Upload
audrey-washington
View
217
Download
1
Embed Size (px)
DESCRIPTION
Conductor Review Oct 16-17, 2013LARP Strand :Specs. Procurement, Measurement- A. Ghosh3 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 Nb 3 Sn (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.
Citation preview
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
wire smaller filament diameter: increase stability, lower
magnetization
Strand Design 54/61 84/91 108/127 132/169 192/217
# of Sub-elementsD w , mm 54 84 108 132 192
0.9 83 66 58 53 440.85 78 63 55 50 41
0.778 71 57 50 46 380.7 64 52 45 41 34
HQ02 strand at 0.778 mm is 108/127
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
10
Month
LARP Strand
Delivery kg
Cabling Run and End Use /
[Coil ID]Coil Winding
Start Date
Strand Req. kg
Cable Unit
Lengths
Ta 108/127 0.85mm
kg
Ti-108/127
0.85 mm kg
Ti-108/127 0.85 mm CDP kg
Ti-144/169 0.85
mm kg
Ti-144/169 0.85 mm CDP kg
Oct-13 SQXF- PC01 39 1 124 350Nov-13 SQXF- PC02 Practice winding test 39 1 124 310Dec-13 SQXF-03 39 1 124 271
Jan-14 SQXF-04,05 79 2 124 192Feb-14 SQXF-06, 07 SQXF- PC01 79 2 124 114Mar-14 90 SQXF-08 SQXF- PC02 39 1 124 75 90Apr-14 SQXF-C09 SQXF- C03 39 1 124 165 90 51May-14 165 165 396 180Jun-14 SQXF- C04 165 396Jul-14 SQXF- C05 165 486 90
Aug-14 LQXF-PC01 SQXF- C06 104 1 61 486Sep-14 LQXF-C01 SQXF- C07 104 1 61 382
Oct-14 SQXF- C08 61 382Nov-14 SQXF-C10 39 1 61 343Dec-14 SQXF-C11 LQXF-PC01 39 1 61 303Jan-15 SQXF-C12 LQXF-C01 39 1 61 264Feb-15 SQXF-C13 SQXF-09 39 1 61 225Mar-15 SQXF-10 61 225Apr-15 LQXF-C02 104 1 61 121May-15 LQXF-C03 SQXF-11 104 1 61 267 250
Strand Procurement and Cabling Plan
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
11
Apr-15 LQXF-C02 104 1 61 121May-15 LQXF-C03 SQXF-11 104 1 61 267 250Jun-15 LQXF-C04 SQXF-12 104 1 61 163Jul-15 200 LQXF-C05 SQXF-13 104 1 61 259
Aug-15 LQXF-C06 LQXF-C02 104 1 61 155Sep-15 200 LQXF-C03 61 355Oct-15 150 LQXF-C04 61 505Nov-15 LQXF-C05 505Dec-15 LQXF-C07 LQXF-C06 104 1 401Jan-16 LQXF-C08 104 1 297Feb-16 LQXF-C09&C11 208 2 89Mar-16 200 LQXF-C10&C12 104 2 185Apr-16 LQXF-C07 185May-16 150 LQXF-C08 335Jun-16 LQXF-C13&C15 LQXF-C09&C11 104 2 231Jul-16 LQXF-C14&C16 LQXF-C10&C12 104 2 127
Aug-16 LQXF-C17 104 1 23Sep-16 LQXF-C13&C15 23Oct-16 LQXF-C14&C16Nov-16 LQXF-C17
Conductor Review Oct 16-17, 2013
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
• windability, sub-element damage, cabling degradation
• HT optimization using 640 °C/48h, 650 °C/48h and 640 °C/96h.
• In Mar-Apr’14 we will use wire delivered under LARP contract which uses “reduced-Sn” to do a similar evaluation.
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
14
Summary
• Strand specification based on minimum Ic, Cu fraction, RRR and piece-length and a specific strand design
• Plan shown implements 169-strand in SQXF02 magnet and all LQXF.
• Strand procurement has been planned to meet coil winding schedule.
• Cabling start precedes coil winding by ~ 4 months• Specification and production QA plan to be formalized prior to
placing contract in FY’15
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
15
End of Presentation
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
16
Risk Mitigation for strand
• For LARP QXF magnet• Strand quantities outlined is just sufficient for the 17 coils of
LQXF• Loss of UL during cabling assumed to be zero. Typically this
happens if there is a strand cross-over in the cable. This is low risk as cabling at LBNL has not experienced such an event.
• Plan to have an option in the 350 Kg lot order for extra 200 Kg of wire sufficient for 2 Unit Lengths of LQXF ?
Conductor Review Oct 16-17, 2013
LARP Strand :Specs. Procurement, Measurement- A. Ghosh
17Nov 8-10, 2010 CM15 @SLAC
Arup Ghosh17
Conductor Qualification -1• Billet Qualification
– Rely on OST data– Meets minimum performance specification– OST data will be cross-checked with measurements of at least
one sample per billet• Cable Qualification
– This is important and needs to be completed prior to coil winding.
– Mechanical tests, metallographic test, insulation thickness – Electrical test: minimum 3 extracted strand and one round wire
– Heat Treatment schedule (HT) as specified for coil reaction• Coil HT Qualification
– Witness sample tests of extracted strands– Tests done at one measurement laboratory– Minimum of four extracted strand and one round wire