HYPER Industrial Feasibility Study Final Presentation Optical Bench Activity 3, WP 3200

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1 HYPER Industrial Feasibility Study Final Presentation Optical Bench Activity 3, WP 3200 ESTEC, Noordwijk The Netherlands 6 -th March 2003

2 Introduction 1 - Payload overall Architecture 2 - PST and OB design, materials and mass 3 - Requirements 4 - Analysis: hypothesis, development and results 5 - Results v/s Requirements 6 - Conclusions 2 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

3 Introduction The Optical Bench is the element that joins and gives the position between the HYPER payload functional elements. The following will resume the feasibility study phase evaluations performed to suggest architectural solutions, material and a suitable environment for this unit to comply with its requirements 3 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

4 Payload layout 4 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

5 Payload layout 5 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

6 Payload layout 6 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

7 Payload main dimensions 7 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

8 Bench Modular Architecture 8 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

9 PST Mechanical Architecture 9 6 -th March 2003, ESTEC - Noordwijk, The Netherlands

10 Bench Material Evaluations INVAR: high density and magnetic SiC : relatively high CTE Zerodur : OK for CTE ULE : OK for CTE and Density Invar 36 ULE TM glass Zerodur SiC - density [Kg/dm 3 ] 8,05 2,21 2, CTE, RT [10-6 K -1 ] 1,3 0,08 0,1 2.2 E elastic modulus [GPa] ,3 90,2 420 k thermal conductivity [W/m/K] ,7 1, Specific rigidity (1) [E/ ] 18,38 40,85 35, Thermal stability (2) [k/ ] 7,81 21,25 14, th March 2003, ESTEC - Noordwijk, The Netherlands

11 Mass Budget Precision Star Tracker and Optical Bench Mass Budget Table ASSEMBLY ELEMENT MATERIAL Basic Mass [kg] PST OB Mass + 10 % Uncertainty [kg] Structure ULE Window and Secondary Mirror QUARTZ Baffle CFRP PE Support plate ULE Primary Mirror QUARTZ PE structure Ti6Al4V PE PCB Thermal Plate AA PE PCB columns AA First Inner Baffle AA Second Inner Baffle AA Third inner baffle AA PE PCB Misc Screws & Fasteners Ti6Al4V Total DELTA for Fixing elements Ti6Al4V Mirror (for 6 elements) QUARTZ ASU Housing top ULE ASU Housing side ULE DFS Housing front ULE DFS Housing rear ULE Fiber Injector (for 6 elements) Misc Total OB+PST Total th March 2003, ESTEC - Noordwijk, The Netherlands

12 Requirements th March 2003, ESTEC - Noordwijk, The Netherlands

13 Req. # Requirement Value (3σ) 1 RO-ALN The alignment stability (angular motions) of the first and second G-system with respect to the P-system around transverse axes (PY, PZ, i.e. in the plane perpendicular to PX) shall be better than => in the frequency range between Hz (LT frequency/10) and 0.15 Hz. 2 R1-ALN-02 Alignment accuracy between P-system and O-system around each axis 3 R1-ALN-04 Alignment accuracy between O-system and each G- system around each axis 4 R1-ENL-04 Alignment accuracy of each MX axis with each corresponding FX axis 5 R1-ENL-05 Alignment accuracy of each AX axis with each corresponding MY axis 6 R1-ASU-06 Alignment stability of each MX-axis with respect to the corresponding FX-axis 7 R1-ASU-07 Alignment stability the GY-axis with respect to the AXaxis 8 R1-ASU-08 Relative displacement of each origin M i O of the 3 M- systems along the M i X axes. i = 1,2,3 for both ASUs 9 R1-ASU-09 Alignment stability of the MX axes of each mirror to each other 2.75x10-10 rad/vhz < 30 arcsec < 30 arcsec < 1 arcsec < 1 arcsec < 10-6 rad over ½ orbit < 10-6 rad over ½ orbit < 40 pm over 3 sec < 10-6 rad over ½ orbit th March 2003, ESTEC - Noordwijk, The Netherlands

14 Reference Systems th March 2003, ESTEC - Noordwijk, The Netherlands

15 Analysis: Hypothesis, development and results th March 2003, ESTEC - Noordwijk, The Netherlands

16 Hypothesis on loads Loads on the bench can be mechanical and thermal Mechanical loads are avoided (no moving parts on S/C, compliant mounting) Thermal loads are functional and environmental Functional comes from sustained dissipating elements (e.g. ASUs, DFS, mirrors, etc) The temperature of each unit is homogeneous among its mounting pads (whose temperatures are controlled). Whenever possible, the heat dissipated from each unit is rejected outside the bench, not on unit mounting pads Environmental are from S/C The whole bench is considered radiatively de-coupled from environment (S/C and Cold Space): only conduction from OB mounting pads (whose temperatures are controlled) is considered th March 2003, ESTEC - Noordwijk, The Netherlands

