CERN/CEA Collaboration agreement No. KE2275/TE

WP4 – Nb3Sn technology development

Pré-Kick-off meeting 03/07/2014

Nb3Sn Technology development

• WP4 concerns the studies necessary on Nb3Sn cable prior to new coil winding.

• It is centered on FRESCA 2 cable but other cases as QXF or 11T cables could be analyzed.• FRESCA 2 Cable characterization• Mechanical tests facility at Saclay• Cable behavior during heat treatment

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• Cable expansion studies• Insulated cable procured by CERN• Ten stacks preparation and heat treatment at Saclay• Dimensional measurements under 5MPa at CERN

FRESCA 2 cable characterization

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RRP Cable

SRNNN02 H110C0115AA RRP RUN 76A no 1.834 mm

SRNTN02 H110C0115AA RRP RUN 76A yes - 26.5% 1.873 mm 2.97%

SRNTN03 H110C0115AA RRP RUN 76A yes - 26.5% 1.872 mm 2.86%

SRNTN04 H110C0115AA RRP RUN 76A yes - 4% 1.877 mm 3.13%

PIT Cable

SPNNN02 H11EC0116AB PIT RUN 77A no 1.831 mm

SPNTN02 H11EC0116AB PIT RUN 77A yes - 26.5% 1.889 mm 3.79%

SPNTN03 H11EC0116AB PIT RUN 77A yes - 26.5% 1.883 mm 3.46%

SPNTN04 H11EC0116AB PIT RUN 77A yes - 4%

TEN STACK REF

HEAT TREATMENT - CAVITY

Thickness increase / 1.82

CABLE REFERENCEThickness @5MPa

TEN STACK REF

CABLE REFERENCEHEAT TREATMENT -

CAVITYThickness @5MPa

Thickness increase / 1.82

• Impregnated cable mechanical behavior studies• Insulated cable procured by CERN• Ten stacks heat treatment and impregnation at Saclay• Compressions tests at RT• Compressions tests at 4K• Thermal contraction measurement between RT and 77K/4K at Saclay

FRESCA 2 cable characterization

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140 mm

Impregnation insert and mold

Mechanical tests facility at Saclay• Mechanical tests facilities at Saclay 03

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5Compression tests set-up Thermal contraction set-up

Cable behavior during HT• Short coil dilatation tool

• Mandrel total length: 690 mm• Straight section total length: 600 mm• Mandrel width: 90 mm• 1.5 turns = 2.4 m of cable

• Mandrel configurations

• Configuration 0 – C0

• Configuration 1 – C1

• Configuration 2 – C2

• Configuration 1 sym – C1 LE

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Cable behavior during HT

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CLOSED MANDREL

MANDREL WITH CENTRAL GAP

Stress witness

Cable behavior during HT• PIT Cable

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Cable Mandrel material

C1Gap reduction

% LSS

C2 (*C1 LE)Gap reduction

% LSS1 central gap 2 head gaps *1

PIT 1.82 mm

Iron HT1 5.83 mm 0.97% HT2 5.22 mm 0.87%

Stainless steel HT2 6.73 mm 1.12% HT3 8.02 mm 1.34%

Titanium HT2 5.50 mm 0.92% HT3 7.94 mm 1.32%

PIT1.86 mm

Iron HT7 (3 turns) 5.16 mm 0.86% HT4 7.69 mm 1.28%

Titanium

HT7 4.96 mm 0.83% HT4 8.82 mm 1.47%

HT9 5.84 mm 0.97% *HT8 *7.86 mm 1.31%

HT9 Step 190°C 2.88 mm 49% of the final gap

HT9 Step 400°C 4.64 mm 79% of the final gap

Cable behavior during HT• RRP Cable

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Mandrel material

C1Gap reduction

L SS = 600 mm

L TOT = 690 mm

L cable = 741.4 mm

1 central gap % L SS % L TOT (head to head) % L cable

Titanium

HT5Central gap 4.73 mm 0.79% 0.69% 0.64%

Total gap (central - lateral) 3.93 mm 0.66% 0.57% 0.53%

HT6Central gap 4.55 mm 0.76% 0.66% 0.61%

Total gap (central - lateral) 3.84 mm 0.64% 0.56% 0.52%

HT10Central gap 4.89 mm 0.82% 0.71% 0.66%

Total gap (central - lateral) 3.97 mm 0.66% 0.58% 0.54%

Cable behavior during HT – next steps• Complete RRP and PIT FRESCA2 cable tests campaign with reduced

scale dilatation tool studying the influence of : • SS length • Number or turns• Cable insulation

• Scale-1 Dilatation test

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