The n-3He Project

Christopher CrawfordUniversity of Kentucky

for the n-3He Collaboration

n-3He Technical Review

ORNL, TN 2013-01-08

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

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10 Gausssolenoid

RF spinrotator

3He target /ion chamber

supermirrorbender polarizer

(transverse)

FnPB coldneutron guide

3He BeamMonitor

FNPB n-3He

Experimental setup

Measure PV spin asymmetry A ~ 1x10-7 sn kp (Viviani) 15% relative error

longitudinal holding field – suppressed PC nuclear asymmetry A=1.7x10-6 (Hale) sn kn x kp suppressed by two small angles

RF spin flipper – negligible spin-dependence of neutron velocity

3He ion chamber – both target and detector

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Experimental Layout – from NPDGamma …

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Experimental Layout – … to n3He

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Experimental Layout – … to n3He

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Even though NPDG and n3He are

very similar,

we still require two separate IRR’s

for n3He

Unistructure support – preliminary CAD model

TOP VIEW

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Unistructure support – preliminary CAD model

SIDE VIEW

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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

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Neutronics for the experiment

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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

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Chris Hayes,Kabir LatifulJosh HamblenGeoff Greene

Magnetic field

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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

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Andrés Ramirez,Libertad Barrón

Spin rotator

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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)

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Chris Hayes,Geoff GreeneChris Crawford

Inner Cylinder

Design: Complete

Construction: In progress at UT Physics machine shop. Scheduled completion date: January 2014.

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Outer Coils

Design: Complete

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

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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

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Target / detector

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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

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Mark McCreaMichael GerickeSeppo Penttila

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

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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

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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 withspin rotator, target

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Kabir LatifulIrakli GarishviliDavid 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

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Kabir LatifulIrakli GarishviliNadia FominChris 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

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Kabir LatifulIrakli GarishviliCarlos OlguinIvan NovikovNadia FominMichael GerickeChris 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

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Caleb WickershamMark McCreaJack ThomisonGeoff GreeneJosh 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

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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

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everyone…David Bowman

Installation – see Jack’s talk for more details

Commissioning / run planIRR #1IRR #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• 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

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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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