The n- 3 He Project Christopher Crawford University of Kentucky for the n- 3 He Collaboration n-3He Technical Review ORNL, TN

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 08/09/20152

10 Gauss solenoid RF spin rotator 3 He target / ion chamber supermirror bender polarizer (transverse) FnPB cold neutron guide 3 He Beam Monitor FNPBn- 3 He Experimental setup  Measure PV spin asymmetry A ~ 1x10 -7 s n  k p (Viviani) 15% relative error  longitudinal holding field – suppressed PC nuclear asymmetry A=1.7x10 -6 (Hale) s n  k n x k p suppressed by two small angles  RF spin flipper – negligible spin-dependence of neutron velocity  3 He ion chamber – both target and detector 08/09/20153

Experimental Layout – from NPDGamma … 08/09/20154

Experimental Layout – … to n 3 He 08/09/20155

Experimental Layout – … to n 3 He 08/09/20156 Even though NPDG and n3He are very similar, we still require two separate IRR’s for n3He

Unistructure support – preliminary CAD model TOP VIEW 08/09/20157

Unistructure support – preliminary CAD model SIDE VIEW 08/09/20158

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. CrawfordSpin rotator M. Gericke Target / detector D. BowmanPreamplifiers C. CrawfordData acquisition N. FominOnline analysis J. HamblenIntegration D. BowmanCommissioning 08/09/20159

Neutronics for the experiment 08/09/201510

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 3 He analyzer (polarimetry) – April Modify beamline shielding – April 08/09/ Chris Hayes, Kabir Latiful Josh Hamblen Geoff Greene

Magnetic field 08/09/201512

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 08/09/ Andrés Ramirez, Libertad Barrón

Spin rotator 08/09/201514

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) 08/09/ Chris Hayes, Geoff Greene Chris Crawford

Inner Cylinder Design: Complete Construction: In progress at UT Physics machine shop. Scheduled completion date: January /09/201516

Outer Coils Design: Complete Construction: Outer coils fabricated using 3D print Technology. Delivered /09/201517

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 08/09/201518

Target / detector 08/09/201519

Target /detector  Scope Vacuum enclosure with 1 atm 3 He 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 3 He: March Electronics noise testingApril 08/09/ Mark McCrea Michael Gericke Seppo Penttila

Target /detector: vacuum housing  12” Conflat end flanges  1 mm Al windows  Fill gas: 1 atm 3 He  Feedthroughs: 4x signal, 2x high voltage, 2x vacuum 08/09/201521

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 will arrive late January  Assembly in February  Testing starting in March 08/09/201522

Preamplifiers  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 instrumental asymmetries with spin rotator, target 08/09/ Kabir Latiful Irakli Garishvili David Bowman

Data acquisition  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 08/09/ Kabir Latiful Irakli Garishvili Nadia Fomin Chris Crawford

Online Analysis  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-grade software – April 08/09/ Kabir Latiful Irakli Garishvili Carlos Olguin Ivan Novikov Nadia Fomin Michael Gericke Chris Crawford

Integration / preassembly  Scope : Design of unistructure support frame Design, construction of mounting and 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 08/09/ Caleb Wickersham Mark McCrea Jack Thomison Geoff Greene Josh Hamblen

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 08/09/201527

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-SeptPHASE 1 IRR Measure transverse asymmetry: Oct–DecPHASE 2 IRR 08/09/ everyone… David Bowman

Installation – see Jack’s talk for more details

Commissioning / run plan 1. Scan beam profile upstream and transfer centroid to crosshairs 2. Scan beam profile downstream 3. Align theodolite to crosshairs 4. Align B-field to theodolite 5. Field map in RFSR/Target region 6. Align the position / angle of target with theodolite / autocollimator 7. Tune RSFR / measure polarization 8. Measure physics asymmetry IRR #1 IRR #2

Timeline – see Seppo’s talk for more details  Construction of subsystems in parallel Will stage experiment in EDM building and perform dry run of field map, beam map, and alignment procedures Expect to be ready for beam at beginning of cycle Aug 2014  Milestones Begin integration on common stand Begin installation in FnPB cave IRR – begin commissioning phase Begin physics data taking  Runtime 66 days commissioning (all equipment pre-assembled) 15 days PC transverse asymmetry 1.7 x ± 0.6 x days PV longitudinal asymmetry 1.2 x ± 1.7 x * based on theoretical calculations 08/09/201531

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 08/09/201532