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Nominations open for CNTA awards
Citizens for Nuclear Technology Awareness is accepting nominations for its Fred C. Davison Distinguished Scientist Award and its Nuclear Service Award. Nominations for both awards must be submitted by August 1.
The awards will be presented this fall as part of the CNTA’s annual Edward Teller Lecture event.
C. B. Yeamans, D. L. Bleuel
Fusion Science and Technology | Volume 72 | Number 2 | August 2017 | Pages 120-128
Technical Paper | doi.org/10.1080/15361055.2017.1320499
Articles are hosted by Taylor and Francis Online.
In need of a spatially resolved neutronic measurement to better understand the implosion physics of inertial-confined fusion, the National Ignition Facility (NIF) developed a distributed Flange-mounted Neutron Activation Diagnostic system (FNAD). FNAD measures primary deuterium-tritium (D-T) fusion neutron fluence at 20 points surrounding the target chamber using the 90Zr(n,2n)89Zr reaction, utilizing the 12.1-MeV reaction threshold to minimize signal from spurious neutron sources. Through careful design of the measurement systematics, the relative ratios of fluence at those 20 points are measured to within 2%. This precision is sufficient to allow interpretation of the resulting neutron sky as a map of scattering mass areal density (ρR) of the cold compressed D-T fuel surrounding the nuclear burn. Controlling the shape of this fuel during assembly is essential to achieving optimal implosion performance. This paper details the system design and locational deployment, measurement techniques, and calibration procedure. It also outlines data analysis and reduction, and data presentation methods used during the National Ignition Campaign and High-Foot Campaign.
