The PIs SelfAssessment

1
The PIs Self-Assessment

• A. Poglitsch

2
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

3
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

4
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

5
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

6
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

7
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