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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
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.”
R.W. Springer, B.J. Cameron, G.A. Reeves
Fusion Science and Technology | Volume 31 | Number 4 | July 1997 | Pages 449-455
Technical Paper | Eleventh Target Fabrication Specialists' Meeting | doi.org/10.13182/FST97-A30800
Articles are hosted by Taylor and Francis Online.
A new ion beam technology has been developed which allows the specific control of a number of material parameters not previously or easily controlled during thin film fabrication. The new device is a modified Kaufman ion source. The principal differences are in the design of the grids, and the fact that the gun has an open bottom structure. An additional grid has been added on the bottom to contain the plasma and force the gun to be “unidirectional.” The gun operates by forming an electron driven plasma in the center, while allowing evaporated material to pass through this plasma. When the material moves through the plasma, it may also be ionized by the Penning process, or by electron impact. The voltage of the plasma, referenced to the substrate, may be adjusted from ∼100 volts to ∼1000 volts. As the ionized plasma and deposit leave the chamber, they pass by a hot filament which provides electrons to create a charge neutral beam. Thus both insulating and conducting materials may be deposited on both insulating and conducting substrates. Another important property that can be controlled using the FTIG is the orientation of the crystal structure. Films of MgO and YSZ have been deposited in an oriented state. These cubic structures can be “forced” to a preferred 111, 220, 200, or random orientation, depending on the rate of deposit and gun voltage. A practical example of a solved problem using new modeling techniques and the Flow Through Ion Gun (FTIG) is described. The problem is to apply a platinum coating to aluminum which forms an oxide and makes film adhesion difficult with noble metals. The FTIG was used to pre-clean the inside surface, and subsequently deposit gold. Due to the aspect ratio of the cylinder, two cleaning and deposit cycles were required. Platinum distributions from an electron beam gun were used to compute a thickness uniformity on the inside of the cylinder. The uniformity was computed and measured to be ∼10% from end to end. The film microstructure was compared with thin film ballistic computations using SIMBAD, and the agreement found to be excellent.