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T958-Phase II

T958-Phase II. Fermilab Test beam experiment to study fast timing counters for FP420 UTA, Alberta, Louvain, Fermilab +Saclay, Stony Brook? Data taking planned for Jan/Feb. FP420 Collab meeting CERN Nov. 2, 2006. FINAL SLIDE from Sep. 29 Update. How to Proceed.

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T958-Phase II

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  1. T958-Phase II • Fermilab Test beam experiment to study fast timing counters for FP420 • UTA, Alberta, Louvain, Fermilab +Saclay, Stony Brook? • Data taking planned for Jan/Feb FP420 Collab meeting CERN Nov. 2, 2006

  2. FINAL SLIDE from Sep. 29 Update How to Proceed • Learned a lot (still learning) but MANY questions have to be answered before we are convinced we have a viable detector • Need better alignment, tracking, electronics, DAQ, analysis, management, etc. • Starting to plan for next test beam (Jan 10?, later?), {some cosmics in mean time?}

  3. 3.7 cm QUARTIC Preprototype side view 9.0 cm 4.7 cm 1.97 cm 2.57 cm 50º 2.54 cm 2.54 cm 2.54 cm top view 7.62 cm 1.01 cm 6.4 cm 1.53 cm top view (photo)

  4. GASTOF Prototype http://www.fynu.ucl.ac.be/themes/he/ggamma/Cherenkov/

  5. Upgrades: Detectors • New QUARTIC prototypes, with two rows of eight bars in new form fitting box, designed and constructed at Fermilab • New GASTOF prototypes, new dimensions, mirrors • Both plan to use new Burle 10 µ tubes (if available—have one, need four)

  6. T958 Electronics (Phase I) Amplifier : Hamamatsu Ortec Phillips Burle 8x8 MCP-PMT ADC (LeCroy 2249A) SMA Lemo Constant Fraction Discriminator Ortec 934 (9307) TDC (Phillips 7186) SMA NIM Trigger, CAMAC DAQ, in parallel tracking with MWPC

  7. Upgrades: Electronics • Louvain is designing a new board to replace the constant fraction discriminators • Alberta is designing a new board to combine the functionality of the amplifiers and CFDs • UTA is working on improving the performance of the Philips TDC • SACLAY might be able to help integrate the HPTDC chip into the readout (VME board) • Fermilab is working on an alternate solution for the TDC’s • The electronics are the limiting factor both in performance and schedule

  8. G1-G2 HV matters: better gain, smaller MCP jitter 2300 Need to optimize threshold+ amplification for each HV 2500

  9. Timing Resolution Components Detector specific: • G~2 ps, Q has other contributions: color dispersion (20 ps), position dependence (25 ps), number of pe’s (25 ps) Common: • PMT (50 psec single pe at max gain;30 for 10 um) • Amplifier/attenuator (actually different) • CFD (not all same) • TDC • CABLES/CONNECTORS (not all same) Need to standardize everything

  10. Tracking tracks projected to Q1 valid time in one Q1 bar y (mm) y (mm) beam “center” 10x15 mm 6 mm 25 mm 15 mm Analysis in progress, improvements planned 30 mm x (mm) x (mm)

  11. Phase I Results (in progress) G2-Q2_53 2300V G2~90 ps Q2~130 (Q2T~110) 2500V G2~65 Expect reduction in Q resolution by √3 (using 3 bars) from 130 to 75, observed ~80 ps; working on algo to use all data (2 issues—minimize individual channel resolution+ minimize overall time resolution)

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