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Marco Island, FL|JW Marriott Marco Island
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Fusion Science and Technology
Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
G. W. Shuy, D. Dobrott
Fusion Science and Technology | Volume 4 | Number 2 | September 1983 | Pages 252-257
Alternate Fuels | doi.org/10.13182/FST83-A22877
Articles are hosted by Taylor and Francis Online.
A conceptual tandem-mirror reactor (TMR) configuration consists of a solenoidal central-cell with its ends plugged by a combination of electrostatic and magnetic fields. The magnetic fields in the end plug also provide MHD stability. The electrostatic plugs for ions and electrons are created by combining hot electron plasmas and neutral beams for fueling and pumping. A large negative potential may be formed in the end plug to contain central cell electrons, but the central cell floating potential ϕf is driven negative as charge neutrality is maintained. Cat-d TMR plasma performance is assessed with respect to standard (positive), neutral and negative central cell potential operating modes. It is determined that the plasma. Q for a 2000 MW fusion power reactor is peaked for central cell potential ϕf near zero. This is because on one hand, the ion-loss cone is bigger for positive ϕf and the ion plug electrons must overcome larger ϕf + ϕc and hence more ECH is required to build the ion plug, and, on the other hand, the electron loss-cone is bigger for negative ϕf and synchrotron losses are severe. A zero-dimensional plasma physics model for the density and power balance of a Cat-d TMR has been developed from an existing code that models a d-t TMR operating with a positive central cell potential. The new Cat-d code models all potential operating modes and has been benchmarked.