los alamos national laboratory ife final optics neutron irradiation scott willms with input from jim...
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Los AlamosNational Laboratory
IFE Final Optics Neutron Irradiation
Scott Willms
With input from Jim Cobble (P-24), Terry Taddeucci, Steve Wender (LANSCE-3), D. Wayne Cooke, Kurt Sickafus, Mike Stevens, Robert Hanrahan, Kathleen
Alexander (MST-8), and Stuart Maloy (AAA-TPO)
Los Alamos National Laboratory
Presented February 6, 2001
At Naval Research Laboratory
Los AlamosNational Laboratory
Task summary
• Purpose: Determine the effect of fusion neutrons on the properties of IFE final optics
• FY01 deliverable: Expose optics sample to neutrons and perform pre- and post-irradiation examination
• Funding requirement: $300K
Los AlamosNational Laboratory
Damage mechanisms
• E-prime
• Si.
• 250 nm
• Peroxy
• Si-O-O.
• 600 nm
• Non-bonding oxygen hole center
• Si-O.
• 630 nm
Los AlamosNational Laboratory
Optical attenuation of fused silica fibers after irradiations of 1.4 x 1021 and 1.1 x 1023 n/m2
--D.W. Cooke, B.L. Bennett, E.H. Farnum; J. Nuc. Materials 232, 214-218 (1996)
<1 ppm OH fiber 600-800 ppm OH fiber
Los AlamosNational Laboratory
Task steps
• Obtain samples
• Pre-irradiation characterization
• Irradiation
• Post-irradiation examination
• Effects mitigation, if needed, and re-examination
• Modeling
Los Alamos Neutron Science Center
800-MeV Linear Accelerator
APT MaterialsIrradiation
& Isotope Production
LANSCE Visitor’s Center
Manuel Lujan Jr.Neutron Scattering
Center
WeaponsNeutron Research
Proton StorageRing
ProtonRadiography
Neutron ResonanceSpectroscopy
Future IPF
Los AlamosNational Laboratory
Irradiation
• WNR
• 1-600 MeV spectrum
• 2.5 x 1010 neutrons/m2/s
• 1 month -> 6 x 1016 neutrons/m2
• DT Neutrons
• 14 MeV
• 8 x 1011 neutrons/m2/s at 10 cm
• 1 week -> 5 x 1017 neutrons/m2
• Dose determination
• Room temperature
Los AlamosNational Laboratory
Samples
• Materials
• Fused silica
• CaF2
• Reflective optics?
• Sizes
• Numbers
• Surface preparation
• Coatings
Los AlamosNational Laboratory
Pre- and post-irradiation characterization
• Transmissive property measurements
• Ring-down reflectometer
• Optical spectroscopy (250-2000 nm)
• Single wavelength test?
• Other
• Other measurements
• Transmission electron spectroscopy (TEM)
• Electron spin resonance (ESR)
• Energy-filtered electron diffraction (EFED)
• Extended X-ray absorption fine structure (EXAFS)
Los AlamosNational Laboratory
Further tasks
• Effects mitigation
• Annealing
• Optical bleaching
• Modeling
• Point defect models
Los AlamosNational Laboratory
Task assignmentsTask Lead
Task coordination Scott Willms (STB-FES)
Optics samples Steve Payne (LLNL)
Mark Tillack (UCSD)
Neutron irradiation Terry Taddeucci (LANSCE-3)
Pre and Post irradiation examination Transmissive properties Other property measurements
Modeling
Wayne Cooke (MST-8)Ralph Berggren (P-24)Kurt Sickafus (MST-8)/ Stuart Maloy (AAA-TPO)Cooke/Sickafus/Maloy
Los AlamosNational Laboratory
Task timeline
ID Task Name
1 Obtain samples
2 Perform pre-irradiation tests
3 Irradiate
4 Post-irradiation test
5 Modeling
6 Report
3/5Jan Feb Mar Apr May Jun Jul Aug Sep Oct
2001 2002