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Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
1
LARP Strand: Specifications, Procurement and
Measurement Plans
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. QXF Magnet Strand
a. Specification3. QXF Strand Procurement Plan
a. Implementation of 169 designb. Details of Plan
4. Strand Evaluation5. Summary
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
3
Introduction For the QXF Magnets we use RRP® wire from
Oxford Superconducting Technology Strand diameter 0.85 mm
Whereas so far HQ has used Ta-Ternary strand, QXF will use Ti-Ternary Nb3Sn
(Nb- 1.5 at% Ti)3 -Sn Cable is a 40- strand Rutherford Cable with
stainless steel core Wire is currently based on the 108/127 design Specification for the strand is a “performance -
based specification” that satisfies the minimum requirements as set by the magnet design.
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
4
Ta-Ternary vs. Ti-Ternary 0.7 mm strand from CDP
350
400
450
500
550
600
650
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Sample loadedSample unloaded
Crit
ical
Cur
rent
, Ic (A
)
Applied Strain, (%)
Ec = 0.1 V/cm
T = 4 KB = 12 T
irr
~ 0.62 %
max
~ 0.37 %
A'B'C' G'H' I'J'
CDE F GH IJ
A B
D'E'F'
KL
MN
OP
Q
R
S
K'L'M'N'O'
P'
Q'
R'
S'
(b)
Ti-doped RRP Nb3Sn wire
irr,0
= 0.25 %
250
300
350
400
450
500
550
600
0 0.1 0.2 0.3 0.4 0.5 0.6
Sample loadedSample unloaded
Crit
ical
Cur
rent
, Ic (A
)
Applied Strain, (%)
Ec = 0.1 V/cm
T = 4 KB = 12 T
irr
~ 0.37 %max
~ 0.33 %
A' B'C'
G'
H'
I'
J'
CDE
F
G
H
I
J
A B
D'E'F'
(a)
Ta-doped RRP Nb3Sn wire
irr,0
= 0.04 %
350
400
450
500
550
600
650
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Sample loadedSample unloaded
Crit
ical
Cur
rent
, Ic (A
)
Applied Strain, (%)
Ec = 0.1 V/cm
T = 4 KB = 12 T
irr
~ 0.62 %
max
~ 0.37 %
A'B'C' G'H' I'J'
CDE F GH IJ
A B
D'E'F'
KL
MN
OP
Q
R
S
K'L'M'N'O'
P'
Q'
R'
S'
(b)
Ti-doped RRP Nb3Sn wire
irr,0
= 0.25 %
250
300
350
400
450
500
550
600
0 0.1 0.2 0.3 0.4 0.5 0.6
Sample loadedSample unloaded
Crit
ical
Cur
rent
, Ic (A
)
Applied Strain, (%)
Ec = 0.1 V/cm
T = 4 KB = 12 T
irr
~ 0.37 %max
~ 0.33 %
A' B'C'
G'
H'
I'
J'
CDE
F
G
H
I
J
A B
D'E'F'
(a)
Ta-doped RRP Nb3Sn wire
irr,0
= 0.04 %
Influence of Ta and Ti doping on the irreversible strain limit of ternary Nb3Sn superconducting wires made with restacked-rod process*N. Cheggour, L. F. Goodrich, T. C. Stauffer , J. D. Splett , and X.F. Lu, A. K. Ghosh, G. AmbrosioSupercond. Sci. and Tech., 20, (2010)
Ti-doped Nb3Sn wire more strain tolerant than Ta-dopedirr increases to 0.25 % from 0.04 %
This has been confirmed for 0.8 mm (Nb-1.5 at% Ti)3-Sn strand irr = 0.32-0.35 % as well as strands with 108 and192 filaments. Expect 169 design to be similar.
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
5
Present SpecificationLARP-MAG-M-8004 Rev. A
Strand Diameter, mm 0.85Jc(12 T) at 4.2 K, A/mm2 > 2650
Ic, A > 684Jc(15 T) at 4.2 K, A/mm2 > 1400
Ic, A > 381ds, µm (nominal)
< 60Cu-fraction, %
> 53 Cu/non-Cu
> 1.13RRR
> 150Piece length
> 750 m
ds sub-element diameterJc Critical Current DensityRRR residual resistivity ratio
108/127
Reduced-Sn content to
obtain high RRR
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
6
Implementing 169 design wire Motivation for adopting 132/169 (144/169) design
For QXF with 0.85 mm strand a similar filament diameter requires 132 filaments. Note: 108 to 132 is only 10% change in filament diameter
Cu/Non-Cu= 1.2
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
7
• For LARP QXF magnet• SQXF01 Magnet will use 108/127 strand• Presenting a plan to use 169-strand in SQXF02 and in
LQXF magnets• In FY14 with CDP funds, contracts were placed at OST for
• 180 kg of 144 or132 filament strand with “Reduced-Sn”• 90 kg of wire 169-design with 30% increased barrier
thickness and “normal-Sn” content. •LARP has an existing PO of 275 Kg for 108/127 meeting the specification shown previously
• Convert to 169- strand with “reduced-Sn”.•All future LARP contracts in FY15 for 169-strand
Implementing 169 design wire
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
8
Procurement Plan for QXF magnets Require 12 + (1 PC) coils for SQXF; unit length 170 m Require 17 + (1 PC) coils for LQXF; unit length 450 m Assuming 10% loss in strand from cable mapping Total length of strand for SQXF: ~ 470 Kg (94 km) Total length required for LQXF: ~ 1760 Kg (352 km) Present Inventory
350 Kg (Ti-Ternary 108/127 design) 200 Kg (Ta-ternary 108/127 design) Used for Practice coils
CDP (Conductor Development Program) will provide ~ 520 Kg 270 Kg 132/169 design May – July’14 250 Kg June’15
LARP procurement in FY’13 for 275 Kg (Ti-ternary 108/127) Convert to 169-strand ?
Additional orders to be placed in FY15: ~ 900 Kg, either as one lot or two lots of 550 and 350 Kg
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
9
Strand Procurement and Cabling Schedule
• For LARP QXF magnet• Procurement and Cabling schedule set by the
demands of coil fabrication• Cabling start is set 4 months before start of coil winding
• Typical time for cabling is 2 weeks • Braided Insulation at New England Wire
• 4 weeks• Strand procurement time is presently at 13 months
• Partial delivery can start as early as 9 months
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
12
Cost and Yield• In going from 54/61 to 108/127, the yield dropped by ~
14% and the average piece-length decreased. Cost premium ~ 14%.
• Based on recent quote from OST, 144/169 wire cost is ~ 14% higher for the same performance specification. OST expects yield to be less than 108/127. Note that for the 132-filament strand the cost would be slightly lower (less Nb) and fractionally higher expected yield. 144 filament strand will have higher Ic and lower Cu %.
• CERN procurement results can yield some insight in comparing 108/127 with 132/169.
• There is loss of Jc as one goes from 54 to 108 to 132 filaments and a higher probability of lower RRR as the number of filaments increases for the same wire diameter.
• “Reduced-Sn” will mitigate this.
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
13
LARP Near Term Measurement Plan• To fast-track the evaluation of the 169-strand, OST has
offered one billet of 132/169 with “normal-Sn” delivered in early Jan’14 under the CDP contract.
• Plan to use this delivery to make lengths of QXF cable for evaluation and comparison with 108/127 strand cable
• Mechanical tests, metallographic test, electrical test using extracted strands