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NRC nominee Nieh commits to independent safety mission
During a Senate Environment and Public Works Committee hearing today, Ho Nieh, President Donald Trump’s nominee to serve as a commissioner at the Nuclear Regulatory Commission, was urged to maintain the agency’s independence regardless of political pressure from the Trump administration.
G. Paquignon, D. Brisset, J. Manzagol
Fusion Science and Technology | Volume 59 | Number 1 | January 2011 | Pages 155-158
Technical Paper | Nineteenth Target Fabrication Meeting | doi.org/10.13182/FST11-A11518
Articles are hosted by Taylor and Francis Online.
The Laser Mégajoule cryotarget positioner, PCC, will be used to set cryogenic targets in appropriate conditions for the laser shot in order to reach ignition. These conditions can be summarized as a few parameters of the deuterium-tritium (DT) solid layer: sphericity, roughness, and density of DT gas. The DT mixture is confined and held in a target assembly that is handled and cooled by the PCC. Thus, the parameters of the DT solid layer are controlled by the PCC. In particular, roughness depends on the control of the target base temperature (±1 mK), on the temperature slope while crossing the DT triple point (0.5 mK/min), and on the thermodynamic way followed to reach gas density conditions expected at the laser shot [slow cooling (0.5 mK/min), quenching (several kelvins per second), or rapid cooling (several kelvins per minute)]. Moreover, the required gas density needs high cryogenic power performances of the PCC to be fulfilled. As the target is gripped at cryogenic temperature by the PCC, thermal contact resistance added to power load problems must be faced.We have investigated all these cryogenic challenges on DEMOCRYTE, the prototype of the cryogenic holder setup. Experimental results obtained between 2006 and 2009 are described in this paper.