DOW-UAP-D131: The Role of Superconductors in Gravity Research - From Podkletnov's Spinning Disk to the "Gravitomagnetic London Moment"

Source file: DOW-UAP-D131_AAWSAP-DIRD-The-Role-of-Superconductors-in-Gravity-Research-March-23-2010.pdf Originating agency: Defense Intelligence Agency (DIA), Defense Warning Office, Directorate for Analysis; prepared by the Acquisition Support Division (DWO-3) under the AAWSA Program Document type: Defense Intelligence Reference Document (DIRD), "Acquisition Threat Support" series, control number DIA-08-1003-013 Date: 23 March 2010 (the cover gives an information cutoff date, ICOD, of 1 December 2010, later than the document date itself) Classification: UNCLASSIFIED//FOR OFFICIAL USE ONLY, with the FOUO caveat struck through on every page; released in 2026 Page count: 16 VIRIN: 260918-D-D0360-1120 PURSUE Release: 6

Summary

This is a short document (12 numbered pages and 48 references, no figures), but it is unusual in the AAWSAP DIRD series: not a review of other people's literature so much as testimony from someone inside the story. The author, whose name is redacted as "AAP Person 75," writes repeatedly in the first person. The author was one of only two people who contacted Podkletnov about his paper in the mid-1990s; the author's laboratory in Toronto tried to replicate the "gravity shielding" experiment; the author hosted Podkletnov twice; and the same laboratory supplied superconducting disks to another researcher. This article refers to the author only by the pseudonym given in the release.

The paper opens with a short introduction and two background sections, on gravitational waves and on gravitoelectromagnetism, followed by a "Historical Timeline" that makes up most of the document. The central question is whether superconductors, especially YBCO ceramics that superconduct at liquid-nitrogen temperature, can produce, detect or modify gravity-like forces in the laboratory.

The author's answer is cautious and sober. Every prominent claim, from Podkletnov's disk to Tajmar's measurements, has either failed to replicate or been withdrawn, and the author's own replication produced a null result. The paper does not mention UFOs or unidentified phenomena; its link to aerospace runs through the idea of lift and propulsion without conventional thrust.

Research Article

Gravity, waves and gravitoelectromagnetism

The section on gravitational waves separates three things: gravitational waves, the gravitational "force," and anomalous forces. Low-frequency waves (below a few hundred Hz) are the territory of detectors such as LIGO, LISA, VIRGO, Japan's DECIGO and China's CEGO; a smaller group of researchers believes that high-frequency gravitational waves (HFGW, above several tens of kHz) will be produced in the laboratory "in the near future," with uses in communications, telescopy and possibly propulsion, perhaps mediated by superconductors. The author notes that "Current research on the link between HFGW and the manipulation of gravity for propulsion is at present only theoretical" (page 5).

The section on gravitoelectromagnetism (GEM) sets out the theory. In the weak-field, low-velocity limit, general relativity can be written in equations resembling Maxwell's: a "gravitoelectric" field (ordinary Newtonian gravity) and a "gravitomagnetic" field produced by moving mass, also known as frame dragging or the Lense-Thirring effect. The analogy, which Forward was among the first to explore in the early 1960s, even includes a Faraday-like law of induction. The author also mentions alternative explanations of gravity: gravity as a Casimir-like force arising from zero-point fluctuations (Puthoff, following Sakharov), altering nuclear entropy (Alzofon) and the "Kopernicky Conjecture." The paper stresses that none of them relied on superconductors, and that observations so far show interactions between gravity and electromagnetic fields to be many orders of magnitude smaller than would be needed to see such forces (pages 5-6).

According to the paper, the interest in modifying gravity for propulsion falls into two categories: neutralizing the attraction of a nearby body, usually Earth, and providing thrust to a spacecraft by manipulating the phenomenon that underlies gravity (page 6). Of the twelve technical areas in the program's Statement of Objectives (DOW-UAP-D110), the paper serves mainly lift and propulsion, and to a lesser extent materials.

The theory: Li and Torr

The timeline begins with theory. Building on earlier work by DeWitt (1966) and Ross (1983), who added gravitomagnetic fields to the London equations of superconductivity, Ning Li and Douglas Torr published a paper in 1991 predicting a small internal gravitomagnetic field in a superconductor. In 1992 they presented work to the American Physical Society whose title included "A Theoretical Basis for a Principle of Electrically Induced Gravitation" (page 8). The critiques followed: Kowitt in 1994, and Harris in 1999 in a "more effective critique" showing that the induced gravitoelectric field outside the superconductor was "some 20 orders of magnitude smaller!" than their estimate. According to the author, "No evident rebuttal has been forthcoming from Li or Torr" (page 10).

1992: Podkletnov's disk

"Then came the bombshell," the author writes (page 8). In 1992 Evgueny Podkletnov, a Russian materials scientist at the Institute of Materials Science of the Tampere University of Technology in Finland, and his coauthor Nieminen published a paper in Physica C on an apparent "gravity shielding" experiment: a YBCO disk 14.5 cm across and 6 mm thick, levitated by Meissner repulsion over an electromagnet in liquid-helium vapor and spun at thousands of rpm. A test mass hung above the disk supposedly lost up to about 0.3 percent of its weight (page 9).

The author adds details not found in the scientific literature, drawn from private communications in 2007. The institute's former director, Pentti Kettunen, said the experiment was conducted "after hours" and not at the institute, and that he himself never witnessed it; the coauthor was a technician who was not involved in the experiments and still does not know why he was asked to coauthor the paper. The story of how the effect was discovered, smoke from a coworker's pipe rising exactly in the "shadow" of the disk, was confirmed by Kettunen, but the author notes that normal rotational speeds for magnetron sputtering are in the tens of rpm, not thousands (pages 8 and 11).

