scholarly journals Surface Contaminant Control Technologies to Improve Laser Damage Resistance of Optics

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaofeng Cheng ◽  
Xinxiang Miao ◽  
Hongbin Wang ◽  
Lang Qin ◽  
Yayun Ye ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
High Energy ◽  
Intense Laser ◽  
Metallic Surface ◽  
Inertial Confinement ◽  
Contamination Control ◽  
Laser Driver ◽  
Laser Facility ◽  
Laser Induced Damage

The large high-power solid lasers, such as the National Ignition Facility (NIF) of America and the Shenguang-III (SG-III) laser facility of China, can output over 2.1 MJ laser pulse for the inertial confinement fusion (ICF) experiments. Because of the enhancement of operating flux and the expansion of laser driver scale, the problem of contamination seriously influences their construction period and operation life. During irradiation by intense laser beams, the contaminants on the metallic surface of beam tubes can be transmitted to the optical surfaces and lead to damage of optical components. For the high-power solid-state laser facilities, contamination control focuses on the slab amplifiers, spatial filters, and final-optical assemblies. In this paper, an effective solution to control contaminations including the whole process of the laser driver is put forward to provide the safe operation of laser facilities, and the detailed technical methods of contamination control such as washing, cleanliness metrology, and cleanliness protecting are also introduced to reduce the probability of laser-induced damage of optics. The experimental results show that the cleanliness level of SG-III laser facility is much better to ensure that the laser facility can safely operate at high energy flux.

scholarly journals Efficient acceleration of a dense plasma projectile to hyper velocities in the laser-induced cavity pressure acceleration scheme

2018 ◽  
Vol 36 (1) ◽  
pp. 49-54
Author(s):  
J. Badziak ◽  
E. Krousky ◽  
J. Marczak ◽  
P. Parys ◽  
T. Pisarczyk ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Confinement ◽  
Cavity Pressure ◽  
Laser Driver ◽  
Confinement Fusion ◽  
Laser Facility ◽  
Moderate Energy ◽  
The Impact

AbstractThe experimental study of the plasma projectile acceleration in the laser-induced cavity pressure acceleration (LICPA) scheme is reported. In the experiment performed at the kilojoule PALS laser facility, the parameters of the projectile were measured using interferometry, a streak camera and ion diagnostics, and the measurements were supported by two-dimensional hydrodynamic simulations. It is shown that in the LICPA accelerator with a 200-J laser driver, a 4-μg gold plasma projectile is accelerated to the velocity of 140 km/s with the energetic acceleration efficiency of 15–19% which is significantly higher than those achieved with the commonly used ablative acceleration and the highest among the ones measured so far for any projectiles accelerated to the velocities ≥100 km/s. This achievement opens the possibility of creation and investigation of high-energy-density matter states with the use of moderate-energy lasers and may also have an impact on the development of the impact ignition approach to inertial confinement fusion.

scholarly journals Observation of a high degree of stopping for laser-accelerated intense proton beams in dense ionized matter

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jieru Ren ◽  
Zhigang Deng ◽  
Wei Qi ◽  
Benzheng Chen ◽  
Bubo Ma ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Dominant Role ◽  
Dense Matter ◽  
High Energy ◽  
Fast Ignition ◽  
High Energy Density ◽  
Intense Laser ◽  
High Yield ◽  
Inertial Confinement ◽  
Proton Beams

Abstract Intense particle beams generated from the interaction of ultrahigh intensity lasers with sample foils provide options in radiography, high-yield neutron sources, high-energy-density-matter generation, and ion fast ignition. An accurate understanding of beam transportation behavior in dense matter is crucial for all these applications. Here we report the experimental evidence on one order of magnitude enhancement of intense laser-accelerated proton beam stopping in dense ionized matter, in comparison with the current-widely used models describing individual ion stopping in matter. Supported by particle-in-cell (PIC) simulations, we attribute the enhancement to the strong decelerating electric field approaching 1 GV/m that can be created by the beam-driven return current. This collective effect plays the dominant role in the stopping of laser-accelerated intense proton beams in dense ionized matter. This finding is essential for the optimum design of ion driven fast ignition and inertial confinement fusion.

Autonomous pulse shaping method for inertial confinement fusion high power laser facility

2020 ◽  
Vol 161 ◽  
pp. 111983
Author(s):  
Xiaoxia Huang ◽  
Xuewei Deng ◽  
Wei Zhou ◽  
Huaiwen Guo ◽  
Bowang Zhao ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Pulse Shaping ◽  
Inertial Confinement ◽  
High Power Laser ◽  
Power Laser ◽  
Confinement Fusion ◽  
Laser Facility

scholarly journals Laser performance of the SG-III laser facility

2016 ◽  
Vol 4 ◽  
Author(s):  
Wanguo Zheng ◽  
Xiaofeng Wei ◽  
Qihua Zhu ◽  
Feng Jing ◽  
Dongxia Hu ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Laser System ◽  
Power Balance ◽  
Inertial Confinement ◽  
Fusion Research ◽  
Laser Performance ◽  
Laser Driver ◽  
Confinement Fusion ◽  
Laser Facility ◽  
Better Than

SG-III laser facility is now the largest laser driver for inertial confinement fusion research in China. The whole laser facility can deliver 180 kJ energy and 60 TW power ultraviolet laser onto target, with power balance better than 10%. We review the laser system and introduce the SG-III laser performance here.

