scholarly journals Irradiation uniformity at the Laser MegaJoule facility in the context of the shock ignition scheme

2014 ◽  
Vol 2 ◽  
Author(s):  
Mauro Temporal ◽  
Benoit Canaud ◽  
Warren J. Garbett ◽  
Rafael Ramis ◽  
Stefan Weber
Keyword(s):  
Inertial Confinement Fusion ◽  
Three Dimensional ◽  
Inertial Confinement ◽  
Direct Drive ◽  
Azimuthal Component ◽  
Hydrodynamic Simulations ◽  
Available Energy ◽  
Confinement Fusion ◽  
Hydrodynamic Calculations ◽  
Shock Ignition

AbstractThe use of the Laser MegaJoule facility within the shock ignition scheme has been considered. In the first part of the study, one-dimensional hydrodynamic calculations were performed for an inertial confinement fusion capsule in the context of the shock ignition scheme providing the energy gain and an estimation of the increase of the peak power due to the reduction of the photon penetration expected during the high-intensity spike pulse. In the second part, we considered a Laser MegaJoule configuration consisting of 176 laser beams that have been grouped providing two different irradiation schemes. In this configuration the maximum available energy and power are 1.3 MJ and 440 TW. Optimization of the laser–capsule parameters that minimize the irradiation non-uniformity during the first few ns of the foot pulse has been performed. The calculations take into account the specific elliptical laser intensity profile provided at the Laser MegaJoule and the expected beam uncertainties. A significant improvement of the illumination uniformity provided by the polar direct drive technique has been demonstrated. Three-dimensional hydrodynamic calculations have been performed in order to analyse the magnitude of the azimuthal component of the irradiation that is neglected in two-dimensional hydrodynamic simulations.

scholarly journals One-dimensional hydrodynamic simulations of low convergence ratio direct-drive inertial confinement fusion implosions

2020 ◽  
Vol 379 (2189) ◽  
pp. 20200224 ◽  
Author(s):  
R. W. Paddock ◽  
H. Martin ◽  
R. T. Ruskov ◽  
R. H. H. Scott ◽  
W. Garbett ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Fusion Energy ◽  
High Gain ◽  
Inertial Confinement ◽  
Direct Drive ◽  
Hydrodynamic Simulations ◽  
One Dimensional ◽  
Confinement Fusion ◽  
High Level ◽  
Fusion Implosions

Indirect drive inertial confinement fusion experiments with convergence ratios below 17 have been previously shown to be less susceptible to Rayleigh–Taylor hydrodynamic instabilities, making this regime highly interesting for fusion science. Additional limitations imposed on the implosion velocity, in-flight aspect ratio and applied laser power aim to further reduce instability growth, resulting in a new regime where performance can be well represented by one-dimensional (1D) hydrodynamic simulations. A simulation campaign was performed using the 1D radiation-hydrodynamics code HYADES to investigate the performance that could be achieved using direct-drive implosions of liquid layer capsules, over a range of relevant energies. Results include potential gains of 0.19 on LMJ-scale systems and 0.75 on NIF-scale systems, and a reactor-level gain of 54 for an 8.5 MJ implosion. While the use of 1D simulations limits the accuracy of these results, they indicate a sufficiently high level of performance to warrant further investigations and verification of this new low-instability regime. This potentially suggests an attractive new approach to fusion energy. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

scholarly journals Target alignment in the Shen-Guang II Upgrade laser facility

2018 ◽  
Vol 6 ◽  
Author(s):  
Lei Ren ◽  
Ping Shao ◽  
Dongfeng Zhao ◽  
Yang Zhou ◽  
Zhijian Cai ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Short Pulse ◽  
Three Dimensional ◽  
Nanosecond Laser ◽  
Alignment Error ◽  
Inertial Confinement ◽  
Pulse Beam ◽  
Rotation Sensor ◽  
Confinement Fusion ◽  
Laser Facility

The Shen-Guang II Upgrade (SG-II-U) laser facility consists of eight high-power nanosecond laser beams and one short-pulse picosecond petawatt laser. It is designed for the study of inertial confinement fusion (ICF), especially for conducting fast ignition (FI) research in China and other basic science experiments. To perform FI successfully with hohlraum targets containing a golden cone, the long-pulse beam and cylindrical hohlraum as well as the short-pulse beam and cone target alignment must satisfy tight specifications (30 and $20~\unicode[STIX]{x03BC}\text{m}$ rms for each case). To explore new ICF ignition targets with six laser entrance holes (LEHs), a rotation sensor was adapted to meet the requirements of a three-dimensional target and correct beam alignment. In this paper, the strategy for aligning the nanosecond beam based on target alignment sensor (TAS) is introduced and improved to meet requirements of the picosecond lasers and the new six LEHs hohlraum targets in the SG-II-U facility. The expected performance of the alignment system is presented, and the alignment error is also discussed.

Improved performance of direct-drive inertial confinement fusion target designs with adiabat shaping using an intensity picket

2003 ◽  
Vol 10 (5) ◽  
pp. 1906-1918 ◽  
Author(s):  
V. N. Goncharov ◽  
J. P. Knauer ◽  
P. W. McKenty ◽  
P. B. Radha ◽  
T. C. Sangster ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Direct Drive ◽  
Confinement Fusion ◽  
Fusion Target ◽  
Improved Performance ◽  
Inertial Confinement Fusion Target

Studies of Plastic-Ablator Compressibility for Direct-Drive Inertial Confinement Fusion on Omega

2008 ◽  
Vol 100 (18) ◽  
Author(s):  
S. X. Hu ◽  
V. A. Smalyuk ◽  
V. N. Goncharov ◽  
J. P. Knauer ◽  
P. B. Radha ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Direct Drive ◽  
Confinement Fusion

scholarly journals Progress in understanding the role of hot electrons for the shock ignition approach to inertial confinement fusion

2018 ◽  
Vol 59 (3) ◽  
pp. 032012 ◽  
Author(s):  
D. Batani ◽  
L. Antonelli ◽  
F. Barbato ◽  
G. Boutoux ◽  
A. Colaïtis ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Hot Electrons ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Shock Ignition

scholarly journals Laser driven implosion

1990 ◽  
Vol 8 (1-2) ◽  
pp. 3-17 ◽  
Author(s):  
C. Yamanaka
Keyword(s):  
Inertial Confinement Fusion ◽  
Laser Energy ◽  
Laser Fusion ◽  
Plastic Shell ◽  
Inertial Confinement ◽  
Liquid Density ◽  
Direct Drive ◽  
Uniform Compression ◽  
Confinement Fusion ◽  
Key Issues

Inertial confinement fusion (ICF) has made great progress. In fact several significant scientific firsts have been achieved in the last year. These developments have presented the ICF community with an opportunity to embark on a new phase in ICF research. The key issues of laser fusion are to attain a high absorption of laser light in a plasma, to prevent preheating of fuel during the compression, and to achieve highly efficient implosion by uniform compression of fuel due to the homogeneous deposition of laser energy on the pellet surface. Direct drive and indirect drive have been investigated. The progress in both schemes is remarkable. The neutron yield by the stagnation free compression of the LHART target has attained 1013 which corresponds to a pellet gain of 1/500. The plastic shell target has reached a fuel density as large as 600 times the liquid density which is measured by the Si activation method as well as the D knockon method. A cryogenic foam target is now under investigation.

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