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PACS IBDR

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System Engineering. 2. PACS IBDR. MPE 27/28 Feb 2002. Instrument ... Science data rate in PACS prime mode is 120 kbps average per day. System Engineering ... – PowerPoint PPT presentation

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Title: PACS IBDR


1
PACS IBDR
  • Budgets and Interfaces

Reinhard Katterloher
2
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

3
FPU and Interfaces Schematic
4
FPU OB interface (view to PACS FPU from
below)
5
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

6
Dissipated Heat Loads (input to TMM)
7
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

8
Mass and Size of Units
9
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
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