hie-isolde cryomodulets-msc-ci.web.cern.ch/ts-msc-ci/files/section-meetings/... · 2014-11-13 · 0...
TRANSCRIPT
L.ValdarnoTE-MSC-CMI, CERN7th October 2014
HIE-ISOLDE CryomoduleThermal Analysis – 2nd part
About the 1st part1
2
3
4
2
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
3
Objective
Targets:
1. Global temperature and heat flux mapping; 2. Design validation;3. Validation of the experimental tests;4. Simulation tool for future thermo-mechanical analysis;
« A model is a selective abstraction of the reality »• Problem formulation• Analytical estimations• FEM model• Analysis of the results
HIE-ISOLDE: Procedure
4
1. Initial status 300K structures
2. Thermal shield cool down 300K-75K 13 bar
3. Reservoir + frame cool down 300K-75K 2.5 bar
4. Reservoir + frame cool down 75K-4.5K 2.5 bar
5. Global cool down• Thermal shield circuit : 13barG, 55-75K• Cold mass circuits: 1.3 barG, 4.5K
5
HIE-ISOLDE: Model
Vacuum vessel Top plate Thermal shield Cryogenics circuit
Supporting frame assembly Actively cooled frame Suspension rods
Helium reservoir Cryogenics piping
5 cavities 1 solenoid
LHe reservoir :-250 l capacity-Ø 0.35m, t=4mm-316L electro-polished-Lower flanges location within 1 mm
Supporting frame :-2.1m x 0.4m x 0.4m
-316L, electro-polished-130 kg welded assembly
-Piping : LHe 4.5K, 4.5 bara
Thermal Shield :-2.2m x 1.8m x 0.9m
-300 kg bolted assembly-2 mm thick Cu Ni-plated
-Piping : GHe 70K, 13 bara-No porosities after brazing
Vacuum vessel:-15 mm (40mm) thick plates-316L polished-4.5 T welded assembly
6
HIE-ISOLDE: Model checks
Finite Element Model (source ESA/ECSS standards):
Geometry Mesh Loads Rigid body motion
7
Thermal steady-state analysis
OB: Radiative heat transfer between the Vacuum Vessel and the Thermal Shield Emissivity
Vacuum vessel: 0.2 Thermal shield: [0.033,0.066]
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.1150
100
150
200
250
300
350
400
450
500
emissivity of TS
Hea
t loa
d to
TS
[W]
Two thermalisations
One thermalisation
Only conduction 50 h 65 hConduction + radiation 21 h 23 h
About 1st part1
2
3
4
8
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
9
Supporting frame
Ob: temperature mapping during the cooling down
Hp: 1. Isolated system;2. Perfect contact between the parts;
Loads: Conduction; Forced convection in the cooling circuit @4.5K; Radiation to the TS@70K;
Materials: Frame: stainless steel 316L Thermalisations: copper
10
Supporting frame
Hp: isolated system
Cooling phase 2: TS@70K CM warm
Tin=300K
Boundary conditions: T(A)=300K T(B)=T(C)=70K Rad on the panel
0 10 20 30 40 50 60 70 80 90 100275
280
285
290
295
300
time [h]
tem
pera
ture
[K]
probe n.1
without radiationwith radiation
0 10 20 30 40 50 60 70 80 90 100100
120
140
160
180
200
220
240
260
280
300
time [h]
tem
pera
ture
[K]
probe n.2
without radiationwith radiation
0 10 20 30 40 50 60 70 80 90 10080
100
120
140
160
180
200
220
240
260
280
300probe n.4
time [h]
tem
pera
ture
[K]
without radiationwith radiation
0 10 20 30 40 50 60 70 80 90 10050
100
150
200
250
300
time [h]
tem
pera
ture
[K]
probe n.3
without radiationwith radiation
11
Frame
Heat flux in the stainless steel tube
0 1 2 3 4 5 6 7 8 9 10
50
100
150
200
250
300temperature probe n.1
time [h]
tem
pera
ture
[K]
continuous contactwelded contacts
0 1 2 3 4 5 6 7 8 9 10
50
100
150
200
250
300temperature probe n.3
time [h]
tem
pera
ture
[K]
continuous contactwelded contacts
0 200 400 600 800 1000 1200 1400 1600 1800 2000
20
40
60
80
100
120
140
160
180
200Temperature distribution with welded contacts
length [mm]
tem
pera
ture
[K]
1h3h6h9h
Hp: isolated system
Cooling phase 3-4: TS@70K Frame 300K to 4.5K
Boundary conditions: Forced convection:
continuous contact vs. welded contact Constant h vs. variable h(x)
Radiation TS@70K
12
Frame
Fully developed turbulent flow Hp: isolated system
Cooling phase 3-4: TS@70K Frame 300K to 4.5K
Boundary conditions: Forced convection:
continuous contact vs. welded contact Constant heat flux vs. variable
Radiation TS@70K
0 200 400 600 800 1000 1200 1400 1600 1800 2000
50
100
150
200
250Temperature distribution
length [mm]
tem
pera
ture
[K]
1h3h6h9h
13
Frame
0 200 400 600 800 1000 1200 1400 1600 1800 2000
20
40
60
80
100
120
140
160
180
200Temperature distribution with welded contacts and radiation
length [mm]
tem
pera
ture
[K]
1h1h rad3h3h rad6h6h rad9h9h rad
Hp: isolated system
Cooling phase 3: TS@70K Frame 300K to 4.5K
