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Component design description of the neutral beam injectors for PLT
Plasma heating by injection of high energy neutrals is one of the experiments to be carried out on Princeton Large Torus (PLT). A four unit neutral beam injection system has been designed, built and tested which should inject a total of 3 MW of neutrals into PLT with a 200 millisecond pulse length. A typical system unit is described where the major components are identified. The following discussion describes each of these items along with some details of the design and fabrication problems encountered. Some early design considerations addressed the problems of separation and dumping of residual ions from the neutral beam, calorimetry of the neutrals with incident fuxes of 25 KW/cm/sup 2/, and pumping speeds of several hundred thousand liters per second for hydrogen gas. Solutions were found for these problems while also resolving the complex dilemma of interfacing four large systems to a tokamak
Hydrocarbon separations in metal-organic frameworks
Owing to their high surface areas, tunable pore dimensions, and adjustable surface functionality, metal-org. frameworks (MOFs) can offer advantages for a variety of gas storage and gas sepn. applications. In an effort to reduce the major energy requirements for the sepn. of mixts. of light hydrocarbons via cryogenic distn., we are developing new MOFs with a high capacity for the selective adsorption of unsatd. hydrocarbons at higher temps. In particular, the compds. M2(dobdc) (M = Mg, Mn, Fe, Co, Ni; dobdc4- = 2,5-dioxido-1,4-benzenedicarboxylate), featuring open M2+ cation sites, have been evaluated for their performance in the fractionation of mixts. of C1-C3 hydrocarbons at 45 °C. The results indicate that these materials have significant potential for applications in adsorption-based processes for natural gas purifn. and olefin/paraffin spearations. In addn., it will be shown that certain structural features possible within MOFs, but not in zeolites, can enable the fractionation of hexane isomers according to the degree of branching or octane no.