Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy...
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![Page 1: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/1.jpg)
Experimental Facilities Division Oak Ridge National LaboratoryMarch 2005
ARCS Update
Doug AbernathyARCS Instrument Scientist
March 20, 2005
Joint IDT Meeting Pasadena, CA
![Page 2: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/2.jpg)
Experimental Facilities Division Oak Ridge National Laboratory2
March 2005
– a wide Angular-Range Chopper Spectrometer
Intended for study of atomic-scale dynamics in the thermal and epithermal range with single crystal capability.
IDT headed by Brent Fultz Scientist : Doug AbernathyEngineer: Kevin Shaw
Moderator decoupled poisoned waterBeam line 18Source-sample 13.6 mSample-detector 3.0m
Lattice dynamicsEntropy and the effects of vibrational modes on stability and phase transitions of solidsExcitations in disordered materials; effects of nanoscale features on vibrational entropy and thermodynamic stabilityEquations of state from measurements of the phonon density of states as a function of temperature and pressurePhonons in correlated-electron materials; coupling of lattice and electronic degrees of freedom in high T c, heavy-fermion and mixed valence materials
Magnetic dynamicsHigh temperature superconductivity Crystal field spectroscopyLow dimensional systems; 1D quantum magnets and low-dimensional conductorsMagnetism in actinide materialsHeavy fermion magnetism and superconductivityMetal-insulator transitions in oxides
Chemical PhysicsDeep inelastic neutron scattering studies of hydrogenCharacterization of novel materials
![Page 3: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/3.jpg)
Experimental Facilities Division Oak Ridge National Laboratory3
March 2005
ARCS Instrument Overview
Moderator
Shutter
Guides
Choppers
Sample
Detector Array
![Page 4: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/4.jpg)
Experimental Facilities Division Oak Ridge National Laboratory4
March 2005
Instrument Parameters
• minimum /Ei < 2%
• Ei = 10 – 1500 meV• Lengths
– Moderator to T0 chopper 9.0 m– Moderator to Fermi chopper 11.6 m– Fermi Chopper to sample 2.0 m– Sample to Detector 3.0 m
• Neutron Guide– Tapered supermirror 3.6 θc (Shutter 2.5 θc )
• 26m2 of 10-atm 3He detectors covering 2.9 Sr– Span -30o – -3o, 3o – 140o horizontal, -30o – -3o, 3o – 30o vertical. – ~100,000 pixels
• Evacuated sample and detector scattering chamber (~70m3) lined with neutron absorbing ZHIP mix (~200 m2)
![Page 5: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/5.jpg)
Experimental Facilities Division Oak Ridge National Laboratory5
March 2005
Instrument Performance
10 100 10000
2
4
6
8
(
=0)
/Ei (
%)
Ei(meV)
ARCS SEQUOIA HYSPEC CNCS
105
106
4 cm x 4 cm sample
n/cm
2 /s
SEQUOIA ARCS MAPSBest E resolution (elastic) 1.2% FWHM 2% FWHM 2% FWHM
Flux at best resolutionincident energy 50 meV
10104
n/cm2/s
15104
n/cm2/s
1.5104
n/cm2/s
Flux at 2% E/E (n/cm2/s) 45104 15104 1.5104
Horizontal angle range -30o to 60o -30o to 140o -20o to 60o
Vertical angle range -30o to 30o -30o to 30o -20o to 20o
0 5 10 15 20 25 300
-2
-4
-6
-8
-10
-12
-14
-16
Qx(Å
-1)
Qz(Å-1)
ARCS SEQUOIA CNCS HYSPEC
![Page 6: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/6.jpg)
Experimental Facilities Division Oak Ridge National Laboratory6
March 2005
Technical Developments for ARCS to reduce risk
• Detectors in vacuum (SNS detector and DAS groups)– Eliminate large vacuum windows; tight space
• Improve sample change time using a vacuum isolation system (SEQUOIA)– Reduce pumpdown time for efficient operation
• New neutron absorbing material for tank - ZHIP mix– Reduce hydrogen scatter from binder; better outgassing
• Fermi and T0 choppers (SNS chopper group/SEQUOIA)– Explore current and new ideas to optimize performance and
safety• Single crystal operation
– Build sample environment with orientation capability• Shielding optimized for background (SNS neutronics group)
– Use state-of-the-art simulations to guide design
![Page 7: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/7.jpg)
Experimental Facilities Division Oak Ridge National Laboratory7
March 2005
ARCS Scattering Chamber with Integrated Sample Isolation
0 2 4 6 8 1010-7
10-6
10-5
10-4
10-3
10-2
10-1
100
101
102
103
104
P (
Tor
r)
t (hours)
high rate pumps Roughing pumps
•Procurement process almost complete – expect contract next week
•Rotation stage on hold until other costs determined
![Page 8: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/8.jpg)
Experimental Facilities Division Oak Ridge National Laboratory8
March 2005
Fermi Chopper
• SKF/Revolve chosen as supplier of magnetic bearing, motor and housing. ARCS responsible for slit package construction.
