Presentation in IAEA RUSFD vacuum vessel UST_2 12-10-2015

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Vacuum vessel for the
3D-printed UST_2 stellarator
Dr. Vicente Queral
National Fusion Laboratory
CIEMAT, Spain
Prague
Cz...

2
Outline
▪ Background
▪ Concept of the UST_2 vacuum vessel
▪ Alternative 1. Light-formed metal liner
▪ Alternative 2. Thi...

3
Background
 The work is developed in a framework of very low
funds. Up to now only private funds (6000 €)
have been obt...

4
• Designed, built and
operated by me from
2005 to 2007 in my
personal laboratory,
3000 €.
UST_1
facility
Toroidal millin...

5
Hints on UST_2 design
Sketch showing the elements and
geometrical concept of UST_2
Background
Elevation view
Plasma volu...

6
+
Resin casting, or other
material, in the internal
volume. The ‘mould’
remains attached to the
resin.
Light truss struc...

7
Concept of the UST_2
vacuum vessel

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 Easier construction in companies.
 Faster and more flexible
maintenance.
 Wide access through the ends of
the sector...

9
Several sectors joined by flanges
Concept of modular vacuum vessel
~ 700 mm
Flanges
Central VV Section
Curved VV
Sector

10
Sketch of the
liner/film concept
Fabrication approaches for the VV
1. Light-formed metal liner.
2. Thin electroformed m...

11
Alternative 1.
Light-formed metal liner

12
Shaping, fixing and Sn-Ag
soldering Cu strips (0.3 mm
thick) on the plaster form
Light-formed metal liner
Finished half...

13
Fixations to solder the
large flange on the
joined
Finished VV liner.
Prepared for initial
tightness tests
Soldering th...

14
Approach 1
Soldering external
claws (brass ball chain)
Curious picture of the
3D-printed mould for
epoxy resin casting ...

15
Installed liner epoxy reinforced VVAssembling

16
Vacuum vessel inside
half Coil frame
Two halves
of the Coil
frame
Closure with the
second half Coil
frame. Modular
vacu...

17
Half period finished and assembledAssembling

18
The vacuum vessel achieved ~ 10-2 Pa (poor vacuum due to
low conductance due to e-gun and poor vacuum cleaning and
cond...

19
2nd Alternative.
Ongoing R&D

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End cut
Thin electroformed metal liner
1. Flange attachment.
2. Optionally external epoxy
reinforcement, similarly to A...

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3rd Alternative.
Ongoing R&D

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SLA 3D-printed
internal surface
(‘liner’) of
Curved VV sector
Will try to lower cost keeping performance
Full flanges
a...

23
Option 3.2: 3Dformwork structure
Internal
metallic
film
Filling with
epoxy resin
Approach 3
Internal
reinforcement
bars...

24
Alternatives to create a metallic film
Approach 3
PVD = Physical vapour
deposition
 PVD. 10-2 Pa has to be achieved
pr...

25
Vacuum is
still too
poor (>10-2
Pa) to
attempt
PVD
Assembled
sector of VV
under
vacuum test
Approach 3 Internal film de...

26
 Decision about the more economical
alternative, for the same performance.
 Fabrication of the remaining Curved VV
se...

27
 The alternatives are simple and of
relatively low cost. But, still further
assays are required to validate the
concep...

29
More information in
www.fusionvic.org

Presentation in IAEA RUSFD vacuum vessel UST_2 12-10-2015

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