Doug MichaelJan. 12, 2004.ppt

Doug Michael Jan. 12, 2004 First goal is to be ready to select an optimal technology in ~one year. Demonstrate that fundamental technologies are ready. This limits the options to scintillator and RPCs. Improve understanding of construction techniques, risks and associated costs sufficient to decide between technologies. We have set a baseline, not made a technology decision. Demonstrate that surface operation will have sufficiently small cosmic-ray induced background. Value engineering for full detector construction. Physics optimization for a given cost. Production of “prototype” to function as a near detector. Photodetector APDs integrated together with electronics are intrinsic to making a low cost scintillator readout system Tests of intrinsic noise levels combined with electronics Broaden use experience with our systems Stability Bent fibers in liquid scintillator Light output stability Cost Engineering Light output (TiO2 loading of extrusions and resulting light output of assemblies) Construction and assembly of scintillator modules Construction and assembly of absorber system Liquid production and handling Building systems and integration with detector Electronics/APD integration and cooling systems (APD noise requires operation around -20o C) Stability: Many questions have been raised on the long-term stability of RPCs. Mostly, answers have been provided for the specific technology which we are investigating; glass RPCs as used in the Belle Experiment. Belle chambers have maintained stable efficiency for several years of operation. Keep same basic construction techniques Use the same gas mixture: Essential to keep water vapor out of the system We still want to demonstrate stability in systems built and operated as we plan for Off Axis Value Engineering Reduction in manpower and pieces in construction steps (Current construction has ~100 pieces per chamber). Industrial fabrication of strips and connection to electronics Very low cost digital electronics (3.7