na62 silicon pixels detector
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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 − PE2s
DI − PE
σ L =DI PI − PE( ) − 4PE
sDI
1+ sDI
⎛ ⎝ ⎜
⎞ ⎠ ⎟
⎡
⎣ ⎢
⎤
⎦ ⎥
4s 1+ sDI
⎛ ⎝ ⎜
⎞ ⎠ ⎟
σ R = − PI + PE2
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
€
σ EQ = PIDI2s
+ PI2
PI =σ EQ2sDI + 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
€
Joint failure load = Kapton failure load = 230 MPaOverlap length : L = 10 mm
Kapton thickness : T = 5 ×10−5 m
Kapton tensile stress : σ K = PT
= 230 MPa
Load per unit width : P = σ K ×T =11500 N/m = 11,5 N/mmOverlap shear failure strength : τ R = 2,2 MPa
Overlap shear strength : τ = load per unit widthlength of overlap
MPa
Minimum overlap length : LMIN = load per unit widthoverlap shear failure strength
= 115002,2 ×106 = 5,2 mm
Safety factor : SF = LLMIN
= 105,2
=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
16Vittore Carassiti - INFN FECERN , 26/10/2009
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 :
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