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n-3He Project Technical Review 2013: Experiment Design & Execution

Detailed technical review of n-3He project by University of Kentucky for n-3He Collaboration, covering experiment design, setup, execution, resources, and collaboration aspects. Discussion on experiment layout, manpower, and scheduling.

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n-3He Project Technical Review 2013: Experiment Design & Execution

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  1. The n-3He Project Christopher Crawford University of Kentucky for the n-3He Collaboration n-3He Technical Review ORNL, TN 2013-01-08

  2. Outline • Experiment design • Reaction and observable • Experimental setup • Execution • Commissioning plan– 2 configurations • Run time • Resources • Collaboration • Organization • Manpower • WBS subpackages • Beam line • Solenoid • Spin rotator • Target / detector • Preamplifiers • Data acquisition • Online analysis • Integration • Commissioning

  3. Experimental setup Measure PV spin asymmetry A ~ 1x10-7sn  kp(Viviani) 15% relative error longitudinal holding field – suppressed PC nuclear asymmetry A=1.7x10-6(Hale) sn  kn x kpsuppressed by two small angles RF spin flipper – negligible spin-dependence of neutron velocity 3He ion chamber – both target and detector supermirror bender polarizer (transverse) FnPB cold neutron guide 10 Gauss solenoid 3He Beam Monitor RF spinrotator 3He target / ion chamber FNPB n-3He

  4. Experimental Layout – from NPDGamma …

  5. Experimental Layout – … to n3He

  6. Experimental Layout – … to n3He Even though NPDG and n3He are very similar, we still require two separate IRR’s for n3He

  7. Unistructure support – preliminary CAD model TOP VIEW

  8. Unistructure support – preliminary CAD model SIDE VIEW

  9. n-3He collaboration • Spokespersons D. Bowman, M. Gericke, C. Crawford • Local Project Manager S. Penttila • Project Engineer Jack Thomison • Work Subpackage Leaders G. Greene Neutronics L. Barrón Solenoid C. Crawford Spin rotator M. Gericke Target / detector D. Bowman Preamplifiers C. Crawford Data acquisition N. Fomin Online analysis J. Hamblen Integration D. Bowman Commissioning

  10. Neutronics for the experiment

  11. Neutronics for the experiment • Scope • FnPB guide, polarizer, beam monitors – stays UNCHANGED • PPS remains UNCHANGED • Beam profile scanners, polarimetry • Status • All equipment is being used for NPDG experiment except the beam profile scanners • XY-scanners in hand and tested • Remaining work • Design shielding and mounts for xy-scanner – April • Design mount for 3He analyzer (polarimetry) – April • Modify beamline shielding – April Chris Hayes,Kabir LatifulJosh Hamblen Geoff Greene

  12. Magnetic field

  13. Magnetic field • Scope • Magnetic field simulations to verify adiabatic spin rotation and uniformity • Unistructure frame for Magnetic coils, Spin rotator, and Target/detector mounts directly onto existing NPDG stands on the beamline • Design, construction, and testing of longitudinal solenoid 10 Gauss holding field, just like NDPG • Status • Conceptual design, preliminary calculations indicate adiabaticity 15 coils, 15 cm apart, 35 cm radius, 150 A turns • Materials for frame and coil supports are in hand • Remaining work • Machining of coil supports: January – March • Assembly of coils and stand: April • Test coils and mapping of field at UNAM: May Andrés Ramirez, Libertad Barrón

  14. Spin rotator

  15. Spin rotator • Scope • Design of RF double cos-theta coil • Machining forms for inner/outer coils, aluminum enclosure, mounts • RF driver electronics • Field mapping and testing • Status • Design complete • Machining of coil forms near completion • RF driver electronics exist and are being used for NPDG • Remaining work • Winding of coils: January • Construction of enclosure: Jan (in parallel) • Testing and field mapping: Jan–Feb (in parallel) Chris Hayes, Geoff Greene Chris Crawford

  16. Inner Cylinder Design: Complete Construction: In progress at UT Physics machine shop. Scheduled completion date: January 2014.

  17. Outer Coils Design: Complete Construction: Outer coils fabricated using 3D print Technology. Delivered 2014-01-03

  18. Aluminum Shell Design: Some design issues are still in progress including a moveable stand for precision alignment with neutron beam. Construction: Aluminum shell will be built by UT physics machine shop end of January

  19. Target / detector

  20. Target /detector • Scope • Vacuum enclosure with 1 atm 3He • 144 channels of sense wires • Status • Vacuum enclosure in hand • Wires soldered to frames • Remaining work • Assemble wire plane stack, readout plane: Feb – March • Vacuum test and fill with 3He: March • Electronics noise testing April Mark McCrea Michael Gericke Seppo Penttila

