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.

General Structure Layout and Design of Target Area of SGIII Facility

2013 ◽  
Vol 765-767 ◽  
pp. 286-290
Author(s):  
Ming Zhi Zhu ◽  
Xiao Juan Chen ◽  
Mei Cong Wang ◽  
Wen Kai Wu ◽  
Gang Chen ◽  
...  
Keyword(s):  
Structural Design ◽  
Inertial Confinement Fusion ◽  
General Structure ◽  
Target Chamber ◽  
Target Area ◽  
Inertial Confinement ◽  
Optical Elements ◽  
Confinement Fusion ◽  
Mechanical Elements ◽  
Structure Layout

ShenGuang III (SGIII) facility will be constructed for research in Inertial Confinement Fusion. In this paper, general structure layout and design of target area of SGIII facility are described. Target area structure support system must provide a stable and precisely platform for optical elements before and during a shot. General structure layout must satisfy the mul-function consideration and logistic priority. The modularity and hardware commonality, cleanliness, and low neutron activation should be considered in the structural design of target area. The general structure layout of target area is rectangle. The target bay and the switchyard have the multi-layered layout to satisfy the demand of transporting beam lasers unidirectionally from south to north and supporting the optics modules and physical diagnostic instruments with different height. The passageways of population & goods flow of target area are designed to include the vertical channels between the different layers and the horizontal channels on the same layer. The opto-mechanical elements (OM) are classified as OM1, OM2, and OM3. The OM1 are the infrastructures. The OM2 include target chamber, the shell of final optics assemblies, the mirror frames, and the beam enclosures. The OM3 is line replaceable units that are attached to the OM2 on kinematic equivalent three-vee mounts.

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.

Performance of a prototype for a large-aperture multipass Nd:glass laser for inertial confinement fusion

1997 ◽  
Vol 36 (21) ◽  
pp. 4932 ◽  
Author(s):  
Bruno M. Van Wonterghem ◽  
John R. Murray ◽  
Jack H. Campbell ◽  
D. Ralph Speck ◽  
Charles E. Barker ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Large Aperture ◽  
Confinement Fusion ◽  
Nd:Glass Laser

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.

Performance of large-aperture optical switches for high-energy inertial-confinement fusion lasers

1995 ◽  
Vol 34 (24) ◽  
pp. 5312 ◽  
Author(s):  
Mark A. Rhodes ◽  
B. Woods ◽  
J. J. DeYoreo ◽  
D. Roberts ◽  
L. J. Atherton
Keyword(s):  
Inertial Confinement Fusion ◽  
High Energy ◽  
Optical Switches ◽  
Inertial Confinement ◽  
Large Aperture ◽  
Confinement Fusion
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