83
Accurate
Numerical Models of the Secondary Electron Yield from Grazing-Incidence
Collisions--Tech-X
Corporation, 5621 Arapahoe Avenue, Suite A, Boulder, CO
80301; 303-448-0728, www.techxhome.com
Dr.
Dan T. Abell, Principal Investigator,
Dr.
John R. Cary, Business Official,
DOE
Grant No. DE-FG02-03ER83797
Amount:
$749,647
Interactions
with unwanted electrons are a major limiting factor in the performance of ion
accelerators. A main source of these
electrons is collisions at grazing incidence between the ions and the beam pipe
walls. Computer modeling could be
used to examine this problem, but the codes in the heavy-ion fusion community
presently do not have the capability to model grazing-incidence collisions
accurately. This project will
develop accurate numerical models of grazing-incidence collisions between ions
and walls. The improved models would
provide heavy-ion fusion simulation codes with an ability to determine ways for
mitigating the effects of unwanted electrons.
In Phase I, a model of surface roughness was implemented in an
ion-material interaction code, a model of electron yield was derived from the
surface roughness model, and the electron yield model was validated against
experimental results. Then, the
electron yield model was combined with a particle tracking code, and models of
ion scattering were developed based on ion-material interaction simulations. Finally,
a new code was prototyped to calculate electron yield from ion-material
interaction. In Phase II, tables of
data will be created for the ions, materials, energies, and angles important to
heavy-ion fusion; ion scattering and rough surface models will be added to a new
ion-material interaction code; and additional features (steering with a popular
scripting language, graphical user interface, computer-aided design) to
facilitate building and using the code will be added.
Commercial
Applications and Other Benefits as
described by awardee: Potential
commercial applications would include sales of an improved ion-material
interaction code to the health care industry.
In addition the expertise in gained in electron effects should provide
for potential consulting work in the accelerator industry.