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\documentclass{chowto}

\title{HKS Target Ladder Exchange}
\howtotype{expert}
\experiment{HKS} % Optional
\author{Liguang Tang}
\category{target} % Subject area of this document
        % Allowed choices are
        %
        % hms             HMS detectors and other HMS stuff (eg rotation)
        % sos             SOS detectors and other SOS stuff i(eg doors)
        % magnet          SOS/HMS or other magnet systems
        % beamline        Beamline instrumentation
        % daq             Data Acuisition and Analysis
        % electronics     
        % target   
        % general         All other subjects

%\maintainer{Name of person maintaining document} % Optional
\date{March 25, 2005}

\begin{document}

\begin{abstract}
This Howto outlines the purpose of the HKS target ladder and the
strict procedure of exchanging the ladder.
\end{abstract}
 
\section {Purpose}
The HKS target ladder is used to hold solid targets for the HKS
experiment. Each ladder can offer 6 target positions.  During the
experiment, if more than 6 targets are needed, exchange target ladders
during the experiment is required.

Due to radiation after long target exposure to the beam and possible
contamination on the Aluminum target ladder surface, this exchange is
a {\bf special operation} which requires authorized persons only, temporary
work permit, and RADCON personal assistance.

\section {Procedure to exchange target ladder}
The entire procedure contains two parts: pre-preparation ahead of time
and operation.

Pre-preparation:
\begin {enumerate}
\item Before experiment, RADCON group must be informed and discussion must 
      be made to establish understanding on the operation requirements, possible 
      radiation and contamination conditions, develop various procedures under 
      different conditions. 
\item All required tools and new ladder must be prepared.
\item For authorized persons, practice must be done before experiment to be clear 
on operation and time required to complete the operation.
\item Temporary Operation Work Permit must be prepared, describe the required 
operation and work procedures, required time length, identify possible 
radiation/contamination conditions and corresponding protection/treatment
procedures.

\item RADCON group must be involved in the operation and authorization process.
\end {enumerate}
Operation:
\begin {enumerate}
\item RADCON personal must first survey the target and exchange operation area to 
establish radiation level map.
\item The TOWP must be re-examined to confirm the procedure and tools in control 
       the radiation and possible contamination is in good stand, required time is still 
       allowed, and operation is well prepared, then authorized by RADCON to 
       proceed.
\item If TOWP must be modified before proceed, modification must be done first.
\item Before operation the ladder must be retrieved to all the way out position.
\item The target ladder vacuum isolation valve must then be close manually.
\item Unscrew the screws on the target ladder flange at the end of the driver.
\item Pull the target ladder out.
\item RADCON personal swaps the ladder to examine the possible contamination
on the ladder surface and decide how to treat the ladder which was previously 
in the beam.
\item Put new ladder into the driver and put screws back on.
\item Slowly or in steps open the isolation valve until all the way open.
\item During operation, avoid unnecessary standing and waiting around the target 
      area.
\end {enumerate}

\end{document}

% Revision history:
% $Log: HKS-target-ladder-exchange.tex,v $
% Revision 1.1.2.1  2005/05/13 13:42:07  saw
% Initial version
%