Robert Hettel

TL;DR: The SLAC MeV UED system operates at 120-Hz repetition rate with outstanding performance, including the reciprocal space resolution, temporal resolution, and machine stability.

TL;DR: A review of fourth-generation ring design concepts and plans in the world is presented and it is suggested that future larger-circumference rings, possibly housed in >2-km tunnels made available by decommissioned high-energy physics accelerators, could have sub-10-pm-rad emittances, providing very high coherence for >10-keV X-rays.

TL;DR: It is shown that optical excitation induces large-amplitude in-plane displacements and ultrafast wrinkling of the monolayer on nanometer length-scales, developing on picosecond time-sc scales, which provides a new understanding of the dynamic structural processes that underlie the functionality of two-dimensional materials.

TL;DR: In this article, the authors designed an ''ultimate'' storage ring for a future light source that would be resided in the positron-electron-project (PEP) tunnel and achieves the diffractionlimited emittances (at 1.5 \AA{}) of 12 pm-rad in both horizontal and vertical planes with a 4.5-GeV electron beam.

TL;DR: In this article, the authors address the accelerator design issues related to the next generation of storage ring light sources, termed "ultimate storage rings", and identify several important areas of R&D that should be pursued to enable the realization of the full potential of ultimate storage rings.