• Contract includes integrated testing of 3 chopper systems plus one additional rotor using the translation table that will allow for quick changes of resolution in operations
• Current slit package assembly activities– Final FEA analysis done – Boron-fiber composite chosen for absorbing slat material – Assembly jig and test pieces constructed at ANL (R. Niemann) and
being modified at SNS– Spin test has validate design for final production
• Delivery of systems foreseen for mid-2005 (not a time critical activity)
![Page 9: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/9.jpg)
Experimental Facilities Division Oak Ridge National Laboratory9
March 2005
Fermi Chopper System
• Electrical and cooling connections issues resolved – final design approved.
• Translation table on order; it will be supplied to Revolve for testing of performance of Fermi choppers while mounted.
![Page 10: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/10.jpg)
Experimental Facilities Division Oak Ridge National Laboratory10
March 2005
Fermi Chopper Slit Package and Body
• Finite element stress calculations in elastic range
• All material below yield stress
![Page 11: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/11.jpg)
Experimental Facilities Division Oak Ridge National Laboratory11
March 2005
Fermi Chopper Assembly
• Assembly jig and procedure developed at Argonne
• Knowledge being transferred to new SNS chopper group members
![Page 12: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/12.jpg)
Experimental Facilities Division Oak Ridge National Laboratory12
March 2005
ARCS Detector Developments
• 109 1m 8-pack module
• 2 short modules above and below beam
• Absorbing baffles designed to block cross-talk within 90°
![Page 13: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/13.jpg)
Experimental Facilities Division Oak Ridge National Laboratory13
March 2005
ARCS Detector Developments
894 LPSDs received
![Page 14: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/14.jpg)
Experimental Facilities Division Oak Ridge National Laboratory14
March 2005
ARCS Production Process
•Complete dimensional and electrostatic measurements•Assemble into 8 packs
![Page 15: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/15.jpg)
Experimental Facilities Division Oak Ridge National Laboratory15
March 2005
ARCS
•Perform electronics tests•Perform tests with neutrons
![Page 16: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/16.jpg)
Experimental Facilities Division Oak Ridge National Laboratory16
March 2005
ARCS Flood Pattern
Tube 4 Flood Pattern
Ratio ((A-B)/(A+B))
-1.0 -0.5 0.0 0.5 1.0
Cou
nts
0
100
200
300
400
500
600
•Confirm wire integrity•Measure endpoints
![Page 17: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/17.jpg)
Experimental Facilities Division Oak Ridge National Laboratory17
March 2005
Resolution Measurements
•Measure resolution•Measure slope and offset
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Experimental Facilities Division Oak Ridge National Laboratory18
March 2005
LPSD Position Linearity
• Linear fit: Y = -5.137 x 10-2 + 1.998 x 10-3 X
• LPSD response is linear
LPSD Test Number
Coefficient of Determination
4 .99987
5 .99997
7 .99995
8 .99999
Tube 5 Linearity
Position Along Tube (mm)
-500 -400 -300 -200 -100 0 100 200 300 400 500
Rati
o (
(A-B
)/(A
+B
))
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
When tests are completed 8 pack is ready to Install
![Page 19: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/19.jpg)
Experimental Facilities Division Oak Ridge National Laboratory19
March 2005
ARCS Procurement Status Overview
Item Design Procurement Cost
Core Vessel Insert Done Installed $92,400
Shutter Insert Done Installed $59,610
Guide – shutter Done Installed $60,000
Guide – beamline Done Bidding period; install before CD-4 measurement
$260,000
T0 chopper Draft spec ~ 9 month delivery $261,000
Fermi chopper Done Expected 5/05 $410,000
Slit Package Assembly Done 4/05 $40,000
LPSDs Done All 1m tubes in $1,100,000
Electronics & Mounting Final testing 7/05 or as needed $600,000
Vacuum chamber – sample isolation, vessels & pumps
Done Contract 3/05
~1 year delivery
$1,900,000
Shielding – Poured-in-place Done Forms under construction $30,000
Shielding - Other Neutronic and safety evaluation ongoing
$1,000,000
Green: Committed $
Blue: Expected by 5/05
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Experimental Facilities Division Oak Ridge National Laboratory20
March 2005
ARCS Project Controls
$0
$2,000,000
$4,000,000
$6,000,000
$8,000,000
$10,000,000
$12,000,000
$14,000,000
2001 2002 2003 2004 2005 2006
ARCS BA Plan ARCS Spending Plan ARCS Cum Funding
•Now using SNS system
•Monthly reporting to DOE
•Rebaselining effort underway
![Page 21: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/21.jpg)
Experimental Facilities Division Oak Ridge National Laboratory21
March 2005
Recent activities and ongoing work
• DOE Construction Progress Review held August 9-10, 2004
– Closeout cited good working relationship among the project personnel
– Strong recommendation to adopt project controls as done for other instruments and updating of controlled documents (PEP, design configuration, specifications, etc.)
– Strongly endorsed sample isolation concept
• Contracts for scattering chamber and guide to be placed soon
• Clarification of sample area design needed (this meeting, neutronics calculations, safety issues with hydrogenous material)
• Re-evaluating project schedule and cost for the last 18 months of the project
![Page 22: Experimental Facilities DivisionOak Ridge National Laboratory March 2005 ARCS Update Doug Abernathy ARCS Instrument Scientist March 20, 2005 Joint IDT.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649d805503460f94a6534b/html5/thumbnails/22.jpg)
Experimental Facilities Division Oak Ridge National Laboratory22
March 2005
Instrument Model Views