% our theorists, on DM-e scattering in Si: https://arxiv.org/pdf/1509.01598.pdf
% DOE BRN: https://science.osti.gov/-/media/hep/pdf/Reports/Dark_Matter_New_Initiatives_rpt.pdf
% PDG DM: https://pdg.lbl.gov/2020/reviews/rpp2020-rev-dark-matter.pdf
% last SENSEI: https://arxiv.org/pdf/2004.11378.pdf


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\usepackage{hyperref}
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\title{Operation procedures}

\author[Sho Uemura]{Sho Uemura}
\institute{Tel Aviv University\\for the SENSEI Collaboration}
\date[July 28, 2021]

%\titlegraphic{
%\includegraphics[height=0.1\textheight]{SLAC_Logo}\hspace*{4.75cm}~
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\begin{document}

%\setcounter{framenumber}{2} 
\begin{frame}
    \titlepage
\end{frame}

%agenda:
%response to IRR
%commissioning+ops
%ops procedures
%quality+emergency response plans
%health/safety + hazard management plans

%The ORR meeting is relatively short with a focus on Operations (normal and emergency conditions) and hazard management.
%
%Avoid background information on the experiment as this was previously presented (the committee members are all familiar with SENSEI).
%
%General questions worth noting through presentations:
%
%Verify the actual installation matches the planned installation (photos help – I’ve asked the installation team to grab some new photos)
%If any changes were made, are the changes significant, documented?
%I don’t think there were any major changes
%Do we have as-built drawings?
%Drawings are not necessarily as-built owing to the relatively small scope of SENSEI, quality management plan (including trial assembly and system test at Fermilab) used to confirm apparatus was made as-per drawings
%Are the operating procedures fit-for-purpose
%Walk through the operating procedure and emergency procedures – highlight that the experiment has only a few key pieces of energized equipment, is straightforward to shut down, review any potential risks to detectors if experiment is shut down (and special precautions etc).
%If somebody were to walk by an obviously malfunctioning apparatus, what should they do?
%What does normal operation look/sound/smell like (important for SNOLAB LRCs who walk through lab start of every shift)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{frame}{Summary of SENSEI}
    \begin{itemize}
        \item System state is well defined by the main components:
            \begin{itemize}
                \item Vacuum: pump running? vessel under vacuum, or at atmosphere?
                \item Cooling: cryocooler running? CCDs cold, or at room temperature?
                \item DAQ: LTAs powered? CCDs biased, or not?
            \end{itemize}
        \item Each component requires the previous one:
            \begin{itemize}
                \item Cryo may only be started if the CCDs are under good vacuum (otherwise they can be damaged by condensation)
                \item CCDs may only be biased if cold (otherwise they can be damaged by excessive charge buildup)
                \item Note these are requirements for protecting equipment, not for safety
            \end{itemize}
        \item The safest state for SENSEI (for power outages or extended down) is vacuum on, cryo+DAQ off
    \end{itemize}
\end{frame}

\begin{frame}{Normal running}
    \begin{itemize}
        \item Vacuum pump should always be on, cryocooler normally on but may be turned off for tests or temperature cycling
        \item Vacuum pump on: high-pitched whine from turbopump, rumble from rough pump (if running)
        \item Cryocooler on: 1 Hz shoomp-shoomp-shoomp
    \end{itemize}
\end{frame}

\begin{frame}{Controls and monitoring}
    \begin{itemize}
        \item Vacuum and temperature are monitored, with logging and notifications
        \item Cryocooler, temperature controller, and DAQ are under remote control, vacuum is not
        \item SENSEI has two states:
            \begin{itemize}
                \item Online: vessel is under vacuum, cryocooler and DAQ are ready for remote control
                \item Offline: vessel is at atmosphere, cryocooler is switched off locally, ready for maintenance
            \end{itemize}
        \item Remote operations are simple, the SENSEI procedures are oriented towards local operations and setting things up for remote ops
    \end{itemize}
\end{frame}

\begin{frame}{Operation procedures}
    \begin{itemize}
        \item Startup and shutdown procedures are used for bringing SENSEI online and offline
            \begin{itemize}
                \item No training assumed, procedures are self-contained
            \end{itemize}
        \item Emergency shutdown will be covered in next talk
        \item Installation procedure will be used for maintenance (replacement or addition of inside-vessel components)
            \begin{itemize}
                \item This requires the same training in ESD-safe CCD handling as the installation
            \end{itemize}
    \end{itemize}
\end{frame}

%\begin{frame}{The SENSEI CCDs}
%    \begin{columns}
%        \column{0.5\textwidth}
%        \begin{itemize}
%            \item High-resistivity silicon $675$ $\mu$m thick (no backside thinning), active area $1.59\times 9.42$ cm$^2$ (1.925 grams)
%            \item $6144\times 886$ pixels (split in 4 quadrants), 15 $\mu$m pitch
%            \item Largely identical to DAMIC
%                \begin{itemize}
%                    \item Same material, processing, pixel geometry
%                    \item Different overall dimensions, readout
%                \end{itemize}
%                %\item Designed by LBNL MSL, fabricated by Teledyne DALSA
%            \item Huge improvements (in dark current and amplifier luminescence) over previous SENSEI CCDs fabricated parasitically on lower-quality silicon
%        \end{itemize}
%        \column{0.5\textwidth}
%        \includegraphics[width=\textwidth]{ccds}
%    \end{columns}
%\end{frame}

%\appendix
%\backupbegin

%\backupend

\end{document}