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HBD -- BRIEF

HBD -- BRIEF. T.K. Hemmick. Preparation for Next Test Beam. End Station A. SLAC ESTB (End Station Test Beam) Back ~1/3 of SLAC for light source. 120 Hz “moderate” beam 5 Hz (minimum) pickoff  Target  ESA (~1 e/pulse) We are 1 st outside users--first beam arrives Tuesday(?)

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HBD -- BRIEF

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  1. HBD -- BRIEF T.K. Hemmick

  2. Preparation for Next Test Beam End Station A • SLAC ESTB (End Station Test Beam) • Back ~1/3 of SLAC for light source. • 120 Hz • “moderate” beam • 5 Hz (minimum) pickoff  Target  ESA (~1 e/pulse) • We are 1st outside users--first beam arrives Tuesday(?) • Our run = May 1st or shortly thereafter. Glory Days

  3. Beam ESA Experimental Area ESTB Beam Dump

  4. Today…Junk Pile (useful for test beam) Flexible Much old stuff to borrow. Technical staff Can I sell you a used magnet?

  5. We’re ready… • GEM stack assembled & running w/o CsI. • Evaporate midlate April(effort & $$$ to keep fresh) New Segmented GEMs New Mesh 88% Transparent New SRS DAQ System New HV Chain New Pad Plane -- Hexes Spark Detection

  6. Summary – Our Baby is Ready! 55Fe – pickoff Bottom GEM Single 55Fe Event Event Display DAQ Talks… Son Granddaughter To PhD Program Stephanie Marie

  7. Backups

  8. 90 80 Mirror Developments Commercial mirror 200 120 • Cherenkov photon yield primarily at small l. • Deep UV mirrors use 250 AoMgF2 overcoat to act as dielectric mirror. • Plans: • Year 1: Develop in-house manufacture of small mirrors. • Year 2: Scale up to use Big Mac • First in-house mirror made! • Reflectivity tests pending at BNL.

  9. Changes for SLAC • New GEM foils…multiple strips like PHENIX. • Second pad plane…hexagons to see rings. • New trip detection system: • Capacitive coupling off resistor chain. • Integrated with PHENIX HBD HV relays.

  10. Forward RICH • RICH particle ID involves a limited dynamic range of momenta set by gas index of refraction. • The highest momenta rely on the lowest n. • Our R&D targets the highest momenta with a CsI photo-cathode RICH. • Major Issue: Reflectivity of mirrors deep in the UV.

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