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

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. 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