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\begin{document}
\title{
RECENT DEVELOPMENTS IN ELECTRON CLOUD MODELING 
FOR TIME-RESOLVED SHIELDED PICKUP MEASUREMENTS 
OF ELECTRON CLOUD BUILDUP AT CESRTA
}
\author{J.A.~Crittenden, Y.~Li, X.~Liu, M.A.~Palmer, J.P.~Sikora\\ 
CLASSE\thanks{Work supported by the US National Science Foundation 
\mbox{PHY-0734867} and the U.S. Department of Energy \mbox{DE-FC02-08ER41538}},
Cornell University, Ithaca, NY 14850, USA\\*[2mm]
S.~Calatroni, G.~Rumolo\\
CERN, Geneva, Switzerland
\\*[5mm]}
%CERN, CH-1211 Gen\'eve 23, Switzerland
%\date{\today}
\maketitle
\begin{abstract}
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The Cornell Electron Storage Ring Test Accelerator (CesrTA) program includes 
investigations into the mitigation of electron cloud buildup using 
a variety of techniques in custom vacuum chambers. 
Two such chambers are equipped with pickup detectors shielded against
the direct beam-induced signal. 
The signals recorded by a digitizing oscilloscope provide time-resolved information 
on cloud development. 
Results for diamond-like carbon, amorphous carbon, and titanium-nitride coatings
have been obtained and compared to those for an uncoated aluminum chamber.
Here we report on extensions to the ECLOUD modeling code which refine its description
of a variety of new types of measurements, including the use of weak solenoidal fields
to characterize the cloud kinetic energy, as well as in situ vacuum chamber comparisons.
Our results highlight the sensitivity
afforded by these measurements to model parameters
such as the quantum efficiency for producing photoelectrons, 
their production location and energy distributions,
as well as to the secondary yield properties of the coatings, including differentiating 
determination of the true secondary, rediffused, and elastic yield values.
%%%%%%%
\end{abstract}
\end{document}






