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Infrastructure Collimators Beam line Shielding - Concrete / Pb Misc Superstructures - Ferris wheel

Infrastructure Collimators Beam line Shielding - Concrete / Pb Misc Superstructures - Ferris wheel Power / Water / Vacuum Hardware. Collimators. Manufacturing drawings essentially complete Out for budgetary quotes Material: Recast of existing 29 tons of Pb

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Infrastructure Collimators Beam line Shielding - Concrete / Pb Misc Superstructures - Ferris wheel

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  1. Infrastructure Collimators Beam line Shielding - Concrete / Pb Misc Superstructures - Ferris wheel Power / Water / Vacuum Hardware

  2. Collimators • Manufacturing drawings essentially complete • Out for budgetary quotes • Material: Recast of existing 29 tons of Pb • Collimator 1: Single Pb cast / machined structure +- 1mm • Primary Collimator (2): • Large wall with square hole: Smaller precision 3 axis alignable collimator: • 3” down stream & shadow shielded • Material: PbCu or Pb+ 6% Antimony (hardening agent) • Tolerance +- 0.15 mm all surfaces w.r.t. center • Collimator 3: Single large Pb wall cast +- 2mm tolerance • Plan: Place order this fiscal year

  3. Collimator 3 Collimator 1 Enclosed Region Collimator 2 (primary) Region 2 open access

  4. Beamline • Recycle “G0 instrumentation girder” --> “Qweak instrumentation girder” • Add additional “Target BPM” inside scattering chamber: • BPM inside the scattering chamber, just upstream of the target • that moves / tracks with the target flask. • Locking the DC beam position on this BPM --> the beam • will always be centered on the target! • Allows the target to be moved and "drag" the beam with it for • straight forward neutral axis studies and beam/target position set. • If the target x/y position “changes / drifts” during cooling, the position • calibration changes (motion mechanism slips) and/or beamline • gets “bumped” and alignment is messed up - these are immediately • visible by comparison to the target BPM readings with its "twin" that • does not move located just outside the scattering chamber.

  5. Beamline • The BPM inside the scattering chamber can always be the master • reference for the center of the target and is the ideal choice to put • the DC position lock on. • Absolute location of beamline BPM’s drops out of any regression analysis. • If we wish to regress on say x/y helicity correlated beam • motion it can be done totally in terms of relative units - it need not • be absolute position as no arithmetic using absolute surveyed locations • is required. • Sensitivity to helicity correlated angle modulation is obtained • by using this internal BPM and an external BPM upstream - • again no absolute reference is required. • In other words the system is self calibrating and can be used to check • the beamline BPM survey for internal constancy. • So we have some redundancy!

  6. Shielding - Concrete / Pb • All collimator “bodies” large enough in radius that line of sight from • target to Region III chamber and Quartz requires penetration • of all three collimator walls. • Collimator Base: • Concrete - no magnetic material 2 m’s upstream of target • and 1 meter below base surface. • Shielding as close to target as possible • Between collimator 1 and scattering chamber - probably Pb • (suspect this will reduce Moller background when but into Monte-Carlo) • Except for access alcoves(s) enclose region between • collimators 1 and 2 (primary) with concrete (Al rebar) • (suspect this will reduce Moller background when but into Monte-Carlo) • Leave sides and top fully accessable between • collimator 2 (primary) and collimator 3 - for region II chambers

  7. Shielding - Concrete / Pb • Detector Hut: • Made of “green blocks” for base and back wall • & existing concrete beams. • New front shield wall: • No Fe rebar (will use Al or ss) • Number of stackable pieces • May have some Pb at small radius for photon shielding • Not a precision structure • Pb Lintels inside QTOR frame • Pb wedges inside magnet to plug cracks between coils • Misc shileding around beam pipe at interfaces

  8. Region III Rotator Stand & Ferris Wheel • Region III Rotator Stand: • Made of recycled G0 forward downstream beamline stand, but ss lower legs. • Recycle all G0’s Pb boxes around 2’ beam pipe • Constructed 2 new ss boxes and filled with Pb for region • around/upstream of region III rotator - done and stored away. • G0 Ferris Wheel --> Qweak Detector Support Structure • All Al and ss, rigid and strong - would be expensive to reproduce • Has cable trays and HV cables already mounted. • Allows Pb shielded 2’ beam pipe to go through center. • Detectors will be mounted on perimeter - slighted in-front of and at larger • radius than Ferris wheel outside diameter - this open access from three sides • Easy to mount scanner, etc.

  9. Region III Cable tray Al Fe Stainless Steel Lower Legs

  10. Region 3 Rotator Sub-assemblies

  11. QTOR at MIT / Bates All coils / Holders Installed

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