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Profile: Edward Von Halle

Edward Von Halle was a participant or observer in the following events:

A team of centrifuge physicists at the US Department of Energy’s Oak Ridge National Laboratory and other similar institutions publish a detailed Technical Intelligence Note concerning the aluminum tubes that Iraq recently attempted to import from China (see July 2001). (Gellman and Pincus 8/10/2003; Jackson 10/27/2003; Barstow, Broad, and Gerth 10/3/2004) The team includes Dr. Jon A. Kreykes, head of Oak Ridge’s national security advanced technology group; Dr. Duane F. Starr, an expert on nuclear proliferation threats; and Dr. Edward Von Halle, a retired Oak Ridge nuclear expert. They are advised by Dr. Houston G. Wood III, a retired Oak Ridge physicist considered to be “among the most eminent living experts” on centrifuges, and Dr. Gernot Zippe, one of the German scientists who developed an early uranium centrifuge in the 1950s (see 1950s). The 8-page report, titled “Iraq’s Gas Centrifuge Program: Is Reconstitution Underway?” provides a detailed explanation of why the team believes the 7075-T6 aluminum tubes sought by Iraq were not intended for use in a gas centrifuge. (US Congress 7/7/2004; Barstow, Broad, and Gerth 10/3/2004)
bullet The tubes sought by Iraq are very different from tubes Iraq used previously in its centrifuge prototypes before the first Gulf War. The intercepted aluminum tubes are significantly longer and narrower. (Gellman and Pincus 8/10/2003; Barstow, Broad, and Gerth 10/3/2004)
bullet Aluminum has not been used in gas centrifuges since the 1950s (see After the 1950s). Furthermore, Iraq is known to have had the blueprints for a more efficient centrifuge, which used maraging steel and carbon fiber, not aluminum (see (Late 1980s)). (Gellman and Pincus 8/10/2003) Aluminum “provides performance roughly half that of” maraging steel and carbon fiber composites. Constructing rotors from 7075-T6 aluminum would require the Iraqis to make twice as many rotors, as well as twice as many other centrifuge components, such as end caps, bearings, and outer casings. (US Congress 7/7/2004) “Aluminum would represent a huge step backwards,” according to Wood. (Barstow, Broad, and Gerth 10/3/2004)
bullet There are no known centrifuge machines “deployed in a production environment” that use tubes with such a small diameter. (Barstow, Broad, and Gerth 10/3/2004) Using tubes of this diameter, would have created “various design and operational problems that veteran engineers of Iraq’s prior program should readily understand.” (US Congress 7/7/2004)
bullet The report says that the “various tolerances specified in contract documents… are looser than the expected precision call-outs for an aluminum rotor tube by factors of two to five.” (US Congress 7/7/2004)
bullet The tubes’ walls, measuring 3.3 millimeters, are three times too thick for “favorable use” in a “Zippe-type” centrifuge, which requires tubes with a thickness of no more than 1.1 millimeter. (Gellman and Pincus 8/10/2003; Barstow, Broad, and Gerth 10/3/2004)
bullet The tubes are anodized, which is “not consistent” with a uranium centrifuge because the anodized coating can react with uranium gas. (US Congress 7/7/2004; Barstow, Broad, and Gerth 10/3/2004) Houston G. Wood later tells the Washington Post in mid-2003 that “it would have been extremely difficult to make these tubes into centrifuges,” adding that such a theory stretched “the imagination to come up with a way.” (Gellman and Pincus 8/10/2003) The scientists conclude that using the tubes in centrifuges “is credible but unlikely, and a rocket production is the much more likely end use for these tubes.” (Barstow, Broad, and Gerth 10/3/2004) They also note that the Iraqis previously declared to the International Atomic Energy Agency (IAEA) that since at least 1989, Iraq’s Nasser State Establishment had used large numbers of high strength aluminum tubes to manufacture 81-mm rockets. “The tubes were declared to be made of 7075-T6 aluminum with an 81 mm outer diameter, 74.4 mm inner diameter, and 900 mm length—the same specifications of the tubes Iraq was trying to acquire in 2001,” a later Senate Intelligence report will say summarizing the nuclear scientists’ report. The scientists also say that IAEA inspectors had seen these tubes stored in various locations at the Nasser site. (US Congress 7/7/2004)


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