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This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 6 April 2010, is one in a series of FY 2009 advanced technology reports produced under the Advanced Aerospace Weapon System Applications (AAWSA) program. It reviews the physics of zero-point field energy in the quantum vacuum and proposed schemes for extracting it, including the Casimir effect, Forward's vacuum-fluctuation battery, and resonant dielectric spheres. It notes that no practicable extraction technique has been demonstrated in the laboratory.
“Lockheed”2 pages
10·21 UNCLASSIFIED//FIHl 8FFHil.t.k Wfili IH.k\f Material: W N coil: 2000 a coil: 1 cm b coil: 0.01 cm T: 3 Kelvin Figure 4. Theoretical Voltage Spectral Density of a Tungsten Coil 10' To successfully measure the ZPF-induced voltage fluctuations, the requirements of low temperature, large coil, and high frequency must be met. The low-temperature requirement is met by performing the experiment in a cooled dewar. Existing high- quality cryogenic dewars (pumped down to 3 K) and sensitive laboratory instruments are suitable for the measurements. The cold spot in one particular dewar under consideration is cylindrical, 2.5 cm in both diameter and height. The largest coil that can be installed will thus have a coil radius of approximately a= 1 cm. To keep the linear dimension of the coil small will require a small wire thicknesses, perhaps b = 0.01 cm (gauge 38 AWG). By winding the coil in a number of layers (10 or 12 layers), a large number of turns can be accommodated, perhaps N = 2,000 turns. To minimize ohmic resistance, wire made of tungsten (W) is preferred; however, copper (Cu) is a suitable alternative. Voltage fluctuations in the 100 MHz range are easily detected using commercially available laboratory equipment; hence this experiment could be performed using tungsten without resorting to the more sophisticated Josephson junction techniques required by Koch et al. for their higher frequency measurements. For a copper wire coil, the magnitude of the enhancement effect is reduced somewhat compared to the tungsten results shown in Figure 4. But for frequencies approaching the GHz regime, the radiation resistance enhancement effect in copper wire is still predicted to be over 9 UNCLASSIFIED/ ,'P8"1 8PPU!lit.l! l!l91!! 8Hl:Y
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 57 pages are in the text index: search them above, or from the library's search.