1. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 1 ATLAS MDT-ASD Operational Tests at Harvard George Brandenburg Michelle Dolinski Peter Hurst Matt Nudell John Oliver

2. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 2 Test Setup Overview Octal Mezz Boards (latest rev) with 3 ASDs each –16 4x6 boards mounted on an MDT chamber –16 3x8 boards with input terminators added –96 ASDs total Connected to CSM-0 via: –Adapterinos to convert to Mezz Lite cables –Eighteen channel adapter to convert to RJ45 cables Readout by PC running MiniDAQ –Special version from Jeff Gregory - UMich –Auto run sweeps over threshold and/or injection mask

3. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 3 ASD Threshold Sweeps Noise runs (no input signal) with threshold varied –Range: -50mv to +50mv in 2mv steps –Nominal running threshold is -60mv Fit observed peak to Gaussian distribution Center (offset) determines threshold stability –Large offsets --> hot (or cold) channels –See John Oliver talk for discussion Sigma is measure of channel noise –Average over all channels is 6mv –Running with -60mv threshold --> very quiet!

4. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 4 Thresh Sweep Raw Data I Mezz Board 434-01 (4x6)

5. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 5 Thresh Sweep Raw Data II Mezz Board 434-01 (4x6)

6. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 6 Thresh Sweep Gaussian Fits Mezz Board 434-01 (4x6)

7. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 7 Offset Summary (see John Oliver talk for yield estimate)

8. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 8 Gaussian Sigma Summary

9. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 9 Charge Injection Sweeps Charge injection runs (signal approx. 300mv) Utilize ASD internal injection circuit and mask Sweep runs with injection mask varied –First run has no channel injected –Next 24 runs have successive channels injected 10K event runs: 100% efficiency and no cross-talk Subtle (software?) effect seen: –Some hits occasionally migrate to neighboring bin –Not an ASD effect - DAQ buffer not cleared at run start One bad channel seen out of 96x8 = 768

10. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 10 Injection Sweep Raw Data Mezz Board 434-01 (4x6) ASD 1ASD 2ASD 3 Note migration from ASD 3 Ch16 to ASD2 Ch15 --> NOT an ASD effect!

11. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 11 Injection Sweep Raw Data Mezz Board 444-05 (4x6) ASD 1ASD 2ASD 3 Note migration is to the right with reverse sweep --> Event buffer from previous run not cleared!

12. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 12 MDT-ASD Test Summary Noise Run Threshold Sweeps –Threshold Offset distribution has Sigma = 4.5 mv –--> 90% yield with QC cut at 10 mv spread per chip –Threshold Sweep Gaussian Sigma average = 6 mv –--> very quiet running at nominal threshold of -60 mv Charge Injection Channel Sweeps –100% efficient with signal 5 x threshold (~300 mv) –No channel cross-talk observed in 10K event runs

13. ATLAS MDT-ASD PRR – 30-August-2002George Brandenburg – Page 13 Production Schedule - 6/02