StarDriver: A Flexible Laser Driver for Inertial Confinement Fusion and High Energy Density Physics

2014 ◽  
Vol 33 (5) ◽  
pp. 476-488 ◽  
Author(s):  
David Eimerl ◽  
E. Michael Campbell ◽  
William F. Krupke ◽  
Jason Zweiback ◽  
W. L. Kruer ◽  
...  
Keyword(s):  
Energy Density ◽  
Inertial Confinement Fusion ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Confinement ◽  
High Energy Density Physics ◽  
Laser Driver ◽  
Confinement Fusion

scholarly journals New high-power laser facility PALS—prospects for laser–plasma research

1999 ◽  
Vol 17 (2) ◽  
pp. 179-194 ◽  
Author(s):  
B. RUS ◽  
K. ROHLENA ◽  
J. SKÁLA ◽  
B. KRÁLIKOVÁ ◽  
K. JUNGWIRTH ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Radiation Transport ◽  
Laser System ◽  
Main Beam ◽  
Inertial Confinement ◽  
X Ray ◽  
Multiple Pulse ◽  
Laser Facility ◽  
Under Construction

In this paper, we report on a new laser facility called PALS (Prague Asterix Laser System), which is currently under construction, and which will house the high-power iodine laser Asterix IV. Upon its completion in late 1999, the PALS facility will be capable of providing single- or multiple-pulse irradiation with a variable pulse duration ranging from 100 to 500 ps. Wavelengths available will be 1.315 μm, 658 nm, and 438 nm. The system will provide one main beam with energy up to 1200 J and two smaller auxiliary beams with a combined energy of up to 100 J. A wide variety of geometries and variable pulse timings is available. We assess PALS' potential for investigating the physics of laser plasmas in inertial confinement fusion, the development and applications of X-ray lasers, X-ray spectroscopy, and radiation transport, using multiple-pulse and extended beam capability.

Optical Surface Cleanliness Inspection, Degradation and Maintaining in High Power Laser System

2013 ◽  
Vol 765-767 ◽  
pp. 2288-2293
Author(s):  
Bao Xu Wang ◽  
Mei Cong Wang ◽  
Ming Zhi Zhu ◽  
Xiao Juan Chen ◽  
Wen Kai Wu
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
High Energy Physics ◽  
Laser System ◽  
High Energy ◽  
Inertial Confinement ◽  
Optical Surface ◽  
High Power Laser ◽  
Power Laser ◽  
High Power Laser System

High Power Laser System (HPLS) is a large optical instrument, provides extremely high temperature and pressure conditions for inertial confinement fusion (ICF) and high-energy-physics research. It contains large number of optics and which would be easily damaged due to high fluence of laser power. The contamination control of optical surfaces has a great significance to ensure the performance of the system and decrease costs. This paper discussed the background and development of cleanliness control techniques in high power laser systems, including contamination induced laser damage (CILD), contamination inspection, optical surface cleanliness degradation and maintaining.

scholarly journals Sources and space–time distribution of the electromagnetic pulses in experiments on inertial confinement fusion and laser–plasma acceleration

2020 ◽  
Vol 379 (2189) ◽  
pp. 20200022 ◽  
Author(s):  
F. Consoli ◽  
P. L. Andreoli ◽  
M. Cipriani ◽  
G. Cristofari ◽  
R. De Angelis ◽  
...  
Keyword(s):  
Electromagnetic Fields ◽  
High Power ◽  
Laser Plasma ◽  
Inertial Confinement Fusion ◽  
High Energy ◽  
Inertial Confinement ◽  
Plasma Acceleration ◽  
Electromagnetic Pulses ◽  
Confinement Fusion ◽  
Laser Plasma Acceleration

When high-energy and high-power lasers interact with matter, a significant part of the incoming laser energy is transformed into transient electromagnetic pulses (EMPs) in the range of radiofrequencies and microwaves. These fields can reach high intensities and can potentially represent a significative danger for the electronic devices placed near the interaction point. Thus, the comprehension of the origin of these electromagnetic fields and of their distribution is of primary importance for the safe operation of high-power and high-energy laser facilities, but also for the possible use of these high fields in several promising applications. A recognized main source of EMPs is the target positive charging caused by the fast-electron emission due to laser–plasma interactions. The fast charging induces high neutralization currents from the conductive walls of the vacuum chamber through the target holder. However, other mechanisms related to the laser–target interaction are also capable of generating intense electromagnetic fields. Several possible sources of EMPs are discussed here and compared for high-energy and high-intensity laser–matter interactions, typical for inertial confinement fusion and laser–plasma acceleration. The possible effects on the electromagnetic field distribution within the experimental chamber, due to particle beams and plasma emitted from the target, are also described. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

scholarly journals Surface phase defects induced downstream laser intensity modulation in high-power laser facility

2016 ◽  
Vol 4 ◽  
Author(s):  
Xin Zhang ◽  
Wei Zhou ◽  
Wanjun Dai ◽  
Dongxia Hu ◽  
Xuewei Deng ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Intensity Modulation ◽  
Inertial Confinement ◽  
Surface Phase ◽  
High Power Laser ◽  
Power Laser ◽  
Laser Facility ◽  
Manufacturing Techniques ◽  
Facility Construction

Optics surface phase defects induced intensity modulation in high-power laser facility for inertial confinement fusion research is studied. Calculations and experiments reveal an exact mapping of the modulation patterns and the optics damage spot distributions from the surface phase defects. Origins are discussed during the processes of optics manufacturing and diagnostics, revealing potential improvements for future optics manufacturing techniques and diagnostic index, which is meaningful for fusion level laser facility construction and its operation safety.

Sign in / Sign up

Export Citation Format

Share Document