Design of the Fill/Transfer Station Cryostat for the Omega Cryogenic Target System
General Atomics is designing, testing and fabricating a system for supplying cryogenic targets for the University of Rochester’s OMEGA laser system. A prototype system has demonstrated the filling of 1 mm diameter, 3 μm wall plastic spheres to 111 MPa (1100 atm) with deuterium and then cooling to 18 K to condense the fuel. The production design must be capable of routinely filling and cooling targets with a 50/50 mix of deuterium and tritium and transferring them to a device which places the targets into the focus of 60 laser beams. This paper discusses the design and analysis of the production Fill/ Transfer Station cryostat. The cryostat has two major components, a fixed base and a removable dome. The joint between the base and the dome is similar to a bayonet fitting and is sealed by a room temperature elastomeric o-ring. Since the cryostat must be housed in a glovebox, its design is driven strongly by maintenance requirements. To reach the equipment inside the cryostat, the dome is simply unbolted and lifted. The inside of the cryostat is maintained at 16 K by a closed loop helium flow system. Gaseous helium at about 1.4 MPa (200 psi) flows through tubes which are brazed to the inner walls. Cooling is provided by several cryocoolers which are located external to the cryostat. Liquid nitrogen is used as a heat intercept and to precool the helium gas.
KeywordsCryogenic Temperature Target Manipulator Flow Loop Pressure Relief Valve Thermal Shield
Unable to display preview. Download preview PDF.
- 1.N.B. Alexander et al., The Cryogenic target handling system for the OMEGA laser, Proc. of the 16th IAEA Fusion Energy Conf., Montreal, Canada 1996 (International Atomic Energy Agency, Vienna, to be published).Google Scholar
- 2.G. E. Besenbruch et al, Testing of the cryogenic target handling system for the OMEGA laser, Proc. of the 19th Symposium on Fusion Technology, PF52 (1996).Google Scholar
- 3.R.H. Boonstra et al, TAC2D a general purpose two-dimensional heat transfer computer code — user’s manual, General Atomics Report GA-A14032 (1976).Google Scholar