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Senior research engineer and division head Joseph Minervini, will serve as assistant director of the MIT Plasma Science and Fusion Center (PSFC), effective Nov. 1. He joins PSFC leadership, including Professor Dennis Whyte (director), Martin Greenwald (deputy director), and Richard Temkin (associate director). “Dr. Minervini brings internationally acknowledged expertise in fusion and magnet technology to the PSFC directorship,” Whyte says on the appointment. “I am very enthusiastic about working with Joe in developing a strategic plan for the PSFC that advances and incorporates new technologies critically needed by fusion, and particularly in the field of advanced magnets using high-temperature superconductors.” Minervini received his PhD in mechanical engineering from MIT in 1981. He has conducted research at PSFC since 1984, has led the Fusion Technology and Engineering division of the PSFC since 1995, and became a senior research engineer in 2000. His research has focused on advancing superconductor magnet technology for fusion, with over 125 peer-reviewed publications on the subject. In the 80s and 90s, Minervini led the development of magnet technology currently being used in the ITER fusion experiment. He holds a joint appointment as senior research engineer in the Deparment of Nuclear Science and Engineering at MIT. A leader in his field, Minervini’s expertise in magnets is sought by a diverse set of research communities and projects including the Thomas Jefferson National Accelerator Facility, the U.S. ITER Project Office, and the U.S. Large Hadron Collider Accelerator Research Program. Recently he served on the National Research Council Committee to “assess the current status and future direction of high magnetic field science in the United States.” Since 2012 he has serve on the editorial board of Superconductor Science and Technology. In 2013 Minervini was awarded the IEEE Council on Superconductivity Award for “continuing and sustained contributions in the field of applied superconductivity.” Minervini succeeds Peter Catto, who had served as assistant director since 2000. Catto will continue to the lead the Plasma Theory Group at the PSFC. Says Dennis Whyte: “I want to acknowledge Peter’s outstanding contributions to the PSFC during his 15 years as assistant director and his continued scientific and programmatic leadership in plasma theory.”

Simon F.,ITER Organization | Ilyin Y.,ITER Organization | Lim B.S.,ITER Organization | Cau F.,Fusion Technology | And 2 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2010

Since it is practically impossible to remove the Poloidal Field (PF) coils from the assembled ITER (International Thermonuclear Experimental Reactor) tokamak without major interruption in operation, the design of these coils shall provide their high reliability under high voltage operation. The design of the coil insulation relies on a separation of functions: mechanical function of the load transmission, performed by glass-fiber impregnated with epoxy resin on one side, and the independent electrical barrier made of polyimide tapes on the other side. Numerical simulation has shown that the maximum electrical field in the coil is lower than 4 kV/mm, which is taken as the design criterion for the PF insulator system. In case of a single insulation failure in a coil, its functionality can be recovered by installing a so-called jumper to by-pass the faulty double pancake. The design of the jumpers and their installation procedure are described. © 2006 IEEE.

Nabara Y.,Japan Atomic Energy Agency | Hemmi T.,Japan Atomic Energy Agency | Kajitani H.,Japan Atomic Energy Agency | Ozeki H.,Japan Atomic Energy Agency | And 14 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

The performance of two Nb3Sn conductors for the ITER central solenoids was tested. The current sharing temperatures (Tcs) were measured over 17 050 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. Tcs declined almost linearly over the 10 000 rated electromagnetic cycles. Tcs was nearly constant for 70% of the rated electromagnetic cycles, which implies the existence of a fatigue limit in the conductors. For 85% of the rated cycles, a very sharp Tcs degradation of approximately 0.2 K occurred. Some type of large deformation of strands, such as buckling, may have caused this sharp degradation. The effective strain degraded linearly with the electromagnetic force on the cable. The gradient after 10 000 cycles was 1.5 times greater than that before cycling. After 10 000 cycles, the ac losses of both conductors considerably decreased to less than half of those before cycling. These ac losses before cycling were less than a fourth of those of toroidal field conductors. After the test campaign, destructive inspection of the conductor clarified that on average, the distribution of residual strain along the cable was almost uniform at -32 ppm. It was also clarified that some strands were visibly deformed under a high magnetic field, whereas strands under a low magnetic field did not appear to be deformed. The deformations of the central solenoid cable were larger and wavier in subcables than those observed in the toroidal field cable. This plastic deformation of the strands could be one of the major reasons for the Tcs degradation during cyclic operation. © 2002-2011 IEEE.

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