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Tagger microscope beam test results and readiness for construction

GlueX collaboration meeting, Newport News, Oct. 6-8, 2011. Tagger microscope beam test results and readiness for construction. what we learned from construction of the prototype and the parasitic beam tests in Hall B April 2011. Richard Jones , James McIntyre, Alex Barnes, and Igor Senderovich

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Tagger microscope beam test results and readiness for construction

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  1. GlueX collaboration meeting, Newport News, Oct. 6-8, 2011 Tagger microscope beam test results and readiness for construction what we learned from construction of the prototype and the parasitic beam tests in Hall B April 2011 Richard Jones, James McIntyre, Alex Barnes, and Igor Senderovich Alex Somov, Hovanes Egiyan, Jefferson Lab

  2. Outline • Goals • Problems • Microscope prototype results • Revisions to the preamplifier • Completed mechanical design • Outlook for full detector construction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  3. Goals Microscope Prototype • Measure the light yield for a high energy electron moving along the axis of a fiber. • Measure the TDC time resolution achievable using the UConn preamp, leading edge discriminator, F1TDC. • Check the rate dependence (efficiency, time resolution) predicted by our simulation with real data. GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  4. Microscope prototype GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  5. Problems issues that arose during online data collection • trigger counters unable to handle rate > 300 kHz • unsure of precise alignment wrt bend plane • discriminator rates in fibers too low by ~5 • DAQ hangs – fixed by D. Abbott in day 5 ! • ringing in tail of the SiPM pulses from preamp • large cross-talk between channels on preamp • discriminator thresholds were higher than ideal • key electronics channels failed during later runs issues discovered during offline data analysis GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  6. Microscope prototype results A B C D E fiber A1 1 2 3 4 5 4 3 2 1 0 12 13 14 beam’s eye view dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  7. Microscope prototype results A B C D E fiber B1 1 2 3 4 5 4 3 2 1 0 12 13 14 beam’s eye view dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  8. Microscope prototype results A B C D E fiber C1 1 2 3 4 5 4 3 2 1 0 12 13 14 beam’s eye view dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  9. Microscope prototype results A B C D E fiber D1 1 2 3 4 5 4 3 2 1 0 12 13 14 beam’s eye view dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  10. Microscope prototype results A B C D E fiber E1 1 2 3 4 5 4 3 2 1 0 12 13 14 beam’s eye view dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  11. Microscope prototype results A B C D E fiber sum2 1 2 3 4 5 4 3 2 1 0 12 13 14 beam’s eye view dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  12. Microscope light yield estimate • gains were not very well matched (20%) • separate estimates for individual, sum outputs A B C D E 1 2 3 4 5 4 3 2 1 0 12 13 14 individual outputs mean ph = 600 ch FADC gain = 0.27 mV/ch preamp gain = 0.90 mV/pe average = 360 pe/pulse beam’s eye view consistent results systematic error 10% summed outputs mean ph = 550 ch FADC gain = 0.27 mV/ch preamp gain = 0.85 mV/pe average = 350 pe/pulse dispersion direction GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  13. Microscope pulse shape * GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  14. Microscope pulse shape * GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  15. Microscope pulse shape * GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  16. Microscope pulse shape * GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  17. Microscope time resolution Why fiber count rates seemed too low wrt the trigger scint. FADC pulse height discriminator threshold FADC pulse height when TDC fires GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  18. Microscope time resolution In addition to threshold there is also a problem with efficiency FADC pulse height discriminator threshold FADC pulse height when TDC fires GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  19. Microscope time resolution This channel looks better, but it failed and is missing for 80% of the run period. FADC pulse height FADC pulse height when TDC fires discriminator threshold is below the selection cut GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  20. Microscope time resolution Efficiency looks dubious. FADC pulse height FADC pulse height when TDC fires discriminator threshold is here GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  21. Microscope time resolution Efficiency looks dubious. FADC pulse height but Clear threshold, use this one for timing tests. FADC pulse height when TDC fires discriminator threshold is here GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  22. Microscope time resolution 1000 < FADCmax < 1050 GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  23. Microscope time resolution 1100 < FADCmax < 1150 GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  24. Microscope time resolution 1200 < FADCmax < 1250 GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  25. Microscope time resolution 1300 < FADCmax < 1350 GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  26. Microscope time resolution single-channel 4 design goal (threshold 30%) GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  27. Microscope time resolution single-channel 4 summed channel 12 design goal (threshold 30%) GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  28. Preamplifier revisions • Detailed model of preamplifier 1.0 has been written in Matlab • Anomalousfeatures of pulse shapes are reproduced by model. • large cross-talk, slow tail for large pulses • ringing in the tail of pulses • large baseline shifts following each pulse • circuit revisions tested in the model, shown to work • Layout completely redone from scratch • template provided by Fernando • ground flows between long signal traces • better isolation between input and output stages • reduced channel density • impedance matching of outgoing signal traces GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  29. Preamplifier revisions New layout incorporating Hamamatsu SiPM has been entered into Altium. Another round of prototyping is underway, before final circuit is approved. Bench tests will be sufficient to approve the revised design for production. GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  30. e- Beam Tagger Microscope (Top View) Completed mechanical design Tagger Magnet Photon Beam GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  31. Back View Completed mechanical design GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  32. e-View SiFi Bundle Array Parallel Railing System Completed mechanical design GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

  33. Outlook for microscope construction • Major questions regarding performance have been addressed by results of beam test. • All issues found in generation 1 electronics prototypes have been understood and addressed by engineering changes. • One more round of prototyping of electronics is needed, including bench tests at maximum expected pulse rates, before final production can begin. • Mechanical design of microscope is essentially complete. • All elements are now in place for executing a Construction MOU for the tagger microscope. GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

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