Update on the Gas Ring Imaging Cherenkov (GRINCH) Detector for A 1 n using BigBite Todd Averett Department of Physics The College of William and Mary Williamsburg,

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Presentation transcript:

Update on the Gas Ring Imaging Cherenkov (GRINCH) Detector for A 1 n using BigBite Todd Averett Department of Physics The College of William and Mary Williamsburg, VA USA SBS Meeting January 16, 2013 In collaboration with: H. Yao, William and Mary B. Wojtsekhowski, S. Esp, Jefferson Lab A. Ahmidouch, S. Danagoulian, NC A&T K. Anoil, Cal. State LA J. Annand, Glasgow Physics Department at William and Mary Wiki:

Motivation: High Rate Running Expect 4-5x increase in total luminosity over previous BigBite running. Assume 4-5x background rate. 30 degree scattering angle Segmented PMT array (29mm tubes), 9(8) x 60 tubes Search for timing clusters in 5-10 ns window. Magnetic shielding between rows. Locate PMT array on large angle side away from beam line. Shield beamline for EM background. C 4 F 8 O heavy gas at 1 atm

Simulation and Design Design based on GEANT 4 simulation and geometric constraints from BigBite detector package 65 cm path length, 85 cm keep out Single reflection from cylindrical mirrors. Not focusing on specific PMT’s, not sensitive to precise mirror geometry/alignment Clusters with avg 10 PMT’s/event and 1.7 p.e.’s/tube

Electron and π efficiencies

Design First draft of design complete. Iterating on details. Detector vessel made from frame of angled aluminum with sheet aluminum sides Small angle side removable for internal access. Windows glued onto box directly. 9 (8) x 60 array of PMT’s in iron box, with mu metal and iron strips/bars between rows. Attach to vessel, removable. Removable mirror frame.

Mirror Frame

Mirror alignment Mirror

Mirror Tests Received sample of Al coated Lexan, flat pieces, from ECI coatings. H. Yao to measure reflectivity in test stand for flat and then curved mirrors. Assemble prototype mirror mount at W&M to test ability to shape and align mirror. Optimize mirror design. Procure mirrors—W&M. Quote for 6 mirrors ~$7k

PMT Array Shielding Box NC A&T

Magnetic Shielding TOSCA simulations using mu-metal and iron plates between PMT rows.

Light Cones Aluminized plastic cones

NC A&T Status A. Ahmidouch, S. Danagoulian Responsible for PMT shielding box: prototype and full assembly We have all necessary quotations. We submitted POs for some of the items In the process of submitting the remaining POs. We will have a prototype with 34 PMT, fully assembled, including – iron shielding bars between rows – mu-metal shielding bars – light catchers When we receive iron bars and light catchers, then we will send them for mirror deposition.

Electronics, HV, Cables All 1877s FastBus TDC’s and level translators (from MWDC) are ready. Need 64 channels of +HV. Provided by JLab Flat twisted ribbon cables for TDC’s—Jlab, W&M. NINO-based amplifier, discriminator cards— Glasgow. Prototype testing underway. J. Annand visiting Monday. K. Anoil recently purchased cards.

Manpower and Budget

Plans Finish production drawings for vessel, mirror mounting, March 31 st, 2013 – Send drawings for quotes, April – Fabrication, Summer 2013 – Assembly, Fall 2013 – Testing, late 2013 Finalize mirror design studies by March 31 st – Order mirrors April, May