Influence of High Energy Particles on Copper and Stainless Steel in Fusion Reactor Materials

Many studies were focused on the effect of fusion plasma particles onto the structural materials of future nuclear fusion reactor. In this paper, the effect of the products of the first generation fuel reaction on structural fusion materials as copper and 316-stainless steel target materials was studied. Firstly, the effect of 14.1 MeV neutrons produced from D-T neutron generator for different irradiation time equal to 10, 20, 30, 50 and 60 minutes was investigated. Hence, this effect was analyzed and characterized by X-ray diffration analysis, surface roughness tester, scanning electron microscope and Vickers hardness. Secondly, the effect of 3.5 MeV α-particles on these target materials by different incident angles equal to 0°, 30°, 45°, 60° and 85° using SRIM code was studied. Also, SRIM code was used for calculation α-particles trajectories, projected and straggle ranges, skewness, kurtosis, target ionization / phonons and total displacements for copper and 316- stainless steel target materials.

Advance of CSNS Solid Target

A 100 kW solid target was successfully developed for the CSNS phase one. Tungsten was selected as the CSNS target material and a layer of tantalum with a thickness of only 0.3mm as a protective layer. Eleven target blocks were fixed in parallel in a stainless steel target container with 1.2mm gap between each block. Using a specially designed spreader, the target plug can be easily replaced. The parameters of the target were stable and normal in the course of more than a year of operation, the temperature rise of the target cooling water inlet and outlet increased as the proton beam power increased.

Измерения абсолютных значений интенсивности излучения в диапазоне длин волн 6.6-32 nm мишени из нержавеющей стали при импульсном лазерном возбуждении

The paper presents experimental data on the absolute values ​​of the radiation intensity in the wavelength range of 6.6-32 nm for a stainless steel target excited by a Nd: YAG laser with parameters λ = 1064 nm, Еpulse = 0.45 J, τ = 4 ns, ν = 10 Hz. The results are of interest for various applications using laboratory laser-plasma sources of soft X-ray and extreme ultraviolet radiation.

EFFECT OF SPECIMEN DIAMETER ON WELDABILITY OF IMPAT WELDING

Impact welding has been carried out using a projectile having a diameter of 11 and 5 mm at an impact velocity of 200 m/s or more. A large projectile regardless of the slenderness ratio, was welded to a stainless steel target. However, only a small projectile with a slenderness ratio less than 1.2 was welded to the same target. In order to examine the effect of the diameter of the projectile on the weldability, the temperature elevating process in two cylindrical projectiles subjected to a longitudinal impact was evaluated numerically using LS-DYNA. The numerical results indicated that since the deformation mechanism of a projectile with a slenderness ratio less than 1.0 is different of that of the projectile with the slenderness ratio more than 1.5, the small projectile with the slenderness ratio less than 1.0 can be welded to the target.