1. 1 SXC on SXG Aim: basic agreement about this SXC on SXG by the end of September (formalities may come later) Clarify key technological items Thermal environment (platform temperature, heating power mirror) Thermal environment (platform temperature, heating power mirror) Mechanical interfaces to satellite (interface in mid-plane or at lower plane) Mechanical interfaces to satellite (interface in mid-plane or at lower plane) Electrical interfaces to the satellite (power switching, databus) Electrical interfaces to the satellite (power switching, databus) Clarify key programmatic items Role of IKI Role of IKI Top level schedule and deliveries Top level schedule and deliveries Project organization (PA/QA, documentation) Project organization (PA/QA, documentation) Funding Funding Next steps (and meetings) Next steps (and meetings)

2. 2 Status at SRON Agreement with management to explore possibility for participation in SXG at a fair level with major tasks: Agreement with management to explore possibility for participation in SXG at a fair level with major tasks: Overall coordination Overall coordination System engineering System engineering Interface with IKI/LA Interface with IKI/LA Telescope assembly (using eROSITA mirrors) Telescope assembly (using eROSITA mirrors) Core team being formed, key people assigned: Core team being formed, key people assigned: Luc Dubbeldam project leader Luc Dubbeldam project leader Cor de Vries: instrument scientist Cor de Vries: instrument scientist Coen van Baren: lead mechanical engineer Coen van Baren: lead mechanical engineer Frans Zwart: lead electronics engineer Frans Zwart: lead electronics engineer Henri Aarts: system engineer/advisor Henri Aarts: system engineer/advisor In addition scientist (Kaastra, in’t Zand) or detector specialists (Takei, Gottardi) will be involved as necessary In addition scientist (Kaastra, in’t Zand) or detector specialists (Takei, Gottardi) will be involved as necessary

3. 3 Activities Update on system overview Update on system overview Inventory of system engineering aspects Inventory of system engineering aspects Preliminary concepts for telescope (tube, TAC) Preliminary concepts for telescope (tube, TAC) Integration and test flow Integration and test flow

4. 4 Overview: WBS

5. 5 Block Diagram

6. 6

7. 7 Budgets Unit Power March Power July Mass March Mass July*) Mirror assembly < 90 (20% margin) 32 (improved modeling, 10% margin) 110-162 139 (15% margin, 60 kg mirror) Detector585831 29 (10% margin) Cooler580 400 (-60) 363 (20% margin) 332 (10% margin) Total ex system margin 728490 504 - 556 500 System margin 20% 5%5%5%5%20%5% total946514 656 - 723 525 *) excludes harness, radiators and support structure for electronic boxes Radiator area needs to be specified (including electronic boxes?)

8. 8 Organization Steering group (den Herder, Mitsuda, McGammon, Kelley, Predehl, Pavlinski) Steering group (den Herder, Mitsuda, McGammon, Kelley, Predehl, Pavlinski) Science team (tbd, larger group) Science team (tbd, larger group) Project management (SRON: PI + project leader)) Project management (SRON: PI + project leader)) Work Package managers (system engineering SRON, detector assembly (xx), mirror assembly (SRON), operations (xx) Work Package managers (system engineering SRON, detector assembly (xx), mirror assembly (SRON), operations (xx) Interfaces with IKI: via SRON system team Interfaces with IKI: via SRON system team Communication between partners within WP (direct, cc system team) Communication between partners within WP (direct, cc system team)

9. 9 Next steps Update SRON-SRG-07-001 using outcome of the meeting Update SRON-SRG-07-001 using outcome of the meeting Agreement on baseline configuration Agreement on baseline configuration another meeting prior to IWG meeting in September to: another meeting prior to IWG meeting in September to: Clarify level of commitment at IWG Clarify level of commitment at IWG Sign off deliverables (authorize SRON-SRG-07-001) Sign off deliverables (authorize SRON-SRG-07-001) Agree on top level schedule Agree on top level schedule Clarify procedures for observing time Clarify procedures for observing time Clarify steps for formal agreement Clarify steps for formal agreement ITAR ITAR