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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 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. 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.”
V. Sokolov, X. Wei, A. K. Sen
Fusion Science and Technology | Volume 59 | Number 1 | January 2011 | Pages 154-157
doi.org/10.13182/FST11-A11596
Articles are hosted by Taylor and Francis Online.
The anomalous radial transport generated by drift wave turbulence is a fundamental open physics question in magnetic confinement systems, both in modern tokamaks and current and next generation mirror machines. The role of self-generated zonal flows (ZF) in transport regulation via its shear is a potent concept and a physics issue. ZF are believed to be spontaneously excited by drift wave turbulence via Reynolds stress from small-scale fluctuations to large-scale flow.A basic physics experimental study of zonal flows associated with ITG (ion temperature gradient) drift modes has been performed in the Columbia Linear Machine (CLM). The difficult problem of detection of ZF has been solved via a novel diagnostic using the paradigm of FM (frequency modulation) in radio transmission. We find a power spectrum peak at ITG (`carrier') frequency of ~120 kHz and FM sidebands at frequency of ~2 kHz. We have definitively identified ZF with azimuthal and axial symmetry (k = 0, k// [approximately equal] 0) and radially inhomogeneous (kr [not equal] 0) flow structures in cylindrical plasmas in uniform axisymmetric magnetic field. However, quantitatively, the stabilizing effect of ZF shear appears to be small and no significant isotopic effects are observed. The unique complementary roles of ion acoustic damping and ZF shearing in the saturation of ITG have been experimentally demonstrated using stabilizing and destabilizing feedback techniques. Theoretically ZF is supposed to be saturated via ii. As this is very small both in tokamaks and CLM, we investigate the scaling ZF with in in which can be significant in CLM.