Since September 2019, the National Science Foundation (NSF) supports the operation of the Center for High Energy X-ray Sciences (CHEXS) at the Cornell High Energy Synchrotron Source (CHESS) as a national user facility. CHEXS consists of a suite of high-energy X-ray beamlines that serve the national user community in specifically targeted research areas in materials research, biology and engineering.
Since CHESS resumed user operation after the CHESS-U upgrade project in October 2019, the facility has operated at 50mA positron current. Accelerator and beamline scientists have continuously and carefully optimized storage ring parameters and beamline performance to deliver high intensity and stable X-ray beams to users. This effort has allowed us to increase the ring current to 75 mA on Feb. 18 and now to 100mA on March 11th.
In a recent experiment at the Forming and Shaping Technology (FAST) Beamline, researchers from Confluent Medical studied the microstructural evolution of NiTi shape memory alloys during fatigue loading. NiTi shape memory alloys are often used in medical devices including heart valve frames and stents. Due to their critical importance to patient safety, these devices have stringent fatigue lifetime requirements.
CHESS is working in concert with Cornell University to maintain a safe research atmosphere. We have set up a webpage dedicated to keeping our user community up-to-date with any impacts on user operations.
This page can be found HERE.
However, CHESS offers much more than these expansive kits. With Next Generation Science Standards being implemented across New York State, teachers are working to understand the new methods and techniques in order to further improve STEM efforts statewide.