JET-P(95)13

Performance of Hypervapotron Beam Stopping Elements in JET

Rectangular Hypervaptron beam stopping elements made from CuCrZr have been used in the JET Beam Injectors to dissipate up to 100MW of power. Experience over more than 10 years is outstanding with not a single failure. At the flow velocities used in the Hypervapotron elements of the JET injectors the turbulence created by the fins dominates the heat transfer and the Hypervapotron mechanism is of secondary importance. The main advantage of the Hypervapotron is the geometrical flexibility. The surface can be shaped freely as required without compromising on either heat transfer or total power handling capability. Flow velocity and flow rate can be independently adjusted to requirements. Peak power densities up to 30MW/m2 have been removed at a flow velocity of 7m/s and a pressure drop of 0.25MPafm2 . Flow parameters were: velocity ≤11m/s, inlet pressure ≤l MPa, inlet temperature ≤50°C.
Name Size  
JETP95013 1.60 Mb