Task 4 hts material characterization dipole insert conceptual design
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Task 4 HTS material characterization & dipole insert conceptual design. Mélanie Bruchon, Maria Durante, Thibault Lécrevisse, Jean-Marc Gheller, Olivier Louchart, Jean-Michel Rey CEA/IRFU/SACM. HTS characterization. Superpower AMSC. HTS characterization. Superpower (with insulation).

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Task 4 HTS material characterization & dipole insert conceptual design

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Task 4 hts material characterization dipole insert conceptual design

Task 4HTS material characterization &dipole insert conceptual design

Mélanie Bruchon, Maria Durante, Thibault Lécrevisse, Jean-Marc Gheller, Olivier Louchart, Jean-Michel Rey

CEA/IRFU/SACM

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Hts characterization

HTS characterization

Superpower

AMSC

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Hts characterization1

HTS characterization

Superpower (with insulation)

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Hts characterization2

HTS characterization

Superpower (without insulation)

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Hts characterization3

HTS characterization

AMSC

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Hts characterization4

HTS characterization

What next ?

Cooling influence: what happens if we remove insulation?

Quench propagation: next study using compact solenoids. MPZ and MQE determination versus temperature.

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

6


Dipole design

Y

Dipole design

Bloc 1

Bloc 2

Bloc 3

X

20 mm beam tube

3 double pancakes

2 flat one

1 with bent end, each pancake symetrical / mid plane (only one tooling needed)

External winding diameter: 98 mm

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Dipole design1

Y

Dipole design

Bloc 1

Bloc 2

Bloc 3

X

Inner bore diameter: 20 mm

254 A/mm² needed to reach 6T

Peak field 6,1T

Fx = 47,8 kdaN

Fy = 78,5 kdaN

No Nb3Sn contribution

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Dipole design2

Y

Dipole design

Bloc 1

Bloc 2

Bloc 3

X

Conductor extrapolation

Using Superpower SCS 4050 @ 20 T and 10 K extrapolation: 520 A for a 4 mm wide.

Assuming 2 12 mm wide ribbons and 60% efficiency on one of them the critical current may be 2496 A.

Assuming 12 mm wide conductor of 0,4 mm thickness corresponding to 0,2 mm conductor + 0,1 mm tin + 0,1 mm kapton insulation the critical current density is 520 A/mm².

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

9


Dipole design3

Y

Dipole design

Bloc 1

Bloc 2

Bloc 3

X

Conductor length needed

With a straight length of 500 mm

Block 1: 69 m

Block 2: 105 m

Block 3: 142 m

Only block 3 needs « flare dance » end.

Or 1260 m of 12 mm wide ribbons needed

(or 202 k$)

We may be able to discuss this number!

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

10


Dipole design4

Y

Dipole design

Bloc 1

Bloc 2

Bloc 3

X

Junctions

Main conductor: SC face to face

Mid point and end connections: SC back to back

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

11


Task 4 hts material characterization dipole insert conceptual design

Thank you for your attention

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

12


Task 4 hts material characterization dipole insert conceptual design

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Task 4 hts material characterization dipole insert conceptual design

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Which hts will fit

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

Which HTS will fit?

Bi2212

YBCO

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Bi 2212

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

Bi 2212

Assume we can make a Rutherford cable using a round wire with 25% SC material

Ic @ 4.2K & 20T = 82A

Winding with 20% insulation

No cabling degradation

Good head treatment

Je = 130 A/mm²

We may expect B = 2.72T

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Task 4 hts material characterization dipole insert conceptual design

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

YBCO

Measured values

Using AMSC 344 Cu (made for magnets)

4.55 x 0.22 = 1 mm²

Ic @ 4.2K & 10T = 325A

Ic @ 4.2K & 15T = 245A

Extrapolation : Ic @ 4.2K & 20T = 165A

Winding with 20% insulation

No winding degradation

Je = 130 A/mm²

We may expect B = 2.72T

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

17


Task 4 hts material characterization dipole insert conceptual design

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

YBCO

Measured value

Using AMSC 344 S (with stainless steel, not made for magnets)

1.41 mm²

Ic @ 4.2K & 15T = 580A

Extrapolation : Ic @ 4.2K & 20T = 500A

Winding with 20% insulation

No winding degradation

Je = 285 A/mm²

We may expect B = 5.96T

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

18


Task 4 hts material characterization dipole insert conceptual design

YBCO

Using Super Power SCS 4050i (with kapton insulation)

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

19

19


Ybco ribbon characterization

YBCO ribbon characterization

Results (with 0.1 µV/cm criterion) :

Je = 275 A/mm² @ 20K & 13T

We may reach what we need !

(287 A/mm² @ 4.2K & 18T)

Worrying concern: this tape blew up after 8 critical current measurement under 15T at 4.2K and 30K

16 mars 2010

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

20


Ybco ribbon characterization1

YBCO ribbon characterization

Test “as purchased”

  • Test after “damaging quench”

16 mars 2010

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

21


Ybco ribbon characterization2

YBCO ribbon characterization

  • Some measurements problems :

     To much heat power generated in the sample-current leads junctions : Uneasy to regulate the température.

     The problem is corrected but we haven’t done the tests again yet.

  • It’s very difficult to limit the heat generation next to the sample when high current (> 500A) flows through the sample over long period of time (> 20s).

    A new measurement setup is needed for high current under low field

16 mars 2010

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

22


A rough mechanical approach forces

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

A rough mechanical approach - Forces

50 tonnes

1040 tonnes

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


A rough mechanical approach stresses

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

A rough mechanical approach - Stresses

Stress 270 MPa

20 mm

Interbloc

Stress 9 MPa

Mid plane

Stress 17 MPa

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Structure why should we keep the insert in a circular bore

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

StructureWhy should we keep the insert in a circular bore?

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

25


Winding

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

Winding

How to use ribons for the mid plane pancake ?

Can we assemble ribbons to increase Ic ?

Can we mix Bi2212 and YBCO in the same insert ?

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

26


Winding1

Winding

Winding developments can be inspired from the INNOVAC project (Danish Technical Institute/Danfysik/ Siemens)

From an IOP presentation by Nikolaj Zangenberg, Danish Technological Institute

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010


Protection

Bloc 1

Bloc 2

Bloc 3

Bloc 4

X

Protection

Can we allow HTS to quench ?

HTS material degradation often observed after quench

Where could we have copper ?

The need of high current density does not leave place for stabilizer

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

28


Task 4 hts material characterization dipole insert conceptual design

It may be wise to add a contribution of the HTS fringe field on the Nb3Sn winding.

A sub task with T3 and T4 people for the interface definition is strongly needed !

- J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

29


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