17 Functional Loads ELEMENT Functional Loads On HYPER Optical Bench MAX I/F Temp [ C] Value [W] POWER PEAK Duration Interval [Sec] [Sec] Average [W] NOTES PST N/A PST mass Baffle Free NONE NONE NONE N/A Baffle mass ASU N/A ASU Mass 1 ASU N/A ASU Mass 2 ASU N/A ASU Mass 3 ASU N/A ASU Mass 4 DFS N/A DFS 1 Mass DFS N/A DFS 2 Mass Fiber Injector B-1 Free E E-06 FI back 1 Fiber Injector M-1 Free E E-06 FI middle 1 Fiber Injector F-1 Free E E-06 FI forward 1 Fiber Injector B-2 Free E E-06 FI back 2 Fiber Injector M-2 Free E E-06 FI middle 2 Fiber Injector F-2 Free E E-06 FI forward 2 R.R. Mirror B-1 Free E E-06 Mirror back 1 R.R. Mirror M-1 Free E E-05 Mirror middle 1 R.R. Mirror F-1 Free E E-06 Mirror forward 1 R.R. Mirror B-2 Free E E-06 Mirror back 2 R.R. Mirror M-2 Free E E-05 Mirror middle 2 R.R. Mirror F-2 Free E E-06 Mirror forward th March 2003, ESTEC - Noordwijk, The Netherlands

18 Environmental Loads Description INTERFACE PADS ORBITAL TEMPERATURES T [ C] A B C D E F G H PB PB PF PF Rotating Albedo divided in 8 orbital steps th March 2003, ESTEC - Noordwijk, The Netherlands

19 Optical Bench FEM Interfaces th March 2003, ESTEC - Noordwijk, The Netherlands

20 Load Case H temperature profile results (units in K) th March 2003, ESTEC - Noordwijk, The Netherlands

21 Load Case H displacement profile results (units in mm) Maximum calculated movement: 0.122x10-4 mm th March 2003, ESTEC - Noordwijk, The Netherlands

22 Results v/s Requirements th March 2003, ESTEC - Noordwijk, The Netherlands

23 Results Analysis Methodology Definition of the plane to be investigated (for example the PST primary or MB1 mirror) from the linear co-ordinates of 3 points (A, B, C). Determination of the equation of the plane passing for A, B and C: the reference system x, y, z used is the one used for FE analysis. Determination of the unit vector v orthogonal to. Determination of the angle between two planes and considering the angle between their unit vectors v and v The angular movements have been evaluated for the different reference planes in the same orbital step The linear movements have been evaluated considering the same element for 2 albedo load steps th March 2003, ESTEC - Noordwijk, The Netherlands

24 RO-ALN Requirement Px axis variations with M2-M4 movements PST POINTING ERROR TABLE M2 M4 group Tilt = Shift mm CCD M1-M3 M2-M4 CCD M1-M3 M2-M th March 2003, ESTEC - Noordwijk, The Netherlands

25 OPTICAL BENCH STABILITY REQUIREMENTS VERIFICATION TABLE Requirement Reminder Requested value Calculated Value Notes (3σ) One orbit RO-ALN G1-X V/S PST-X G2-X V/S PST-X < rad x x10-10 About a factor of 2 over the requested value R1-ASU-06 MXi V/S FXi < rad x 10-9 rad Well within requirement R1-ASU-07 GYi V/S AXi < rad x 10-9 rad Well within requirement R1-ASU-08 Displacement MOi < 40 pm/3sec pm/3sec Well within requirement R1-ASU-09 MXi V/S MXj < rad x 10-9 rad Well within requirement Considering the system linear response respect the environmental loads, a reduction of a factor of 2 on the incoming environmental disturbances is reflected in a factor of 2 reduction on output calculated values and the RO-ALN requirement is then accomplished th March 2003, ESTEC - Noordwijk, The Netherlands

26 CONCLUSIONS The developed pre-phase A study has successfully accomplished its duty showing that the very demanding stability requirements could be accomplished by means of: a suitable material for the Optical Bench, such as ULE a suitable thermally stabilized environment th March 2003, ESTEC - Noordwijk, The Netherlands

HYPER Industrial Feasibility Study Final Presentation Precision Star Tracker Activity 3, WP 3100

HYPER Industrial Feasibility Study Final Presentation Precision Star Tracker Activity 3, WP 3100 ESTEC, Noordwijk The Netherlands 6 -th March 2003 Agenda Introduction 1 PST Requirements 2 PST CCD Characteristics