Full spatial coherence is highly sought after because as a light source approaches that level of perfection, new x-ray probes and techniques become possible such as coherent diffraction imaging (CDI), x-ray photon correlation spectroscopy (XPCS), as well as enabling efficient focusing by Fresnel lenses to create diffraction limited beam-waists. One of the simplest ways to start thinking about coherence is to realize that the x-ray beam produced by a single electron passing through an undulator is completely coherent.
Ellipsoid shaped single-bounce glass capillaries fabricated at CHESS have been used as achromatic X-ray focusing optics for various applications at synchrotron beamlines, such as microbeam X-ray fluorescence and tomography, confocal X-ray microscopy, microbeam small-angle X-ray scattering (µSAXS), microbeam high-resolution X-ray diffraction and standing wave technique, high pressure studies with diamond anvil cells, microbeam grazing-incidence wide-angle X-ray scattering (µGIWAXS), full-field transmission X-ray microscopy (TXM), X-ray emission spectroscopy and microcrystallography.
The first workshop of its kind was hosted by the American Association for the Advancement of Science, aimed at helping science educators understand how these national science standards will impact K-12 education. NGSS encompass an ongoing science education reform initiative launched in the late 1980's aimed at improving the quality, relevance and availability of STEM. NGSS represent a set of goals for our nation, outlining what educators expect students to be able to do and understand after completing secondary school, building a foundation for their post-secondary education in STEM.
The crews are currently working in concert with each other, moving from east to west through the L-0 experimental hall. When a new magnet assembly goes in, the crews place a new portion of shielding wall, then a new front end assembly, followed by utilities and more portions of shielding wall - creating a dance that requires strict planning while donning steel-toed boots.
An all-diamond X-ray position and flux monitor using nitrogen-incorporated ultra-nanocrystalline diamond contacts
The extraordinary properties of diamond, such as radiation hardness and high thermal conductivity, make it an ideal material for synchrotron X-ray radiation detectors. The heart of the detector is based on a high purity single crystal diamond in the shape of a small square wafer approximately 0.1 - 0.5 mm thick.
For example, while inorganic forms of arsenic (e.g, As3+ and As5+) are known to be highly toxic agents, arsenobetaine (AsB) and arsenocholine (AsC) are relatively non-toxic, organoarsenic species that are considered benign. Both AsB and AsC are absorbed into the blood compartment and excreted unchanged in urine.
The program has matured over the last two years to the point where we are now commercializing the production of small, inexpensive, novel undulators and planning to upgrade as many CHESS beamlines as possible with more brilliant sources.
His current position at CHESS is "project scientist." Peter has played a key role in designing a new type of x-ray monochromator that provides uniquely flexible capabilities to focus high photon energy (40-100keV) beams to feed the F2 station. We've highlighted the new hardware capabilities previously .
A range of exciting NanoDays programs will demonstrate the special and unexpected properties found at the super tiny nanoscale; examine tools used by nanoscientists; showcase nano materials with spectacular promise; and invite discussion of technology and society.
Nanomaterials are extremely small objects (a nanometer is a billionth of a meter!). Synchrotrons are complex, giant machines, often covering an area the size of a football field. Frequently, however, these two worlds collide in an effort to understand the unusual properties that nanomaterials exhibit over their “bulk” counterparts. Dr. Ward will share stories of scientific collaboration—how scientists work together in order to apply Big Science to tackle Small Problems.
With Dr. Matthew Ward, a post-doc at the Cornell High Energy Synchrotron Source (CHESS)