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)

UT role for conductor R&D (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,) (2000 A, 15 T, 4-30 K, +/- 1%)+ () 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

0

0.2

0.4

0.6

0.8

1

1.2

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 ii (%)

Jc,

Jc,0

Nb3Sn

MgB2

YBaCuO

BSrCaCuO

Typical Jc,n- strain (ii) response for various superconductorsinduced by changes in Hc2 and Tc (and finally irreversible crack formation)

(deviatoric) strain sensitivity of Ic(Bc2(), Tc()) 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. depend on wire geometry/composite constituents+ how and why affects filament geometry dev.

Cable/coil level+ how do strands respond to cabling (proceed with Stefania’s 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 !!!!!)

a1/a2=1

Z

Infinite bronze matrix

Z

Infinite bronze matrix

a1/a2=1

B

- Fully reversible -1% < ε < 1 %

- Accurate at 1 V/m level

‘Pacman’ U-spring

0

50

100

150

200

250

300

350

-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

strain [%]

I c @

10

V

/m [A

]

data Pacman

Poly. (data Pacman)

Devices for Jc(H,T,) studies

Bending between contact points for various wavelengths.

SMI PIT

0.2

0.4

0.6

0.8

1

0 1000 2000 3000 4000 5000

load per meter [N/m]

I c/I

c0 [-

]

L=7.15 mm

Reduced Ic vs force for SMI strand with release of load.

Crossing strands for various wavelengths.

Ic vs stress for crossing strands at 11 T and 12 T.

LMI-TFMC

y = 1.129E-07x3 - 3.756E-05x2 - 4.788E-04x + 9.921E-01

y = 7.460E-08x3 - 3.276E-05x2 - 7.915E-04x + 1.211E+00

0

0.2

0.4

0.6

0.8

1

1.2

0 50 100 150

stress [MPa]

I c/I

c0 [-

]

X-strands, 12 T, Lw=4.67 mm

X-strands, 11 T, Lw=4.67 mm

Strand tensile stress-strain tests at various T (participation in VAMAS).

Stress-strain curve for LMI BM3 (TFMC) strand

Devices strand characterisation (ITER)

(H,T,ii)

Jc (H,T,ii)

(H,ii) Mh (H,T)

Cv (H,T)

Wide T, -rangeU-spring

Point Contact Spectroscopy on U-spring

Physical Properties Measuring System

Devices strand characterisation 2

Work package 2.56 23.7 19.5 31-dec-04

WP-HFM-1 Management and coordination

Follow -up of the progress in the technical WPsRegular reporting to EU and participants’ management (yearly report)PlanningFinancial follow up (quarterly report)

0.16 1.2 0 31-dec-04

WP-HFM-2 Support studies

1) radiation resistance of Nb3Sn certified2) radiation resistent insulation certified3) rediation resistent impregnation certified4)Heat deposition and heat removal model with experimental validation.5)Thermal coil design parameters for dipole and 0.8 12.5 7 31-dec-04

WP-HFM-3 High field dipole model

1.5 m long, 13T, 100 mm aperture model dipole magnet

0.9 4 6 31-dec-04

WP-HFM-4 Very High field dipole insert

1 solenoid insert for 100 mm bore1 dipole insert for 100 mm bore

0.4 4 4 31-mei-06

WP-HFM-5 Corrector model in Nb3Sn

short model of a single conductor wound Nb3Sn corrector

0.3 2 2.5 31-mei-06

WP-HFM-opt1High field long prototype

4 m long, 180 T/m, 130 mm aperture quadrupole magnet or4 m long, 13 T, 100 mm aperture dipole magnet

1.2 6 7 31-mei-06

WP-HFM-opt2Two-in-One high field dipole model

1 m long, 12 T bore field, 60 mm aperture two-in-one dipole model

0.7 4 5 31-mei-06

0.7

0.8

0.9

1

0 40 80 120 160 200

transMPa

Ic(

tran

s)/I

c(0)

cable 1

cable 2

cable 3

poorly impregnated cable

transverse pressure on cables

0.7

0.8

0.9

1

0 40 80 120 160 200

cable 1

cable 2

cable 3

poorly impregnated cable

reversible reduction irreversible

degradation

stress sensitivity

2000

2400

2800

3200

3600

4000

8.0 10.0 12.0 14.0

B, G/20 (T,T/m)

J (A

/mm

2 )

1.9 K4.3

5 K

6 K

9 K

8 7

100%

80%

0.01

0.10

1.00

10.00

100.00

1 10 100 1000

Qv (mW/cm3)

Tca

b-T

b (K

)

DT surface

DT insulation

DT total

q*=8000 W/m2

T

T

T

cooling at 1 minor edge only @ 1.9K

wcab = 0.02 mdiso = 0.0001 m = 0.01* T Wm-1K-1

Magnet cooling

3

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

Magnet cooling (2)