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SCT performance from the SR1 endcap data

SCT performance from the SR1 endcap data. - Noise Study -. Satoru Mima Okayama University ID Software Meeting 23-Jan-2007. Contents -Noise Study -. Trigger rate scan Noise threshold scan Edge detection mode On/Off Cabling Summary Online - Sergey Burdin

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SCT performance from the SR1 endcap data

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  1. SCT performance from the SR1 endcap data - Noise Study - Satoru Mima Okayama University ID Software Meeting 23-Jan-2007 ID Software Workshop

  2. Contents -Noise Study - • Trigger rate scan • Noise threshold scan • Edge detection mode On/Off • Cabling • Summary Online - Sergey Burdin Online Monitoring - Martin White Offline - Satoru Mima ID Software Workshop

  3. Noise study - very important issue • Module production phase • SR1 Cosmic ray test • Underground commissioning • Top Left Quadrant of the SCT EC-C 246/247 Modules • Hybrid Temperature ~ 17℃ EndCap-C Compare Barrel vs EC-C • SCT EC modules have 3 main types: • Outer: 56.5–71.8 mm x 123.1 mm • Pitch: 70.8 – 90.3 μm • Middle: 56.1–75.2 mm x 118.7 mm • Pitch: 70.3 – 94.8 μm • Inner: 43.8–55.8 mm x 73.9 mm • Pitch: 54.4 – 69.5 μm Sergey Burdin ID Software Workshop

  4. 1. Trigger Rate Scan EC-C Online Runs 7702 to 7705 were all performed with 1 fC thresholds, but with different trigger rates: The mean and the RMS of the occupancy distribution does not apparently change with trigger rate: The table shows the noise occupancy mean (RMS), scaled by 10E5 Online Monitoring Sergey Burdin Martin White ID Software Workshop

  5. Noise Occupancy of EC-Crun7705(1kHz) vs run7702(100kHz) No trigger rate dependence ID Software Workshop

  6. 2. Noise threshold scan EC-C A plot of noise Occupancy versus threshold. We fit Noise Occupancy with Error Function. All 10kEvent Good fitting result ID Software Workshop

  7. Noise threshold scan EC-C The distribution of Equivalent Noise Charge (ENC) value. ENC (Outer) : 1570 e- (Middle) : 1550 e- (Inner) : 1110 e- separated into Eta (Outer,Middle,Inner). Zoom per chip per module ENC(e-) ID Software Workshop

  8. Comparison of ENC of Barrel and EndCap-C ENC(Barrel) : 1580e- ENC(Outer) : 1570 e- (Middle) : 1550 e- (Inner) : 1110 e- EndCap-C ENC(e-) Same ENC for Barrel and EndCap-C ID Software Workshop

  9. Comparison of ENC for EC-C Module Production SR1 Comic-Ray test ENC(Outer) : 1570 e- (Middle) : 1550 e- (Inner) : 1110 e- Refer to “The ATLAS SemiConductor Tracker End-Cap Module” (2006) NIM Paper My analysis result Only 50-100electron increase in ENC ID Software Workshop

  10. 3. Edge Detection Mode In physics mode the edge detect mode was ON <config>0 3 0 1 0 0 0 0 0 0 1</config> Higher occupancy Sensitive to redundant clock? Online Observed factor 3-4 increase in NO S.Burdin ID Software Workshop

  11. PerAmp+Shaper Readout Buffer Comparator Edge-Detect circuit Sensor Binary Pipeline Test-Input Threshold Voltage Data Compression modes: 00 – Hit 01 – Level 10 – Edge 11 - Test DAC Edge-Detect Enable v Threshold Voltage “Shaped” input pulse to Comparator t Output pulse duration of comparator: Δt ≈ Time-over-threshold of input pulse to comparator “Logic” output of comparator t A. Greenall & J. Vossebeld Δt Δt Increased Occupancy in the Endcap when switching between Edge Mode and Edge Detect • Re-cap of what the Front-End readout looks like: S.Burdin ID Software Workshop

  12. Noise occupancy Edge Detection Mode ON/OFF Run 7757 Edge Detect ON Run7702 Edge Detect OFF Inner Large Mean value And dispersion Middle Outer 0 5E-6 0 5E-6 Noise Occupancy Noise Occupancy

  13. 000 000 001 001 010 010 011 011 100 100 101 101 110 110 111 111 Time bin (Edge Off ) 20KEvent Time bin (Edge On)20KEvent Edge Detection Mode OFF ON Time Bin Time Bin Random, short, much smaller than 40MHz Noise ID Software Workshop

  14. 4. Cabling for EC-C at SR1 Module in Disk 3, Inner side had disappeared. Fixed!  Outer Fixed by Shaun Roe, Sergey Burdin (I use same cosmic run) Middle Missing Disk 3 Inner Disk ID Software Workshop

  15. 5. Summary • No trigger rate dependence (1kHz-100kHz) • ENC=1600e- (spec.<1500e-) for Barrel and EndCap-C (Outer/Middle) • Inner ENC=1100e- (Quiet) • Edge Detection Mode has been analyzed • Observed NO increase in Time bin = 001,010,100. • Cabling map problem fixed -> Looking forward to underground commissioning! ID Software Workshop

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