Pacs ibdr
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PACS IBDR. Budgets and Interfaces. Reinhard Katterloher. Instrument Interfaces to S/C. Mechanical interface FPU to OB Mechanical interface WE to SVM Mechanical interface BOLA to CVV Thermal interface FPU to S/C cooling system, FPU requires temperature level 0 and 1

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PACS IBDR

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Pacs ibdr

PACS IBDR

Budgets and Interfaces

  • Reinhard Katterloher

System Engineering


Instrument interfaces to s c

Instrument Interfaces to S/C

  • Mechanical interface FPU to OB

  • Mechanical interface WE to SVM

  • Mechanical interface BOLA to CVV

  • Thermal interface FPU to S/C cooling system, FPU requires temperature level 0 and 1

  • Electrical interface WE to S/C

  • Electrical interface FPU to WE

  • Optical interface FPU to telescope beam

  • Optical interface FPU alignment cube to outside CVV alignment tools

System Engineering


Fpu and interfaces schematic

FPU and Interfaces Schematic

System Engineering


Fpu ob interface view to pacs fpu from below

FPU – OB interface (view to PACS FPU from below)

System Engineering


Thermal budget and interface fpu s c cryostat

Thermal Budget and Interface FPU - S/C cryostat

  • FPU requires two temperature levels- level 0 at nominal 1.7K (max. 1.75K accepted)- level 1 around 4K (max. 5.0K accepted)

  • Other temperatures inside the FPU are produced autonomously (2.2K blue array/ 0.3K bolometers)

  • Thermal coupling to level 0 via 4 heat straps

  • Thermal coupling to level 1 via 3 heat straps

  • FPU is thermally decoupled from OB by CFRP feet

  • Thermal loads and final heat fluxes can be calculated using the PACS TMM combined with the cryostat TMM

System Engineering


Dissipated heat loads input to tmm

Dissipated Heat Loads (input to TMM)

System Engineering


Electrical budget and interface fpu we s c

Electrical Budget and interface FPU– WE– S/C

  • Harness as specified in PACS-MA-SP-001 has- total inside CVV: 1100 wires + 227 shields + 30 tbc overshields- total outside CVV/BOLA: 1148 wires + 233 shields + 30 tbc overshields

  • Power consumption of WE see separate table

  • Science data rate in PACS prime mode is 120 kbps average per day

System Engineering


Mass and size of units

Mass and Size of Units

System Engineering


Power consumption on svm

Power Consumption on SVM

Peak power consumptions and inrush currents are provided in IID-B CR-0011A

Power dissipation in BOLA on CVV is 0.2W

System Engineering


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