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Progress Report on Cherenkov Beam Test - April 2012

This report details the current status and progress of the Cherenkov beam test conducted on April 14, 2012. It covers critical elements such as beam collimation, alignment techniques, and the development of the lift table and pad plane designed by SBU engineers. Key updates include the integration of the remote-controlled lift mechanism and tracking systems using quintuple GEM stacks. The report highlights challenges faced, particularly with the pad plane vacuum system, and outlines methods for effective particle trajectory tracking.

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Progress Report on Cherenkov Beam Test - April 2012

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  1. Progress/Status on Cherenkov Beam Test4-14-2012 TK Hemmick

  2. Reminder: Spring Test Config • “Beam” consists of scattered electrons & pions. • Particles must be “collimated”. • Need to point detector at target. • Slide jack post back&forth via remote control.

  3. Reminder: Layout • All aboard! • Quintuple GEMstack (can always “shrink”). • Need trackers to know each particle’s trajectory. • PbGl is used to identify electrons. • Bore site laser for initial alignment. • Coarse pads in case scintillators fire too fast. • MRCP??

  4. Reminder: Segmentation • RING images produce POSITION CORRELATION! • Ambiguity for Compass (Cartesian) Coordinates • SOLN: New pad plane • ¼ rings in four quadrants • STAR-style strip-pixels.

  5. Progress: Lift Table • Lift Table design: Benji Lewis (postdoc) • Lift Table build by SBU Machinists. • Required: ~10 degrees. • Lifts machinist for 7 degrees and above.

  6. Progress: Pad Plane • Pad Plane Design, SBU Engineer Chuck Pancake. • Pad Plane(s) delivered 3 weeks late. • Good News: Pin test was free.

  7. Pad Plane Vacuum System • Desire: Pump to change gas. • Challenge: Pad plane can’t withstand diff. pressure of 1 atm. • Solution: Pump both sides using removable flange.

  8. System Assembly • Kondo and Kiad(UVA) bring trackers & DAQ. • Calorimeter from M. Jones. • Gas System running: 1ppm O2 0.23 ppm H2O

  9. Remote Control Software • Author mostly Benji Lewis • Gas System:Ben Chonigman. Lift Table Lift Table Tracker HV

  10. Analysis Software • Combinatorial Hough Transform: • Any three points define Xcenter, Ycenter, R • Pseudo-points: all X/Y combinations in a quadrant. • Fill 3D histogram with X,Y,R…peak bin = ring. • Graduate Student: HuijunGe What could be missing?

  11. Mirror, Mirror • Finally arrived! • 2 mirrors… reflectivity (>80% down to 120 nm) • Aligned in two steps: • Laser hits mirror center & reflects back to itself. • Laser hits target in Hall A.

  12. CsI cathode done. • Vessel goes into Glovebox • Installed Thursday night. • Tests Friday • CONCERN: One GEMstarted to drawcurrent last night

  13. April 15 (if GEM recovers) • Drive on Sunday. • Work with Kondo more on DAQ Monday. • Install Tuesday. • If GEM requires replacement. • Have spares. • Place vessel in glovebox. • 2 days to get below 10 ppm water. • 1 day to replace & start CF4. • 1 day to test. • Delivery next week only …

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