| Paper | 
        Title | 
        Page | 
    
    
        | PT08 | 
        A fast protection system for narrow-gap insertion device vessels
         | 
        174 | 
    
    
        |   | 
        
                - M.J. Dufau, R.J. Smith
 
                       CLRC, Daresbury Laboratory, Warrington, UK 
          | 
          | 
    
        
            |   | 
            
            Presented in this paper are details of an electronic,
            beam position based interlock system, which has been
            designed to protect narrow - gap insertion device vessels
            from the thermal damage that would result from mis
            steered beam. Details of system design and operational
            experience are presented, and the paper concludes with an
            outline proposal for a system enhancement, that would
            offer diagnostic information immediately prior to an
            excessive beam displacement trip.
             | 
              |