FPI related schedule Model Philosophy Based on

FPI related schedule & Model Philosophy Based on spica_AIVT_rev. C, FPI_review_by_SDR_E Mar. 15 th, 2010 by H. Matsuhara, N. Takahashi, T. Nakagawa

FPI-Related Schedule in Short Term : Review process in Japan as well as International Level FPI REVIEW BY SDR

SPICA Focal Plane 2300 mm MIRACLE-Short FPC-S FPC-G SCI MIRACLE-long

Review process of Japaneselead 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 29 th March, 2010

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

International Review of FPI • Review in Japan • • • 30 th Apr. 2010 : due of Japanese-led instrument May-July: Review by a Japanese board ESA-JAXA Review • Q 2 -Q 3 FY 2010: 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 l Definition of ‘international (review) board/committee’ for the final FPI decision l l l Authority, place in the project structure Policy of membership Review Policy – need to be agreed l l 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.

Necessary Models for the System Level Tests of the FPI Assembly FPIA MODEL PHILOSOPHY & TEST SCHEDULE

Key issues for FPI AIV&T l FPI’s system-level test plan should take account of the critical issues as below: l l (a) FPI is cooled to <5 K with J-T coolers under extremely careful Spacecraft thermal design. (b) disturbance and interference from J-T coolers and AOCS (such as RW, gyro) l l (c) Co-operation with FPC-G to establish the pointing stability l l To assure high-sensitivity (low-noise) in orbit Interferences? Alignment? (d) Co-focus among FPIs (especially MIR’s) l Since STA 2 ry cannot be adjusted so frequently in orbit

FPI Model philosophy l Cold FPIs l l Minimum number of Models required for the system level test (in the previous page) is: l FM (Flight Model) (& its spare) l STM : structure thermal model l CQM : cold qualification model Warm Electronics l l l Similar as above, except for the terminology (CQM PM (protomodel) A concern about SAFARI Warm Electronics STM : can the requested heat dissipation be simulated by a heater? Spacecraft DHS simulator(Space. Wire I/F) will be developed, and distributed hopefully before 2014 ( under discussion)

STM (Structure Thermal Model) for FPIs l Purposes l l l Required Function l l l 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 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 l Oct. 2012 : before starting of assembly of PLM(STM) for the system Mechanical & Thermal Test

CQM (Cold Qualification Model) for FPIs l Purposes l l Required Function l l l 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 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 l l 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 l Purposes l l l Required Function l l l 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 Science Grade optical, noise, and sensitivity performances! Note that after the test called “FPI evaluation at cold”, longwavelength 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) Consistency need to be checked with Industries’ estimates !! 14

FPI: ＳＰＩＣＡ system test plan l With STM: l l With CQM: l l l 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 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 l l l 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) l Purpose l l l Date & Duration l l l Evaluation of PLM cooling system performances Alignment measurement between STA and FPIA with FPC? STM: April 2013 FM: Dec. 2017, ~2 months Method l l Additional shields in the existing 13 m space chamber in Tsukuba Shields are externally lifted by mechanical coolers 16

FPI(CQM or FM) test config. in the 1 st Whole FM V&T l 1 Q-2 Q FY 2016, checkout with FM Bus Module Electronics before assembly/integration of FM Bus System IOB FPI LHe Mech. Cooler (commercial) 17

Summary l Short-term schedule, esp. review process by SDR l l ESA – JAXA review in Q 2 -Q 3 FY 2010 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 l l Two models (STM, CQM) besides FM are proposed Proposed Delivery : Oct. 2012 for STM l Apr. 2015 for CQM l June 2016 for FM – does this meet the SAFARI schedule? l Earlier Delivery of CQM benefits to the mature design of FM l