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Placed in front of BigCal at 240 cm from the target Needed to:

Lucite Cerenkov Hodoscope A. Ahmidouch, S. Danagoulian SANE Readiness Review Meeting, June 26, 2008. Placed in front of BigCal at 240 cm from the target Needed to: Detect charged particles above threshold primarily electrons and pions with high efficiency.

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Placed in front of BigCal at 240 cm from the target Needed to:

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  1. Lucite Cerenkov HodoscopeA. Ahmidouch, S. DanagoulianSANE Readiness Review Meeting, June 26, 2008 Placed in front of BigCal at 240 cm from the target Needed to: Detect charged particles above threshold primarily electrons and pions with high efficiency. 2. Provide useful position resolution at a reasonable cost. 3. Be insensitive to background particles coming from outside of the target chamber

  2. The Lucite hodoscope of 28 detectors is built Picture of the Lucite Hodoscope at the April beam test

  3. SANE Setup Lucite Hodo.

  4. Lucite Cerenkov Hodoscope28BC-800 bars: 3.5 x 6.0 x 96.7--91.5 cm3 curved 6.0 cm 240 cm 3.5 cm

  5. Specs: • 28 Lucite bars: BC-800, 3.5 x 6.0 x 96.7--91.5cm3, n=1.49, Beta_threshold =0.67, propagation of C-light by total Internal reflection. • Curved to 240 cm, Normal incidence from target • Edges cut at 45 deg (avoids reflections) • Light guides (4.9 x 6.0 cm2) to 4.9 cm (circular) • 2” PMTs: Photonis xp2268, 1.5 mm mu-metal cylinder covering PMT+Base+extra 5cm

  6. Hodoscope / Platform (designed by A. Metzger) 28 Lucite bars Mag. Shielding box (0.5” thick)

  7. Magnetic Shielding • The target magnetic field at the Lucite location is < 30 G • Dominating components perpendicular to PMTs • The PMTs are housed in a 1.5 mm mu-metal cylinder covering PMT+Base end extending an extra 5cm to cover the light guide • PMTs are shielded by an iron box 0.5-in thick, which reduces the field to a few Gausses

  8. Electronics 60 (56+ 4 spares) channels of: • Timing Discriminators • Amplifiers or Fan/IN-OUT • High resolution TDC LeCroy 1872 • ADCs • Delay cables • HV cables • Available • ordered

  9. Schedule of Tasks • Lucite Detector ready March 2008 • GepIII test April 1-3, 2008 • Analysis of beam test data on going • Detector final checkup on going, June-July (Light leaks, PMT signals, …) • Installation September 9, 2008 • Cabling in Hall September 16 • Data taking October 2008

  10. Manpower • Two faculty: AA & SD • Two graduate students: • Martin Jones (MS thesis on SANE), will likely relocate to JLab in the fall • Sujeeta Singh • A couple of undergraduates • Undergraduates who participated in the construction of the detectors: Christopher James, Steven Vilayvong, Juleia Allen.

  11. Beam Test (4/2008) Tested 2 sets of 8 Lucite bars each, with different electronics configurations: • Two types of TDC modules: TDC1877 and TDC1872 • Linear FAN-IN/OUT or Amplifiers • Timing vs regular discriminators • TDC1872, Amplifier, Reg. Discriminator • TDC1872, Amplifier, Reg. Discriminator • TDC1877, Amplifier, Reg. Discriminator • TDC1877, Amplifier, Reg. Discriminator • TDC1872, FAN-IN/OUT Timing Discriminator • TDC1872, FAN-IN/OUT Reg. Discriminator • TDC1877, FAN-IN/OUT Reg. Discriminator • TDC1877, FAN-IN/OUT Reg. Discriminator

  12. Beam Test BigCal vs Lucite y-position

  13. Beam Test ADC spectra

  14. Beam Test Position resolution: 6.9 (100 ps TDC + Timing Disc.) – 7.9 cm

  15. ADC vs TDC

  16. ADC vs TDC

  17. Summary • Lucite detector built and is basically ready. Scheduled to move to Hall C in September 9. • Analysis of beam test data is in progress • First analysis conclusions: • Use 25-50 ps TDCs and Timing Disc. to improve the 6.9 cm resolution • Amplifier vs Linear FAN-IN/OUT  either is fine • Discriminators  Timing Discriminators • Use ADCs for off-line analysis

  18. Still to do: • Finalize the analysis of beam test data and fine tune the analysis software for the Lucite, summer 2008 • Conduct a final checkup of the detectors (June-July) • Install detector in Hall Sept. 9 • Cabling and Set up the electronics Sept 16. • Manpower  adequate

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