First Assessment 1

PACS IQR 13 Jan 2005

The PI’s Self-Assessment

A. Poglitsch

First Assessment 2

PACS IQR 13 Jan 2005

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

First Assessment 3

PACS IQR 13 Jan 2005

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

First Assessment 4

PACS IQR 13 Jan 2005

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

First Assessment 5

PACS IQR 13 Jan 2005

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

First Assessment 6

PACS IQR 13 Jan 2005

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

First Assessment 7

PACS IQR 13 Jan 2005

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