scholarly journals The truncated amplified spontaneous emission pulses in KrF excimer laser by using timeshare quenching

2014 ◽  
Vol 32 (2) ◽  
pp. 271-275
Author(s):  
P. Y. Du ◽  
Z. W. Lu ◽  
D. Y. Lin
Keyword(s):  
Excimer Laser ◽  
Spontaneous Emission ◽  
Pulse Width ◽  
Inertial Confinement Fusion ◽  
Amplified Spontaneous Emission ◽  
Inertial Confinement ◽  
Emission Pulse ◽  
Confinement Fusion ◽  
Krf Excimer Laser ◽  
The Stability

AbstractIn order to achieve the truncated amplified spontaneous emission pulse, the method of timeshare quenching was proposed in this paper. When the original pulse of the amplified spontaneous emission is 16.72 ns, the obtained best results show that the pulse width is truncated to 2.48 ns, and the shortening ratio is approximately 6.7. By analyzing the 12 acquisition results of the continuous amplified spontaneous emission truncation, 2.59 ± 0.05 ns amplified spontaneous emission pulse was obtained. The experimental results showed that the stability of the truncated pulse width is well. This method is applicable to truncate the ASE pulse in KrF excimer laser. It is significantly to the research of the inertial confinement fusion.

Instability of a Radially Moving Cylindrical Surface: A Viscous Potential Flow Approach

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Mukesh Kumar Awasthi ◽  
Shivam Agarwal
Keyword(s):  
Stability Criterion ◽  
Potential Flow ◽  
Inertial Confinement Fusion ◽  
Fusion Reactor ◽  
Inertial Confinement ◽  
Order Ordinary Differential Equation ◽  
Viscous Potential Flow ◽  
Viscosity Effect ◽  
Confinement Fusion ◽  
The Stability

Abstract The effect of viscosity on the unstable interface of the cylindrical jet is analyzed through viscous potential flow approach. The jet is moving radially and jet interface is experiencing Rayleigh–Taylor type instability. Previous studies have completely ignored the viscosity effect while considering the instability of a radially moving cylindrical jet. The fluids inside and outside jet are incompressible as well as viscous. The theoretical analysis provides us a second-order ordinary differential equation to establish the instability/stability criterion. The radial velocity and acceleration both have significant impact on the stability of the jet. We found that as viscosity enters to the analysis, perturbations grow rapidly. In addition, the acquired stability criterion is applied to the cylindrical jets in HYLIFE-II which is basically an inertial confinement fusion reactor.

The Application of a Grating Tiling Device with Parallel Mechanism in an Inertial Confinement Fusion (ICF) System

2013 ◽  
Vol 579-580 ◽  
pp. 373-380
Author(s):  
Zhong Xi Shao ◽  
Wei Jiang Zhou ◽  
Hong Ya Fu
Keyword(s):  
Inertial Confinement Fusion ◽  
Parallel Mechanism ◽  
Pulse Compression ◽  
Correction Method ◽  
Inertial Confinement ◽  
Positioning Accuracy ◽  
Feed Drive ◽  
Drive Control ◽  
Confinement Fusion ◽  
The Stability

The size of pulse compression gratings (PCG) is very big in the ICF system, so we obtained a large size grating by mechanically stitching small caliber gratings. And we design the splicing mechanism to be a 5-DOF Parallel Mechanism with macro/micro dual feed drive control to meet the requirements of large travel, high precision, high stability and 5-DOF of the grating tiling. The macro-moving part is designed to be the 5PTS-1PPS parallel mechanism, using the Feed Mechanism of ballscrew with Stepper Motor Drive.The micro-moving part is designed to be 5TSP-1PPS parallel mechanism, using the feed mechanism of Flexure Hinge with Piezoelectric Ceramic Actuator. We derived control algorithm of parallel mechanism by the method of the Kinematics of parallel mechanism. We analyzed the systematic error and put forward the error correction method in order to improve the positioning accuracy. At last, we designed an optical detecting system to evaluate the feasibility of this scheme, the positioning accuracy and the Stability of parallel Splicing structure. The results showed that the mechanism performance can meet the requirements of grating tiling work.

