superconducting characterization of prototype lts samples · 2019-07-17 · superconducting...
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![Page 1: Superconducting characterization of prototype LTS samples · 2019-07-17 · Superconducting characterization of prototype LTS samples Mattia Ortino, ESR13 Atominstitut, TU Wien Vienna](https://reader034.vdocuments.us/reader034/viewer/2022042312/5eda7da52291b176b0237fc7/html5/thumbnails/1.jpg)
Superconducting characterization of
prototype LTS samples
Mattia Ortino, ESR13
Atominstitut, TU Wien
Vienna (AT)
EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H2020 Framework Programme under Grant Agreement no. 764879
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Mattia Ortino 2
ESR13 project
APC
No APC
ESR13 𝑁𝑏3𝑆𝑛
ESR13 𝑀𝑔𝐵2
Next steps
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3Mattia Ortino
New “clusters” design wires, Moscow (RU)
Project scope:ESR13 focuses on the superconducting and magnetic characterization of superconducting samples
suitable for FCC-hh or FCC-driven applications 𝑁𝑏3𝑆𝑛 𝑀𝑔𝐵2
Artificial pinning centres (APC) doped wires, Columbus (USA)
10T magnets (tapes) and FCC high current links (wires), Genova (IT)
ESR13 project
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4Mattia Ortino
ESR13 project
Project structure:
• Characterize the sample received from companies:
Tc measurements via AC susceptibility
Bc2 and Jc via resistive and magneticmeasurements
Local properties via Scanning Hall Probe Microscopy (SHPM)
• Collaborate with ESR12 (A.Moros, TU Wien), trying to relate these quantities with microstructural properties
• Find relations with the manufacturing process and discuss with the sample suppliers about the possible improvements to be done
(SQUID)
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Mattia Ortino 5
ESR13 project state of the art
APC
No APC
ESR13 𝑁𝑏3𝑆𝑛
ESR13 𝑀𝑔𝐵2
Next steps
![Page 6: Superconducting characterization of prototype LTS samples · 2019-07-17 · Superconducting characterization of prototype LTS samples Mattia Ortino, ESR13 Atominstitut, TU Wien Vienna](https://reader034.vdocuments.us/reader034/viewer/2022042312/5eda7da52291b176b0237fc7/html5/thumbnails/6.jpg)
6Mattia Ortino
ESR13 Nb3Sn APC
Prerequisites:
• Nb3Sn wires are the best candidates envisaged for building the FCC-hh 16T dipole-magnets (cheaper than
HTS)
• FCC-target performances (Jc = 1.5 kA/mm2 at Bappl=16T and T=4.2 K) not yet reached with state-of-art
commercial wires
Inter-granular ZrO2
particles
Intra-granular ZrO2
particles
Technology (“Internal oxidation method”):
• Oxygen selectively oxidizes Zr instead of Nb• ZrO2 nanoparticles to be used as additional pinning centres (intra and
inter-granular)• Nanoparticles should catalyse as well the A-15 grain size refinement, so
that increasing Jc (Jc = 𝑓(1/𝑑𝑔𝑟𝑎𝑖𝑛) )
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0 20 40 60 80 100 120
x (μm)
50
10
0
1
50
y (μ
m)
Mattia Ortino 7
Milestones
Characterization of prototype binary(ZrO2 nanoparticles in A-15 phase) APC wires
Higher Jc values than commercial
wires
Grain size refinement
Low Bc2
Local inhomogeneities
Shifted 𝐹𝑝/ 𝐹𝑝 𝑚𝑎𝑥peaks
36%
50%
80%
ESR13 Nb3Sn APC
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Mattia Ortino 8
Characterization of prototype ternary (ZrO2
nanoparticles + Ta in A-15 phase) APC wires
o Samples-slices prepared down to polishing limits (40 to 10 μm)
o Magnetization measurements: Tcand hysterisis loops
Offset (100%)90%
50%
10%
0%
o SHPM Possible to perform Tc-radial analysis
(radial inhomogeneitiesinvestigation)
ESR13 Nb3Sn APC
![Page 9: Superconducting characterization of prototype LTS samples · 2019-07-17 · Superconducting characterization of prototype LTS samples Mattia Ortino, ESR13 Atominstitut, TU Wien Vienna](https://reader034.vdocuments.us/reader034/viewer/2022042312/5eda7da52291b176b0237fc7/html5/thumbnails/9.jpg)
Mattia Ortino 9
ESR13 project state of the art
APC
No APC
ESR13 𝑁𝑏3𝑆𝑛
ESR13 𝑀𝑔𝐵2
Next steps
![Page 10: Superconducting characterization of prototype LTS samples · 2019-07-17 · Superconducting characterization of prototype LTS samples Mattia Ortino, ESR13 Atominstitut, TU Wien Vienna](https://reader034.vdocuments.us/reader034/viewer/2022042312/5eda7da52291b176b0237fc7/html5/thumbnails/10.jpg)
Mattia Ortino 10
ESR13 𝑁𝑏3𝑆𝑛 no- APC
• 8 samples reiceved
• Milestones:
1. AC magnetometry - in the range of temperature from 5 to 19 K;
Magnetic moment of wire sample as a function of temperature - M(T) curve for assessing Tc
distribution.