  21. Target /detector: vacuum housing • 12” Conflat end flanges • 1 mm Al windows • Fill gas: 1 atm 3He • Feedthroughs: 4x signal, 2x high voltage, 2x vacuum

  22. Target / detector: ion chamber wire planes • 17 HV planes • 16 signal planes • 144 signal wires • All wires soldered to frames • Mounting hardware and fittings all constructed • PCB readout boards willarrive late January • Assembly in February • Testing starting in March

  23. Preamplifiers Kabir Latiful Irakli Garishvili David Bowman • Scope • 4 boxes of 36 channels: one per vacuum feedthrough • Circuit board designed locally at ORNL • Connector to ion chamber vacuum port and cabling to DAQ module • Status • Circuit boards constructed and initial testing complete • Achieved theoretical limit on some channels, testing in progress • Remaining work • Design forced air cooling • Build cables to preamp • Test all channels • Test instrumentalasymmetries withspin rotator, target

  24. Data acquisition Kabir Latiful Irakli Garishvili Nadia Fomin Chris Crawford • Scope • 144 channels of 24 bit, 128 KS/s ADC • Standalone system: NO support from DAQ group • Progress • PO to be issued for data acquisition electronics next week – delivery of hardware end of March, firmware upgrade end of May • Basic control software written; used to take and analyze data • Preliminary measurements of electronic noise – within specification • Remaining work • Build cabling from preamps to DAQ: Jan • Test complete system: Feb – April

  25. Online Analysis Kabir Latiful Irakli Garishvili Carlos Olguin Ivan Novikov Nadia Fomin Michael Gericke Chris Crawford • Scope: • Data transfer and analysis computers • 36 TB RAID storage • Online analysis software • STAND-ALONE system – no support required from DAQ group • Status: • NPDG infrastructure • Existing software • Schedule forward: • Build complete network – March • Production-gradesoftware – April

  26. Integration / preassembly • Scope: • Design of unistructure support frame • Design, construction of mountingand alignment hardware • Maintain 3d solid model of experiment • Status: • Preliminary solid model exists • Conceptual design for mounts and alignment • Remaining work: • Final design of stand and mounting / alignment: Feb • Construction of mounting, alignment hardware: Apr • Assembly of complete system: May-June • Dry run of commissioning process: June Caleb Wickersham Mark McCrea Jack Thomison Geoff Greene Josh Hamblen

  27. Alignment • Mounting / alignment components • Aperture / crosshairs for beam scan • Support stand and xy-adjustment for theodolite • Alignment V-block for trimming B-field • Optical system and adjustable mount for target • 10 mrad tolerance – no need for S/A crew

  28. Commissioning • Scope: • Testing for instrumental asymmetries • Dry run of commissioning during assembly • Polarimetry and beam scans • Alignment of beam / magnetic field / chamber • Measurement of parity-conserving asymmetry with transverse field • Status: • Preliminary commissioning plan well-thought out • Remaining work: • Installation in FnPB: July • Beam alignment scans: Aug-Sept PHASE 1 IRR • Measure transverse asymmetry: Oct–Dec PHASE 2 IRR everyone… David Bowman

  29. Installation – see Jack’s talk for more details

  30. Commissioning / run plan IRR #1 IRR #2 • Scan beam profile upstreamand transfer centroid to crosshairs • Scan beam profile downstream • Align theodolite to crosshairs • Align B-field to theodolite • Field map in RFSR/Target region • Align the position / angle of target with theodolite / autocollimator • Tune RSFR / measure polarization • Measure physics asymmetry

  31. Timeline – see Seppo’s talk for more details • Construction of subsystems in parallel • Will stage experiment in EDM building and performdry run of field map, beam map, and alignment procedures • Expect to be ready for beam at beginning of cycle Aug 2014 • Milestones • 2014-05-01 Begin integration on common stand • 2014-08-01 Begin installation in FnPB cave • 2014-10-06 IRR – begin commissioning phase • 2014-02-15 Begin physics data taking • Runtime • 66 days commissioning (all equipment pre-assembled) • 15 days PC transverse asymmetry 1.7 x 10-6 ± 0.6 x 10-7 • 208 days PV longitudinal asymmetry 1.2 x 10-7 ± 1.7 x 10-8* based on theoretical calculations

  32. Resources – see Jack’s talk for more details • Minimal utilization of SNS crafts • Most equipment mounted on single support structure,staged in the EDM building, craned onto NPDG det. Support • Machining will be done at university shops • only SNS engineer is Jack Thomison, on n3He funds– 3D solid model will be drafted within the collaboration,reviewed by Jack, and incorporated into SNS model • Minimal radiological group support– MCNP model created by Nadia Fomin, Paul Mueller, validated by radiation group • No survey & alignment resources required – alignment is relative to beam scan • No support required from DAQ group – standalone system

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