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\title{SVT requirements for slow controls}

\author{Sho Uemura}
%\institute{SLAC}
\date[December 5, 2013]

\begin{document}

\begin{frame}
	\titlepage
\end{frame}

\begin{frame}{SVT subsystems}
	\begin{itemize}
		\item Voltages
		\item Interlocks
		\item Cooling
		\item Motion
	\end{itemize}
\end{frame}

\begin{frame}{Voltages}
	\begin{itemize}
		\item MPODs supply HV directly to sensors, LV to frontend and flange boards
			\begin{itemize}
				\item Standard equipment at JLab; MPODs are controlled over SNMP and EPICS interface exists (MPOD testing and integration: Sho and Pelle)
				\item Requirements: On/off and voltage control, voltage and current readout
			\end{itemize}
		\item Regulators on frontend boards supply LV to hybrids
			\begin{itemize}
				\item Frontend boards controlled by DAQ; EPICS CA server to be implemented by SVT DAQ group (Ryan)
				\item Requirements: On/off control (voltage setpoints fixed), voltage and current readout, watchdog timer
			\end{itemize}
		\item SVT voltage GUI from test run is a good starting point; probably want more automation and sequencing
	\end{itemize}
\end{frame}

\begin{frame}{Interlocks}
	\begin{itemize}
		\item Requirements: protect SVT with response time <1 second, record and monitor conditions
			\begin{itemize}
				\item Loss of vacuum
				\item Loss of cooling/break in a cooling line
				\item Beam accident
			\end{itemize}
		\item Inputs:
			\begin{itemize}
				\item Vacuum chamber pressure and temperature
				\item Beam FSD signal
				\item Coolant temperature (RTDs at inlet and outlet)
				\item Coolant flowmeter
				\item Software input from EPICS
			\end{itemize}
		\item Outputs:
			\begin{itemize}
				\item SVT power: interlock input on MPOD chassis controller
				\item SVT cooling: solenoid valve at inlet (outlet has check valve)
			\end{itemize}
		\item Use Allen-Bradley PLC --- flexible, used at JLab, can read out all inputs and status to EPICS
		\item Logic and procedures by SLAC SVT group (Pelle, Sho)
	\end{itemize}
\end{frame}

\begin{frame}{Cooling: chiller and SVT temperatures}
	\begin{itemize}
		\item Single chiller (Affinity P-series) for all SVT heat loads (hybrids and frontend boards)
		\item RS-232 control through EPICS
			\begin{itemize}
				\item Requirements: setpoint control, alarm status readout, possibly other internal sensors
				\item Interlock functions (external sensors and isolation valves, automatic low level shutoff) do not rely on RS-232
			\end{itemize}
		\item Setup and testing (including RS-232 control) at SLAC (Marco)
		\item Hybrid and FE temperatures from thermistors are read by SVT DAQ and CA server (Ryan)
			\begin{itemize}
				\item Interlock does not rely on this
			\end{itemize}
	\end{itemize}
\end{frame}

\begin{frame}{Motion}
	\begin{itemize}
		\item Linear stages for SVT top, SVT bottom, target (requirements for target discussed under beamline talk)
		\item Requirements: control position, readout rotary encoder and contact switches (in-limit and out-limit)
		\item Reproducible (25 $\mu$m at layer 1) and adjustable run position
		\item Wire scans using wires on SVT
		\item Stages already in hand but need to be tested at SLAC (Takashi, Sho); need JLab motor drivers and EPICS-in-a-box system
	\end{itemize}
\end{frame}

\appendix

\begin{frame}
	\begin{centering}
		\includegraphics[page=1,width=0.9\textwidth]{2013-11-27-slow-control-review-power}
	\end{centering}
\end{frame}

\begin{frame}
	\begin{centering}
		\includegraphics[page=1,width=0.9\textwidth]{2013-11-27-slow-control-review-cooling-power}
	\end{centering}
\end{frame}

\begin{frame}
	\begin{centering}
		\includegraphics[page=1,width=0.9\textwidth]{SVT-Cooling}
	\end{centering}
\end{frame}

\begin{frame}
	\begin{centering}
		\includegraphics[page=2,width=0.9\textwidth]{SVT-Cooling}
	\end{centering}
\end{frame}

\begin{frame}
	\begin{centering}
		\includegraphics[page=1,width=0.9\textwidth]{svt_mover}
	\end{centering}
\end{frame}

\begin{frame}
	\begin{centering}
		\includegraphics[page=2,width=0.9\textwidth]{svt_mover}
	\end{centering}
\end{frame}

\begin{frame}
	\begin{centering}
		\includegraphics[page=3,width=0.9\textwidth]{svt_mover}
	\end{centering}
\end{frame}

\end{document}