PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 1 PACS Instrument Intermediate Design Review (IIDR) Reinhard Katterloher Budgets and Interfaces

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 2 Scheme of FPU and I/F

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 3 Instrument Interfaces to S/C Mechanical interface to OB (FPU) ! Mechanical interface to SVM (WE) Mechanical interface to CVV (BOLA) Thermal interface to S/C cooling system ! (FPU to temperature level 0 and 1 only) Electrical interface to S/C (data, power, sync) Electrical interface (FPU to WE) Optical interface (FPU to telescope focus) ! ! means: AI pending

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 4 Pending AIs on Interfaces PACS/HIFI/SPIRE accomodation on OB: identify solution (clearance) using the detailed technical drawings of instruments Number of cooling straps: PACS to put the requirements (4+1) into IID-B Telescope – PACS: PACS provided report on used telescope design for the optical model ESA to provide a telescope model (optical prescription, temperature, emissivity, stray light)

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 5 Mechan. Budget and I/F: Size+Mass of Units Project codeInstrument unitDimensions (mm)Mass (kg) FPFPUCold Focal Plane Unitenvelope max. 920 x TBC FPDEC1Detector Control 1tbd x 240 x FPDEC2Detector Control 2tbd x 240 x FPMEC1Mechanism Control 1tbd x 240 x FPMEC2Mechanism Control 2tbd x 240 x FPBOLCBolometer and Cooler Control248 x 279 x FPBOLABolometer Buffer Amplifier180 x 230 x FPDPUDPU240 x 258 x FPSPU nomSPU nominal240 x 218 x FPSPU redSPU redundant240 x 218 x FPWIH“Warm” Interconnecting Harness length  1000 (each part) 1.5 TOTAL Dimensions are given as Length x Width x Height. Length and width define the fixation baseplate.

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 6 FPU Envelope

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 7 FPU Side View (Entrance Focus)

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 8 Suspension Location on OB

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 9 Thermal Budget and I/F: FPU- S/C cryostat FPU requires two temperature levels - level 0 at 1.7K (max. 1.75K accepted) - level 1 around 4K (max. 5.0K accepted) Other temperatures inside the FPU are produced autonomously (2.2K / 0.3K) Thermal coupling to level0 via 4 heat straps Thermal coupling to level1 via 1 (tbc) heat strap FPU is thermally decoupled from OB Thermal loads are given in the following table

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 10 Temperatures and Heat Loads (TMM)

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 11 Electrical Budget and I/F: FPU– WE– S/C Harness - cryogenic part (1100 wires+199 shields tbc) - interconnecting WE part - S/C supply part - S/C data part Power consumption of WE see following table Telemetry budget will be detailed under Agenda point PACS Data Flow

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 12 Harness Schematic

PACS IIDR ESTEC 01/02 March 2001 Budgets and Interfaces 13 WE Power Consumption in Primary Mode Project codeInstrument UnitPower Dissipation (W) FPDEC1Detector Control 112 FPDEC2Detector Control 212 FPMEC1Mechanism Control 118 FPMEC2Mechanism Control 218 FPBOLCBolometer/Cooler Contr22.5 FPDPUDPU15 FPSPUSPU20 TOTAL on SVM117.5 on CVV outside2.5