LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 1

2.4 Magnet Material

A. Ghosh

E. Barzi

D. Dietderich

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 2

Materials Group

• E. Barzi 2.4.1.1 Strand R&D– Strand Characterization

• Ic, Is, RRR, M

• Heat-treatment optimization

• Extracted strand Test

• D. Dietderich 2.4.1.2 Cable R&D– Cable Fabrication

• Prototype Cable using new strand

• Production Cable for Magnets

– A. Ghosh 2.4.2 Conductor Procurement

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 3

Strand Procurement

HT Optimization Strand Qualification

Cable Fabrication

Cable Qualification

Coil Winding

Rolled Strands

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 4

Procurement Strategy

Have a plan for conductor that ensures that there is sufficient material in the pipeline from OST for all the magnets to be fabricated in FY06 and FY07.

Take advantage of the Conductor Development Program to advance the higher risk strand from being an R&D conductor to a “production” strand.

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 5

“Baseline Strand”

• Rod Re-Stack Process, RRP 54/61 Design

– 0.7mm diameter

– Filament diameter ~ 70 m

– Jc in the range of 2400-3000 A/mm2 at 12T

– RRR of stabilizer Cu > 100

– low field stability current Is

~ 1000 A and higher depending on reaction time/temperature

126/

127

126/

127

OST-RRP 54/61 design

-600

-400

-200

0

200

400

600

-4 -3 -2 -1 0 1 2 3 4 5 6

APPLIED FIELD [T]

MA

GN

ET

IZA

TIO

N [

kA

/m]

70 m

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 6

Billet Characterization-Strand Stability

0

200

400

600

800

1000

0 2 4 6 8 10 12 14

Field, T

Iq, A

VI 0.7 mm 54 fil RRP

VH down

VH up

IS

IS

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 7

RRP HT Studies

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 8

Prediction of Short Sample Limits

SRS01

0

400

800

1200

1600

8 9 10 11 12 13 14 15 16

Field, T

I c, A

Ave. Extracted 4.2 K BNL

Parameterization

Ave. Extracted 4.2 K FNAL

Parameterization

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 9

High Field Short Sample Limits

BNL: Imax = 9780 A (490 A/strand) Bpeak = 12.4 T

8000

8500

9000

9500

10000

10500

11000

11500

12000

11 12 13 14

Field, T

Cu

rre

nt,

A

BNL - Extr. 4.2 K

FNAL - Extr. 4.2 K

BNL - Extr. 4.5 K

FNAL - Extr. 4.5 K

Bpeak

FNAL: Imax = 9630 A (480 A/strand) Bpeak = 12.2 T

SRS01

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 10

Cable R&D

Cable TYPE

CABLE ID STRAND MAGNET

Cable Designation

Date / Manufacture

L7O B0933 RRP TQ Prototype 10/5/2005S3O B0935 RRP SRS01 Production 10/28/2005L7O B0936 RRP TQ Prototype 11/10/2005L7O B0939 RRP TQC02 Production 3/9/2006L7O B0940 RRP TQ Production 3/20/2006S3O B0941 LR Cu Practice 4/3/2006S3O B0942 LR LR01 Production 4/26/2006

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 11

Cabling DegradationMinor Edge of 939R & 940R

Two cables are in specification of thickness, width, and keystone angle

• Strand Deformation at the cable edges– Filament Distortion

• Simulate by rolling strands– Study effect of Filament Merging

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 12

Towards a more “flux-jump” stable conductor

• For the RRP strand

• Effective Filament Diameter Deff~ Sub-element Diameter

– Deff scales inversely with increasing number of Sub-elements

– Strand Stability increases with decreasing Deff

• Increasing number of filament– Increases difficulty of wire processing– Packing difficulty, increased cold work of non-Sn components– Bonding issues wire yield

Deff ~70m 60 m 50 m 40 m

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 13

Future RRP Strand

At present the lower Jc ( > 2000 A/mm2) 91-design billet is moving into production EFDA Order of 400 kg

Under CDP R&D this year, a high Jc 127-design billet is being processed (Nov-06)

Under FNAL core program a R&D billet using 120/127 design is being fabricated (Dec-06)

8079 7904

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 14

New R&D Design by OSTFNAL Core program

60/61 restack with spaced SE’s

Previous design New design (‘05)

The new design has increased Cu thickness between subelements to reduce cabling impact on subelement merging.

54/61 restack

Newer design (‘06)120/127

restack with spaced SE’s

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 15

Procurement Status3-30-06

LARP1100 kg

FY06300 kg

FY07400 kg

FY08400 kg

30 kgTBD

54/61- 90 kg3/31/06

54/61- 90 kg9/30/06

54/61- 90 kg10/25/06

CDP FY06

54/61-30 kg5/30/06

54/61- 60 kg7/30/06

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 16

Projected Inventory

0

50

100

150

200

250

Oct-05

Jan-06

Apr-06

Jul-06

Oct-06

Jan-07

Apr-07

Jul-07

Kg

54/61 wire

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 17

RRP 54/61 –Piece Length

0

1000

2000

3000

4000

5000

6000

7000

8000

1 2 3 4 5 6 7 8 9

No. of Pieces

Pie

ce L

engt

h, m

8220

8647

8648

8781

8817

8857

8879

•250 kg of wire produced for LARP and CDP in the last 12 months, single billet yield is ~ 35kg

•93 % in lengths >1Km, 57% in lengths >3 km

•With the following HT 665C/50 hrs

•Average Jc(12T)=2880 A/mm2

•Average RRR= 189

LARP Collaboration Mtg, LBNL 4/26-28, 2006

A. Ghosh 18

Summary

• Strand procurement of RRP 54/61 is proceeding on schedule.• There is sufficient conductor on hand for fabricating cable for

the magnets. • Round and extracted strand testing is well established to

qualify strand and cable• Test Data from the three labs are quite consistent• Heat treatment optimization studies used to improve strand

stability• Cabling Degradation from filament shearing

–Optimization of cabling parameters–Optimization of strand design– Rolled strand studies have been initiated for the new

generation RRP conductor.