P.Sonato & P.Testoni Electromagnetic and Mechanical stresses in the ITER-ICRH Antenna EFDA Contract...

P.Sonato & P.Testoni

Electromagnetic and Mechanical stresses in the ITER-ICRH Antenna

EFDA Contract 03-1132 Sub-task 3.3.(II)

Progress Report: 22 02 2005

P.Sonato & P.Testoni*Consorzio RFX

EURATOM-ENEA Association for FusionPadova (Italy)

*DIEE – University of Cagliari


New Model with blankets

0.9 m

1.7 m

0.3 m

• Vessel and Port thickness= 12 cm

• Plug thickness= 8 cm

• Overall dimensions in agreement with vessel and blancket design

– No contact resistance between faraday shield and Plug

– No contact resistance between Plug wall and Neutron Shield (Bulk)

– No radial cuts on the Plug


Transients

• Worse Disruption scenario:

– Disruption Type B:• linear quench of 40

ms• exponential decay

with time constant of 18 ms

• Linear quench:– Poloidal field variation:

16 T/s starting from 0.65 T in 40 ms

– Radial field variation: 2.5 T/s starting from 0.1 T in 40 ms

• Exponential quench:– Poloidal field variation:

Bo*e-t/• Bo = 0.65 T• = 0.018s

Current [A] in the plug

050000

100000150000200000250000300000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current [A] in the plug

0

50000

100000

150000

200000

250000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current [A] in the Faraday Screen

0100000200000300000400000500000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current [A] in the Faraday Screen

050000100000150000200000

250000300000350000400000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current [A] in the Bulk

0

20000

40000

60000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current [A] in the Bulk

0

10000

20000

30000

40000

50000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Linear Exponential


Poloidal Field

Variation


Electromagnetic analysis

– Poloidal field variation: 16 T/s starting from 0.65 T in 40 ms

• Poloidal field applied inside the VV: shielding effect

Neutron shield

Plate– Field in the plug: in the central zone

of the plug where the central transmission line is housed

– Field variation in the capacitor or transmission line regions:

– Maximum: 0.15T/40ms -> 3.75T/s

– Mean: 0.08T/40ms -> 2 T/s

P

L

A

S

M

A

S

I

D

E

P

L

A

S

M

A

S

I

D

E


Toroidal Current versus time distribution

Current in the plug

0

50000

100000

150000

200000

250000

300000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current in the Bulk

0

10000

20000

30000

40000

50000

60000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

Current in the Faraday Screen

050000

100000150000200000250000300000350000400000450000500000

0 4 8 12 16 20 24 28 32 36 40

Time [ms]

No substantial difference with the model without blanket modules


Mechanical analysis with uniform static fields

Static fields for the force evaluation: Brad = 0 T Bpol = 1.5 T Btor = 4 T

Poloidal variation

Torque [MN·m]

Mrad 7.1

Mpol 0

Mtor 0

With Blanket

Force [MN]

Frad 0.57 Without Blanket

Torque [MN·m]

Mrad 6.7

Mpol 0

Mtor 0

Force [MN]

Frad 0.52


Mechanical analysis with static fields varying with R

Static fields for force evaluation: Bpol varies linearly

between 1.5T and 1T

Btor varies with R till 1.5 m and after linearly to zero

2.8 m

1.5 m

Btor 4 T

3.38 TR1

Bpol 1.5 T

1 T



Poloidal variation

Torque [MN·m]

Mrad 6.7

Mpol 0

Mtor 0

Variable static fields

Force [MN]

Frad 0.52

Uniform static fields

Torque [MN·m]

Mrad 5.4

Mpol 0

Mtor 0

Force [MN]

Frad 0.6


Radial Field

Variation


Electromagnetic analysis Radial Variation

– Radial field variation: 2.5 T/s starting from 0.1 T in 40 ms

Neutron shield

Plate– Field in the plug: in the central

zone of the plug where the central transmission line is housed

– Field variation in the capacitor or transmission line regions:

– Maximum: 0.05T/40ms -> 1.25 T/s

– Mean: 0.03T/40ms -> 0.75 T/s

P

L

A

S

M

A

S

I

D

E

P

L

A

S

M

A

S

I

D

E


Current density distribution

• With blanket • Without blanket

Plug

Bulk

F Screen

109 kA

15 kA

74 kA

98 kA

11 kA

55 kA

Bigger currents with the blanket, expecially in the front of the antenna


Mechanical analysis with uniform static fields

Static fields for the force evaluation: Brad = 0T Bpol = 1.5 T Btor = 4 T

Radial variation

Torque [MN·m]

Mrad 0

Mpol 1.6

Mtor 0.6

Torque [MN·m]

Mrad 0

Mpol 1.9

Mtor 0.7

With Blanket Without Blanket



Radial variation

Torque [MN·m]

Mrad 0

Mpol 1.3

Mtor 0.6

Variable static fields

Uniform static fields

Torque [MN·m]

Mrad 0

Mpol 1.9

Mtor 0.7


Work still to be done

• Electromechanical analysis of transmission line and 4-Port Junction for the external matching option including electrical straps (will be done April-June)

• Proposal for Assessment of the Faraday screen (activity 2005-07):– Constraints– necessity to include resistances– geometry

P.Sonato & P.Testoni Electromagnetic and Mechanical stresses in the ITER-ICRH Antenna EFDA Contract...

Documents

Transcript of P.Sonato & P.Testoni Electromagnetic and Mechanical stresses in the ITER-ICRH Antenna EFDA Contract...