Intelligentized Soft X-Ray Picosecond Framing Camera Control System Design

2013 ◽  
Vol 655-657 ◽  
pp. 749-752
Author(s):  
Hao Yu
Keyword(s):  
Inertial Confinement Fusion ◽  
Mode Switching ◽  
Inertial Confinement ◽  
Intelligent Network ◽  
Camera System ◽  
X Ray ◽  
Confinement Fusion ◽  
Embedded Pc ◽  
The Stability ◽  
Framing Camera

In order to meet the demand of diagnostic equipment on the intelligent network testing for inertial confinement fusion (ICF) research, an intelligent X-ray framing camera system is designed and implemented. Embedded PC/104 bus masters the whole system and realizes human-machine communication and networking. The self-designed multifunction interface card can realize the camera work point setting, mode switching and environment monitoring. The specialized software and hardware make the camera has the ability of self-diagnosis and automatically adjust work point. The system improves the stability, reliability, consistency and precision of the camera. It is significant for furthering analysis the ICF issue.

scholarly journals Rayleigh–Taylor instability analysis of targets with a low-density ablation layer

1999 ◽  
Vol 17 (2) ◽  
pp. 237-244 ◽  
Author(s):  
J. SANZ ◽  
R. BETTI ◽  
V.N. GONCHAROV
Keyword(s):  
Inertial Confinement Fusion ◽  
Taylor Instability ◽  
Inertial Confinement ◽  
Low Density ◽  
Radiation Emission ◽  
Confinement Fusion ◽  
Basic Physics ◽  
Rayleigh Taylor Instability ◽  
Boundary Model ◽  
The Stability

Irregularities on the outer surface of Inertial Confinement Fusion (ICF) capsules accelerated by laser irradiation are amplified by the Rayleigh–Taylor instability (RTI), which occurs at the ablation front (ablative RTI), where density gradient and acceleration have the same direction. The analytic stability theory of subsonic ablation fronts, for Froude number larger than one, shows that the main stabilization mechanisms are blowoff convection (rocket effect equilibrating the gravity force) and ablation (Sanz 1994; Betti et al. 1996). Blowoff convection and ablation are enhanced if the ablator material is mixed with high-Z dopants. The latest enhances radiation emission setting the ablator on a higher adiabat, lowering its density, and increasing the ablation velocity. When such an ablator is used to push a solid deuterium-tritium (D–T) shell, the D–T-ablator interface becomes classically unstable. The aim of this paper is to investigate the stability of such a configuration, represented by a low-density ablator pushing a heavier shell, and study the interplay between the classical and ablative RTIs occurring simultaneously. The stability analysis is carried out using a sharp boundary model (Piriz et al. 1997), which contains all the basic physics of the RTI in ICF.

scholarly journals Magnetic suspension of a pellet for inertial confinement fusion

1993 ◽  
Vol 11 (2) ◽  
pp. 455-459 ◽  
Author(s):  
H. Yoshida ◽  
K. Katakami ◽  
Y. Sakagami ◽  
H. Azechi ◽  
H. Nakarai ◽  
...  
Keyword(s):  
Neutron Yield ◽  
Pulse Width ◽  
Inertial Confinement Fusion ◽  
Ferromagnetic Material ◽  
Magnetic Suspension ◽  
Inertial Confinement ◽  
X Ray ◽  
Phase Lead ◽  
Confinement Fusion ◽  
Driving Signal

In inertial confinement fusion experiments, the symmetrical implosion calls for a new scheme: a nonsupported pellet. In this article, the first experiment is conducted using a plastic pellet covered with thin ferromagnetic material. In the system, the digital-phase-lead-compensator takes the position-related signal and processes it to provide a driving signal for the magnetic suspender. The suspended pellet is irradiated by the Gekko XII laser, having its total energy 2700 J with pulse width 800 ps at the wavelength 0.53 μm. The X-ray pinhole photograph confirms the spherically symmetrical implosion at the pellet core. At irradiation, the neutron yield is also observed.

Analysis of electroless nickel thin films

1991 ◽  
Vol 49 ◽  
pp. 510-511 ◽  
Author(s):  
C. W. Price ◽  
E. F. Lindsey
Keyword(s):  
Thin Films ◽  
Inertial Confinement Fusion ◽  
Electroless Nickel ◽  
Inertial Confinement ◽  
Plating Bath ◽  
X Ray ◽  
Nickel Thin Films ◽  
Nickel Deposits ◽  
Confinement Fusion ◽  
Thickness Measurements

Thickness measurements of thin films are performed by both energy-dispersive x-ray spectroscopy (EDS) and x-ray fluorescence (XRF). XRF can measure thicker films than EDS, and XRF measurements also have somewhat greater precision than EDS measurements. However, small components with curved or irregular shapes that are used for various applications in the the Inertial Confinement Fusion program at LLNL present geometrical problems that are not conducive to XRF analyses but may have only a minimal effect on EDS analyses. This work describes the development of an EDS technique to measure the thickness of electroless nickel deposits on gold substrates. Although elaborate correction techniques have been developed for thin-film measurements by x-ray analysis, the thickness of electroless nickel films can be dependent on the plating bath used. Therefore, standard calibration curves were established by correlating EDS data with thickness measurements that were obtained by contact profilometry.

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