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\large
%\vspace*{-0.5in}
\centerline {\bf 2.9\_V2.0 FULL BAKEOUT }
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 28,1999}\\
\noindent{\bf Filename: full\_bakeout} \\

\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\
\normalsize
BRIEF FUNCTIONAL DESCRIPTION:
The CCDs and the optical-blocking filter will develop a layer of
contamination with time as the SC outgasses.  ACIS is only exposed to
these contaminants after its door is opened during the OV phase (the
door then remains open for the rest of the mission).  The contaminants
are removed by heating the focal plane up to 30 C and allowing some
time for the materials to offgas from ACIS. The thermal time constants
are on the order of hours so this activity is currently projected to
take ~10 hours on orbit.  

Current thinking states that ACIS must be in the focal position for
this activity. The effectiveness (and therefore the required
frequency) of this activity is uncertain at this time.  Preliminary 
studies by TRW systems engineering indicates that this activity may be
required once every two weeks just after the door is opened, with 
declining frequency afterwards.  All these issues are highly uncertain
at the present time and will need to be vigorously reviewed in the
future.  

The sequence of actions will be:

\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item verify the initial Camera Body, Warm \& Cold Radiators and FP temperatures
\vspace{-0.10in}
\item enable FP bakeout and start heating FP to +30 
\vspace{-0.10in}
\item Enable and turn on the DA housing bakeout heater once the FP
temperature exceeds -60~C, heat DA housing to +25~C
\vspace{-0.10in}
\item Wait for FP temperature to stabilize at +30~C and Camera Body to
stabilize at +25~c
\ee


%\vspace{0.25in}
\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the instrument is in the canonical thermal standby state (the
FEPs and video boards must be off !!!!).\\

\vspace{0.25in}
\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize


%\newpage 

\vspace{0.25in}
\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize
{\em THIS PROCEDURE LEAVES THE INSTRUMENT IN BAKEOUT MODE, IT MUST BE
ROUTINELY MONITORED DURING THIS TIME.}\\
The little and  large vent valves must already be open. \\
The turning off of the FEPs and analog electronics should be verified
before the heaters are turned on. \\
{CARD ACIS-002} \\
{CARD ACIS-007} \\


\vspace{0.15in}
\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize
\noindent ACIS Long Form Functional Test Procedure (36-01301.01)

\normalsize
\noindent {\bf CHANGE HISTORY:} \\
\normalsize

{\bf V1.2}
\begin{itemize}
\item changed filenames from ``full\_bakeout\_cold'' to ``full\_bakeout''
\end{itemize}

{\bf V1.3}
\begin{itemize}
\item deleted commands in step 1 to turn on the housing heater on side
B
\item added HW TLM verifiers in step 1 to check the Camera Body, Warm
and Cold Radiators temperatures
\item moved start of a possibly needed DEA HKP run to step 1 from step
2
\item added a command in step 2.2. to disable warm boot in case the
BEP watchdog resets during the bakeout
\item added a sump system configuration command in step 2.6 
\item changed HW TLM verifiers in step 3.3 to 1CBAT and 1CBBT
\item deleted steps 5--7 which take the instrument out of bakeout and
moved them to a new procedure called ``full\_bkout\_off''
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item changed expected value of the cold radiator and the time
required in step 2.7
\item changed the expected value of the warm and cold radiators in
step 4.1
\end{itemize}


\newcommand{\tablecaptiontext}{Full Bakeout Procedure }
\input{full_bakeout.tab}

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