NED and post-NED WUT NED and post-NED WUT involvementinvolvement

NED S.C. meeting 30.10.2007

Maciej Chorowski

The NED cryostat, construction phase at WUT

Copper thermal shields

Recuperative heat exchanger

Schemat kriostatu wykonanego w I-20 dla NED (Next European Dipole) w ramach VI PR

H e I

H e IIp

H e IIs

Zbiorn ikkriogeniczny

N aczyniepróżniow e

Zbiorn ik H e IIp

Zbiorn ik H e IIs

Zaw iesia p łyty

R ura w ym iennikaciepła

W ym iennikciepła

Zew netrznyekran rad iacyjny

W ew nętrznyekran rad iacyjny

Zaw ór

Płyta

Prow adzeniezaw oru

Ekranyradiacyjne

Ciś

nie

nie

[kP

a]

Tem peratura [K ]

sprężonyH e II

nasyconyH e II

para

ciecz I

c iecz II

nasyconyH e I

K r

superkrytycznyH e

cia ło sta łe

654321

10 4

10 3

10 2

10

1

1.8

1.6

2 1

3

Zaw órrozprężny

Optimization of thermal insulation of the NED cryostat

300 K 300 K

300 K 4.2 K

T(a)

T(b)

LHe

4.2 K

L

a

b

H

q r1

q r2

q r4

q r3 q r5

Naczynie próżniowe

Zewnętrzny ekranradiacyjny

W ewnetrzny ekranradiacyjny

Zbiornikkriogeniczny

x

T(x)

T

X

4.2 K 300 KT(b) T(a)

0

a

b

Thermal shields location optimization

a

b

S

a

b

Sa

b

Sgen

a

b

Sgen

Simplified geometry of the magnet

n =0

Q = h (T - T )A fb fin helium A

n =0

T ( )co il Q = h (T - T )B fin helium Bk

he liu m A

“Q ua si - a d iab a ticp is to n”

n =0

Collar

Collar

he liu m B

Coi

lr = 4 0 m minner

r = 10 0 m mouter

100

m

n =0

rz

Sym metric condition

Sym metric conditionKapton layers

FEM model and boundary conditions of the collar fin for the heat transfer simulations

Input data:

1. Geometry of fin2. Material properties of stainless steel and polyimide (density, specific heat and thermal conductivity)3. Evolution of the coil temperature 4. Boundary conditions from two-volume model5. Heat transfer coefficients

Example of numerical calculation

co lla r

selected points

coil

Quasi- adiabaticpiston

helium A

helium B

a)

b )

Tem

pe

ratu

re [K

]

Tim e [s]

Distance [c

m]

a). Pictorial view of simplified geometry of numerical calculations with the selected points of the collar b) Evolution of the temperature in the fin

Animation of evolution of temperature in the fin

Stability tests of QRL bellows, commissioning of the LHC

Reception tests of cryogenic systems

Reception test of the LHC Cryogenic Distribution Line in sector 7-8 (sub-sectors A and B)

Reception test of the LHC Cryogenic Distribution Line in sector 8-1

- WUT-CERN collaboration

- performed in 2005-2006

- aims: ● to verify overal behaviour of the line at cryogenic temperatures;

● to measure heat inleaks to the circuts 4.5-20K and 50-80K

Reception tests of cryogenic systems

Temperature evolutions of the Cryogenic Distribution Line main

headers during the reception test in sector 8-1

Heat inleakHeat inleak

11-Dec 8818 W

12-Dec 9007 W

13-Dec 8920 W

Heat inleak

with JRwith JR without without JRJR

11-Dec

633.3 W

603.9 W

12-Dec

632.9 W

582.3 W

13-Dec

635.1 W

572.5 W

Measured heat inleaks

to circuit 50-80 K

Measured heat inleaks to circuit 4.5-20 K

Reception tests of cryogenic systems

The LHC Cryogenic Distribution Line during

the reception tests in sector 8-1

Some members of WUT cryogenic grup in the LHC

tunnel

Material Equilibrium structure

1 Ag-Mg Solid solution α (Mg in Ag) 2 Ag-Sn Solid solution α (Sn in Ag) 3 Ag-Sb Solid solution α (Sb w Ag)

4 Ag-Mn Solid solution α (Mn in Ag) and precipitates of solid solution β (Ag in Mn)

5 Ag-Cu-Zr Solid solution α (Cu in Ag) and precipitates of phase/phases rich in Cu and Zr

6 Ag-Cu-Ni Solid solution α (Cu in Ag) and precipitates of phase/phases rich in Cu and Ni

Development of Ag alloys for BSCCO tape sheaths

Material Rp0.2 [MPa]

UTS [MPa]

Elong. [%]

Ag 19 135 47 Ag-Mg 38 150 34 Ag-Sb 37 183 77 Ag-Sn 41 219 75 Ag-Mg II 62 145 20 Ag-Cu-Ni 119 197 23 Ag-Cu-Zr 102 186 20 Ag-Mn 67 217 26

0

50

100

150

200

250

0 10 20 30 40 50 60 70 80

[%]

[M

Pa]

Mechanical properties of designed alloys

Ambient temperature – state after annealing at 830°C/10h

Mechanical properties of designed alloys

77K – state after annealing at 830°C/10h

Material Rp0.2 [MPa]

UTS [MPa]

Elong. [%]

Ag 35 221 86 Ag-Mg 46 236 39 Ag-Sb 39 235 76 Ag-Sn 81 314 84 Ag-Cu-Ni 157 319 33 Ag-Cu-Zr 168 274 24 Ag-Mn 100 281 30

0

50

100

150

200

250

300

350

0 10 20 30 40 50 60 70 80 90 100[%]

[M

Pa]

Furnace atmosphere O2 Ag alloy oxides

boundary of layers discontinuity O O2 Ag O O2 BSCCO

Analysis of oxygen diffusion and internal oxidation in BSCCO tape sheath

O2 Furnace atmosphere Ag alloy Ag BSCCO

Furnace atmosphere O2

Thermal conductivity of sheath material – state after oxidation at 830°C/30h

0

50

100

150

200

250

300

350

400

450

0 50 100 150 200 250 300 350

T [K]

[

W/m

K] Ag

Ag-Sn

Ag-Cu-Zr

Ag-Cu-Ni

Sheath manufacturing

Identification of phase composition of sheath materials in state after recrystallization annealing

Sheath material Phase composition

Ag Ag

Ag-Mg Solid solution of Mg in Ag

Ag-Sn Solid solution of Sn in Ag

Ag-Cu-Zr Solid solution of Cu in Ag and precipitates of CuZr2

Ag-Cu-Ni Solid solution of Cu in Ag and precipitates of Cu3,8Ni

75 mm

BSCCO/Ag/Ag

BSCCO/Ag/Ag-Mg

BSCCO/Ag/Ag-Sn

BSCCO/Ag/Ag-Cu-Zr

BSCCO/Ag/Ag-Cu-Ni

BSCCO tapes manufacturing (IFW Dresden)

20 mm

WUT proposed involvement in WP

WP1 mat. 20 keuro, personnel 12 keuroWP2 mat. 150 keuro, personnel 380 keuroWP3 mat. 20 keuro, personnel 48 keuroWP4 mat. 20 keuro, personnel 48 keuroWP5 mat 20 keuro, personnel 24 keuro

WUT proposed involvement

• 850 keuro• 230 keuro mat• 620 keuro personnel