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Who am I?

Who am I?. Daniel John Kirby Carnegie Mellon Physics Class of 2013 In Hall A June-July 2012. Task: Implement systems to make FASTBUS readout faster (using CODA). The Goal: Reducing Deadtime. Main Sources of Deadtime Conversion Readout. Mathematical Model. Tasks to Implement.

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Who am I?

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  1. Who am I? Daniel John Kirby Carnegie Mellon Physics Class of 2013 In Hall A June-July 2012

  2. Task: Implement systems to make FASTBUS readout faster (using CODA)

  3. The Goal: Reducing Deadtime Main Sources of Deadtime Conversion Readout

  4. Mathematical Model

  5. Tasks to Implement Multiblock Readout SFI sequencing Event Blocking and Parallel Buffering Module Buffering Sparsification Library Implementation

  6. Sparsification

  7. Event Blocking Illustrated Thanks to Dave Abbott for this idea.

  8. Increasing the Buffer Depth

  9. Parallel Buffering • Split TDC buffer into two distinct buffers. • Readout and trigger acceptance can happen concurrently

  10. Sequential vs. Parallel Buffering

  11. Looking Forward: Parallel Module Buffering Reduces effective trigger rate. Thanks to Igor Rachek for original concept. Thanks to Bryan Moffit for help improving this diagram.

  12. Effect of Module Buffering

  13. Acknowledgements Once again I'd like to extend special thanks to: • BogdanWojtsekhowski • Bryan Moffit • Dave Abbott • Igor Rachek

  14. Physics is COOL! Magnetic Field in Gas Cherenkov Counter By: Austin Milby, Menchville High School, class 2013

  15. Magnetic Field in Gas Cherenkov Counter Introduction Study done by SLAC found that Y-orientation of PMT is most severely affected by magnetic field. WHAT:Shielding of PMT’s from magnetic field generated by BigBite WHY:Magnetic field can cause electrons in PMT to change direction and bend away from dynodes, resulting in skewed data HOW:By implementing a magnetic shielding box for use in the Cherenkov Counter, we can reduce the presence of the magnetic field around the PMT’s which will result in more accurate data Need field to be bellow 1 Gauss!

  16. Detector of the BigBite spectrometer in A1n experiment I am working with magnetic shielding of the PMT for the Gas Cherenkov counter

  17. 7 2 -2 10 5 1 -1 -2.5 -4 (through center of Cherenkov Counter) Bz component, Gauss -100cm 100cm By component, Gauss -100cm 100cm Bx component, Gauss BigBite magnet and the field components Field components are of 5-10 Gauss At PMT the field need to be reduced to the level of 0.5-1 Gauss -100cm 100cm

  18. Center of counter where data on previous slide was obtained Mirror PMT face The layout of the PMTs in the counters Design of Magnetic Shielding Box being considered for use in detector. It will be placed in green area on picture.

  19. (Along surface of PMTs) Bx component, Gauss 100cm -100cm By component, Gauss 100cm -100cm BigBite Magnet and the Field Components (2) Bz component, Gauss (Data taken along purple line) 100cm -100cm

  20. PMT faces Magnetic Shielding Black box outlines location of PMTs in shielding box. NOTE: Data taken with external field of 20 Gauss and current in compensation coil set at 120 amps

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