Minutes of February 11, 2003 DRAGON meeting 


 Present:  JDA  DH DO (recorder)  JR SE CN SB DG AB AL AO 
           CW LB CJ 

 Minutes of February 4th accepted without change. 

 Status Reports 

 DH  Target wheel.  The square wheel version has been mocked 
     up as a model and works admirably well.  However, due to 
     psychological resistance a chain drive version is being 
     designed.  The target ladder is for solid targets for 
     the 12C(12C,gamma)24Mg experiment. 
    
     Faraday Cup, needs lathe work and completion time will 
     be known today. 

     Beam profile monitor, the cable is complete and will need 
     to be pulled into place this week. 

     HV Conditioning, on initial test seems to be working as 
     specified, increasing in 20V steps. 

     CCD camera,  still awaiting permanent software, operates 
     in sequence mode, will give profiles but calulation of 
     centroids etc needs modification. 

 CN  Website.  There is a new forum message board available 
     10 people have registered so far.  People need to click 
     on the subscribe button.  There  was discussion of the need 
     for password controls.  Non Triumf people to access the 
     DAQ will need passwords.   

     It was decided to add pictures of the collaborators to the 
     website. 

 AO  The data acquisition system has been moved to ISDAQ04. 
     MIDMES01 continues to handle the front end stuff only. 

 JDA Stable Beam request has been submitted to JMP. (attached) 
     There are presently tests of 12C 2+ beam to test how long 
     the stripper will last. 

 DG  Gamma ray efficiency. 4 options talked about. 
     1. 3X3 NaI and published curves to calibrate our sources. 
     2. 16O(alpha,gamma) published data using 5.5MeV gamma and 
        1.2 MeV cascade. 
     3. Calibrate at low energy and trust GEANT to extrapolate 
        to high energy. 
     4. Transport our BGO to a Van de Graaff and use their techniques 
        to get an intrinsic efficiency. 

 CW  Practise talk for WRNC "DRAGON Focal Plane Detector System"