1. PACS IBDR 27/28 February 2002 PACS Grating Assembly1 Grating Assembly E. Renotte Centre Spatial de Liège (B)

2. PACS IBDR 27/28 February 2002 PACS Grating Assembly2 Content design status test results expected performances, budgets procurement, manufacturing & AIV plan schedule milestones product assurance problems areas & critical items

3. PACS IBDR 27/28 February 2002 PACS Grating Assembly3 Design Status ICDs nearly complete Sub-contractor selected 05/2001 (*), PDR 09/2001 Mechanical assembly drawing completed Main changes since IIDR :- bearings geometry / mounting - two resolvers - actuator upgraded - launch-lock re-designed All mechanism components selected Structural analysis 75% completed (CDR planned 03/2002) (*) diffraction grating, actuator, resolver and bearings procured by CSL.

4. PACS IBDR 27/28 February 2002 PACS Grating Assembly4 Design Status - Layout (1)

5. PACS IBDR 27/28 February 2002 PACS Grating Assembly5 Design Status - Layout (2)

6. PACS IBDR 27/28 February 2002 PACS Grating Assembly6 Preliminary Test Results - Mechanism Control Steps of 0°00’18” :Balistic trajectory of ±4° : Overshoot :< 3” Stabilisation :~32 ms Repeatability :~1.25” rms (18”-step) Readout error :~0.75” rms (18”-step) Max. error :36” (calibration needed)

7. PACS IBDR 27/28 February 2002 PACS Grating Assembly7 Preliminary Test Results - Diffraction Grating Roughness (Wyko) PV :1.75..3.00 µm (34.5°) 2.3 µm (62.4°) rms :0.16..0.21 µm (34.5°) 0.12 µm (62.4°) Pending… - Moiré test (periodicity) - interferometric test 80 x 100mm² samplegrooves Bump ! Groove profile (“needle” machine)

8. PACS IBDR 27/28 February 2002 PACS Grating Assembly8 Performances & Budgets Optical Spec.Actual period8.5±.05 mm -1 8.46(m) facet± 1° periodicity± 0.3 µ rms?(p) parallelism± 10”~(e) depth± 2 µ~(m) planeity3 µ rms?pend. roughnessno spec0.2 µ rms(m) Mechanical Spec.Actual mass3 kg~3.7 kg(c) stiffness> 200 Hz (c) Functional jitter<.1”/  Hz?(p) -switching3’ / 3Hz (e) resolution< 3” 1.25”(m) stabilisation< 32 ms (m) Operational lifetime4.5 yearlifetest(p) Environmental temperature3..20K (m) dissipation4+1 mW?(p) cool-down< 1 day (m) Legend : (e)estimated (c)calculated (m)measured/tested (p)pending

9. PACS IBDR 27/28 February 2002 PACS Grating Assembly9 Procurement & Manufacturing

10. PACS IBDR 27/28 February 2002 PACS Grating Assembly10 Manufacturing & AIV Plan

11. PACS IBDR 27/28 February 2002 PACS Grating Assembly11 Schedule Milestones

12. PACS IBDR 27/28 February 2002 PACS Grating Assembly12 Product Assurance Implementation of Project PA Plans (see PACS-CL-PL-008) Implementation of Procedures & Standards Configuration Control Interface control Safety Traceability of materials, parts and processes Reliability of materials, parts, structures... Cleanliness control Qualification/Acceptance of products

13. PACS IBDR 27/28 February 2002 PACS Grating Assembly13 Problem Areas / Critical Items Two unavoidable SPF : - bearings - launch-lock mechanism  reliability to be validated by lifetest Fabrication of diffraction grating not confirmed to specs  manufacturer selected after sample evaluation + possible other suppliers (for PFM) Possible late delivery of CQM bearings (still on schedule)  active follow-up + other suppliers contacted