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MRO FTT/NAS & FLC

FTT/NAS Requirements Compliance Matrix MRO-TRE-CAM-0000-0104

The Cambridge FTT Team

rev 1.0 31 August 2010

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


MRO-TRE-CAM-0000-0104

Page 2 of 5

Change Record
Revision 0.1 0.2 1.0 Date 2010-08-27 2010-08-27 2010-08-31 Author(s) JSY JSY JSY Initial version Edits from discussion with CAH, MF More references to CoDR report, minor edits Changes

Objective
To present the compliance status of the FTT/NAS conceptual design.

Scope
This document presents the Cambridge FTT team's assessment of whether the conceptual design for the FTT/NAS described in RD2 satisfies the top-level requirements specified by MRO in RD1.

Reference Documents
RD1 Technical Requirements: Fast Tip-Tilt/Narrow-field Acquisition System (INT-403-ENG-0003) ­ rev 2.2, May 20th 2010 RD2 FTT/NAS Conceptual Design Report (MRO-TRE-CAM-0000-0102)

Acronyms and Abbreviations
FTT FLC FOV GUI ISS Fast Tip-Tilt First Light Camera Field-of-View Graphical User Interface Interferometer Supervisory System NAS NMT TBC TBD UT Narrow-field Acquisition System New Mexico Tech To be confirmed To be determined Unit Telescope

MROI Magdalena Ridge Observatory Interferometer

1 Compliance Status
Req. No. 1 2 3 4 5 6 7 8 9 Description Status of See design at RD2 CoDR Sec. C C C C C C C C C Implementation note

Mode switching time < 5 s (Goal 1 s) Provision of idle mode Command response (idle mode) Provision of fast tip-tilt mode Estimate image FWHM in fast tiptilt mode at 0.1 Hz Provision of acquisition mode Estimate of image FWHM in acquisition mode Provision of acquisition check mode (Exp. Time 10 s) Provision of dark frame mode

Expect to meet goal of 1 s switching time


MRO-TRE-CAM-0000-0104 Req. No. 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Description Status of See design at RD2 CoDR Sec. C C C C C C C C C C C C C C C C C C C C C C C C C 9.2 9.2 9.2 9.2 9.2 4.1 9.3.1 3 9.3.1 9.3.1

Page 3 of 5 Implementation note

Master dark frame transmission and retrieval Use of dark frame Provision of flatfield mode (Exp. Time 100 s) Master flatfield frame transmission and retrieval Use of flatfield Coordinate transformations Sensor spectral bandwidth: 350­ 1000 nm Space for future dichroic slide Application of dispersion offset Off-axis tip-tilt sensing distance 10 arcseconds Facility for accepting & using offaxis offsets Continuous tracking through offset changes Linearity of centroiding Provision and documentation of API Control of system functions using API Demonstration of GUI(s) Operation of GUI(s) from control room Disabling of GUI controls Operation from laptop Run GUI while streaming to ISS data collector Operation without ISS, FTTA, UTM Stand-alone archiving capability Recording/display of multiple datasets Local storage for detector image data and telemetry 2 GB Stand-alone image recording at user- selectable rate rate of original acquisition Stand-alone telemetry data items

Field rotation limits observation to 300 s in worst case

Will use standalone testing capability provided by MRO ISS interface framework Likely to use local copy of MRO Data Collector

Storage will be available on hard disk of FTT/NAS PC

35

C


MRO-TRE-CAM-0000-0104 Req. No. 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 Description Status of See design at RD2 CoDR Sec. C C C n/a n/a n/a n/a n/a n/a C C C C C C C C C C C C C 7.1.1 6.2.5, 6.5.1 6.2.5, 6.5.1 3 9.2

Page 4 of 5 Implementation note

Stand-alone recording: time-stamps accurate to 1 ms Data transmission to ISS Time-stamps on data transmitted to ISS accurate to 1 ms Reduced-data-rate low-latency (0.2 s) transmission to ISS Sub-sampling for reduced data rate (at 10 Hz) Reduced-data-rate telemetry items to ISS Full-data-rate high-latency (300 s) transmission to ISS Reliable protocol for full-data-rate transmission to ISS Full-data-rate telemetry items to ISS Alternative: Full-data-rate lowlatency (0.2 s) transmission to ISS Fast tip-tilt mode FOV 3 в 3 Closed-loop 3dB bandwidth: 10­ 40 Hz (Goal 1­50 Hz) Sinusoidal dither facility: 2 at up to 10 Hz Latency of dither function 1 ms Acquisition mode FOV 60 в 60 (Goal 100 в100) Selection of (tip-tilt) reference object Facility to override reference object selection Relocation procedure Provision of relocation hardware Withstanding shock-loads of X g Relocation time 2 hrs Environmental conditions for operation: Electronics housing temp in range +10 to +40 °C, ambient temperature in range -5 to +20 °C, ambient relative humidity in range 10% to 70%

Will comply with alternative requirement 45 " " Will comply with alternative requirement 45 " "

FOV will be in range 77 to 102 depending on final choice of pixel scale


MRO-TRE-CAM-0000-0104 Req. No. 58 Description Status of See design at RD2 CoDR Sec. C 7.1

Page 5 of 5 Implementation note

Environmental conditions for survivability: ambient temperature in range -25 to +40 °C, ambient relative humidity in range 5% to 95% Dichroic clear aperture 110 mm Dichroic throughput 97% Dichroic diattenuation 1% Dichroic surface quality: 60:40 or better Dichroic transmitted WFE 16.4 nm Limiting magnitude for acquisition V = 16 Residual tip-tilt in fast tip-tilt mode 0.060 at V = 16 or brighter Stability of tip-tilt zero-point: 0.015 for T 5 °C Use of electronics housing Surface temp close to beam path within 2°C of ambient Total power consumption 250 W Routine maintenance interval 3 months Design lifetime of 10 years Provision of maintenance plan for control system software & hardware Provision of list of ICDs and enumeration of authors Compatibility with agreed space envelope

59 60 61 62 63 64 65

C C C C C C MC 2 Less demanding than 65 Tip-tilt residual exceeds requirement by 2%; equivalently residual requirement met at V = 15.8 Compliant subject to factor 2 uncertainty in our initial analyses. Will be further assessed by prototyping in PDR phase 4.3.2

66

CE

6.2

67 68 69 70 71 72

C C C C C C

8 7.1.1 7.1.2

10 Source code will be supplied. Bugfixes will be made subject to staff availability 11 4.2

73 74

C C

Key
C Compliant CE Compliance Expected (to be confirmed at PDR) MC Marginally Compliant PC Partially Compliant NC Not Compliant n/a Not applicable