wbs 2.4.2 strand procurement

A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006)

Arup K. GhoshBNL

WBS 2.4.2 WBS 2.4.2 STRAND PROCUREMENTSTRAND PROCUREMENT

A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 2

OutlineOutline

•Present status of strand procurement

•Future strand for LARP

– Smaller Filament Deff

– PIT strand

•Tolerance of RRP conductors to cabling degradation– Filament Spacing– Rolled strand– Revisit strand specification


Procurement PlanProcurement PlanNov-05Nov-05

LARP1100 kg

FY06300 kg

FY07400 kg

FY08400 kg

85 kgFNAL

54/61- 90 kg3/31/06

54/61- 60 kg6/30/06

54/61- 60 kg10/31/06

CDP FY06

54/61-60 kg3/31/06

84/91-35 kg7/30/06

108/127- 35 kg7/30/06


NbNb33Sn Strand SpecificationSn Strand SpecificationRRP-54/61RRP-54/61

Spec. No.: LARP-MAG-M-8001-RevB


Procurement StatusProcurement Status3-30-063-30-06

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


Strand Purchase and Inventory as of 4-Strand Purchase and Inventory as of 4-20-0620-06

Order Date Ship DateAdjusted Ship Date

Quantity Completed PO Program Billets

4/1/2006 at LBNL 30 CDP 82202/28/2005 11/30/2005 at LBNL 70 6720228 CDP 8647, 86488/29/2005 3/31/2006 5/15/2006 30 21 6802116 CDP 8817

" " 7/15/2006 60 "190 CDP

11/7/2005 7/2/2006 3/30/2006 90 37.4 6803608 LARP 878116.1 881736.5 8857

1/20/2006 9/6/2006 9/6/2006 90 6804489 LARP2/23/2006 11/30/2006 10/25/2006 90 6805346 LARP

TBD TBD 30 TBD LARP300 LARP


RRP 54/61 –Piece LengthRRP 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


Procurement Plan For FY07 Procurement Plan For FY07 3-30-063-30-06

LARP1100 kg

FY06300 kg

FY07400 kg

FY08400 kg

30 kgTBD

RRP 54/61270 kg

130 kg


Projected InventoryProjected Inventory

CDP LARP MagnetStrand Req.

Inventory of strand

Oct-05 33 SR01 7 26Nov-05 70 96Dec-05 96Jan-06 96Feb-06 96Mar-06 90 TQC02 40 146Apr-06 LR01 27 119

May-06 30 LR01, TQC02-R 89 60Jun-06 TQS02 40 20Jul-06 60 80

Aug-06 80Sep-06 90 170Oct-06 170Nov-06 90 SRS02, LR02 88 172Dec-06 PCX01 40 132Jan-07 132Feb-07 90 LQX01 165 57Mar-07 57Apr-07 57

May-07 57Jun-07 90 147Jul-07 147

Aug-07 147Sep-07 90 237

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


Towards a more “flux-jump” stable Towards a more “flux-jump” stable conductorconductor

• Why ?– Intrinsic (Adiabatic) stability of wire– Field quality in magnets

• Reduce Effective Filament Diameter Deff

– Deff < 30 m (adiabatic limit not established experimentally for high Jc wire )

• For Deff > 35 m, maintain high RRR after reaction prevent Sn-leakage

• OST-RRP- 91 and 127 sun-element billet design – Cabling Effects

• Shearing of sub-elements RRR degradation

• SMI-PIT- 288– 50 m at 1.25 mm wire– 32 m at 0.8 mm wire


Decreasing the sub-element sizeDecreasing the sub-element size

• Pack increasing number of sub-elements into Re-stack– Increasing number of bundles packing more difficult– More cold work increases the hardness of non-Sn parts– Additional Cu-Cu surfaces worse bonding yield ?


91-127-217 series made with Nb-Ta for 91-127-217 series made with Nb-Ta for CDP R&DCDP R&D

• High Jc design (3000 A/mm2):

• Objective was to only vary the sub-element size– same sub element billet for all restacks– all restacks ~53% non-Cu, 0.7 mm strand

• Significant wire breakage for all, 217-stack the worst– For a reaction at 665 C/50hrs

(Jc, RRR)

• 91-stack 2920, 134

• 127-stack 2720, 110

• 217-stack 2660, 7 (Many broken barriers)

Suggests there is some size effect controlling the maximum Jc


Future RRP StrandFuture RRP Strand

• Is OST ready to produce 91 and 127 sub-element billets ?“Further to our discussions today about 61 127 stack

designs for LARP, this year we are producing 91-stack material for the EFDA dipole. The sub-element design is for lower Jc and uses Nb-Ti (Jc ~2400 @ 12 T), but the work will give us some yield data on our way to 127 stacks.”

