Displacement Cascade Dynamics LCLSII Materials Science Ben Larson

Displacement Cascade Dynamics: LCLS-II Materials Science Ben Larson, ORNL, USA; Tom Cowan, HZDR, Germany • Displacement Cascade Dynamics and Evolution – sub-picoseconds to microseconds • Dynamics of cascades on 100 -femtosecond to few-picosecond time-scale • X-ray scattering measurement of cascade defect generation/recombination • Electronic/ionic energy partition (electron-phonon coupling) • Classical and first-principles molecular dynamics simulations • Cascade defect evolution and clustering on ~5 -ps to µs • Residual defect cluster density, type, and size evolution • Advanced Monte Carlo simulation of defect evolution/clustering • Laser Generated Proton and Heavy-Ion Pulses – picoseconds to nanoseconds • 1 - to 5 -picosecond ion pulse-width, Me. V-energy, “low-density” proton or high-Z ion pulses • Picosecond to microsecond range proton or high-Z ion pulse-widths to control dose rate • Pump-probe synchronization of laser-driven ion pulses with individual LCLS pulses • X-ray pulse parameters for cascade dynamics and evolution investigations • Pulse-width ~100 -femtoseconds; Pulse power >1012 ph. /pulse; X-ray energy ~8 -20 ke. V • Monochromatic (seeded) x-ray pulses; focusing from ~100 -nanometers to ~ 300 microns • LCLS-II Infrastructure • PW-Class, 10 s-to-100 Joule laser pulses to generate Me. V range proton or High-Z ion pulses • Diffractometer, scattering chamber, sample translation/orientation, area detector