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\documentclass{beamer} | ||
\usepackage{float} | ||
\usepackage{listings} | ||
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\usepackage{amsmath} | ||
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\title[G4DMC]{Excessive Phonon Energy in G4DMC Events} | ||
\author{Rob Agnese} | ||
\institute{University of Florida} | ||
\date{February 27, 2017} | ||
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\begin{document} | ||
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\begin{frame}[plain, noframenumbering] | ||
\titlepage{} | ||
\end{frame} | ||
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\begin{frame}{The Problem} | ||
\vfill | ||
While debugging the track weighting discrepencies, I noticed that | ||
even without downsampling, we were getting too much energy out from a | ||
simulation. \\ | ||
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For an electron recoil we should expect: | ||
\begin{equation} | ||
E_{phonon} = E_{recoil} + 4 \textrm{volt} \times | ||
\textrm{floor}\left(\frac{E_{recoil}}{E_{pair}}\right) | ||
\end{equation} | ||
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For the 1 keV event I tested, that should be $\sim$ 2.4 keV. G4DMC collected | ||
a total of $\sim$ 3.1 keV of phonon energy. | ||
\vfill | ||
\end{frame} | ||
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\begin{frame}{Investigation} | ||
\vfill | ||
Some immediate consistency checks: | ||
\begin{itemize} | ||
\item Charge drift speeds still match data. | ||
\item Energy partitioner creates correct initial tracks (energies sum to $E_{recoil}$). | ||
\item Luke phonon emissions conserve energy on case-by-case basis. | ||
\end{itemize} | ||
\vfill | ||
\end{frame} | ||
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\begin{frame}{Tests} | ||
\vfill | ||
We have checked several potential sources of error: | ||
\begin{itemize} | ||
\item Use uniform electric field instead of COMSOL field - \textbf{no change}. | ||
\item Turn off inter-valley scattering (known to be non-physical) - \textbf{no change}. | ||
\item Create only phonons - \textbf{Correct energy output}! | ||
\item Shoot exactly one charge carrier pair - \textbf{Excess still present}. | ||
\end{itemize} | ||
\vfill | ||
\end{frame} | ||
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\begin{frame}{Places Left to Look} | ||
\vfill | ||
The bug must be in the charge physics. We've ruled out inter-valley scattering | ||
and Luke phonon emission. The drift curves also should rule out E-field | ||
acceleration bugs. There are three processes left: | ||
\begin{itemize} | ||
\item DriftBoundaryProcess - When a charge carrier is absorbed, releases | ||
its kinetic energy as phonons. | ||
\item DriftRecombinationProcess - When a charge carrier comes to rest | ||
in the crystal, it is killed and releases half of the gap energy | ||
as phonons. | ||
\item EnergyLimiter - When any particle is below its energy threshold, | ||
it is simply killed and deposits its kinetic energy as NIEL. This | ||
shouldn't be triggering ever for charge carriers as threshold = 0. | ||
\end{itemize} | ||
\vfill | ||
\end{frame} | ||
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\end{document} |