2. Scanning Hall Probe Microscopy (SHPM) - in the range of temperature from 5 to 19 K;
Magnetization maps of individual sub-elements and clusters, Tc distribution within sub-
elements and clusters and its variation between central and peripheral sub-elements
Wire identification 9a-4-17 16-1-17 11-3-17 11-10-17 11-2-17
Wire dia, mm 0.7 0.7 0.7 1 0.7; 0.36
Barrier Common
Ta
Common
Nb+Ta
Distributed
Nb
Distributed
Nb
Distributed
Nb+Ta
Subelement number 31 31 37 37 37
Subelement size, μm - - 80 120 80; 40
T1 T6T7 T8 T5T4 T3T2
Cu
Sub-element
T4 CuSub-element
with “clusters”
T3
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Mattia Ortino 11
ESR13 𝑁𝑏3𝑆𝑛 no- APC: „clusters“ sample
AC Magnetometry SHPM : Meissner-state measurements
SHPM : Remnant field-state measurements
Remnant field scans used for local current evaluation
In line with the state-of-art RRP wires (@ 10K, 0 T)
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27/06/2019 Mattia Ortino 12
ESR13 𝑁𝑏3𝑆𝑛 no- APC: sample without clusters
Line scans reveal an inter-subelements coupling
Sample without clusters (T4-distributed Nb)
SHPM : Meissner and remnant-field scans on other samples
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Mattia Ortino 13
ESR13 project state of the art
APC
No APC
ESR13 𝑁𝑏3𝑆𝑛
ESR13 𝑀𝑔𝐵2
Next steps
![Page 14: Superconducting characterization of prototype LTS samples · 2019-07-17 · Superconducting characterization of prototype LTS samples Mattia Ortino, ESR13 Atominstitut, TU Wien Vienna](https://reader034.vdocuments.us/reader034/viewer/2022042312/5eda7da52291b176b0237fc7/html5/thumbnails/14.jpg)
Mattia Ortino 14
ESR13 𝑀𝑔𝐵2
• 4 samples reiceved
• Milestones:
1. Magnetometry (SQUID)-
• In the range of temperature from 5 to 39 K; Magnetic moment of wire sample as a function
of temperature - M(T) curve for assessing Tc distribution.
• Hysteresis loops (Jc) and Bc2 (SQUID)
2. Scanning Hall Probe Microscopy (SHPM) –
• In the range of temperature from 5 to 39 K; Magnetization maps of
individual sub-elements,
• Tc distribution within sub-elements (if possible)
• Jc from Biot-Savart law inversion
Material Area (mm2) %
MgB2 0.26 12
Ni 1.39 63Iron 0.22 10
Copper 0.33 15Total 2.20 100
Dimension 3.67 x 0.65
1 wire
3 tapes
+ MgB2 powder
Together with ESR7 (M.Donato, ASG
Superconductors)
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Mattia Ortino 15
ESR13 𝑀𝑔𝐵2
Sample preparation
AC Magnetometry
Jc from Hysteresis Loops
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Mattia Ortino 16
ESR13 𝑀𝑔𝐵2
SHPM : Remnant field-state measurements
Remnant field profile of single sub-element10K, 2T applied
Only one tape analysed so far
On thin slices (<80 μm) reliable Jcextrapolation from Biot-Savart inversion
(results comparable with those fromresistive measurements)
High magnetic background (Nichel)
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Mattia Ortino 17
ESR13 project state of the art
APC
No APC
ESR13 𝑁𝑏3𝑆𝑛
ESR13 𝑀𝑔𝐵2
Next steps
![Page 18: Superconducting characterization of prototype LTS samples · 2019-07-17 · Superconducting characterization of prototype LTS samples Mattia Ortino, ESR13 Atominstitut, TU Wien Vienna](https://reader034.vdocuments.us/reader034/viewer/2022042312/5eda7da52291b176b0237fc7/html5/thumbnails/18.jpg)
Mattia Ortino 18
Next steps
𝑁𝑏3𝑆𝑛 APC
• Sample preparation getting more important: new thin slices required for SHPM
• Analyse local properties data (radial inhomogeneities, local currents) and relate them with microstructural ones
• Analyse magnetometry data for Jc and Bc2 evaluation
𝑁𝑏3𝑆𝑛 no APC
• Focus on samples with innovative layouts (T7 & T8) for local properties investigation
• Isolate sub-elements (Cu-etching) for individual magnetic measurements
• Relate results with microstructural ones (barriers width, elemental composition)
𝑀𝑔𝐵2• New samples (new powder composition, new doping) coming:
compare and understand performance differences from Jc and granulometry data
• Etching of Nichel/Monel from bulk samples in order to measure with less magnetic background
• Secondment in ASG Superconductors in October
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Mattia Ortino 19
Thanks for your attention!