FPI related schedule &Model Philosophy
Based on spica_AIVT_revC, FPI_review_by_SDR_E
Mar. 15th, 2010
by
H. Matsuhara, N. Takahashi, T. Nakagawa
FPI REVIEW BY SDR
FPI-Related Schedule in Short Term :
Review process in Japan as well as International Level
SPICA Focal Plane
SCI
FPC-S FPC-G
MIRACLE-long
MIRACLE-Short
2300 mm
Review process of Japanese-lead instruments
• Japanese-lead instruments:– MIRACLE, MIRMES, MIRHES, SCI
• Instrument Proposals (including conceptual design report ) shall be submitted by the end of April, 2010.
• Review by a Japanese Board (Selection committee) – prioritize each proposal by July 2010. – prioritize the instrument specifications (not instrument
as a whole) in each FPI, judging by their scientific values and the technical readiness, etc.
– The Details of Review & Decision process will be discussed in the Task Force Meeting on 29th March, 2010
Issues to be addressed in the review
Consistency with the scientific targets described in the Mission Requirement Document
Technical FeasibilityMaturity of results from the concept studyConsistency with the ICS-FPI (ICS-SAFARI,
etc.) Identification of technical development risks,
clear description of prescription against risksPropriety in the development plan, cost, &
team organization
International Review of FPI
• Review in Japan• 30th Apr. 2010 : due of Japanese-led instrument• May-July: Review by a Japanese board
• ESA-JAXA Review• Q2-Q3 FY2010: review for the focal plane instrument
under an international Board / committee • details need to be discussed / agreed
• “SAFARI Phase-A final study report” need to be reviewed also by ESA & JAXA, well before SDR
• Other Instruments• US-lead instrument: review & selection process under
discussion with NASA• Korean-based instrument (FPC) also need to be
reviewed (schedule under discussion)
“FPI Review process”Issues to be agreed
Definition of ‘international (review) board/committee’ for the final FPI decision Authority, place in the project structure Policy of membership
Review Policy – need to be agreed Judgment should be based on the achievement
in the “Issues to be addressed” (see page 4) For Japanese-lead instrument, JAXA proposes to
make selection based on the function/coverage of the instrument within SPICA and not on the individual instrument.
FPIA MODEL PHILOSOPHY & TEST SCHEDULE
Necessary Models for the System Level Tests of the FPI Assembly
Key issues for FPI AIV&T
FPI’s system-level test plan should take account of the critical issues as below: (a) FPI is cooled to <5K with J-T coolers under
extremely careful Spacecraft thermal design. (b) disturbance and interference from J-T
coolers and AOCS (such as RW, gyro) To assure high-sensitivity (low-noise) in orbit
(c) Co-operation with FPC-G to establish the pointing stability
Interferences? Alignment? (d) Co-focus among FPIs (especially MIR’s)
Since STA 2ry cannot be adjusted so frequently in orbit
FPI Model philosophy
Cold FPIs Minimum number of Models required for the system level test (in
the previous page) is: FM (Flight Model) (& its spare) STM : structure thermal model CQM : cold qualification model
Warm Electronics Similar as above, except for the terminology (CQM PM
(proto-model) A concern about SAFARI Warm Electronics STM : can the
requested heat dissipation be simulated by a heater? Spacecraft DHS simulator(SpaceWire I/F) will be developed,
and distributed hopefully before 2014 ( under discussion)
STM (Structure Thermal Model) for FPIs
Purposes Evaluate their mechanical (at ambient temp.) & thermal
compliances at cold, in the system level (PLM or Spacecraft) Evaluate transfer function of mechanical disturbances
originated from FPIs Required Function
Same mechanical I/F specifications to FM Same thermal I/F specifications to FM Equipped with thermometers, acceleration sensors for
measurement of I/F environmental condition Simulate mechanical disturbance according to the system
operation modes Proposed Delivery
Oct. 2012 : before starting of assembly of PLM(STM) for the system Mechanical & Thermal Test
CQM (Cold Qualification Model) for FPIs
Purposes Evaluate thermal compliance at cold with J-T(PM) cooler Evaluate susceptibility to mechanical disturbances from J-T
(disturbance simulator) and AOCS simulator Evaluate electrical interferences among FPIs, J-T, AOCS
Required Function Same thermal, mechanical, electrical I/F specifications to FM Equipped with detectors operable at low-temperature, with the
same noise performance as that of FM Simulate heat-dissipation (load to J-Ts), mechanical disturbance
according to the system operation modes Equipped with a optical image, to check the co-focus among
FPIs Proposed Delivery
Apr. 2015 : when the PLM(FM) is available for us to test the items in page 2.
Earlier delivery enables us to feedback for the design of FM
FM (Flight Model) for FPIs
Purposes For on-orbit observations; for our scientific objectives, of
course! After delivery and assembly to FPIA, FM will go to the
“evaluation at cold” in the dedicated chamber for evaluation of interferences, co focus among FPIs
Required Function Science Grade optical, noise, and sensitivity performances! Note that after the test called “FPI evaluation at cold”, long-
wavelength channel detectors cannot be operated (even may not be switched on??) - so how to verify its health during the long waiting time before launch/cooling in orbit?
Delivery date of FM:
June 2016 (August 2016 at worst) in the proposed scenario.
SPICA AIV&T timeline (tentative)
14Consistency need to be checked with Industries’ estimates !!
FPI: SPICA system test plan
With STM: Mechanical Environmental test & thermal test at cold at the PLM
level Mechanical Environmental test & Thermal balance test at
Spacecraft level Measure disturbance at FPI from J-T cooler/AOCS
With CQM: Cooling compliance test with J-T (PM) most important Evaluate susceptibility to mechanical disturbances from J-T
(disturbance simulator) and AOCS simulator, Co-focus is also checked to some level at cold (tbd) Evaluate electrical interferences among FPIs, J-T, AOCS in the
1st whole FM V&T in 2016 if FM is not available yet With FM
FPI evaluation at cold (optical & electrical) STA optical performance test at cold Thermal test at cold at PLM level
15
PLM Thermal Test at cold(STM and FM)
Purpose Evaluation of PLM cooling
system performances Alignment measurement
between STA and FPIA with FPC?
Date & Duration STM: April 2013 FM: Dec. 2017, ~2months
Method Additional shields in the
existing 13m space chamber in Tsukuba
Shields are externally lifted by mechanical coolers
16
IOB
FPI FPI
LHe
Mech. Cooler (commercial)
FPI(CQM or FM) test config. in the 1st Whole FM V&T
1Q-2Q FY2016, checkout with FM Bus Module Electronics before assembly/integration of FM Bus System
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Summary
Short-term schedule, esp. review process by SDR ESA – JAXA review in Q2-Q3 FY2010 should be
discussed / agreed “SAFARI Phase-A final study report” need to be
reviewed also by ESA & JAXA, well before SDR “The Review policy” need to be agreed
FPI Model Philosophy Two models (STM, CQM) besides FM are proposed Proposed Delivery :
Oct. 2012 for STM Apr. 2015 for CQM June 2016 for FM– does this meet the SAFARI schedule? Earlier Delivery of CQM benefits to the mature design of FM