scholarly journals Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA

2018 ◽  
Vol 25 (6) ◽  
pp. 062701 ◽  
Author(s):  
A. Bose ◽  
R. Betti ◽  
D. Mangino ◽  
K. M. Woo ◽  
D. Patel ◽  
...  
Keyword(s):  
Direct Drive ◽  
Fusion Yield

scholarly journals Plasma Power Station with Quasi Spherical Direct Drive Capsule for Fusion Yield and Inverse Diode for Driver-Target Coupling

2012 ◽  
Vol 61 (1T) ◽  
pp. 101-106 ◽  
Author(s):  
J. P. VanDevender ◽  
M. E. Cuneo ◽  
S. A. Slutz ◽  
M. Herrmann ◽  
R. A. Vesey ◽  
...  
Keyword(s):  
Plasma Power ◽  
Direct Drive ◽  
Power Station ◽  
Fusion Yield

scholarly journals Modeling turbulent mixing in inertial confinement fusion implosions

2003 ◽  
Vol 21 (3) ◽  
pp. 355-361 ◽  
Author(s):  
YAIR SREBRO ◽  
DORON KUSHNIR ◽  
YONI ELBAZ ◽  
DOV SHVARTS
Keyword(s):  
Turbulent Mixing ◽  
Inertial Confinement Fusion ◽  
Large Scale ◽  
Initial Perturbation ◽  
Mixing Model ◽  
Experimental Results ◽  
Mode Number ◽  
Inertial Confinement ◽  
Direct Drive ◽  
Fusion Yield

Recent direct drive implosion experiments, performed on the OMEGA laser, have been analyzed by comparing full two-dimensional (2D) and one-dimensional (1D) numerical simulations. The 2D simulations result in a fusion yield higher than experimental results. A simple full-mixing model, leaving only the clean region, overestimates yield degradation. Fully turbulent mixing is expected to develop in most of the mixing region; however regions slightly beyond the radius of the most penetrating spike are expected to remain clean and to contribute to fusion yield. One can correct the mixing model by redefining the clean region. Accounting for this unmixed region results in improved agreement with experimental results. Differences in central pressure, density, temperature, and fusion rate in implosions dominated by low mode number perturbations imply that mix effects might not be limited to the mix region, and that 2D simulations are necessary to describe the large scale flow affecting the central region. The same analysis has been undertaken for implosions with different convergence ratios, but with similar initial perturbation spectra. These implosions should be compared to implosions dominated by high mode number perturbations, which might be described by models based on 1D simulations.

CAD of a direct drive rotary motor based on giant magnetostrictive alloys

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-785-Pr2-788
Author(s):  
M. E.H. Benbouzid ◽  
G. Reyne ◽  
G. Meunier
Keyword(s):  
Direct Drive ◽  
Rotary Motor

Investigations on the positioning accuracy of the Nano Fabrication Machine (NFM-100)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jaqueline Stauffenberg ◽  
Ingo Ortlepp ◽  
Ulrike Blumröder ◽  
Denis Dontsov ◽  
Christoph Schäffel ◽  
...  
Keyword(s):  
Target Position ◽  
Repeated Measurements ◽  
Scanning Probe ◽  
Measuring System ◽  
Direct Drive ◽  
Positioning Accuracy ◽  
Scanning Probe Lithography ◽  
Nano Fabrication ◽  
Atomic Force ◽  
Acceleration And Deceleration

Abstract This contribution deals with the analysis of the positioning accuracy of a new Nano Fabrication Machine. This machine uses a planar direct drive system and has a positioning range up to 100 mm in diameter. The positioning accuracy was investigated in different movement scenarios, including phases of acceleration and deceleration. Also, the target position error of certain movements at different positions of the machine slider is considered. Currently, the NFM-100 is equipped with a tip-based measuring system. This Atomic Force Microscope (AFM) uses self-actuating and self-sensing microcantilevers, which can be used also for Field-Emission-Scanning-Probe-Lithography (FESPL). This process is capable of fabricating structures in the range of nanometres. In combination with the NFM-100 and its positioning range, nanostructures can be analysed and written in a macroscopic range without any tool change. However, the focus in this article is on the measurement and positioning accuracy of the tip-based measuring system in combination with the NFM-100 and is verified by repeated measurements. Finally, a linescan, realised using both systems, is shown over a long range of motion of 30 mm.

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