J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 1

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Design Review Plasma Vessel

The Plasma Vessel Support StructureHorizontal Support

by Mr. J. ReichWendelstein 7-XBasismaschine

Department Cryostat

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 2

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Horizontal support

1. Functions of the horizontal support

2. Centering of the plasma vessel

2.1. Global design

2.2. Forces on one point

2.3. Design of the centering points

3. Fine adjustment of the plasma vessel

3.1. Concept

4. Conclusions

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 3

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

1. Functions of the horizontal support

- Centering the plasma vessel

- Allow for the thermal expansion/contarction of the plasma vessel

- Fine adjustment of the plasma vessel within +- 5 mm

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 4

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

5 centering points fixed on the outer vessel

- fix global center

- radial movement possible

- no rotation possible

2. Centering of the plasma vessel

2.1. Global design- independent from the vertical support

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 5

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Detail of a centering point

AEU-port(without bellows and dome)

plasma vessel

circle line

outer vessel

bracket with centering bar

Moving conditions:

Movement on a circle around the fixed-point

Centering bar with 2 swing bearings

(nearly a straight line)

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 6

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

PG

AG

Konsole undZentrierung am AG

10

3.1

8.1

8.1

3.1

angenommener Kraftvektor

ZP V

ZP I

ZP II

ZP III

ZP IV

2.2. Maximum force on the centering points (forces from vacuum, bellows, outer forces)

PG

AG

Konsole undZentrierung am AG

angenommener Kraftvektor

3.1 3.1

8.1 8.1

ZP V

ZP I

ZP II

ZP III

ZP IV

I. complete axial force on 1 point II. complete tangential force on 1 point

Maximum force:

145 KN/per centering point

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 7

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik2.3. Design of the centering point

- Redesign of the port AEU from a diagnostic to a supply port

- Port in two versions, round and oval

- 5 times, 1 per module,

- Location between two modules

port AEU 10/20

Port AEU 30/40/50

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 8

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Assembly situation on the outer vessel

oval port AEU

centering bar

bracket on the outer vessel, fixed-point

dome on the outer vessel

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 9

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Maximum stress in the welding seam:

~220 MPa <= 225 MPa(RP1,0 at 150°C)

Maximum bending:

~ 5 mm

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 10

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik3. Fine adjustment of the plasma vessel

3.1. ConceptBasic points:

- Movement of the plasma vessel within a cube

- Length of each side of the cube is 10 mm, => ±5 mm

- Adjustment at a time can only be done by axial movement of 1 port, it requires that

all others centering bars are disconnected from the brackets

- Consequent load of this port in 1 direction (tensile/pressure loading)

- at least 2 guideways in order to keep the plasma vessel in right position

- Fixed-points for movement and guideways on the outer vessel

- Before adjustment measurement of the plasma vessel position (maybe it must be a combination of various moving steps to reach the final position)

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 11

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Picture of the concept

PG

AG

Konsole am AG

VP I

FP I

FP II

Führungspunkte ohneaktive Verstelleinheit

Justagepunkt mit aktiver linearer Verstelleinheit

guideway 1

Moving point, all loads in axial direction

guideway 2

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 12

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

Detail of a moving point

AEU-port(without bellows and dome)

plasma vessel

outer vessel

bracket with centering bar

linear motion and fixed point

Maximum forces for movement on one point:

100% of static friction (axial)

(1300 KN x 0.2 = 260 KN)

47% of the centering force

(300 KN x 0,47 = 141 KN)

Maximum stress in welding seam: 185 MPa

J. Reich, W7-X Basismaschine Design Review Plasma Vessel and Ports3.-4. März 2004

Folie 13

WENDELSTEIN 7-X

Basismaschine

Design Review Plasma Vessel Max-Planck-Institut für Plasmaphysik

1.6. Conclusions

Centering of the plasma vessel and absorption of the movements due to the thermal contraction can be done by the 5 AEU-ports.

The fine adjustment of the plasma vessel within narrow tolerances can be done by ports, too. Final solution depends on the forces from the vertical support (friction factor) and the assembling situation on the outer vessel (available space).

Further investigations on the movement concept are necessary (design, FEM-calculation).