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

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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

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MAKING THE PARTS

THE ALL PARTS MADE BY

FERRARA WORKSHOP

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TESTS @ ROOM TEMPERATURE

THE FOLLOWING TESTS HAVE BEEN DONE :

KAPTON CREEP

KAPTON FAILURE PRESSURE

QUALITY OF THE JOINT KAPTON-RESIN-ALUMINUM

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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

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BONDING ALUMINUM FRAME & KAPTON FOIL

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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

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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

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KAPTON FAILURE PRESSURE TEST

FAILURE PRESSURE = 5 bar ACCORDING TO CALCULATION

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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

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JOINT KAPTON-RESIN-ALUMINUM

THE JOINT AFTER KAPTON FAILURE

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COOLING VESSEL

THE COOLING VESSEL @ 1,5 bar

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THE POWER OF THE DETECTOR

16 RESISTORS 222 Ω – 2W

3 THERMOCOUPLES K TYPE(from -50°C to +250°C)

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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

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ACKNOLEDGEMENTS

• COTTA ANGELO (electronic service)

• EVANGELISTI FEDERICO (mechanical service)

• LANDI LUCA (mechanical service)

• PADOAN CLAUDIO (electronic service)

• STATERA MARCO (mechanical service)

SPECIAL THANKS TO :