The coupling of a shock tube to a time-of-flight mass spectrometer for the determination of kinetic data is described whereby analysis is performed every 25 μsec. The rate of dissociation of Cl2 has been measured over the temperature range 1700°—3200°K under essentially isothermal and isobaric conditions with the observed rate constants in fair agreement with those obtained by the spectroscopic technique. The observed temperature dependence is less than predicted by simple collision theory with an apparent activation energy of 41±5 kcal/mole.
Thin solid samples of deuterium–tritium (DT) have been seen to sublime and redistribute within spherical inertial fusion targets due to the heat generated by beta decay. We have frozen thin DT samples within glass shells of 890 and 3750 μm diameter, and observed the evolution of the solid towards more symmetric distributions using real time holographic interferometry. Holographic interferometry provides more sensitivity than direct imaging or classical interferometry to observe the thin (10–30 μm) solid samples in these shells.
To take full advantage of the capabilities offered by the Omega laser facility, the experimental teams at the University of Rochester need the capability to field cryogenic targets. The cryogenic target delivery system must be able to produce uniform solid or liquid DT layers 2-20 pm within polymer shells which are 300-400 fim in diameter. The facility must be able to maintain its experiment rate of one shot per ~ h and each target must be documented within the experimental chamber for postshot analysis. We will discuss the approach and equipment that KMS is using in collaboration with the University of Rochester to provide Omega with the capability to field cryogenic inertial confinement fusion targets.
We have recently installed a real-time holographic interferometry system on one of our experimental vacuum chambers. This system, which utilizes an argon laser at 488.0 nm and a Newport Research HC-300 holographic camera, will be used to develop and document liquid layer targets for inertial confinement fusion experiments. An interference image is produced when the image of a liquid layer target is superimposed on the stored holograph of the same target with the fuel held in the gas phase. This real-time interference image is due to the change in the fuel state and is a direct measure of the liquid layer uniformity. Routine use of this imaging system will allow us to develop the techniques needed to produce acceptable liquid layers in targets 1–2 mm in diameter with walls 5–50 μm thick. We will discuss the techniques and configuration used to adopt this system for the vibration noise inherent in an experimental chamber.
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