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Optimal Design Optimization for Accelerated Timing Resolution in Modified HCAL System

Explore the enhanced HCAL-J physics design, featuring new scintillator and WLS materials for improved timing resolution. Incorporate optimized PPO concentration and innovative light-guide geometry for high transmission. Track the progress of prototype construction and detailed design finalization. Initiate scintillator production and secure WLS material procurement. Stay updated on steel absorber and module quotes for timely order placements aligned with available funding.

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Optimal Design Optimization for Accelerated Timing Resolution in Modified HCAL System

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  1. HCAL-J • Physics Design Optimization • Original JINR COMPASS HCAL design modified to obtain faster timing resolution. New design uses alternative scintillator and wavelength shifter (WLS) materials. WLS moved to center of module. • Optimal PPO concentration (0.5%) determined via measurements of FNAL supplied extruded scintillator coupled to WLS material. • St. Gobain BC-484 and Eljen EJ-299-27 WLS material tested with FNAL scintillator. BC-484 selected as optimal WLS. • Single element castable light-guide geometry designed with optical photon package of GEANT4. High transmission geometry achieved. • Prototype Construction and Detailed Design • Components tested and performance used to benchmark simulations • Detailed design (bolt placement, etc.) being finalized • Structural prototype (can, ribs, endplates…) being assembled. (Encountered some problems with manufacturer meeting specs.) • HCAL-J Construction • Scintillator production initiated (First shipment early 2014.) • P.O. for BC-484 placed by INFN (Bellini et. al.) • Light guide manufacturing to be initiated this fall. • Quotes for steel absorbers and modules must be updated prior to placing orders. • Construction scheduled determined by available funding.

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