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Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
2020 ANS Virtual Winter Meeting
November 15–19, 2020
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Fusion Science and Technology
UWC 2020: A call for transformational change
Bowing to current COVID-19 realities but buoyed by the success of June’s virtual Annual Meeting, ANS event planners returned to the virtual realm for this year’s Utility Working Conference. Originally scheduled for August 9–12 at Marco Island, Fla., the condensed event was held Wednesday, August 11, wherever registrants’ computer devices happened to be located.
In addition to 26 educational sessions and workshops, UWC 2020 featured an opening plenary session titled “Achieving Transformational Change: A leadership discussion,” moderated by Bob Coward, MPR Associates principal officer and ANS past president (2017–2018). Plenary panelists included representatives from three utilities—Arizona Public Service (APS), Exelon, and Xcel Energy—plus the Institute of Nuclear Power Operations (INPO) and the Nuclear Regulatory Commission.
E. M. Giraldez, M. L. Hoppe Jr., D. E. Hoover, A. Q. L. Nguyen, N. G. Rice, A. M. Garcia, H. Huang, M. P. Mauldin, M. P. Farrell, A. Nikroo, V. Smalyuk
Fusion Science and Technology | Volume 70 | Number 2 | August-September 2016 | Pages 258-264
Technical Paper | dx.doi.org/10.13182/FST15-234
Articles are hosted by Taylor and Francis Online.
Hydrodynamic instability growth and its effects on capsule implosion performance are being studied at the National Ignition Facility (NIF). Experimental results have shown that low-mode instabilities are the primary culprit for yield degradation. Ignition-type capsules with machined two-dimensional (2-D) sinusoidal defects were used to measure low-mode hydrodynamic instability growth in the acceleration phase of the capsule implosion. The capsules were imploded using ignition-relevant laser pulses and the ablation-front modulation growth was measured using X-ray radiography. The experimentally measured growth was in good agreement with simulations.
Fabrication of the preimposed 2-D sinusoidal defects of different wavelengths and amplitudes on the surfaces of ignition-type capsules was accomplished by General Atomics leading up to and during the Hydro-Growth Radiography campaign for the hydrodynamic instability growth experiments conducted at NIF between 2013 and 2014. The 2-D sinusoidal defects were imposed on ignition-type capsules by machining the surface of the capsule. The fabrication trials showed that there are six parameters that can affect the ripple form, wall thickness, and the extent of the pattern about the equator of the capsule: (1) knowing accurately the outer diameter of the capsule, (2) the roundness of the capsule (modal content), (3) the cutting tool alignment with respect to the surface of the capsule, (4) the radius and form of the cutting tool, (5) tool touch-off, and (6) the runout of the capsule center with respect to the axis of rotation of the lathe’s spindle. In this paper, we will describe the importance of these parameters on the machining of uniform 2-D sinusoidal defects.