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HBD Light RICH -- BRIEF

HBD Light RICH -- BRIEF. T.K. Hemmick. Forward CsI RICH Progress. Spring tests disappointing: 2 million events w/ 15 tracks…none electrons. Test beam requested at SLAC March 2013. Changes for SLAC. New GEM foils…multiple strips like PHENIX. Second pad plane…hexagons to see rings.

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HBD Light RICH -- BRIEF

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  1. HBD Light RICH -- BRIEF T.K. Hemmick

  2. Forward CsI RICH Progress. • Springtests disappointing: • 2 million events w/ 15 tracks…none electrons. • Test beam requested at SLAC March 2013

  3. 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.

  4. 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.

  5. Backups

  6. 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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