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WIPP improves utility shaft safety, begins infrastructure project
Harrison Western Shaft Sinkers (HWSS), the company drilling a new utility shaft at the Department of Energy’s Waste Isolation Pilot Plant in New Mexico, has retained a safety culture expert following a near-miss accident in the shaft late last year. The safety expert will conduct monthly facilitated discussions with crews working on the shaft to reinforce expectations for identifying concerns regarding unsafe circumstances, according to a recent report by the Defense Nuclear Facilities Safety Board (DNFSB).
S. Sakakibara, H. Yamada, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 471-481
Chapter 8. Diagnostics | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10833
Articles are hosted by Taylor and Francis Online.
This paper describes present status of magnetic measurements in the Large Helical Device (LHD). The magnetic measurements have been mainly applied for estimation of global parameters and for magnetohydrodynamic (MHD) study rather than the equilibrium control because of net current-free plasmas. The techniques of diamagnetic flux measurement and MHD mode analysis are introduced. The estimation of the diamagnetic flux strongly depends on the plasma currents inducing an eddy current on continuous helical coils. The obtained diamagnetic energy is almost consistent with kinetic energy within the measurement error. The MHD modes have been identified through comparison of magnetic probe signals with virtual perturbation generated by multifilament currents on Boozer coordinates based on three-dimensional MHD equilibria. The validity of this technique was considered through the pressure gradient control experiments.