Temperature-dependent tensile strength, surface roughness diagnostics, and magnetic support and positioning of polymer ICF shells. Final report, April 17, 1995--July 31, 1996
The research carried out under this grant is a continuation of some of the authors previous experimental work on ICF target shells which focused on emissivity properties over a large temperature range, and on magnetic properties which could lead to successful levitation of target shells. Former methods in which contact-less shell temperature determination was achieved by accurate measurements of shell permeation rate are not workable at temperatures below about 230K, since the permeation rate becomes too slow. A new method explored here for emissivity determination at lower temperatures than in the preceding studies utilizes visual observation of phase changes between the liquid and gaseous phases as the shell warms up under the influence of black-body radiation absorption. The apparatus for this method was modified from its previously form by using cold flowing gas as coolant rather than a liquid N{sub 2} bath. Two gases, argon and methane, were principally employed. While the actual emissivities were not accurately measured here, proof of the method was established. CH{sub 4} (methane) gives the best results, thus extending the temperature range of emissivity determination down to about 140K. For emissivity determinations at still lower temperatures, another method discussed in previous work provides contact-less temperature measurement via the Curie law through measurements of the magnetic susceptibility using electron spin resonance (ESR). Current work showed some interesting distinctions among variously doped shells, but otherwise the results of the preliminary work carried out at the end of the previous grant were confirmed.
- Research Organization:
- Syracuse Univ., NY (United States). Dept. of Physics
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-95SF20720
- OSTI ID:
- 531094
- Report Number(s):
- DOE/SF/20720-T1; ON: DE97009393; TRN: 97:019414
- Resource Relation:
- Other Information: PBD: 15 Aug 1997
- Country of Publication:
- United States
- Language:
- English
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