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ATLAS MDT-ASD Operational Tests at Harvard

ATLAS MDT-ASD Operational Tests at Harvard. George Brandenburg Michelle Dolinski Peter Hurst Matt Nudell John Oliver. 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

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ATLAS MDT-ASD Operational Tests at Harvard

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  1. ATLAS MDT-ASDOperational Tests at Harvard George Brandenburg Michelle Dolinski Peter Hurst Matt Nudell John Oliver George Brandenburg – Page 1

  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 George Brandenburg – Page 2

  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! George Brandenburg – Page 3

  4. Thresh Sweep Raw Data I Mezz Board 434-01 (4x6) George Brandenburg – Page 4

  5. Thresh Sweep Raw Data II Mezz Board 434-01 (4x6) George Brandenburg – Page 5

  6. Thresh Sweep Gaussian Fits Mezz Board 434-01 (4x6) George Brandenburg – Page 6

  7. Offset Summary (see John Oliver talk for yield estimate) George Brandenburg – Page 7

  8. Gaussian Sigma Summary George Brandenburg – Page 8

  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 George Brandenburg – Page 9

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

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

  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 George Brandenburg – Page 12

  13. Production Schedule - 6/02 George Brandenburg – Page 13

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