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Optimal Dead Time Reduction Strategy for Data Acquisition Systems in Physics Experiments

This memo outlines strategies to reduce dead time in data acquisition systems for physics experiments, including the proposed plan with specific TDC configurations and timing windows. Recommendations for utilizing MVME 5500 and MVME 6100 CPUs for efficient data transfer are also provided for improved performance.

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Optimal Dead Time Reduction Strategy for Data Acquisition Systems in Physics Experiments

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  1. DAQ deadtime memo Kaz, Grass 2012/01/04

  2. Current dead time Dead time measured on 2011/09/29 • With TDCmax=4, Deadtime =350 us • With TDCmax=8, Deadtime =690 us • With TDCmax=13, Deadtime =1850 us • In our plan, the TDCmax=9 • Dead time < 800us • 1K HZ trigger is fine, however Zero-Suppression fixed the Data transfer dead time.

  3. MVME 5500 6TDC for 2.07 ms • 0.35 ms per TDC • MVME 6100 6TDC for 1.15 ms • 0.19 ms per TDC • MVME5500 increase 76 % of dead time • We should put 5500 in the crates with less TDC

  4. With this plan the Max number of TDC is 9 • The dead time will be 1.72 ms.

  5. 320 ns time window for Chambers • The prop tube still need 640 ns time window, but the max TDC in one ROC will be 4.

  6. Conclusion • 320ns time window -Chambers • 640ns time window – Proptubes • 14 MVME6100 CPUs • Software Zero suppression • The deadtime is 880 us. • For the 6000Hz input cosmic ray test • we can get 913 Hz event rate.

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