Continuous-phase diffractive optical element to realize uniform target illumination in inertial confinement fusion (ICF)

1999 ◽  
Author(s):  
Qiaofeng Tan ◽  
Yingbai Yan ◽  
Guofan Jin ◽  
Minxian Wu
Keyword(s):  
Inertial Confinement Fusion ◽  
Optical Element ◽  
Continuous Phase ◽  
Diffractive Optical Element ◽  
Inertial Confinement ◽  
Confinement Fusion

scholarly journals Study on the frontal condition for continuous phase plate in inertial confinement fusion driver

2009 ◽  
Vol 58 (5) ◽  
pp. 3130
Author(s):  
Yao Xin ◽  
Gao Fu-Hua ◽  
Zhang Yi-Xiao ◽  
Wen Sheng-Lin ◽  
Guo Yong-Kang ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Continuous Phase ◽  
Phase Plate ◽  
Inertial Confinement ◽  
Confinement Fusion

Thermal Transfiguration Analysis for the Large Aperture Optical Element of Switchyard in ICF Driver Target Area

2010 ◽  
Author(s):  
Yi Zhou ◽  
Ping Yang ◽  
Junwei Zhang ◽  
Hai Zhou
Keyword(s):  
Temperature Distribution ◽  
Temperature Difference ◽  
Inertial Confinement Fusion ◽  
Optical Element ◽  
Element Model ◽  
Target Area ◽  
Inertial Confinement ◽  
Optical Elements ◽  
Large Aperture ◽  
Confinement Fusion

Temperature gradient is one of the most important factors that cause large deformation of the large aperture optical element in an inertial confinement fusion (ICF) laser driver. In this study, we measured the ambient temperature around the laser switchyard and analyzed the temperature distribution and changing characteristics over time. The results indicated that variation trends of temperature inside the switchyard was almost the same, the temperature gradients of the uppermost part were higher than the bottom, and the temperatures in the centre were higher than both sides. Loading the temperature profile into the finite element model of the switchyard showed that the deformation of the optical element changed with time. The results indicate that temperature distribution has a great impact on the optical elements, and it attains the design objective of being smaller than 0.24urad and contents with the requirement of shooting practice when temperature difference is about 0.01°C or partial temperature difference inside the switchyard is about 0.1°C.

Measurement of large optical elements used for inertial confinement fusion with ptychography

2017 ◽  
Vol 6 (6) ◽  
Author(s):  
Xue Dong ◽  
Haiyan Wang ◽  
Cheng Liu ◽  
Hua Tao ◽  
Jianqiang Zhu
Keyword(s):  
Inertial Confinement Fusion ◽  
Focal Length ◽  
Transmission Function ◽  
Surface Profile ◽  
Continuous Phase ◽  
Phase Plate ◽  
Inertial Confinement ◽  
Optical Elements ◽  
Confinement Fusion ◽  
Laser Drivers

AbstractHigh-power laser drivers are located in huge laser facilities built for inertial confinement fusion, and have achieved important progresses in the past decade; however, many unconventional optical elements implemented still cannot be accurately measured. To solve this problem, the ptychographic iterative engine (PIE), which is a recently developed technique that can detect both the phase and modulus of the light field simultaneously, is adopted to measure the transmission function of these optical elements and then to accurately characterize their key parameters. The distinctive advantage of PIE over other traditional metrology techniques in measuring large optical elements is demonstrated in this paper by detecting the focal length of a lens array and the surface profile of a continuous phase plate.

Analysis of the Effect of Ambient Loads on the SG-III TIL Structure Stability

2008 ◽  
Author(s):  
Jun-wei Zhang ◽  
Hai Zhou ◽  
Dong-hui Lin ◽  
Yi Zhou ◽  
Feng Jing ◽  
...  
Keyword(s):  
Optical System ◽  
Inertial Confinement Fusion ◽  
Large Scale ◽  
Optical Element ◽  
Element Model ◽  
Ambient Vibration ◽  
Structure Stability ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Precision Temperature

ICF (Inertial Confinement Fusion) drivers are large-scale precision optical facilities. Structure stability is an important design index for ICF drivers and it has a direct influence on the quality of beam shooting. The total positioning error budget designed for the SG-III Technical Integration Experiment Line (TIL) built in China is 30 micrometers (μm) at the target plane or its equivalent, among which the allocated stability budget is 27μm and the translation of a single optical element should be less than 1μm under the effect of ambient loads. Based on the previous evaluation of the TIL environment, the microvibration and thermal load are two main factors which can affect stability of the optical system. To obtain the data of the two ambient loads, acceleration seism sensors and high precision temperature sensors are used to measure the ambient vibration and temperature change for a long time. The finite element model is then built for a typical optical element and its support structure and the measured loads are exerted on the model to obtain the response of the optical system. The results show that both stability of a single optical element and stability of the laser beam can satisfy the designed index. This research is very helpful for the building of the SG-III main facility.

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.

scholarly journals Pulsed power indirect drive approach to inertial confinement fusion

2020 ◽  
Vol 36 ◽  
pp. 100749 ◽  
Author(s):  
R.E. Olson ◽  
R.J. Leeper ◽  
S.H. Batha ◽  
R.R. Peterson ◽  
P.A. Bradley ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Pulsed Power ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Indirect Drive

Shell mass effect on the hot-spot pressure in inertial confinement fusion implosion

2021 ◽  
Vol 28 (3) ◽  
pp. 032713
Author(s):  
Dongguo Kang ◽  
Huasen Zhang ◽  
Shiyang Zou ◽  
Wudi Zheng ◽  
Shaoping Zhu ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Hot Spot ◽  
Mass Effect ◽  
Inertial Confinement ◽  
Shell Mass ◽  
Confinement Fusion
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