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Coordinate Detector: prototype design. General idea about the Coordinate Detector (CDET) so far: Three independent vertical planes with 15 cm plastic shield in front One detector plane consists of four sections each covering 96x96 cm 2
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Coordinate Detector: prototype design • General idea about the Coordinate Detector (CDET) so far: • Three independent vertical planes with 15 cm plastic shield in front • One detector plane consists of four sections each covering 96x96 cm2 • The active element of each section is a stack of 0.5x3 cm2 scintillator bars, split in half, viewing the target • WLS fibers run through holes in the bars and transmit light to H8711-10 16-channel PMT • The task is to prototype mechanically one section of the CDET • the prototype dimensions to be close to a central section of the CDET • Instead of using scintillators will use plastic bars cut from 3/16” acrylic sheet; no holes in the bars • Front plate will be holding the assembly, made of ¼” aluminum • The bars divided in five stacks vertically and strapped to the front plate • The neighboring stacks from different section should touch each other • The thickness of the detector plane should not be much bigger than the thickness of the active part, 30mm
Connection between sections • An idea how to connect two sections without gaps between stacks • Two sections shown, each with five vertical stacks, split in half • Each stack is strapped to the front plate at different positions to make transition between the sections • The straps run through holes in the front plate • All approximate dimensions in inches
PMT to WLS connection PMT • Key element in the design, defines the thickness of one CDET section, light sealing, etc. • PMT is glued in a plastic PMT holder • PMT holder is firmly attached with screws to the front plate while the PMT goes through a hole sticking outside few mm • The WLS (not shown) are glued in the “cookie” inside holes • The cookie is attached to the front plate with springs • Aluminum plate (3mm) covers the back side of the detector • Dowel pins in the front plate center the positions of the PMT holder and the cookie • All dimensions in mm Side view WLS cookie PMT holder Front plate PMT holding plate Bottom view
