PACS IQR 13 Jan 2005 First Assessment1 The PI’s Self-Assessment A. Poglitsch

PACS IQR 13 Jan 2005 First Assessment2 Achievements PACS integrated FPU mechanical/thermal/optical qualification/performance verified (with some understood exceptions) –Subunits function/perform as expected after integration –Remaining open issues are concrete, isolated problems that can be solved Almost all S/C interfaces settled, budgets (mass, electrical power, thermal power) stable PACS system operability (FPU + WE/OBSW + OGSE + EGSE) demonstrated Test & calibration plan + use of IA/QLA shown viable

PACS IQR 13 Jan 2005 First Assessment3 The Schedule and Its Consequences Several subunits on critical path (detectors, DECMEC, DPU?) Some modifications of FM subunits and OGSE mandatory No margin 6 month of FM ILT minimum Delivery on official need date (Nov 2005) impossible  Project will have to find ways to accommodate FM delivery in March 2006 – no recovery in sight

PACS IQR 13 Jan 2005 First Assessment4 PACS Areas of Concern Warm Electronics + OBSW Late qualification / late delivery of QM/FM units System stability / frequent crashes (H/W? S/W?) Potentially insufficient autonomy functions –If system stabilty does not improve dramatically then better recovery scheme needed –Improper commanding can damage FPU H/W DPU: Burst mode not working with CDMU SPU: Memory corruption; insufficient compression with reasonable CPU load BOLC: No immunity to uncontrolled power loss DECMEC: FPGA overheating, link losses; performance and operability still need to be demonstrated. Grounding scheme still open

PACS IQR 13 Jan 2005 First Assessment5 PACS Areas of Concern Photoconductor/readout performance –Required sensitivity not demonstrated yet –“FS” CREs to be used with FM detectors show promising performance, but measurements with detectors still missing Bolometer performance –QM bolometer performance insufficient –FM bolometer performance at subarray level probably ok –Performance at PhFPU level to be demonstrated, yet OGSE performance –Reproducibility of alignment –Scale/focus error

PACS IQR 13 Jan 2005 First Assessment6 PACS Areas of Concern Late availability of ILT analysis in some areas –There may be yet unidentified problems that could surface too late to be addressed in the final H/W implementation Lack of resources in some partner institutes to address known problems in time L0 interface as provided by industry for EQM tests and as foreseen for FM is incompatible with PACS requirements H field susceptibility – photometer performance could be seriously compromised

PACS IQR 13 Jan 2005 First Assessment7 Future Strategy Optimise/prioritise implementation of changes to H/W Improve reviewing/monitoring of subunit progress by PACS System Engineering –H/W + S/W –Subunits must be delivered fully tested Optimise FM ILT planning –Early execution and timely analysis of tests needed for performance verification Keep planning flexible to accomodate any adjustment in S/C schedule –Work towards open exchange on schedule between all involved parties –Extension of ILTs should always be possible/welcome