Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

1

LARP Strand: Status of 108/127 : Past and Present

Manufacture and Performance

BNL -FNAL - LBNL - SLAC

HiLumi-LHC/LARP Conductor and Cable Internal Review

Oct 16-17, 2013By Video

Arup K. Ghosh (BNL)

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

2

Outline

1. Introduction2. Production History of 108/127 strand3. Performance of 108/127

a. Ta-Ternary b. Ti-Ternary

4. Summary - Lessons Learned

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

3

Introduction 108/127, 0.7 mm RRP® wire from Oxford

Superconducting Technology first delivery of 90 kg in Feb-2008 under CDP contract Used in TQS03 – a very successful 90 mm magnet

2009-2012 substantial wire produced at 0.7 mm for LQ and 0.8 (0.778 mm) for HQ Ta-Ternary : (Nb – 7.5 wt.% Ta)3Sn 1300 Kg produced for LARP

108/127 Ti-Ternary : CDP development 2009 First delivery of 3 billets at 0.8 mm (using CDP funds) in

Mar-2011 used for HQ-C18, C21 and a LHC coil Good piece length RRR in the range of 60-70 for HT of 665°C/50h

410 Kg of Ti-Ternary wire delivered Sep’12 through Jan’13 Introduced design change: 5% lower Sn content

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

4

0

10

20

30

40

50

60

70

80

90

100

> 550 m > 750 m > 1000 m > 3000 m > 5000 m

% o

f wire

> Le

ngth

, m

Ta-0.7mm

Ta-0.8mm

Ta-0.778mm

Ta-0.85mm

Ti-0.85 mm

OST production of 108/127 for LARP

Production in parallel with ITER wireNote: In this time frame the yield of 54/61 declined 10%

Ti-ternary piece-length better than Ta-Ternary

Km Kg Type/Dia % of wire > Length, m # Billets Billet> 550 m > 750 m > 1000 m > 3000 m > 5000 m Yield, Kg

78 264 Ta-0.7mm 96.7 90.8 85.3 38.7 13.1 9 3162 260 Ta-0.8mm 97.1 92.8 89.8 39.0 21.8 9 29

136 570 Ta-0.778mm 92.0 86.9 78.3 37.1 15.1 21 2741 206 Ta-0.85mm 95.0 83.9 77.5 22.4 12.3 8 2683 410 Ti-0.85 mm 97.6 95.2 87.9 65.6 26.9 12 34

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

5

• OST qualified wires using the following HT schedule• 210°C/48h + 400°C/48h + 665°C/50h

• Overall, a very large fraction of the billets surpassed the Jc minimum of 2650 A/mm2

• However, there was little manufacturing margin in meeting the RRR minimum of 60.

• To meet the specs. the HT temperature had to be lowered to 650 °C/48h or lower.

• For the LQ coils (0.7 mm) the reaction temperature was further reduced to 640 °C/48h so that the RRR of extracted strands could be above 60, and for HQ (0.778 mm), 650 °C/48h was used to maintain RRR > 100.

