T.K. Hemmick. Preparation for Next Test Beam SLAC ESTB (End Station Test Beam) Back ~1/3 of SLAC for light source. 120 Hz “moderate” beam 5 Hz (minimum)

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Presentation transcript:

T.K. Hemmick

Preparation for Next Test Beam 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(?) Our run = May 1 st or shortly thereafter. 2 End Station A Glory Days

ESA Experimental Area Beam ESTB Beam Dump

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

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

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

Backups 7

Mirror Developments Cherenkov photon yield primarily at small. Deep UV mirrors use 250 A o MgF 2 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 Commercial mirror

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. 9

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. 10