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Mater Sci Nanotechnol 2017 | Volume 1 Issue 2
allied
academies
Nanomaterials and Nanochemistry
November 29-30, 2017 | Atlanta, USA
International Conference on
Since it first became operational in 2007, the spallation
neutron source has utilized nanocrystalline diamond foils
to strip the electrons from a hydride ions (H-), converting
them into protons which collide with a mercury target to
produce the neutrons used in the facility. The nanocrystalline
diamond foils are grown on lithographically patterned silicon
wafers and the lower 2/3rd’s of the silicon is chemically
removed to produce a single edge supported foil (typically
17 mm x 30 mm x 1μm) with a silicon handle for mounting.
These foils have greater than 99% stripping efficiency,
as required by SNS, and have exceeded expectations in
durability, typically lasting over one month with exposure to
a>1 MW beam at 1 GeV energy. Results on the development
and use of nanocrystalline diamond stripper foils at SNS
will be presented, as well as laboratory studies of the
transformations that occur in crystalline structure, emissivity
and carbon state of the foils from deposition of beam energy
into the foil.
Speaker Biography
Dr. Charles Feigerle received a B.S. in Chemistry from the University of Illinois at
Chicago in 1977 and a Ph.D in Chemical Physics from the University of Colorado in
1983. Before joining the faculty of the University of Tennessee in 1985, he was a
National Research Council Postdoctoral Fellow and staff scientist at the National
Bureau of Standards (NBS). He has been the head of the Department of Chemistry
at the University of Tennessee since 2011. His research interests lie within the broad
umbrella of experimental physical chemistry, with emphasis on laser spectroscopy
and surface analysis for discovery and characterization of advanced and emerging
materials, including chemical vapor deposition of diamond and boron phosphide.
e:
Charles S Feigerle
University of Tennessee, USA
Nanocrystalline diamond as stripper foils in the spallation neutron source