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MOLLER

MOLLER . Juliette M. Mammei. Working Groups. Supergroup. Polarized Source Hydrogen Target Spectrometer Integrating Detectors Tracking Detectors Polarized Beam Instrumentation Polarimetry Electronics/DAQ Simulations Analysis. Simulation. Improvements to the radiative effects.

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MOLLER

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  1. MOLLER Juliette M. Mammei

  2. Working Groups Supergroup Polarized Source Hydrogen Target Spectrometer Integrating Detectors Tracking Detectors Polarized Beam Instrumentation Polarimetry Electronics/DAQ Simulations Analysis Hall A Collaboration Winter 2012 Meeting

  3. Simulation • Improvements to the radiative effects • Large group that meets regularly • TOSCA and GEANT4 applications • Continually improving the usability of the GEANT4 simulation • Adding generators • Improving functionality Hall A Collaboration Winter 2012 Meeting

  4. Simulation Projects Detector Array Roman Pots (for tracking detectors) Hybrid Torus Upstream Torus Scattering Chamber Target Collimators 28 m • Detector geometry • Collimators • Target length • Backgrounds • Spectrometer • Optics • Sensitivity study • Magnetic forces Incoming Beam Hall A Collaboration Winter 2012 Meeting

  5. Detectors • Geometry • Define rings • Quartz shape, size • Quartz housing • Light guide shape, size • Endcap shape, size • Reflector length, angle • Optics • Refractive index • Cerenkov angle • TIR critical angle • Tolerance to preserve TIR Baseline design from Qweak scanner detector Hall A Collaboration Winter 2012 Meeting

  6. Detectors Hall A Collaboration Winter 2012 Meeting

  7. Detectors Hall A Collaboration Winter 2012 Meeting

  8. Detectors Hall A Collaboration Winter 2012 Meeting

  9. Detectors Prototypes! Hall A Collaboration Winter 2012 Meeting

  10. Spectrometer Have nominal designs, but choices to make • Ongoing simulation and pre-R&D work • TOSCA and GEANT4 applications • Conductor size • Optics optimization • 3-coil option • Vacuum vs. air • Interfacing with MIT engineers • Jason Bessuille, Ernie Ilhoff, Jim Kelsey, Cathy Moran (designer) • Design (conductor size, electrical and water connections) • Water-cooling • Supports Hall A Collaboration Winter 2012 Meeting

  11. Spectrometer 3L 3R 4L 4C 4R 2L 2R 1BL 1BR 1AL 1AR Hall A Collaboration Winter 2012 Meeting

  12. TOSCA → Solidworks Coil Package with single out-of-plane bends Volume comparison of coils. Only the differences are shown. Blue = native SWX model, brown = imported model Note: Imported coils have dual s-bends; Native SWX coils are changed to single s-bends Hall A Collaboration Winter 2012 Meeting

  13. Cooling Circuits Coolant flow rate 8339 - 1550 A/cm2 8674 - 1750 A/cm2 8204 - 2000 A/cm2 Hall A Collaboration Winter 2012 Meeting

  14. Qweak Coil & Carrier Hall A Collaboration Winter 2012 Meeting

  15. QWEAK Toroid Assembly QTOR Assembly (with left frame removed for clarity) Hall A Collaboration Winter 2012 Meeting

  16. MOLLER Toroid Assembly Guide Rails Service feedthru ports (power and cooling) ee and ep tracks In-vacuo coils Standard 3/8 thk 46”diameter 316 Steel Pipe Single module, crane-able assembly, with very limited access during runs Hall A Collaboration Winter 2012 Meeting

  17. Spectrometer Preliminary 50x deflection scale Hall A Collaboration Winter 2012 Meeting

  18. Plan going forward Magnet engineering review in spring Decide on a conductor type Discuss Hall A infrastructure to develop conceptual system design including pumps, chillers, heat exchangers and power supply Iterate between TOSCA and FEA simulations with the modified coils (single s-bends) and new choice of conductor Involve potential coil vendors at this stage In parallel, review in-vacuum vs. out-of-vacuum options, and 2-coil vs. 3-coil configurations Once a mounting configuration is established, start designing support frame, coil package details, and coil carriers in parallel. Hall A Collaboration Winter 2012 Meeting

  19. Target • CFD used to model the highly successful Qweak target • CFD-FAC under development for R&D • Hall C target • highest power PV suitable target ρ fluctuations < 26 ppm ½ Qweak δρ/ρ @ 2x power Hall A Collaboration Winter 2012 Meeting

  20. Polarized BeamSource and Measurement 0.4% accuracy or better Polarization Positions, angles, energy, intensity 2nd order beam properties • Source work • Pockels vs. Kerr cell • Two cells • Spot size monitoring • DAQ –upgrades for > 30 Hz flip rates (>1 MHz!) • Polarimetry upgrades • Compton • Electron detector • Photon detector • Improved analysis • Møller • Upgraded high field polarimeter • Atomic hydrogen Møller (Mainz for P2) Hall A Collaboration Winter 2012 Meeting

  21. Auxiliary Detectors Tracking – GEMs (Q2, beam backgrounds, etc.) Luminosity – Quartz (target density and beam fluctuations, electronics noise) Pion Backgrounds – Pb-glass (Pions and other hadron backgrounds) Hall A Collaboration Winter 2012 Meeting

  22. Summary • Much progress on • Simulation • Spectrometer • Detectors • Ramping up • Source • Target • Polarimetry • Auxiliary detectors Hall A Collaboration Winter 2012 Meeting

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