SLIDE 1
ProtoDUNE Signal Feedthru
2
ProtoDUNE Single Phase Signal Feedthrough Cross Tube Cable Support - - PowerPoint PPT Presentation
ProtoDUNE Single Phase Signal Feedthrough Cross Tube Cable Support - - PowerPoint PPT Presentation
ProtoDUNE Single Phase Signal Feedthrough Cross Tube Cable Support and Cable Routing Manhong Zhao 4/19/2017 Brookhaven National Laboratory ProtoDUNE Signal Feedthru Cold Cables Signal Feedthru Chimney CE Box APA 2 Cross Tube Cable
SLIDE 2
SLIDE 3
Cross Tube Cable Support
3
SLIDE 4
Cross Tube Cable (CTC) Support
4
CE Flange PD Flange Cryostat Insulation Cross Tube Tee Cable Strain Relief Adjustment Screws for Tube Alignment Hood
SLIDE 5
Cable Strain Relief
5
ProtoDUNE (1 chimney per APA): 22 CE cable bundles (2 for extra) 2 PD cable bundles (10 PD cables + 2 extra) 1 SHV cable bundle (8 SHV cables)
SLIDE 6
Stress Analysis of CTC Support Inner Tube
6
20 kgf force applied on the cable clamping plate along horizontal direction
SLIDE 7
CFD Model of Signal Feedthrough Chimney
7
Outer surfaces 6 W/m2-K @ 293 K Gas outlet: 0.35 g/s Water mass flux from Teflon cable insulation 87.93 K @ LAr/GAr interface
Reference: ProtoDUNE Ullage Space CFD Model, Erik Voirin
GAr temperature in ullage
Liquid Surface Boil Off Flux of ProtoDUNE: 21 g/s from Liquid Model (see Ref)
SLIDE 8
Water release of Teflon wire insulation
8
H2O_Flux = 0.216*sqrt(2.715e-12*exp(-4988[K]/T)) [kg m^-2 s^-1] Assume after 100 days drying
Reference: Mass Transport of Water in Teflon Down to Cryogenic Temperatures; a Transient Numerical Analysis, Erik Voirin
H2O mass flux at Teflon surface
SLIDE 9
Diffusion Coefficient of Water in Argon Gas
9
Diffusion12 T ( ) 1.86 10
3 −
⋅ T
3 2
⋅
kg kmol
M1
kg kmol
M2 + ⋅ P atm 1 2 σ1 σ2 +
( )
2
⋅ 2.6693 10
6 −
⋅ MAr
kg kmol
T ⋅
1 2
⋅
µAr T ( ) Pa s ⋅ σAr Angstrom
2
⋅ ⋅
Reference: Diffusion Coefficients of Water and Oxygen in Argon, Erik Voirin
The curve can be fitted as H2O_Diff = 0.275 [cm^2 s^-1] * (T/300[K])^1.9*(1 [atm] /Pressure)
SLIDE 10
Results: Gas Flow, Temperature and Moisture Diffusion
10
Gas flow in chimney Temperature Moisture Diffusion
Moisture diffused into ullage ~ 9x10-16 g/sec
SLIDE 11
Cable Routing
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SLIDE 12
Cable Routing
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PD cables CE cables PD cables CE cables PD cables CE cables
SLIDE 13
Cable Routing
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SLIDE 14
Cable Routing
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Differential length stored in this cable tray
SLIDE 15
Cable Routing
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SLIDE 16
Cable Routing
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Differential length of PD cables is stored in a cable tray that is installed at the back side of APA.
SLIDE 17
Cable Routing
17
CE cables PD cables
SLIDE 18
Cable Routing
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