Boundary conditions: Forced convection Radiation TS@70K
0 1 2 3 4 5 6 7 8 9 10
50
100
150
200
250
300temperature probe n.1
time [h]
tem
pera
ture
[K]
welded contactswelded and radiation
0 1 2 3 4 5 6 7 8 9 10
50
100
150
200
250
300temperature probe n.4
time [h]
tem
pera
ture
[K]
welded contactswelded and radiation
14
Supporting frame
Hp: isolated system
Cooling phase 3-4: TS@70K Frame 300K to 4.5K
Boundary conditions: Forced convection Radiation TS@70K
About 1st part1
2
3
4
15
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
16
Omega Plate
Ob: determination of the displacement of the targets
Hp: 1. Isolated system;2. Perfect contact between the parts;
Loads: Conduction 4.5K on thermalisation;
Materials: Frame: stainless steel 316L Thermalisation: copper Targets: titanium
17
Omega Plates
About 1st part1
2
3
4
18
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
19
Vacuum vessel cleaning (1/2)
Ob: Stress analysis/buckling verification of the bottom beams of the vacuum vessel for cleaning;
Hp: 1. Isolated system;2. Perfect contact between the parts;
Loads: Gravity; Fluid:
density ρ=2ρH2O=2000 kg/m3 ; volume V=4 m3;
Materials: Stainless steel 316L
The bottom plate of the vacuum vessel is affected by a max totaldeformation of 0.64 mm under the mentioned load condition. Themaximum von Mises stress on the bottom plate is 60MPa, 2.8 timesbelow the yield strength.
20
Vacuum vessel cleaning (2/2)
The linear bucking analysis shows a load multiplier (buckling factor of safetyfor the applied load) of 125.46 on the first mode
In the large deformation analysis, a total load of 500,000N (conservative assumption) isapplied in 4 steps together with an additional lateral force of 500N in order to createinstability.The section shows stress over 130MPa around 60,000N (in line with the results from theelastic analysis). After this limit the plastic region starts to spread all around the beam evenif any bucking phenomenon is still not involved.
About 1st part1
2
3
4
21
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
RF cable
Top of the cryostat
41.5
Elbow N connectors
≈ 2000
coupler
Thermal shield
41 ≈ 150
Ob: temperature mapping of the RF cable
Hp: 1. Isolated system2. Perfect contact between the parts;
Loads: Conduction; Power generation: Joule effect; Radiation to ambient;
Materials: stainless steel 316L Thermalisations: copper
22
Part Material
Core copper
Dielectric Foamed polyethylene
23
RF cable
0 100 200 300 400 500 600 700 800 900 1000
69.5
70
70.5
71
length [mm]
tem
pera
ture
[K]
Temperature along the tube
300-70300-70-rad70300-70-rad70-4.5300-70-rad70-4.5-rad70
0 500 1000 1500 2000
50
100
150
200
250
300Temperature along the RF cable
length [mm]
tem
pera
ture
[K]
300-70300-70-rad70300-70-rad70-4.5300-70-rad70-4.5-rad70
0 500 1000 1500 2000
50
100
150
200
250
300
length [mm]
tem
pera
ture
[K]
Temperature along the RF cable
q = 0.5Wq = 5W
About 1st part1
2
3
4
24
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
25
Solenoid Splice
Insulator
Insulator
316L316L Insulator
Bus bar
Solenoid lead
Parameters :
R < 10 nΩ Dynamic heat dissipation < 1mW 120A nominal Self protected
Ob: determination of the thermal transient behaviour of the TS
Hp: 1. Isolated system;2. Perfect contact between the parts;
Loads: Heat generation for joule effect; Forced convection @4.5K;
Materials: Stainless steel 316L Copper RRR100
26
Solenoid Splice
About 1st part1
2
3
4
27
Outline
Omega plates
Supporting frame
Vacuum vessel cleaning
5
6
7
Solenoid splice
RF cable
Conclusions and next steps
28
Conclusions
Thermal network; General analytical estimation of heat loads inside the cryomodule –
updated version; FEM model – validated with the ECSS standards; Global thermal steady state analysis; Transient steady state analysis; Advanced analysis on some cases;
Next steps:
Limits for cryogenic mass flow Alignment Current leads Instrumentation
29
References
[1] S. Kasap, Essential Heat Transfer for Electrical Engineers: Second Edition, 2003.[2] Y. Leclercq, “Heat load estimation for the HIE-ISOLDE cryomodule,” CERN, 2013-03-12.[3] N. Delruelle and Y. Leclercq, “Cryogenic procedures, layout and operation of the HIE-ISOLDE cryomodule,” CERN, 2013-07-01.[4] D. Ramos, “Radiation heat exchange in the HIE-ISOLDE cryomodule,” CERN, 2013-08-01.[5] L. Williams, “Cryostat for HIE-ISOLDE high energy cryomodule,” CERN, 2010-06-17.