Far Infra Red Mission Candidate

Transcription

1 TALC Roadmap

2 Far Infra Red Mission Candidate TALC is one of the serious technological option that adresses the science case Far-InfraRed Mission of the topics that were submitted to the Cosmic Vision L-class competition process. Access to this important waveband will continue to be highly desirable, and in some cases crucial in the decades to come

3 Why TALC? Sub-arcsecond space astronomy is currently in a deadlock: Our paradigm : build larger structures mean more volume, more mass, more budget The launcher industry is driven by commercial applications: maintain launch cost low, lower orbits, small mass, small volumes. Breaking this deadlock means changing a number of paradigms: Allow flexible deployable structures: dynamic control in zero-g, vibration damping. Develop process to build extremely lightweight mirrors by replication for massproduction Adopt active optics principles to a space telescope without any supporting structure

4 TALC Design criteria Higher resolution than a filled telescope after image reconstruction Being annular TALC features a main beam equivalent to that of a 27m telescope, i.e. an angular resolution of 100 µm µm Herschel TALC Filled telescope 9.5 m2 Ø3.5 m 150 m2 Ø20 m 150 m2 Ø14.3 m

5 TALC Design criteria Solar shield: Goal 30K using radiative cooling 350K 80K 20K - Change of temperature of 5 layers of alumined Kapton After 30 hours exposed to sun and rear side exposed to dark - The telescope is protected from sun radiation ; we expect a final temperature of 30K obtained by passive cooling of the pannels.

6 M2 Focus

7 Launch of TALC with A6 + Electric module 02/11/2016 Gilles Durand 7

8 TALC Design criteria TALC, Thin Aperture Light Collector

9 TALC mission Roadmap Our roadmap shall be to match the SSC recommendation with the following approach: 1. Gather a scientific community from multi-national contributors that have experience and interest in the post-herschel / ALMA / JWST era 2. Identify the key Critical components and take actions to raise them to acceptable level in order to match Cosmic Vision TRL requirements. 3. Consolidate System Engineering at Mission levels through trade off analysis and preliminary design of Mission (Telescope / Instrument / AOCS / Concept of Operation and Ground Segment) to support a future Mission concept costing and proposal. This is the purpose of the TALC H2020 proposal

10 TALC: building architecture blocks Large (20-m) Annular Mirror 1) Deployable of a segmented structure 2) Build mirror segments in series with local optical quality for the µm range 3) Active control in mirrors to reach the global optical shape

11 1) Deployment of a segmented structure

12 1) Deployment of a segmented structure CEA + INSA Lyon + ULB Bruxelles Verification of the kinematic and dynamic behaviour of a structure that deploys using elementary structure of panthograph scissors Principal of the mathematic series Propagation of errors Specification of motorisation until closure of the ring Specifiation of the actuators to adjust the shape using smart structure composites Ferries wheel Stiffness Lightweight

13 1) Deployment of a segmented structure CEA MUAS INAF-BRERA Re-use of an existing test cryostat at CEA Saclay Qualification of reliability and repeatability of the deployment at 80K Optical measurement of a set of the 3 mirrors ø120cm. Qualification of the mirror shape control (real time / Set & forget)

14 1) Deployment of a segmented structure Active damping with Piezo sensor/actuators Simulation of the propagation of vibrations from cryo-coolers and telescope pointing system Active control Verification on the stability of the PSF with / without control Active damping

15 1) Deployment of a segmented structure INSA Lyon ULB Bruxelles Verification on a ø2m breadboard at ULB Active damping with Piezo sensor/actuators Simulation of the propagation of vibrations from cryo-coolers and telescope pointing system Active control Verification on a ø2m breadboard at ULB Verification on the stability of the PSF with / without control

16 2) Build mirror segments for the 30 µm observation

17 2) Build mirror segments for Media-Lario Multiplast North TPT Pannels built by replica 4.2m * 0.18m Large carbon honeycomb cells/ Thin Ply Technology carbon for stiffness at large scale Thin carbon honeycomb cells / Thin Ply Technology carbon next to reflecting surface All laminates Thin Ply Technology Reflecting surface PITCH carbon fibre very high modulus: 600 GPA Very low CTE Very low CME with cyanate ester Polymerization 70 C + postcure

18 2) Build mirror segments for the 30 µm observation Media-Lario Multiplast North TPT electroformed nickel at the reflecting surface Residual stress and rugosity of the composite structure disappears within the nickel coating Pitch carbon Cyanate-ester Thin Ply Technology electrod-formed Ni 25 µm gold PVD coating Steel mold

19 2) Active control of the mirrors Active Optique Muenster University of Applied Science 3 stages of control Tensioning of the cables Unimorph deformation of primary segments Dedicated deformable mirror in pupil relay Local control of curvature using unimorph principle with piezo sheet Breadbords ø0.3m Breadboard ø1.2m Compare M1 active control versus relay pupil control

20 Frame Work: ESA Cosmic Vision TALC

21 Frame Work: ESA Cosmic Vision L4 L1 L2 L3 M1 M2 M3 M4 M Concept Development Design, Fabrication, Assembly and Test TALC Team Goal: Selection / Approval: 2020/2022 Developement / Implementation 2022 / 2040 Launch 2040 Operations

22 Frame Work: ESA Cosmic Vision L4 L1 L2 L3 M1 M2 M3 M4 M Concept Development Design, Fabrication, Assembly and Test Initial technology development shall be initiated, with a focus on: Lightweight mirrors, Deployable structure Active optics TALC Team Goal: Selection / Approval: 2020/2022 Developement / Implementation 2022 / 2040 Launch 2040 Operations

23 Raising TRL through H2020

24 H2020 Partners European Partners TALC / ELICSIR Commissariat à l'energie Atomique 8% 7% 25% Multiplast North Thin Ply Technology SARL 12% Muenster University of Applied Sciences Media Lario Srl 17% 13% 5% 13% Istituto Nazionale di Astrofisica Université Libre de Bruxelles Institut National des Sciences Appliquées de Lyon Find partners with cutting edge knowledge of key required technological bricks

25