The following science pages will show how X-rays have become a mainstream tool for examining the structure and function of our material world, with an eye towards designing new materials, solving technological problems, and even curing diseases.
CHESS users come from around the world and represent both academic and corporate communities.
The National Science Foundation will support a “sub-facility” at CHESS. Other federal and state agencies, private foundations, academic institutions, and private industry will become partners, supporting and developing other portions of CHESS.
With a strong commitment to education, CHESS provides experiences to students, educators and the public that make science familiar and accessible.
The Cornell High Energy Synchrotron Source is a high-intensity X-ray source which provides our users state-of-the-art synchrotron radiation facilities for research in Physics, Chemistry, Biology, and Environmental and Materials Sciences.
X-ray attenuation/absorption data are from the NIST database.
A calculator program uses a simple model to calculate the X-ray flux from the diode current data. It includes an accepted model for electron-hole pair creation by X-rays in Silicon requiring 3.66eV energy per charge-pair. The model does not takes into account some of the seconary effects such as charge recombination and multiplication. The calculations are based on the one-dimensional model of the p-n junction working in photovoltaic mode (no-bias) taking into account photo-current generation originating from the depletion region and minority minority carrier diffusion from the space-charge-neutral region.
At station B2 with Ge <111> optics at 12keV.
The depletion layer was 53 microns, diffusion length: 0, count was 163909 cts at 1E-6 gain. The calculated flux: 1.47E10 ph/s.