PACS IIDR 01/02 Mar 2001 PACS Cryo Harness1 U.Grözinger, D.Lemke, R. Hofferbert Max-Planck-Institut für Astronomie Heidelberg Based on input data from CSL, CEA, IMEC, KT, MPE

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness2 Requirements Provide signal integrity for  14 useful bits of science data for 800 Ge:Ga-detectors and 2560 Bolometer pixels Provide stable and low noise supplies for detector bias, readout circuits, high resolution position sensors Independent supply groups for detectors to minimize risk Low resistance for actuator drive lines to minimize heat dissipation and allow accurate controlling Low heat conduction Goal: Use of ISO-type cables as far as possible

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness3 Triaxial cables for Ge-detector output signals to reduce heat load at 4K-level Shielded twisted pair cables for BOL-detector output signals Low resistance cables for high current lines Special Needs

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness4 PACS Cryo Harness Overview

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness5 PACS Bolometer Harness Overview

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness6 PACS Cryo Mechanics

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness7 PACS Ge-Detector Subsystem

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness8 PACS Ge-Detectors / Distribution Boards

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness9 Examples for connector pin allocations / cable IDs

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness10 Wiring Distribution Boards (example sheet)

PACS IIDR 01/02 Mar 2001 PACS Cryo Harness11 Conclusions PACS cryo harness consists of 1156 lines and 200 shields (overshields additional) Cable types for all signals and supplies are defined => Decision on special types needed (triaxial cables, twisted pairs…) 51 MDM-connectors at outside of FPU. Identification codes and types (size) for all connectors are defined Connector pin allocations are defined Cryo harness document is available