Based on CDP R&D billet 8079 (90/91) and FNAL billet 8195 (108/127) both of which uses the same sub-elements of Nb/Nb-47Ti


EFDA Dipole Project

Due datesDelivery One (30 kg strand): delivered Delivery Two (120 kg strand): 9 months Delivery Three (280 kg strand): 15 months

E. Salpietro

Strand based on 90/91-stack design using Nb/ Nb-47Ti rods


Future RRP StrandFuture RRP Strand

• Is OST ready to produce 91 and 127 sub-element billets ?

• 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 108/127 billet is being processed (Nov-06)

• FNAL has OST fabricating a R&D billet using 120/127 design (Dec-06)


Powder-in-Tube (NbTa)Powder-in-Tube (NbTa)33Sn (PIT)Sn (PIT)Shape Metal Innovation (SMI)Shape Metal Innovation (SMI)

J. Lindenhovious

B179


PIT -StrandPIT -Strand

• NED is pushing SMI-VAC to develop strand.

• Latest billet B207 is 288 filament, similar to B179– Strand Diameter 1.25 mm– Cu/Non-Cu= 0.96– Jc > 2400 A/mm2 At 12 T

B179 B 207

Luc Oberli (CERN) WAMDO-06


SMI – 288 filamentSMI – 288 filament

Jc = 2077 A/mm2 at 12 T

Jc = 1118 A/mm2 at 15 T

HT = 84 hours at 675 0C

Jc non Cu lower than B179

by ~ 10 - 15 % due to powder preparation which underwent by mistake an additional HT.

• Stability measurements performed by LASA : Field rate ~ 15 mT/sAt 1591 A, no quench in the field range : 0 - 5 T

0

500

1000

1500

2000

2500

3000

3500

8 10 12 14 16 18 20

PIT-B207

Jc n

on-C

u [A

/mm

2]

Applied magnetic field [T]

LASA-Milan 4.24 K

UNI-Geneva 4.2 K

Luc Oberli (CERN)

WAMDO-06


SMI-PIT B-207 SMI-PIT B-207

0

200

400

600

800

1000

1200

1400

1600

0.0 2.0 4.0 6.0 8.0 10.0 12.0H (T)

Ic (

A)

Ic

Iq

PS. LIMIT

Wire drawn to 0.8 mm

Jc(12T) : 2145 A/mm2 , Js > 4500 A/mm2 (Is >1200A)

Filament size : 32 m (No flux-jump observed in magnetization)


Cabling DegradationCabling Degradation

• Strand Deformation at the cable edges– Filament

Distortion

• Simulate by rolling strands– E. Barzi (FNAL)– Filament

Merging

• Microscopy, Ic and Is measurements


Rolled StrandsRolled Strands

Def=14% Def=28%

RRP 54/61


SMI : Strand deformation by rollingSMI : Strand deformation by rolling

B 201B 179

Deformation of 25 %, i.e. d0 - t = 0.25 mm.

“Distribution of Cu within the strand important in order the strand can sustain heavy mechanical deformation as in cabling.”



SMI – Deformation by rolling on SMI – Deformation by rolling on B207B207

Ic Degradation of 15 – 17 % on samples with a deformation level of 28%RRR value dropped to 80 indicating Sn diffusion in the Cu matrix

Def = 28 %

Def = 28 %

after 84 h at 675 0C

With HT

2.8 at. % Sn

No HT



Re-visit Strand SpecificationRe-visit Strand Specification

Process Ternary RRP Nb3SnRe-Stack Design 54/61Strand Diameter, mm 0.7 ± .003

Jc(12 T) at 4.2 K, A/mm2 ≥ 2400Deff, µm (based on billet design) < 70Inter-Sub-element spacing, m 5IS, A > 1000 ACu-fraction, % 47 ± 2RRR (after full reaction) ≥ 100Twist Pitch, mm 14 ± 2Twist Direction right-hand screwMinimum Piece length, m 350High temperature HT duration, h ≥ 48


SummarySummary

• There is sufficient RRP 54/61 strand for the magnets in the near term

• 91-filament is moving into production

• 127 filament can be in production within 12 months.

• PIT strand with 288 filaments is “flux-jump” stable at 0.8 mm wire diameter with Jc ~ 2100 A/mm2 at 12 T

• Cabling Degradation from filament shearing– Optimization of cabling parameters– Optimization of strand design

• Increase filament spacing ? (FNAL has already ordered a 60/61 billet with larger Cu-spacing, evaluation in progress)

wbs 2.4.2 strand procurement

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