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This Defense Intelligence Reference Document, dated 23 March 2010, was prepared by the Defense Intelligence Agency's Defense Warning Office. It is one of the advanced technology reports produced under the Advanced Aerospace Weapon System Applications Program. The paper is a historical survey of claimed links between superconductors and gravity, covering Podkletnov's gravity shielding claims, the Li and Torr theories, and NASA and Tajmar experiments. It concludes that no replication exists and that research in this area is fraught with experimental difficulty.
From the source: Release of 2026-09-18 Incident: 3/23/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD is a historical survey of efforts to determine whether superconductors might play a role in producing, detecting, or modifying gravity-related effects in a laboratory setting. It reviews the main theoretical and experimental lines of work in that area and attempts to connect superconducting materials with gravitational-wave or propulsion-related concepts. Because the topic is highly contested within the scientific literature, the report spends substantial attention on experiments of disputed value and on controversial theories, especially claims that rotating or energized superconductors might generate anomalous gravitational effects. Overall, the document treats the subject as an exploratory research area with potentially major implications if any real effect were verified, while also making clear that the evidentiary base remained weak, that prominent claims had not been convincingly replicated, and that both the underlying theory and the experimental record remained deeply disputed.
UNCLASSIFIED/ /Pelt err1e1J1tt l!ISI!!! 8HL'I 15 Podkletnov, E. and Nieminen, R., "A Possibility of Gravitational Force Shielding by Bulk YBa2Cu3O7-x Superconductor," Physica C, Vol. 203, 1992, pp. 441-444 16 Li, N. and Torr, D. G., "Effects of a Gravitomagnetic Field on Pure Superconductors," Phys . Rev. D, Vol. 43, No. 2, 1991, pp. 457-459 17 Li, N. and Torr, D. G., "The Gravitoelectrodynamics of Superconductors: A Theoretical Basis for a Principle of Electrically Induced Gravitation," Bull. Am. Phys. Soc., Vol. 37, No. 2, 1992, Session G8 paper 10 18 Li, N. and Torr, D. G., "Gravitoelectric- Electric Coupling via Superconductivity," Found. Phys. Lett., Vol. 6, No. 4, 1993, pp. 371-383 19 Dewitt, B.S., "Superconductors and Gravitational Drag, " Physical Review Letters, Vol. 16, 1966, p. 1902 20 Ross, D.K., "The London Equation for Superconductors in a Gravitational Field," Journal of Physics A, Vol. 16, 1983, pp . 1331 - 1335 21 Prof. Pentti Kettunen, Tampere, Finland, private communication, 2007 22 Risto Nieminen, Tampere, Fin land, private communication, 2007 23 de Podesta, M., Bull, M., "Alternative Explanation of "Gravitational Screening" Experiments," Physica C, Vol. 253, 1995, pp 199-200 24 Prof. R. Gonnelli, Turin, Italy, private communicatio n, 1999 25 Woods, R. C., Cooke, S. G., Helme, J., and Caldwell, C. H., "Gravity Modification by High-Temperature Superconductors," AIAA-2001-3363, 37th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT, July 2001. 26 Kowitt, M., "Gravitomagnetism and Magnetic Permeability in Superconductors," Phys . Rev. B, Vol. 49, 1994, pp. 704-708 27 Harris, E. G., "Comments on 'Gravitoelectric-electric Coupling via Superconductivity'," Found. Phys. Lett ., Vol. 12, 1999, pg. 201 28 Podkletnov, E., "Weak Gravitationa l Shielding Properties of Composite Bulk YBCO Superconductor below 70K under EM Field" LANL cond-mat/9701074 v .3, 16 Sept 1997 29 Li, N., Noever, D., Robertson, T., Koczor, R., and Brantley, W., "Static Test for a Gravitational Force Coupled to Type II YBCO Superconductors," Physica C, Vol. 281, 1997, pp. 260-267 30 Noever, D., and Koczor, R., "Radio-freq uency Illuminated Superconductive Disks: Reverse Josephson Effects and Implications for Precise Measuring of Proposed Gravity Effects," NASA JPL 9th Advanced Space Propulsion Research Workshop & Conference, Pasadena, CA, 1998 31 Noever, D., Koczor, R., Roberson, R., "Superconductor-Mediated Modification of Gravity? AC Motor Experiments with Bulk YBCO Disks in Rotating Magnetic Fields," AIAA-98-3139, 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cleveland, OH, July 1998 32 Reiss, H. D., "A Possible Interaction between Gravity and High Temperature Superconductivity - by a Materials Property?," 15th European Conference on Thermophysical Properties, Wuerzburg, Germany, Sept 1999 33 Reiss, H. D., "Weight Anomalies Observed during Cool-Down of High Temperature Superconductors," Phys . Essays, Vol. 16, 2003, pp. 236-253 34 Podkletnov, E. and Modanese, G., "Impulse Gravity Generator Based on Charged YBa2Cu3O7-y Superconductor with Composite Crystal Structure," arXiv : physics/0108005, Aug . 2001 35 Hathaway, G., Cleveland, B., and Bao, Y., "Gravity Modification Experiment using a Rotating Superconducting Disk and Rad io Frequency Fields," Physica C, Vol. 385, 2003, pp. 488-500 36 Tajmar, M., and De Matos, C., "Coup ling of Electromagnetism and Gravitation in the Weak Field Approximation," Jnl. of Theoretics, Vol. 3, No. 1, 2001 37 De Matos, C., and Tajmar, M., " Gravitomagnetic Barnett Effect," Indian J. Phys., Vol . 75B, No. 5, 2001, pp. 459- 461 38 Chiao, R., "Superconductors as Quantum Transducers and Antennas for Gravitational and Electromagnetic Radiation," arXiv: gr-qc/0204012, Apr. 2002 39 Harris, E., "Superconductors as Gravitational Wave Detectors," 69th Annual Meeting Southeastern Section, Am. Phys. Soc., No. NC.001, 2002 40 London, F., in : Superfluids, Vol 1, John Wiley & Sons, New York, 1950, pg . 78 4 1 Tate, J., Cabrera, B., Felch, 5., and Anderson, J., "Precise Determination of the Cooper-pair Mass, " Phys. Rev . Lett., Vol. 62, No. 8, 1989 pp. 845-848 42 Tajmar, M., and De Matos, C., "Gravitomagnetic Field of a Rotating Superconductor and of a Rotating Superfluid," Physica C, Vol. 385, 2003, pp. 551-554. 43 Reiss, H.D., Hathaway, G.D., "Minimum Experimental Standards in the Laboratory Search for Gravity Effects," Space Technologies and Applications International Forum 2005, El Genk, M.5. (ed .) American Institute of Physics Conference Proceedings, Melville, NY, 2005 44 Taj mar, M., Plesescu, F., Marhold, K., De Matos, C., "Experimental Detection of the Gravitomagnetic London Moment," arXiv: gr-qc/0603033, Mar. 2006 45 E. W. Davis, Institute for Advanced Studies, Austin, TX, private communication, 2007 46 Tajmar, M., Plesescu, F., Seifert, B., Schnitzer, R., and Vasiljevich, I., "Search for Frame-Dragging in the Vicinity of Spinning Superconductors" arXiv : abs/0707 .3806v7 47 M. Tajmar, Austrian Research Centres, Seibersdorf, Austria, private communication, 2008 48 http://www .newscientist.com/article/dn13938?feedid=online-news_ rss20, accesses Jan 25, 2009 UNCLASSIFIED/ /FOR 8FFI@IAL YSI!! er•tv 12
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Official release, from the pursue 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.