Materials data base and design equations for the UCLA solid breeder blanket

Abstract

and HA10-after 20 3 achieving a burnup of 3x10 captures/cm (after Hollenberg [2]). . 35 2 Volumetric swelling of LiAlO. exposed to = 5 MW/m of neutron wall loading as a function of irradiation time 39 2 Volumetric swelling of Li,0 exposed to 5 MN/m of neutron wall wall loading as a function of irradiation time 42 Blanket pin average steady state temperature as a function of distance from the first wall for a neutron wall loading of = 5 MW/m 2 45 Helium production in LiAlO, breeder pins as a function of distance from the. first wall 47 Average helium production in Be-rods as a function of distance from the first wall 48 Average volumetric swelling of LiAlO, breeder rods exposed to 2 5 MW/m neutron wall loading after 3 years of irradiation 49 2 Volumetric swelling of Be-rods exposed to 5 MW/m neutron wall loading after 1, 2, and 3 years of irradiation 50 TABLES Summary for blanket material properties current status (12/85) ... Estimates for bubble number densities and radii using above model and experimental swelling data for LiAlO. Experimental and analytical swelling results for LiAlO, for 500 i T 1 900°C 3S Experimental sw511ing and helium retention data for Li 0 iv 5. Estimate for bubble number densities and radii using the above model and experimental data for Li-O 6. Experimental and analytical swelling results for Li.O for 500 < T < 900°C 7. Experimental and analytical swelling results for Be irradiated to

Stable droplet generator for a high brightness laser produced plasma extreme ultraviolet source

“…19: ρ = 7056 kg/m 3 , σ = 560 mN/m, (∂ ρ/∂T) P = 0.57 kg/(m 3 K), (∂σ/∂T) P = 0.072 mN/(m K), which are close to values for pure tin and indium. 20,21 These values give us δ ρ/ρ| (δT =2K) = 1.6 × 10 −4 , δσ/σ| δT =2K = 2.5 × 10 −4 , thus δv j /v j ∼ 10 −4 both for density and surface tension variations.…”

Behaviour of helium after implantation in molybdenum

“…(1) and (2) with f(x,n) the distribution density of the bubbles containing x helium atoms and composed of n vacancies. A numerical method for solving FP's equations has been proposed and implemented in [20,21]. This is a time expensive calculation which may not be appropriate with a long scale diffusion problem.…”

“…(19), (20), and (11). The first annealing sequence can provide an order of magnitude of the two parameters l and L. Indeed to be consistent with the value of the 'first release' (3%), l, L and R 0 (the bubble radius at the beginning of the second annealing sequence) are in relation: the sink strength of the free surface m 1 must be in the same order of magnitude as the sink strength of the bubbles m 2 .…”

Molecular dynamics calculations for low-energy helium atoms on a nickel surface

“…The replacement of the interstitial helium atom with a pre-existent lattice vacancy cancels the strain field almost completely: therefore, the binding energy of the helium atom with a vacancy, is of the same order of magnitude of the heat of solution (E;+" = 2.1 eV [13]). The fact that the substitutional position for heliumisenergetically favourable with respect to the interstitial one originates a very efficient 'trapping' mechanism, exerted by lattice vacancies, which strongly affects the diffusive behaviour of helium atoms: in fact, they show a strong tendency to fill vacancies and form clusters.…”

“…The fact that the substitutional position for heliumisenergetically favourable with respect to the interstitial one originates a very efficient 'trapping' mechanism, exerted by lattice vacancies, which strongly affects the diffusive behaviour of helium atoms: in fact, they show a strong tendency to fill vacancies and form clusters. The migration energy of interstitial helium ( E P = 0.1 eV [13] f E? = 0.35 eV [14]) has been found experimentally lower than that of substitutional helium, EF > 3 eV [l].…”