The experimental critique is specific. According to the only published sketch, a thin plastic film was all that separated the helium vapor from the laboratory air, so it should have frosted over and become opaque, or burst from the boiling helium; thermal currents and buoyancy changes above such a cryostat would have made weighing a test mass only 1.5 cm above the disk "virtually impossible" (page 9). The bottom line: "Most damning to Podkletnov's case was the complete lack of any supporting evidence that the experiment had ever actually taken place" (page 10).

The replication wave: NASA, South Carolina and Toronto

The paper records the wave that followed. In 1995 Li approached NASA for funding; preliminary experiments there, with a small disk at liquid-nitrogen temperature, showed no shielding, and a reported "very weak gravity increase" in disks irradiated at radio frequencies of 1 to 15 MHz was later shown to be an instrumentation artifact. NASA paid for the commercial fabrication of a 27-cm bi-layer disk to Podkletnov's specification, but the budget ran out, and around 2002 the effort was abandoned, in part because there were no spare disks in case the only one broke (pages 11-12). In 1997 the University of South Carolina announced that it was seeking investors for a "Gravity Generator" that would "replace the wheels of a car...lift and propel aircraft"; a later announcement called the first one "premature" (page 11).

Meanwhile the author's laboratory in Toronto built its own version of the experiment, with a better cryogenic design and large YBCO disks made in house. Podkletnov visited twice, and under persistent questioning it emerged that he had not been involved in the electrical design of his experiment, only in the ceramic side. The replication was completed in late 2001 and published in 2003, with a null result; in the author's words, "It represented -- and still represents -- the closest published replication of the original Podkletnov experiment" (page 13). The paper also describes Podkletnov's "gravity beam" experiment: an array of YBCO crystals connected to a van de Graaff machine of about 200 kilovolts, a blue "discharge," and a pencil that fell over in an adjoining room behind a thick concrete wall. The author notes that no one has published a replication and that more and more scientists conclude "the experiment was never actually performed" (pages 11, 12 and 15).

Tajmar and the "gravitomagnetic London moment"

The last chapter of the timeline concerns Martin Tajmar and C. De Matos, who from 2001 carried on the Li and Torr line. Their starting point was the "Cooper Pair Mass Anomaly": measurements showing a Cooper pair to be slightly heavier than predicted. Tajmar argued that the anomaly required a "relatively huge" internal gravitomagnetic field in spinning superconducting rings. In 2006 he and his colleagues reported accelerometer signals matching the prediction to within a factor of 1.5; Eric Davis of the Institute for Advanced Studies in Austin challenged the theoretical basis. By 2007 Tajmar acknowledged that new data "rule out our previous theoretical model," but an unexplained residual signal remained, with a coupling constant of 10^-8, stronger for clockwise rotation and not decaying as a dipole field would. According to the author, the effect gradually approached the noise floor, and the explanations offered in 2008 became "more difficult to understand and believe" (page 14).

The author as witness, and what the paper does not say

Several of the paper's most important details rest on private communications (with Kettunen, with the coauthor of the 1992 paper, with Tajmar and with Davis) rather than on published sources. The author is also not a neutral observer: their own replication is one of the main sources, and they note that they compiled an extensive list of experimental pitfalls (Reference 9) and that their laboratory supplied disks to Harald Reiss, who measured a weight increase of about 0.5 percent in samples during cool-down and found no prosaic explanation for it (page 12). There are also signs of hasty editing: the ICOD on the cover is later than the document date; the NASA researcher's name is spelled two ways; and the reference list contains stray items, such as a New Scientist piece titled "Cool colours, man" and an article from a window-film trade magazine.

The paper does not mention UFOs, unidentified aerial phenomena or anomalous craft, and it offers no timelines or threat assessment. As general context: the paper describes the analysis of Gravity Probe B data as "in serious difficulty" (page 15); the satellite's final results, published in 2011 after the paper was written, reported a measurement of frame dragging.

Significance

The document matters in two ways. First, it shows that AAWSAP sought to document even the most contested lines of "antigravity" research, and that what it received was not advocacy but a record of their failure. Second, it is a primary source for anyone studying the history of the field: behind-the-scenes detail on the Podkletnov experiment, NASA's involvement and the University of South Carolina announcement, from someone who personally tried to reproduce the experiment.

The conclusion is balanced rather than dismissive. The author calls the discovery potentially "a breakthrough of the first order" (page 7), and attributes the small number of researchers both to "dogma" and to reputable physicists pointing out that the theoretical constructs rest on questionable foundations. The author's bottom line: "The likelihood of scientific ridicule is extremely high in the search for laboratory-scale gravitational interactions" (page 15). By the document's own account, artificial gravity and gravity shielding remained without a replicated experimental demonstration.

Key People

Locations

Key Concepts

Notable Quotes

"This paper is a historical survey of the role superconductors have played in the recent search for laboratory-scale manipulation of gravity." -- page 4

"Current research on the link between HFGW and the manipulation of gravity for propulsion is at present only theoretical." -- page 5

"However, the rush to be the first to successfully find a repeatable and verifiable link between superconductors and gravity has produced many casualties." -- page 7

"In fact, Harris pointed out that the correct estimation of the induced gravitoelectric field outside a superconductor is some 20 orders of magnitude smaller!" -- page 10

"Most damning to Podkletnov's case was the complete lack of any supporting evidence that the experiment had ever actually taken place." -- page 10

"It represented -- and still represents -- the closest published replication of the original Podkletnov experiment." -- page 13

"No one has published a replication of his 'gravity beam' experiment, and as time passes, more and more scientists are coming to the conclusion that the experiment was never actually performed." -- page 15

"The likelihood of scientific ridicule is extremely high in the search for laboratory-scale gravitational interactions." -- page 15