Overall Technical Status

Transcription

1 NOMAD Science Working Team meeting 4 Overall Technical Status ESA/ESRIN, September

2 Overview General status & Overview Optical design Mechanical design Electronic design Firmware/Software Breadboards LNO UVIS Challenges 2

3 PDR closure General Status Most major topics closed Reliability documents to be finalized E-ICD signature Interface agreements reached in last weeks Signature expected 14/09/2012 CDR Designs maturing, but not yet at CDR level 3

4 NOMAD Block Diagram 4

5 General view 5

6 Overview LNO 6

7 Overview SO 7

8 Overview UVIS 8

9 Overview Electronic Section 9

10 Optical Design 10

11 SO & LNO Optical Design: status Optical design frozen LNO SNR remains point of attention UVIS Optical design essentially frozen SNR remains point of attention Temperature of detector: dedicated thermal strap? Stray light subtraction algorithm Simulations in progress 11

12 Optical design: alignment procedure NOMAD contributions to pointing error reduced Special alignment procedure for periscope mirrors at S/C integration facility Detailed pointing budget: 0.58 mrad S/C pointing performance remains fixed at 1 mrad Science need 1.23 mrad max 12

13 Mechanical Design 13

14 3 blade design Mechanical Design - Interface Allows thermal contraction of NOMAD Insensitive to deck deformation 3x3 M8 bolts Interface forces OK Stiffness OK 14

15 Mechanical Design - Structural Design well advanced Major mass reduction achieved: 26.7 kg Within allocation of 28.9 kg Margin too small for comfort Internal structural analysis (subsystems) to be done 15

16 Mechanical Design Optomechanics SO/LNO well advanced LNO grating in progress - manufacturing starts soon UVIS well advanced see OU Periscope design see CSL Second iteration in progress Mass reduction needed Some Interferences to be solved Shift of SO line of sight to be implemented 16

17 Mechanical Design: Radiators Design well advanced Stiffeners cryoradiator determined, to be implemented in design Side wall now does double duty as general radiator Changes probably needed after new thermal analyses 17

18 Mechanical Design: Cryoradiator 18

19 Mechanical Design: Cryoradiator with MLI 19

20 Thermal design 20

21 Thermal design: model Current thermal model predicts: 80 C variation between hot and cold cases Cold case: -60 C predicted / -80 C qualification Too cold for survival! ESA doubts some assumptions made in thermal modelling No transient analysis available Improvements may impact SNR! Biggest technical challenge for NOMAD 21

22 Electronic Design 22

23 Electronic Design: Interface Interface defined and essentially frozen in E-ICD Power Some doubt on consumed survival power Connectors Data volume and rate TC/TM structures 23

24 SO/LNO Electronic design: status Completely heritage - follow up for production UVIS & SINBAD Schematics exist Component selection in progress Layout to be started UVIS: iteration with PCB mechanics in progress Budget partialy approved for long lead components (1 Meuro) 24

25 Electronic Design: Harnessing Subcontractor selected: Glenair Harness definition almost finished Harness routing to be decided 25

26 On board software/firmware design 26

27 On board software/firmware design Instrument Software Model (ISM) delivered in August Flight firmware/software in progress 27

28 LNO Breadboard Assembly and alignment completed June/July Test campaign completed end of August: Room temperature Cold section -80 C Cold section -110 C Room temperature 28

29 LNO Breadboard 29

30 LNO Breadboard 30

31 LNO Breadboard 31

32 LNO Breadboard 32

33 LNO Breadboard Observations Image shift with temperature change of cold section Thermal leak to cold section Noise levels in image not completely as expected Design changes to flight model to be decided asap 33

34 UVIS breadboard Assembly of UVIS breadboard stalled Mirror delivery delayed due to problems with polishing 34

35 Challenges Thermal model & Thermal design Mass Under control, but remains a point of attention Pointing Under control, due to NOMAD efforts No improvement from S/C side Transfer of PCB production to Belgian company: significant schedule and financial risk 35