This will involve relocating the five experimental stations on the A, B, C, and D beamlines, and upgrading the replacement stations with independently tunable high-flux undulator sources. The goal of the workshops was to identify pressing and important scientific needs for a future high-energy x-ray source utilizing unique capabilities of the Cornell accelerator and special types of organization and user support.
This will involve relocating the five experimental stations on the A, B, C, and D beamlines, and upgrading the replacement stations with independently tunable high-flux undulator sources. The goal of the workshops is to identify the most pressing and important scientific needs for a future high-energy x-ray source utilizing unique capabilities of the Cornell accelerator and special types of organization and user support.
As in past years, the user community heard updates on status, vision and new capabilities by CHESS Director Joel Brock and Associate Director Ernie Fontes, followed by Marian Szebenyi speaking for MacCHESS and Matthew Miller for the InSitμ program. Accelerator physicist James Shanks talked about successful conclusions to upgrade projects he mentioned last year towards reducing x-ray beam sizes at the undulator sources, reducing injection times, and increasing currents in the storage ring.
In addition, this past year the A2 station was upgraded to deliver filtered white beam from its undulator; early feasibility work doing fast time-resolved Laue and energy-dispersive diffraction was very successful. With additional demand on A2, the time came to ask if the A1 station could be reconfigured to deliver x-rays energies above 19.5 keV.
Thirty students from fourteen different institutions (including ones as far away as UC Irvine and the University of Puerto Rico) attended the workshop in person, and fifteen students from eleven institutions and companies attended the course remotely via WebEx and YouTube Live. Five different expert instructors gave students a day and a half of lectures and hands-on tutorials in SAXS fundamentals, data collection, and data processing.
Jeffrey DeStefano, an HIV researcher at the University of Maryland, College Park and post-doc Gauri Nair published a paper in 2008 about their development of a new inhibitor of HIV RT (reverse transcriptase), the viral enzyme which copies viral RNA into DNA in order that it might be incorporated into the host cell's chromosomes by another viral enzyme, integrase (3). The RT inhibitor consisted of a 38 base pair piece of DNA with a particular sequence which binds tightly to the enzyme.
Furthermore, many engineering departments have committed themselves to developing educational programs that deepen students’ understanding of fundamental concepts, enhance students’ active participation in learning, and establish engineering’s role in meeting the needs of a global society. The U.S.
Sr3Ir2O7 is an unusual manifestation of a bilayer square lattice of spins (as illustrated at top of the Figure) due to the extended exchange inherent to its 5d electron valence states and their large orbital extent, not only within but also between bilayer planes. As a result, this system potentially exists in a unique parameter space where the strength of magnetic exchange coupling between these planes can approach or exceed the strength of the coupling within them.
This activity also required removing about 17 m of the storage ring where it passed through the center of CLEO, then installing bridge supports and finally re-installing the bridging I-beams, holding the accelerator magnets and vacuum system. All of this was accomplished on schedule in three months. The success of the re-installation is underscored by the fact that positron beam was stored with no adjustments to CESR on the very first attempt!