PRESENTATION OF LITHUANIA

1
PRESENTATION OF LITHUANIA
Subject FIRST-WALL MATERIALS by prof. L.
Pranevicius

• The collaborative research
• - Lithuanian Energy institute
• - Kaunas University of Technology
• - Vytautas Magnus University (Kaunas)
• - Laboratory of Physical Metallurgy, Poitiers
  University (France).
• Contact person in LITHUANIA Prof. Liudvikas
  PRANEVICIUS
• Vice-Rector for Science, Vytautas Magnus
  University
• Fax [phone], Tel. [phone]
• E-mail Liudvikas_Pranevicius_at_fc.vdu.lt
• Contact person in FRANCE Prof. Claude TEMPLIER
• Laboratory of Physical Metallurgy, Poitiers
  university
• Fax [phone], Tel. [phone]
• E-mail Claude.Templier_at_univ-poitiers.fr

2
Title Accumulation of hydrogen in multielemental
and multilayered thin films under high-flux,
low-energy H2(H) irradiation modeling and
experiment
First-wall materials, LITHUANIA

• Goals
• - to study the behavior of H in metastable
  (amorphous, nanocrystalline) thin films doping
  effects
• - to study the role of very surface (oxide
  layer, impurities) on the mechanism of H
  retention.

3
Experimental technique
First-wall materials, LITHUANIA

• - Thin film vapour deposition technique
• - magnetron sputter deposition (Lt and F)
• - electron beam evaporation (Lt)
• - arc deposition (Lt)
• - high-flux plasma immersion ion implantation
  technique
• - low-energy (0.4-2 keV) PIII (Lt)
• - high-energy (10-30 keV) PIII (F)
• - characterization technique
• -composition SIMS (F), GDOS (Lt and F), XPS
  (F)
• -microstructure XRD (Lt and F), Low angle XRD
  (F)
• - surface topography AFM(F), profilometer (F)
• -properties
• -mechanical, such as, hardness, wear resistance
  (F)
• -hydrogen effusion and thermal desorption
  spectroscopy (LT).

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Research background
First-wall materials, LITHUANIA
1.L. Pranevicius, L.L. Pranevicius, D. Milcius,
S. Muzard, C. Templier, J.-P. Riviere,
Mass-transport driven by surface instabilities
under high-flux, low-energy nitrogen ion
irradiation at elevated temperatures, Vacuum 72
(2) (2003) 161-168. 2. E. Oliviero, M.L. David,
M.F. Beaufort, J. Nomgaudyte, L. Pranevicius, A.
Declémy, J.F.Barbot. Formation of bubbles by high
dose He implantation in 4H-SiC, Journal of
Applied Physics, 91, N 3 (2002) 1-8. 3. L.
Pranevicius, D. Milcius, C. Templier, J.-P.
Riviere, L.L. Pranevicius, Mass-transport driven
by atomic relocations under ion irradiation,
Surface Engineering, 18 (3) (2002) 182-187. 4. V.
Stankus, J. Dudonis, L. Pranevicius,
L.L.Pranevicius, D. Milcius, C. Templier, J.-P.
Riviere, On the mechanism of synthesis of PbTiO3
thin films by thermal annealing of Pb/Ti layers
in air at atmospheric pressure, Thin Solid Films,
426 (2003) 78-84 5. M.F. Beaufort, E. Oliviero,
M.L. David, J. Nomgaudyte, L. Pranevicius, A.
Declémy, J.F. Barbot. Defects induced by high
energy helium implantion in 4H-SiC, Nuclear
Instruments and Methods in Physics Research B,
186 (2002) 218-222. 6. L. Pranevicius, D.
Milcius, L.L. Pranevicius, C. Templier, V.
Sirvinskaite, R. Knizikevicius, Role of surface
instabilities in mixing and oxidation kinetics of
bilayered Y/Zr films at elevated temperature,
Surf. Appl. Sc., 225 (2004) 272-280. 7. L.
Pranevicius, D. Milcius, L.L. Pranevicius, G.
Thomas, Plasma hydrogenation of Al, Mg and MgAl
films under high-flux ion irradiation at elevated
temperature, J. Alloys Comp., (2004) in press.
5
Title Gas fluid dynamics and heat transfer in
short round bundles of fuel elements for helium
cooled blankets
Lithuanian Energy Institute, LITHUANIA, prof. E.
Uzpuras

• Task 1 Gas-cooled packings of spheres
• The objective is to determine the drag
  coefficients of annular packed beds of spherules
  with relative width of the annular slot varied
  from 1.07 to 1.75 of spheres diameter, as well as
  to measure heat transfer coefficient from the
  spherules depending on their positions with the
  bed. The experiments have been performed in axial
  flows of air at Re 500 to 35000, calculated on
  the basis of the velocity in the empty annulus.
• The experimental investigations of the hydraulic
  drag and fluid mixing for various types of
  packings from the spheres (regular rhombic or
  random) were performed. Both local and
  perimeter-average heat transfer coefficients from
  the cylinder vs. Re and the length of the heated
  part of the cylinder immersed in the sphere
  packing were determined.

Experimental section 1 outer pipe 2 ball
bearings 3 sphere-heater 4 flange plate
5 inner cylinder 6 distribution grid 7
hold-down ring 8 static-pressure tap
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Lithuanian Energy Institute, LITHUANIA

• Task 2 Smooth and rough channels
• The effect of variability of physical
  properties in the boundary layer on heat transfer
  and drag in flow over smooth and rough surfaces.
  The heat transfer and friction of a smooth
  cylinder in axial flow placed in a large-diameter
  circular pipe have been studied. The enhancement
  of heat transfer on rough surfaces and in rough
  channels at high-temperature gradients in the
  boundary layer have been registered.
• Task 3 Complex-geometry channels bundle
• The experimental and theoretical studies of the
  heat transfer inside an oval helical tube, the
  study of the unsteady process of heat carrier in
  a helical tube or fuel element bundle. All these
  experiments were performed during research
  projects for gas dynamics and heat transfer in
  fuel bundles of propulsion reactor for space
  applications.