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    STUDIA PHYSICA - Ediţia nr.2 din 2005  
         
  Articol:   HEAT GENERATION AND TEMPERATURE PROFILE IN IBA CYCLOTRON TL-TARGETS FOR HOMOGENEOUS TARGET CURRENT DENSITY.

Autori:  PIERRE VAN DEN WINKEL.
 
       
         
  Rezumat:  The use of a cylindrical collimator in stead of a square one, for IBA cyclotron. Tl-targets reduces the maximum target current by a factor 1,49. In any case the beam current density on target is limited to 0,493 A.mm-2. Taking into account the  (6) beam target geometry, the maximum current density at the collimator cross section area is donne for a gaussian current distribution. The reduction of the thickness of the Cu carrier to 0,5 mm allows the total target current to increased to 495 A (cylindrical collimator) and to 738 A for a square collimator, total target current in case of homogeneous irradiation i.e. a factor of 1,91 higher then when a cylindrical collimator and 2 mm Cu-backing are used. The sophisticated fin-fitted target carrier can be replaced by a simple flat backing: the cross sectional area O equals 0,300 cm2 for a channel width of 2,5 mm, an area that is really equal to that of the fin-fitted version (O = 0,317 cm2). Due to the reduced surface area of the ellipse, the total target current is limited to 495 A. At the collimator outlet plane the maximum current density equals 6,31 A.mm-2. Reducing the Cu backing from 2 mm to 0,5 mm and doubling the flowrate of the coolant allows the current density to be increased by a factor 1,96. At the collimator exit plane the maximum current density equals 9,65 A.mm-2.  
         
     
         
         
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