scholarly journals Constraints on target chamber first wall and target designs that will enable NIF debris shields to survive

Author(s):  
Alan K. Burnham ◽  
Michel Gerassimenko ◽  
J. M. Scott ◽  
Jeff F. Latkowski ◽  
Pamela K. Whitman ◽  
...  
Keyword(s):  
Author(s):  
L. Bianchi ◽  
P. Brelivet ◽  
A. Freslon ◽  
A. Fornier ◽  
C. Cordillot ◽  
...  

Abstract The french laser megajoule (LMJ) is designed to produce, in laboratory, fusion energy with a significant gain. Such an energy could be achieved by imploding a small capsule filled with a DT mixture. Fusion experiments produce a large emission of neutrons, x-rays, laser scattered light and debris which impose a first wall protection for the laser target chamber made of a low Z and refractory material. As boron carbide appeared to be a good candidate, among others, it was decided to evaluate the potentiallity of plasma sprayed B4C coatings for this application. This paper deals with the optimization of plasma spraying conditions to built up coatings which satisfie specifications required for the first wall. Coating general properties are presented as well as outgassing performances. Specific x-ray and laser tests were performed to evaluate coating behavior close to real LMJ working conditions.


1999 ◽  
Author(s):  
Christelle Dubern ◽  
J.-L. Bruneel ◽  
Patrick Chadeyron ◽  
C. Cordillot ◽  
M. Couzi ◽  
...  

Author(s):  
J.J. MacFarlane ◽  
G.A. Moses ◽  
R.R. Peterson ◽  
I.N. Sviatoslavsky

1997 ◽  
Author(s):  
Luc Bianchi ◽  
Paul Lucchese ◽  
Patrick Chadeyron

Author(s):  
E. Ruedl ◽  
P. Schiller

The low Z metal aluminium is a potential matrix material for the first wall in fusion reactors. A drawback in the application of A1 is the rel= atively high amount of He produced in it under fusion reactor conditions. Knowledge about the behaviour of He during irradiation and deformation in Al, especially near the surface, is therefore important.Using the TEM we have studied Al disks of 3 mm diameter and 0.2 mm thickness, which were perforated at the centre by double jet polishing. These disks were bombarded at∽200°C to various doses with α-particles, impinging at any angle and energy up to 1.5 MeV at both surfaces. The details of the irradiations are described in Ref.1. Subsequent observation indicated that in such specimens uniformly distributed He-bubbles are formed near the surface in a layer several μm thick (Fig.1).After bombardment the disks were deformed at 20°C during observation by means of a tensile device in a Philips EM 300 microscope.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiangbin Wei ◽  
Qiwu Shi ◽  
Lidan Xiong ◽  
Guang Xin ◽  
Tao Yi ◽  
...  

AbstractThe experiment of inertial confinement fusion by the “ShengGuang (SG)-III” prototype laser facility is a transient and extreme reaction process within several nanoseconds, which could form a very complicated and intense electromagnetic field around the target chamber of the facility and may lead to harmful effect on people around. In particular, the biological effects arising from such specific environment field could hardly be ignored and have never been investigated yet, and thus, we reported on the investigation of the biological effects of radiation on HaCat cells and PC12 cells to preliminarily assess the biological safety of the target range of the "SG-III" prototype laser facility. The viability revealed that the damage of cells was dose-dependent. Then we compared the transcriptomes of exposed and unexposed PC12 cells by RNA-Seq analysis based on Illumina Novaseq 6000 platform and found that most significantly differentially expressed genes with corresponding Gene Ontology terms and pathways were strongly involved in proliferation, transformation, necrosis, inflammation response, apoptosis and DNA damage. Furthermore, we find increase in the levels of several proteins responsible for cell-cycle regulation and tumor suppression, suggesting that pathways or mechanisms regarding DNA damage repair was are quickly activated. It was found that "SG-III" prototype radiation could induce DNA damage and promote apoptotic necrosis.


2021 ◽  
Vol 27 ◽  
pp. 100978
Author(s):  
M. Moscheni ◽  
M. Carr ◽  
S. Dulla ◽  
F. Maviglia ◽  
A. Meakins ◽  
...  

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