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International X-ray Observatory - mission status

International X-ray Observatory - mission status. David Lumb IXO Study Scientist, SRE-SA European Space Agency. Assessment study process at ESA. NASA studies. Independent Mission Design Lab (similar ESA Concurrent Design Facility) for a system study (as if all items US-sourced)

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International X-ray Observatory - mission status

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  1. International X-ray Observatory- mission status David Lumb IXO Study Scientist, SRE-SA European Space Agency

  2. Assessment study process at ESA

  3. NASA studies • Independent Mission Design Lab (similar ESA Concurrent Design Facility) for a system study (as if all items US-sourced) • Reported in submissions to Astro2010 Decadal Survey • Independently costed by Aerospace Corporation • Continued developments in slumped glass optics and microcalorimeter spectrometer

  4. Astro2010 Decadal • Inputs from 2009, based on NASA IMDL and a number of “options” for optics, and programmatic choices etc. • Same company performed costing for the Decadal survey as the NASA IXO assessment, but included $2Bn additional to cover potential “programmatic threats” • Only 4 named programmes in astrophysics. LISA placed ahead of IXO on basis of likely affordability BUT required successful Pathfinder AND a confirmation of ranking in ESA CV • LISA not anticipated before 2025 in this scheme

  5. JAXA Status • The Japanese X-ray community regards the IXO mission as the next major X-ray program in Japan, following ASTRO-H. • Assessment (Phase-A) studies in Japan providing technical support on cryo-chain and deployment module (ASTRO-H heritage) • ISAS has conducted reviews to evaluate the proposal for the participation to IXO since July 2010, under the Steering Committee of Space Science. • Final report was circulated and discussed in the Steering Committee meeting on Jan. 26. • The Committee approves that the IXO team in Japan can join the study activity on IXO during the definition phase, if the IXO mission is approved to proceed to the next phase in the down selection process of the Cosmic Vision.

  6. Mission Overview – later talk by N Rando • Large X-ray observatory (facility class mission, follow up to XMM-Newton & Chandra). • Merger of XEUS (candidate to CV15-25) and Constellation X (candidate to Astro2010). • Single, large aperture telescope, 0.1 to 40 keV. • Large class S/C (10m, 6.5 t), with extendable optical bench to reach a 20m focal length. • LV = Atlas V/551 (or Ariane 5/ECA), large halo orbit at L2. • Nominal lifetime 5 yr, consumables for 10 yr. • Four key elements: Mirror Assembly MA

  7. Mission Overview – later talk by N Rando • Large X-ray observatory (facility class mission, follow up to XMM-Newton & Chandra). • Merger of XEUS (candidate to CV15-25) and Constellation X (candidate to Astro2010). • Single, large aperture telescope, 0.1 to 40 keV. • Large class S/C (10m, 6.5 t), with extendable optical bench to reach a 20m focal length. • LV = Atlas V/551 (or Ariane 5/ECA), large halo orbit at L2. • Nominal lifetime 5 yr, consumables for 10 yr. • Four key elements: Mirror Assembly, Service Module SVM MA

  8. Mission Overview – later talk by N Rando • Large X-ray observatory (facility class mission, follow up to XMM-Newton & Chandra). • Merger of XEUS (candidate to CV15-25) and Constellation X (candidate to Astro2010). • Single, large aperture telescope, 0.1 to 40 keV. • Large class S/C (10m, 6.5 t), with extendable optical bench to reach a 20m focal length. • LV = Atlas V/551 (or Ariane 5/ECA), large halo orbit at L2. • Nominal lifetime 5 yr, consumables for 10 yr. • Four key elements: Mirror Assembly, Service Module, Extendable Optical Bench EOB SVM MA

  9. Mission Overview – later talk by N Rando IM • Large X-ray observatory (facility class mission, follow up to XMM-Newton & Chandra). • Merger of XEUS (candidate to CV15-25) and Constellation X (candidate to Astro2010). • Single, large aperture telescope, 0.1 to 40 keV. • Large class S/C (10m, 6.5 t), with extendable optical bench to reach a 20m focal length. • LV = Atlas V/551 (or Ariane 5/ECA), large halo orbit at L2. • Nominal lifetime 5 yr, consumables for 10 yr. • Four key elements: Mirror Assembly, Service Module, Extendable Optical Bench and Instrument Module. EOB SVM MA

  10. Mirror Assembly Gratings 1.5 m 10 cm Petal Mirror Module 3.2 m IXO optics – see talk M Bavdaz • X-ray telescope, 3m dia with a total effective area > 2.5 m2 (at 1.25 keV). • Angular resolution 5” (at energy < 7 keV). • F = 20m dictated by energy range and effective area. • Two optics technologies are available (system design compatible): • Baseline is Silicon Pore Optics (SPO, Europe). • SPO under development and now at TRL=4. TRL=5 expected by 2011. • Optics mass ~ 650 kg (SPO), located in Mirror Assembly Module. • Back-up is Segmented Glass Optics (SGO, USA & Europe). • Confirmation of optics technology expected by end of 2012.

  11. IXO optics • X-ray tests on Mirror Modules (3 keV). • Stack with 4 pairs as ‘standard candle’ (total of 8 plates). • Fully representative of flight mounting & assembly scheme. • XOU-7 started pre- qualification (used for models validation).

  12. Moving platform XMS WFI + HXI XPOL HTRS The IXO instruments – later talks IXO Model Payload (~ 700 kg, 90 Gbit/day – parallel assessment study): • X-ray Grating Spectrometer (XGS-CAT/OP), CCD focal plane (continuously illuminated via own gratings, at fixed location). - Micro-calorimeter Spectrometer (XMS), TES focal plane • Wide Field Imager (WFI), Si APS focal plane with coaxial Hard X-ray Imager (HXI), Si/CdTe detectors • High Time Resolution Spectrometer (HTRS), SiDD focal plane • X-ray Polarimeter (XPOL), with gas pixel detector.

  13. International cooperation • IXO is an international cooperation program (ESA, JAXA and NASA). • Different scenarios were examined during the assessment study. • Reference scenario put forward to ESA review reflects partnership capabilities and heritage. • SPO technology is baseline (SGO back-up). • Optional scenario with ESA maintaining system level responsibility.

  14. IXO is a Vast Improvement over Existing Missions - P Nandra on science Growing supermassive black holes Strong gravity and large scale structure Missing baryons Growing supermassive black holes 14

  15. Figure of Merit (cf LOFT & Gravitas) • For a timing mission, consider the limit of flux at maximum count rate convolved with energy resolution at 6kev (IXO ~ 10 Crab * 6keV/200eV)

  16. Large Area X-ray Observatory

  17. XEUS & IXO – revision of area • ISS-XEUS 6m2 growing to 30m2 after ISS refit • L2 XEUS ~5m2 proposed to Cosmic Visions (formation flying) • IXO ~3m2 after merging XEUS/Con-X and fixed optical bench • IXO ~2.75m2 after Assessment Study

  18. For this meeting…. • For a long time the high energy astrophysics community has recognised need for large area observatory • The science case(s) should be re-affirmed this week • In the ESA review process, the IXO costing was shown to be consistent with the L class boundary conditions, but …. • The ESA advisory structure is reviewing the 3 L class missions. All 3 have serious problems with the international scenario (Laplace – Planetary Decadal, LISA – Pathfinder delays) • IXO in principle may be well-placed compared with the other missions if we continue to present a coherent case with substantial science case cf. other opportunities

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