na62 silicon pixels detector cooling vessel prototype status report cooling vessel prototype status...
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NA62 SILICON PIXELS DETECTOR
COOLING VESSEL PROTOTYPESTATUS REPORT
Vittore Carassiti - INFN FECERN , 26/10/2009
2Vittore Carassiti - INFN FECERN , 26/10/2009
PARTS MATERIAL
PART MATERIAL
PCB GLASS FIBER
VESSEL WALL KAPTON TYPE H
VESSEL FRAME ALUMINUM
RESIN EPOXY (ARALDITE 2012)
MATERIALS
3Vittore Carassiti - INFN FECERN , 26/10/2009
MATERIAL PROPERTIES
MATERIAL DENSITY (Kg/m^3)
THERMAL CONDUCTIVITY
(W/mK)
CTE(K^-1)
ELASTIC MODULUS
(Pa)
POISSON’S RATIO
TENSILE STRENGTH
(Pa)
GLASS FIBER 2076 0,83 6,7E-06 45E+09 0,28 48E+06
KAPTON TYPE H 1420 0,16 45E-06 2,5E+09 0,34 230E+06
ALUMINUM 2700 237 23,5E-06 70,6E+09 0,345 120E+06
EPOXY(ARALDITE
2012)1180 0,22 30E-06 2,5E+09 0,34 60E+06
MATERIALS
4Vittore Carassiti - INFN FECERN , 26/10/2009
MAKING THE PARTS
THE ALL PARTS MADE BY
FERRARA WORKSHOP
5Vittore Carassiti - INFN FECERN , 26/10/2009
TESTS @ ROOM TEMPERATURE
THE FOLLOWING TESTS HAVE BEEN DONE :
KAPTON CREEP
KAPTON FAILURE PRESSURE
QUALITY OF THE JOINT KAPTON-RESIN-ALUMINUM
6Vittore Carassiti - INFN FECERN , 26/10/2009
BONDING ALUMINUM FRAME & KAPTON FOIL
PREPARATION OF THE JOINTS :
ALUMINUM JOINT ABRADED AND DEGREASED
KAPTON JOINT LIGHTLY ABRADED AND DEGREASED
CURING TIME : 16 h @ 40°C
7Vittore Carassiti - INFN FECERN , 26/10/2009
BONDING ALUMINUM FRAME & KAPTON FOIL
8Vittore Carassiti - INFN FECERN , 26/10/2009
KAPTON CREEP TEST
Working pressure Wp = 1 bar
Test pressure Tp = 2Wp = 2 bar
AFTER TWO WEEKS @ Tp NO EVIDENCEOF CREEP SMALL RESIDUAL DEFORMATION AFTERVENTING
9Vittore Carassiti - INFN FECERN , 26/10/2009
KAPTON FAILURE PRESSURE
STRESS ON THE VESSEL
€
σP =(PI − PE
2sDI − PE
σ L =
DI PI − PE( ) − 4PEs
DI1+
s
DI
⎛
⎝ ⎜
⎞
⎠ ⎟
⎡
⎣ ⎢
⎤
⎦ ⎥
4s 1+s
DI
⎛
⎝ ⎜
⎞
⎠ ⎟
σ R = −PI + PE
2
BOUNDARY CONDITIONS
Pi = 0,1 Mpa (inner pressure)Pe = 0 (outher pressure)s = 5E-05 m (wall thickness)Di = 47E-03 m (inner diameter)
EQUIVALENT TENSILE STRESS(Guest criterion)
€
σEQ =σ MAX −σ MIN =σ P −σ R
σ EQ = Kapton tensile strength = 230 MPa
FAILURE PRESSURE CALCULATION
€
σEQ =PIDI2s
+PI2
PI =σ EQ2s
DI + s=
230 ×106 × 2 × 5 ×10−5
47 ×10−3 + 5 ×10−5= 4,9 bar
10Vittore Carassiti - INFN FECERN , 26/10/2009
KAPTON FAILURE PRESSURE TEST
FAILURE PRESSURE = 5 bar ACCORDING TO CALCULATION
11Vittore Carassiti - INFN FECERN , 26/10/2009
JOINT KAPTON-RESIN-ALUMINUM
LENGTH OF THE OVERLAP CALCULATION
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Joint failure load = Kapton failure load = 230 MPa
Overlap length : L = 10 mm
Kapton thickness : T = 5 ×10−5 m
Kapton tensile stress : σ K =P
T= 230 MPa
Load per unit width : P =σ K ×T =11500 N/m = 11,5 N/mm
Overlap shear failure strength : τ R = 2,2 MPa
Overlap shear strength : τ =load per unit width
length of overlap MPa
Minimum overlap length : LMIN =load per unit width
overlap shear failure strength=
11500
2,2 ×106= 5,2 mm
Safety factor : SF =L
LMIN=
10
5,2=1,92
12Vittore Carassiti - INFN FECERN , 26/10/2009
JOINT KAPTON-RESIN-ALUMINUM
THE JOINT AFTER KAPTON FAILURE
13Vittore Carassiti - INFN FECERN , 26/10/2009
COOLING VESSEL
THE COOLING VESSEL @ 1,5 bar
14Vittore Carassiti - INFN FECERN , 26/10/2009
THE POWER OF THE DETECTOR
16 RESISTORS 222 Ω – 2W
3 THERMOCOUPLES K TYPE(from -50°C to +250°C)
15Vittore Carassiti - INFN FECERN , 26/10/2009
THE ASSEMBLY
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NEXT STEP : CECKING THE COOLING IN VACUUM
DN 160 CF FLANGE
ELECTRICAL CONNECTIONS & POWER SUPPLY
NITROGEN IN-OUT
COOLING VESSEL
17Vittore Carassiti - INFN FECERN , 26/10/2009
ACKNOLEDGEMENTS
• COTTA ANGELO (electronic service)
• EVANGELISTI FEDERICO (mechanical service)
• LANDI LUCA (mechanical service)
• PADOAN CLAUDIO (electronic service)
• STATERA MARCO (mechanical service)
SPECIAL THANKS TO :