1. Los Alamos National 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

2. Los Alamos National 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

3. Los Alamos National Laboratory Damage mechanisms E-prime Si. 250 nm Peroxy Si-O-O. 600 nm Non-bonding oxygen hole center Si-O. 630 nm

4. Los Alamos National Laboratory Optical attenuation of fused silica fibers after irradiations of 1.4 x 10 21 and 1.1 x 10 23 n/m 2 --D.W. Cooke, B.L. Bennett, E.H. Farnum; J. Nuc. Materials 232, 214-218 (1996) <1 ppm OH fiber600-800 ppm OH fiber

5. Los Alamos National Laboratory Task steps Obtain samples Pre-irradiation characterization Irradiation Post-irradiation examination Effects mitigation, if needed, and re-examination Modeling

6. Los Alamos Neutron Science Center 800-MeV Linear Accelerator APT Materials Irradiation & Isotope Production LANSCE Visitor’s Center Manuel Lujan Jr. Neutron Scattering Center Weapons Neutron Research Proton Storage Ring Proton Radiography Neutron Resonance Spectroscopy Future IPF

7. Los Alamos National Laboratory Irradiation WNR 1-600 MeV spectrum 2.5 x 10 10 neutrons/m 2 /s 1 month -> 6 x 10 16 neutrons/m 2 DT Neutrons 14 MeV 8 x 10 11 neutrons/m 2 /s at 10 cm 1 week -> 5 x 10 17 neutrons/m 2 Dose determination Room temperature

8. Los Alamos National Laboratory Samples Materials Fused silica CaF 2 Reflective optics? Sizes Numbers Surface preparation Coatings

9. Los Alamos National 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)

10. Los Alamos National Laboratory Further tasks Effects mitigation Annealing Optical bleaching Modeling Point defect models

11. Los Alamos National Laboratory Task assignments TaskLead Task coordinationScott Willms (STB-FES) Optics samplesSteve Payne (LLNL) Mark Tillack (UCSD) Neutron irradiationTerry 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

12. Los Alamos National Laboratory Task timeline