Poster

poster.tex

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\usepackage[size=custom,width=107,height=122,scale=2]{beamerposter}
\usetheme{LLT-poster}
\usecolortheme{ComingClean}
% \usecolortheme{Entrepreneur}
% \usecolortheme{ConspiciousCreep}  %% VERY garish.
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\usepackage{units}
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\usepackage{libertine}
\usepackage[scaled=0.92]{inconsolata}
\usepackage[libertine]{newtxmath}

\author[jcaron@uh.edu]{Jean-Fran\c{c}ois Caron$^{1}$, Fawzi Abusalma$^{2}$, and Gabe Cobos$^{2}$}
\title{\Huge Computer Control of a Droege Power Supply}
\institute{$^{1}$University of Houston, $^{2}$University of Minnesota}
% Optional foot image
\footimage{\includegraphics[width=8cm]{UH_Red}}

\begin{document}
\begin{frame}[fragile]\centering

\begin{columns}[T]

%%%% First Column
\begin{column}{.48\textwidth}

\begin{block}{Overview}
We modified the venerable Droege-designed high-voltage power supply to allow for remote control with a modern computer.

% \begin{itemize}
% \item This is the template I created for my poster presentations.
% \item You can provide an optional \verb|\footimage|.
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\begin{figure}
\centering
 \includegraphics[height=20cm,clip=true,angle=0,trim = 670 20 740 280]{figures/front_device.jpg}
 \includegraphics[height=20cm,clip=true,angle=0,trim = 700 130 800 580]{figures/rear_device.jpg}
 \hspace{1cm}
 \includegraphics[height=20cm]{figures/TomDroege.jpg}
 \caption{Left: Front and rear panels of Droege supply, before modification.\\Right: The late Tom Droege posing with his power supplies.}
\end{figure}

The Droege design has many advantages:
\vspace{1cm}
\begin{itemize}
\item As a NIM module, it is very robust and easy to use.
\item Discrete components make it easily repairable or modifiable.
\item It is very stable and fast-tripping, for use with wire chambers.
\item There is are \textbf{analog remote control pins} on the back panel.
\item All the ``monitor'' voltages also appear on the back panel.
\end{itemize}
\end{block}


\begin{block}{Modifications}
There are a few problems with trying to use the analog remote control pin directly.
\vspace{1cm}
\begin{description}
  \item[Physical:] The pin connector is of a difficult-to-find model.
  \item[Digital:] The signals are all analog, so ADCs and DACs are required.
  \item[Analog:] The voltage levels are not convenient for modern chips.
\end{description}
\vspace{1cm}

Our solution to the physical problem is to duplicate each pin with 0.1-inch male headers so that we can connect a ribbon cable.
\begin{figure}
% left, bottom, right, top
 \includegraphics[height=20cm,clip=true,angle=0,trim = 700 0 725 0 ]{figures/outside_mod.jpg}
 \includegraphics[height=20cm,clip=true,angle=0,trim = 0 0 0 0]{figures/inside_mod.jpg}
 \caption{Add-on header pin connector epoxied to a slot cut in the rear bulkhead.}
\end{figure}
\end{block}


% \begin{block}{Colour Themes}
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% \item I've included some colour themes, using the colour palettes from 
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% \item ComingClean (current theme)
% \item Entrepreneur (light blue + grey)
% \item Conspicious (a bit garish!)
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\end{column}

%%%% Second Column
\begin{column}{.48\textwidth}

\begin{block}{Adaptations}
%\begin{itemize}
\begin{figure}
 \centering
 % left, bottom, right, top
 \includegraphics[height=20cm,clip=true,trim = 250 160 200 170]{figures/Droege_Control.pdf}
 \includegraphics[height=20cm,clip=true,trim = 800 100 400 250,angle=-90,origin = c]{figures/board_and_arduino.JPG}
 \caption{Left: Circuit diagram for level shifter and monitor amplifiers.\\Right: Prototype board with amplifiers and Arduino Due.}
 \end{figure}

 We built a voltage adapter board to adjust the voltage levels to match the range of an Arduino Due microcontroller's ADCs and DACs.  We had to shift the DAC output down, invert the voltage monitor output, and amplify the current monitor output. 
%\end{itemize}
\end{block}


\begin{block}{Calibration}
The following relations had to be determined by hand using two high-quality digital multimeters:

\begin{description}
\item[Voltage Monitor] analog voltage monitor and the actual high voltage ($V_{\text{mon}} \rightarrow V_{\text{HV}}$), for voltages up to $\unit[1000]{V}$;
\item[High Voltage Setting] analog voltage monitor and Arduino Due DAC1 counts ($V_{\text{mon}} \rightarrow C_{\text{DAC1}}$);
\item[Voltage Monitor] Arduino Due ADC0 counts and analog voltage monitor ($C_{\text{ADC0}} \rightarrow V_{\text{mon}}$);
\item[Current Monitor] Arduino Due ADC1 counts and derived current ($C_{\text{derived}} \rightarrow I_{\text{mon}}$);
\end{description}

The derived current was obtained by connecting a high-value resistor across the end of a severed SHV cable.  Knowing the resistance to a good accuracy, we can derive the current.

\newcommand{\Rtot}{{\fontfamily{cmr}\selectfont$\unit[125\pm1]{M\Omega}$}}
\begin{figure}
\centering
 \includegraphics[height=20cm,clip=true,trim = 600 400 400 500]{figures/resistor.JPG}
 \caption{\label{resistor}\Rtot\ resistor at the end of an RG-59 B/U cable, connected to the high-voltage output of the Droege.}
\end{figure}

\end{block}


\end{column}
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% \begin{itemize}
% \item One, two, pick up my shoe
% \item Three, four, shut the door
% \item Five, six, pick up sticks
% \item Seven, eight, lay them straight
% \item Nine, ten, a big fat hen
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\end{document}