Beam Conditioning Monitor – p. 14

Signal peak signalCh0 signalCh0 signalCh1 signalCh1 signalCh0 signalCh1 Entries Entries 10001 10001 Entries Entries 10001 10001 Mean Mean 11.1 11.1 Mean Mean 566.3 566.3 RMS RMS 1.266 1.266 RMS RMS 282 282 140 8000 χ χ 2 2 / ndf / ndf 9987 / 0 9987 / 0 χ χ 2 2 / ndf / ndf 532.4 / 436 532.4 / 436 Width Width 100 100 67.1 67.1 Width Width 44.55 44.55 1.26 1.26 ± ± ± ± 120 7000 MP MP 247.6 247.6 ± ± 23.2 23.2 408.5 408.5 ± ± 1.7 1.7 MP MP Area Area 1e+04 1e+04 11616 11616 Area Area 4.015e+04 4.015e+04 420 420 ± ± ± ± 6000 GSigma GSigma 100 GSigma GSigma 100 100 ± ± 63.6 63.6 74.65 74.65 ± ± 2.22 2.22 5000 80 4000 60 3000 40 2000 20 1000 0 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 200 400 600 800 1000 1200 1400 1600 1800 2000 signalCh2 signalCh2 signalCh2 signalCh3 signalCh3 signalCh3 Entries Entries 10001 10001 Entries Entries 10001 10001 Mean Mean 384.5 384.5 Mean Mean 4.96 4.96 8000 RMS RMS 229.2 229.2 RMS RMS 17.35 17.35 180 2 2 / ndf / ndf 416.5 / 371 416.5 / 371 χ χ 2 2 / ndf / ndf 9961 / 10 9961 / 10 χ χ 7000 160 Width Width 26.53 26.53 0.89 0.89 ± ± Width Width 100 100 ± ± 49.3 49.3 277.2 277.2 ± ± 1.5 1.5 MP MP 435.9 435.9 ± ± 24.7 24.7 MP MP 6000 140 Area Area 4.093e+04 4.093e+04 422 422 Area Area 1e+04 1e+04 ± ± 5025 5025 ± ± GSigma GSigma 74.2 74.2 1.6 1.6 GSigma GSigma ± ± 100 100 ± ± 11.5 11.5 120 5000 100 4000 80 3000 60 2000 40 1000 20 0 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Beam Conditioning Monitor – p. 15

Signal Delay signalDelayCh0 signalDelayCh0 signalDelayCh0 signalDelayCh1 signalDelayCh1 signalDelayCh1 Entries Entries 19906 19906 Entries Entries 11928 11928 3000 1 Mean Mean 0 0 Mean Mean 92.82 92.82 RMS RMS 0 0 RMS RMS 2.4 2.4 2500 0.8 2000 0.6 1500 0.4 1000 0.2 500 0 0 85 90 95 100 105 110 115 85 90 95 100 105 110 115 signalDelayCh2 signalDelayCh3 signalDelayCh2 signalDelayCh2 signalDelayCh3 signalDelayCh3 Entries Entries 14196 14196 Entries Entries 313 313 2 Mean Mean 93.64 93.64 Mean 97.68 Mean 97.68 2500 RMS RMS 2.866 2.866 1.8 RMS 10.12 RMS 10.12 1.6 2000 1.4 1.2 1500 1 0.8 1000 0.6 0.4 500 0.2 0 0 85 90 95 100 105 110 115 85 90 95 100 105 110 115 Beam Conditioning Monitor – p. 16

Noise noiseCh0 noiseCh0 noiseCh1 noiseCh1 noiseCh0 noiseCh1 Entries Entries 10001 10001 Entries Entries 10001 10001 Mean Mean 4.706 4.706 Mean Mean 0.9121 0.9121 6000 RMS RMS 1.527 1.527 RMS RMS 19.49 19.49 χ χ 2 2 / ndf / ndf 119.5 / 7 119.5 / 7 χ χ 2 2 / ndf / ndf 1319 / 93 1319 / 93 500 Constant Constant 526.6 526.6 7.3 7.3 Constant Constant 6025 6025 ± ± 72.3 72.3 ± ± 5000 Mean Mean 5.296 5.296 ± ± 0.013 0.013 Mean Mean -2.16 -2.16 ± ± 0.20 0.20 Sigma Sigma Sigma Sigma 1.308 1.308 0.009 0.009 13.13 13.13 ± ± 0.12 0.12 ± ± 400 4000 300 3000 200 2000 100 1000 0 0 -200 -150 -100 -50 0 50 100 150 200 -60 -40 -20 0 20 40 60 80 100 120 noiseCh2 noiseCh2 noiseCh2 noiseCh3 noiseCh3 noiseCh3 Entries Entries 10001 10001 Entries Entries 10001 10001 Mean Mean 1.263 1.263 Mean Mean -1.458 -1.458 RMS RMS 28.36 28.36 RMS RMS 5.888 5.888 1400 350 χ χ 2 2 / ndf / ndf 1484 / 112 1484 / 112 χ χ / ndf / ndf 1665 / 28 1665 / 28 2 2 Constant Constant 323.3 323.3 5.1 5.1 1412 1412 19.1 19.1 ± ± Constant Constant ± ± 300 Mean Mean -2.266 -2.266 ± ± 0.368 0.368 1200 Mean Mean -0.7351 -0.7351 ± ± 0.0687 0.0687 Sigma Sigma 21.05 21.05 ± ± 0.24 0.24 Sigma Sigma 4.71 4.71 ± ± 0.04 0.04 1000 250 200 800 150 600 100 400 50 200 0 0 -60 -40 -20 0 20 40 60 80 100 120 140 -200 -150 -100 -50 0 50 100 150 200 Beam Conditioning Monitor – p. 17

Noise noiseCh0 noiseCh0 noiseCh1 noiseCh1 noiseCh0 noiseCh1 Entries Entries 10001 10001 Entries Entries 10001 10001 Mean -0.5574 Mean -0.5574 Mean Mean -4.453 -4.453 450 RMS RMS 1.66 1.66 RMS RMS 24.58 24.58 4500 400 4000 350 3500 300 3000 250 2500 200 2000 150 1500 100 1000 50 500 0 0 -200 -150 -100 -50 0 50 100 150 200 -200 -150 -100 -50 0 50 100 150 200 noiseCh2 noiseCh2 noiseCh2 noiseCh3 noiseCh3 noiseCh3 Entries Entries 10001 10001 Entries Entries 10001 10001 Mean Mean -4.854 -4.854 2500 Mean Mean 1.639 1.639 RMS RMS 31.77 31.77 RMS RMS 5.244 5.244 300 2000 250 1500 200 150 1000 100 500 50 0 0 -200 -150 -100 -50 0 50 100 150 200 -200 -150 -100 -50 0 50 100 150 200 Beam Conditioning Monitor – p. 18

Noise, high stat noiseCh1 noiseCh1 noiseCh1 Entries 6.0006e+07 Entries 6.0006e+07 Mean Mean 1.138 1.138 RMS RMS 19.9 19.9 6 10 5 10 4 10 3 10 2 10 -100 -50 0 50 100 150 200 250 300 Beam Conditioning Monitor – p. 19

Noise, Fotec Beam Conditioning Monitor – p. 20