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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 3
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 4
NbNb33Sn Strand SpecificationSn Strand SpecificationRRP-54/61RRP-54/61
Spec. No.: LARP-MAG-M-8001-RevB
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 5
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 6
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 7
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 8
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 9
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 10
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 11
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 ?
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 12
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 13
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 14
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 15
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 16
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)
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 17
Powder-in-Tube (NbTa)Powder-in-Tube (NbTa)33Sn (PIT)Sn (PIT)Shape Metal Innovation (SMI)Shape Metal Innovation (SMI)
J. Lindenhovious
B179
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 18
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 19
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 20
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)
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 21
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 22
Rolled StrandsRolled Strands
Def=14% Def=28%
RRP 54/61
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 23
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.”
Luc Oberli (CERN) WAMDO-06
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 24
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
Luc Oberli (CERN) WAMDO-06
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 25
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
A. Ghosh (LARP Collaboration Meeting, LBNL April-26,28-2006) 26
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)
Top Related