At 7:11 PM 2/6/5, Frederick Sparber wrote: >The melting point of Lithium Hydride (LiH) is 680 C with a vapor >pressure of ~ 25 Torr. > >Differential Pumping requirements will be minimal if the Self-Sealing "Window" >on a 304 stainless steel capsule of Lithium Deuteride (LiD) or LiH doesn't >function as expected >using a Self-Healing Nickel "Window" where a 5 -10 milliampere, 75 to 200 Kev >electron beam is employed to create an intense plasma cavity in the >Deuteride-Hydride. > >This can be tried in any local Electron Beam Welding (EBW) Job Shop.
You can always try aluminum loaded with H or D, as Kamada et al did in the two experiments described below: The 1992 (Kamada) results showed 1.3 MeV or greater 4He (about 80 percent) and 0.4 MeV or greater P (about 20 percent) tracks using Al loaded with *either* H or D. The electron beam energy used was 200 and 400 keV. H3+ or D3+ ions were implanted with an energy of 90 keV into Al films. The implantation was done at a fluence of 10^17 (H+ or D+)/cm^2 using a Cockcroft Walton type accelerator. The Al foil used was would pass 200 keV electrons. It was bombarded in a HITACHI HU-500 with a beam current of 300 to 400 nA with a beam size of roughly 4x10^-5 cm^2, or (4-6)x1016 e/cm^2/s flux electron beam. The area the beam passedthrough was roughly 2x10^-3 cm^2. Total bombarding time was 40 m. The Al target was a 5 mm dia. disk 1 mm thick, but chemically thinned. The particle detectors were 10 mm x 15 mm x 1 mm CR-39 polymer plastic detectors supplied by Tokuyama Soda Co. Ltd. Great care was taken to avoid radon gas exposure. Detectors were set horizontally on either side of the beam 20 mm above the target and two were set vertically one above the other 20 mm to the side of the target but starting at the elevation of the target and going upward (beam source upward from target). The detectors were etched with 6N KOH at 70 deg. C for 2 h. at a rate of 2.7 um/h. Energies and species were determined by comparison of traces by optical microscope with traces of known origin. Traces on the backsides of the detectors were found to be at background level. Background was determined by runing the experiment with Al films not loaded with H or D. Four succesive repititions of the experiment at the 200 keV level were run to confirm the reproducibiliy of the experiment. There was a roughly 100 count above background in each detector, or 1340 total estimated per run for the H-H reaction. A slightly higher rate was indicated for the D-D reaction. This is a rate of 5x10-15 events per electron, or 2x10^14 electrons per event. However, the fusion events per hydrogen pair in the target is 2.8x10^12 events/H-H pair. The events per collision based on the stimulation energy was calculated to be 10-12 to 10-26 times less than the observed events. The 1996 results (Kamada, Kinoshita, Takahashi) involved similar proceedures but bombardment was at 175 keV using a TEM which simulataneously was used for taking images of the target. Transformed (melted) regions with linear dimensions of about 100 nm were observed that indicated heat evolvement of 160 MeV for each transformed region. The (energy evolved) / (beam energy) for each region is about 10^5. Implantation of H was done at 25 keV to a depth of about 100 nm. at a fluence of 5x10^17 H+/cm^2. Bubbles of "molecular coagulations" of H were formed at pressures of 7 GPa. At a depth of 60 nm H density was measured by ERD to be 2x10^22 atoms/cm^3. Immediately after implantation molecular density was 1x10^22 mol./cm^3, Molar volume was 60 cm^3/mol and pressure 54.5 MPa. The targets were 5 mm dia 0.1mm thick polished using a TENUPOLE chemical polishing machine to a thickness of 1 uM over an area of 1 mm and a small hole of 0.1 mm dia. in the central part. A HITACHI H-700 TEM was used. The beam was 50 nA on an area of about 1 um dia. giving flux of 4x10^19 e/(cm^2*s). The area is first examined with the beam not fully focused and the spots are not there. The beam is focused and the spots appear (photographed) within about 10 s. for D2, not at all with H2. The experiment was repeated over 30 times!. To reliably reproduce the result two conditions must be met: (1) The microstructure must be optimum, meaning there must be a minimum of tunnel structures connecting the implanted bubbles. (This is insured by limiting the fluence of the implanting beam to 5x10^17 H+/cm^2.) (2) The intensity of the electron beam must be roughly 1x10^19 electrons/(cm^2*s). Regards, Horace Heffner
