Permeation of helium and hydrogen from glass-microsphere laser targets

Journal Article · Sat May 01 04:00:00 EDT 1976 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.322924· OSTI ID:7194657

Tsugawa, R T; Moen, I; Roberts, P E; Souers, P C

Isothermal outgassing curves of hollow glass microspheres filled with helium, hydrogen, or deuterium gas have been determined. Four million 40--45-..mu..m soda-lime glass microspheres, similar to laser-fusion targets, were filled by gas permeation at 693--763 K and outgassed at 292--573 K. The permeabilities were calculated by an exponential theory, and they agree to an order of magnitude with the literature values. The outgassing curves are not pressure dependent. Two irregularities are apparent. First, the counting of target-quality individual D-T--filled microspheres shows a permeability spread of an order of magnitude from one microsphere to the next, which may be caused by variable chemical composition. Second, all the gases show deviations from exponential behavior in the form of tails at long times. Chemical reaction of the hydrogen with the glass, as well as incomplete filling and outgassing, may cause the hydrogen tails; the cause of the helium tails is not known. (AIP)

• Research Organization: University of California, Lawrence Livermore Laboratory, Livermore, California 94550
• OSTI ID: 7194657
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 47:5; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
CRYOGENIC FLUIDS
DEGASSING
DEUTERIUM
ELEMENTS
FLUIDS
GLASS
HELIUM
HYDROGEN
HYDROGEN ISOTOPES
IMPLOSIONS
ISOTOPES
LASER IMPLOSIONS
LIGHT NUCLEI
MICROSPHERES
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PERMEABILITY
RARE GASES
STABLE ISOTOPES
TARGETS