General remarks

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• General remarks
• UT participation provided all expenses are fully
  covered.
• UT/EU-FP7 RTD/JRA funding scheme
• - Personnel 0.75 x (real costs hourly
  overhead) - Material/travel 0.75 x
  eligible costs
• WPs mostly technological, no scientific issues
  defined (looks like LARP magnet program)

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UT role for conductor RD (Nb3Sn, BSCCO, YBCO)
(WP(2), 3, 4 and 5) - 5 vacuum ovens for wire
HT 1.5 meter long straight cable samples
(FRESCA) - impregnation facilities (small coils,
1.5 meter FRESCA samples) - wire
characteristics Ic(B,T,e) (2000 A, 15 T, 4-30
K, /- 1) (s,e) curves 300,77,4.2 K (virgin,
HT strands) M (meters long wire samples, /-
6T, 10-240 mT/s) NZP and MQE measurements
(1200 A, 15 T, 4-30 K)) - cable
characteristics calorimetric AC loss (Ra/Rc)
measurements (/- 300 mT, up
to 250 mHz, 60 MPa) direct measurement of
Ra/Rc involved in stability measurements at
FRESCA
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• (deviatoric) strain sensitivity of Ic(Bc2(e),
  Tc(e)) of superconductor
• Fundamental level
• why and why so differently for different kind
  of conductors what happens to the BCS energy
  gap why does the phonon spectrum changes like
  it does
• Wire level
• how does dev. e depend on wire
  geometry/composite constituents how and why
  affects filament geometry dev. eCable/coil
  level
• how do strands respond to cabling (proceed with
  Stefanias work)
• dev. strain in 3D cable model (cool-down,
  transverse pressure) (IS RESIN IMPREGNATION
  MANDATORY, (cooling issues) ?????) include
  non-linear (s,e) behavior in mechanical analysis
  (not only stress (basic operational limits)
  but also cable location is very important
  (accelerator field quality)) what is the 3D
  dev. strain state during coil manuf. operation
  (stability !!!!!)

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a1/a21
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a1/a21
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Devices for Jc(H,T,e) studies
Pacman
U-spring

• Fully reversible -1 lt e lt 1
• Accurate at 1 mV/m level

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Devices strand characterisation (ITER)
Crossing strands for various wavelengths.
Strand tensile stress-strain tests at various T
(participation in VAMAS).
Bending between contact points for various
wavelengths.
Ic vs stress for crossing strands at 11 T and 12
T.
Stress-strain curve for LMI BM3 (TFMC) strand
Reduced Ic vs force for SMI strand with release
of load.
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Devices strand characterisation 2
Wide T, e-rangeU-spring
Point Contact Spectroscopy on U-spring
Physical Properties Measuring System

• (H,T,eii)
• Jc (H,T,eii)

D (H,eii)
Mh (H,T) Cv (H,T)
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stress sensitivity
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Magnet cooling
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Magnet cooling (2)

• Investigate (part of EU-NED)
• perforated insulation at minor edges
• radial transport in coils of He II
• heat transfer at such surfaces

He II channels