Performance Highlights of Ta-108/127

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

6Arup Ghosh 6

2000

2200

2400

2600

2800

3000

3200

RRP-

1042

8 BE

RRP-

1042

9 BE

RRP-

1043

3 BE

RRP-

1200

8 BE

RRP-

1231

9 BE

RRP-

1239

1-3

BERR

P-12

520

BERR

P-12

878-

1 BE

RRP-

1287

8-2

BERR

P-12

879

BERR

P-12

885

BERR

P-13

090

BERR

P-13

091

BERR

P-13

154

BERR

P-13

211

BERR

P-13

376

BERR

P-13

377

BERR

P-13

596

BERR

P-13

618

BERR

P-13

658

BERR

P-13

659

BERR

P-13

699

BERR

P-13

700

BERR

P-13

709

BERR

P-13

710

BERR

P-13

711

BERR

P-13

916

BERR

P-13

917

BERR

P-13

918

BERR

P-13

965

BERR

P-13

980

BERR

P-14

007

BERR

P-14

070

BERR

P-14

144

BERR

P-14

205

BERR

P-14

206

BERR

P-14

243

BERR

P-14

244

BERR

P-14

394

BERR

P-14

395

BERR

P-14

396

BERR

P-14

397

BE

J c(12

T) A

/mm

2

Jc(12T)Jc-Specs >2650 A/mm2Average = 2865 A/mm2

OST data 0.8/0.778 mm 108/127 strand 210C/48h + 400C/48h + 665C/50h

Aug-23, 2012

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

7Arup Ghosh 7

OST data 0.8/0.778 mm 108/127 strand 210C/48h + 400C/48h + 665C/50h

Aug-23, 2012

0

50

100

150

200

250

RRP-

1042

8 BE

RRP-

1042

9 BE

RRP-

1043

3 BE

RRP-

1200

8 BE

RRP-

1231

9 BE

RRP-

1239

1-3

BERR

P-12

520

BERR

P-12

878-

1 BE

RRP-

1287

8-2

BERR

P-12

879

BERR

P-12

885

BERR

P-13

090

BERR

P-13

091

BERR

P-13

154

BERR

P-13

211

BERR

P-13

376

BERR

P-13

377

BERR

P-13

596

BERR

P-13

618

BERR

P-13

658

BERR

P-13

659

BERR

P-13

699

BERR

P-13

700

BERR

P-13

709

BERR

P-13

710

BERR

P-13

711

BERR

P-13

916

BERR

P-13

917

BERR

P-13

918

BERR

P-13

965

BERR

P-13

980

BERR

P-14

007

BERR

P-14

070

BERR

P-14

144

BERR

P-14

205

BERR

P-14

206

BERR

P-14

243

BERR

P-14

244

BERR

P-14

394

BERR

P-14

395

BERR

P-14

396

BERR

P-14

397

BE

RRR

RRR-Specs > 60

Average = 101

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

8Arup Ghosh 8

OST data 0.8/0.778 mm 108/127 strand Non-Cu %

Aug-23, 2012

0.35

0.37

0.39

0.41

0.43

0.45

0.47

0.49

0.51

0.53

0.55

RRP-

1042

8 BE

RRP-

1042

9 BE

RRP-

1043

3 BE

RRP-

1200

8 BE

RRP-

1231

9 BE

RRP-

1239

1-3

BERR

P-12

520

BERR

P-12

878-

1 BE

RRP-

1287

8-2

BERR

P-12

879

BERR

P-12

885

BERR

P-13

090

BERR

P-13

091

BERR

P-13

154

BERR

P-13

211

BERR

P-13

376

BERR

P-13

377

BERR

P-13

596

BERR

P-13

618

BERR

P-13

658

BERR

P-13

659

BERR

P-13

699

BERR

P-13

700

BERR

P-13

709

BERR

P-13

710

BERR

P-13

711

BERR

P-13

916

BERR

P-13

917

BERR

P-13

918

BERR

P-13

965

BERR

P-13

980

BERR

P-14

007

BERR

P-14

070

BERR

P-14

144

BERR

P-14

205

BERR

P-14

206

BERR

P-14

243

BERR

P-14

244

BERR

P-14

394

BERR

P-14

395

BERR

P-14

396

BERR

P-14

397

BE

Non-

Cu %

NC%NC% -LSLNC%- USLAverage

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

9

OST Ti-Ternary Strand Production

• 410 Kg from 12 billets have been delivered• 6 billets use standard Tin content• 6 billets use 5%-Reduced Tin content• Reduced Tin has significant impact on the RRR of the copper.

• Marginal decrease in Jc.• Lower reaction temperatures needed for Ti-ternary than Ta-

ternary wires for equivalent Jc 650°C instead of 665°C• Piece lengths have been very good; some billets drew down in

a single piece.For the standard Tin billets, we examined 640°C/48h to raise

the RRRFor the Reduced Tin billets, 665°C/48hr was explored to further

optimize Jc

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

10

OST data For Ti-Ternary at 0.778 mm

Reduced- Sn

210C/48h + 400C/48h + 650C/50h

2400

2600

2800

3000

3200Jc

(12T

), A/

mm

2

< Jc >reduced by ~ 3% for the “Reduced-Sn” billets

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

11

OST data For Ti-Ternary at 0.778 mm

0

50

100

150

200

250

300

350

RRR

210C/48h + 400C/48h + 650C/50h

Reduced- Sn

5% reduction in Sn content has strong influence on RRR

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

12

OST data For Ti-Ternary at 0.778 mm

Reduced- Sn

0.50

0.52

0.54

0.56

0.58

0.60Cu

%

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

13

OST Ti-Ternary Strand Production

• 410 Kg from 12 billets have been delivered• 6 billets use standard Tin content• 6 billets use 5%-Reduced Tin content• Reduced Tin has significant impact on the RRR of the copper.

• Marginal decrease in Jc.• Lower reaction temperatures needed for Ti-ternary than Ta-

ternary wires for equivalent Jc 650°C instead of 665°C• Piece lengths have been very good; some billets drew down in

a single piece.For the standard Tin billets, we examined 640°C/48h to raise

the RRRFor the Reduced Tin billets, 665°C/48hr was explored to further

optimize Jc

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

14

Jc (12T) and RRR for 0.778 mm wire

0

50

100

150

200

250

300

350

RRR

665C/48h

640C/48h

2650

2750

2850

2950

3050

3150

Jc (1

2T),

A/m

m2

665C/48h

640C/48h

Reduced-Sn

0.85

mm

0.85

mm

For the normal-Sn content billets we will use 640°C/48h reaction to raise RRR

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

15

Summary – Lessons Learned

• 108/127 strand procurement from three different labs and evolving specification from LQ to HQ to QXF has made it hard to adequately oversee the various contracts and its production. 108/127 took a long time to be a stable product.

• RRP wire can meet Ic spec with adequate margin• The “reduced-Sn” design change without making any other

change in the processing has yielded high dividend in RRR control and should be implemented for all billets going forward.

• Increased barrier thickness with “normal-Sn” content is another design change that is being developed for RRR control. I would approach this with caution pending sufficient experience. This design change may help in mitigating sub-element shearing during cabling.

• Recommend dedicated RRR check of wire as they are delivered. Substantially lower cost compared to Ic test.

Conductor Review Oct 16-17, 2013

LARP Strand :Specs. Procurement, Measurement- A. Ghosh

16

End of Presentation