FPI related schedule & Model Philosophy Based on spica_AIVT_revC, FPI_review_by_SDR_E Mar. 15 th, 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-SFPC-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, Review by a Japanese Board (Selection committee) – prioritize each proposal by July – 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 29 th March, 2010

Issues to be addressed in the review Consistency with the scientific targets described in the Mission Requirement Document Technical Feasibility Maturity of results from the concept study Consistency with the ICS-FPI (ICS-SAFARI, etc.) Identification of technical development risks, clear description of prescription against risks Propriety in the development plan, cost, & team organization

International Review of FPI Review in Japan 30 th Apr : 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 : 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 : 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) 14 Consistency 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 1 st 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 LHe Mech. Cooler (commercial) FPI(CQM or FM) test config. in the 1 st Whole FM V&T 1Q-2Q FY2016, checkout with FM Bus Module Electronics before assembly/integration of FM Bus System 17

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 for STM Apr for CQM June 2016 for FM – does this meet the SAFARI schedule? Earlier Delivery of CQM benefits to the mature design of FM