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This Defense Intelligence Reference Document from the Defense Intelligence Agency is dated 23 March 2010. It was produced under the Advanced Aerospace Weapon System Applications (AAWSA) Program and surveys the history of attempts to use superconductors to manipulate gravity in the laboratory. It reviews theoretical work by Li and Torr, Podkletnov's disputed gravity shielding experiments, NASA replication attempts and Tajmar's results. It concludes that no repeatable effect has been verified and that research in this area remains fraught with experimental difficulty.
UNCLASSIFIED//F'iA. 'iFFllil,t.k l.llilii 'i•lk>f The Role of Superconductors in Gravity Research Introduction This paper is a historical survey of the role superconductors have played in the recent search for laboratory-scale manipulation of gravity. The invention of superconductors and, in particular, the recent development of high- temperature ceramic superconductors have provided the impetus for pursuing a connection between gravity, electromagnetism, and, in particular, magnetism and matter in the solid state. The discovery of yttrium-barium- copper oxide (YBCO) YBa2Cu3Q7 ceramics able to superconduct at liquid nitrogen temperatures allowed many laboratories around the world to fabricate these superconductors in various experimentally useful sizes. True Meissner repulsion was obtained by cooling them using relatively cheap liquid nitrogen rather than liquid helium. For the theoretician, the possibility of considering the superconductor being a macroscopic quantum object as a reality rather than a fantasy suggested several avenues for developing theories connecting gravity and gravity-like forces to engineerable matter. For the experimentalist, extrapolations from these theories suggested there might actually be gravitational disturbances in the laboratory that would be amenable to measurement, assuming all necessary precautions were taken to exclude artifact. iii UNCLASSIFIED/ ,sralil 8FFI&I.«1k Wlili ·••LY
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 16 pages are in the text index: search them above, or from the library's search.