TIPS/JIM 2008 September 18 The Tunable Filter Imager Passes its CDR[s] 2008 March FGS-TFI/Systems CDR 2008 Sept. 3 FGS-TFI Etalon CDR Alex Fullerton STScI / HIA

TIPS/JIM 2008 September 18

© Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Initial P1 Vibration Test Report Etalon P1 underwent a vibration test on Dec 12 th, 2007 at COM DEV Cambridge. Vibration test report is documented in TRE/CSA/51221/004 The IUT failed during the final Z-axis vibration approximately 3 seconds into the full level shake. The failure occurred at the Baseplate to frame attachment points due to a fracture of the Baseplate. A failure assessment was performed and captured in TNO/CSA/51221/039. FIXED!

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada FGS Optical Assembly – TFI Side

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Fabry-Perot Etalon Optical path difference = 2µl cos  Phase difference = (2  / ) 2µl cos  +  r µ=index of refraction m = 2µl cos  +  r /2  Tuning: For fixed m, on-axis (  =0)  l Detuning: For fixed m, l, off-axis (  )  cos   1   2 /2 Wavelength Transmittance Gap = 2.25 microns

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Capacitance Micrometry

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Mechanical – Etalon Optic Plates Made from Topsil HiTran FZ Silicon per SCD Plates are ground and polished to λ/30 on etalon (interior) face and λ/30 on exterior face. Sensor and track layers are insulated from Si plate material using Si02. Sensor tracks are offset to reduce capacitive coupling outside of sensor zones. Etalon coatings and sensor deposits covered by RQS/CSA/51221/024 Wire Terminals Sensor Pad Multilayer Etalon Coating Top Etalon Plate Bottom Etalon Plate Sensor Track

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Mechanical Components Optic Core Mounting System Restraint System Actuation System Release Bolt Baseplate Bridge Spacer,PZT Actuator and Gap Spacer Etalon Shoulder Screw Load Spreader Washers Mounting Frame Cable Mounting Post PZT Connector Bridge Spacer And PZT Actuator Release Spacer Protective Washer Spring Washer Nut Connector Bracket Etalon Plates Terminal Guide Pin Turret Terminal Cable Mount

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Mechanical – Actuation System Piezo actuators ground and polished to a common height Gap spacers must be ground to suit bottom optic plate thickness in order to achieve design gap. Springs maintain 80N (nominal) preload after release. PFM Piezo Actuators and Gap Spacers will be taped and isolated for launch protection.

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Mechanical – Restraint System Low CTE bolt (Invar) works against high CTE spacers (6061-T651) to release 293K preload at ~100K and provide working clearances at 30K Bridge spacers are diamond point turned to achieve 30 microns of piezo off-load on launch (293K). Top release spacers are pocketed to contain springs from actuation system. Operation verified by test per TRE/CSA/51221/003 Release Bolt

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Mechanical – PZT Wire Routing

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Mechanical – Assembly View But does it work?

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada 3.39  m Laser Interferometry /2  /2 This setup is used in the etalon plate parallelism alignment. The 3.39 mm laser setup uses an infrared He-Ne laser, a beam expander, an F/2, f = 75 mm ZnSe lens and an InSb camera operating between 3 and 5  m. The expanded beam sent through the etalon is transmitted only if the mirror spacing is a multiple of a half wavelength. As a result, an etalon with a wedged gap will transmit parallel lines that are oriented perpendicular to the wedge. The other portions of the beam are reflected back. Making the etalon plates parallel consists in transmitting the whole beam across the full aperture (transmitting the missing portions)  m laser Beam Expander LensEtalon InSb Camera PZT Manual Control 3.39  m Fabry-Perot Setup PZT Control

TIPS/JIM 2008 September 18 Back-Up Material

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Optical Layout of the FGS-TFI 2048  2048 HgCdTe 5.2 micron cut-off 18 micron pixels

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Etalon Coating Design (17 Layers) m = 3m = 1 SHORT 1500 to 2600 nm ~55 filters LONG 3000 to 5000 nm ~51 filters

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Pupil and Filter Wheels FLAT Lamp LINE Lamp Blocking Filters CLEAR Non-Redundant Phase Mask 2008 August

TIPS / JIM 2008 September 18 © Copyright 2008 Her Majesty the Queen in Right of Canada Subject to Controlled Goods Regulations of Canada Key Performance Requirements Parent*TFI Requirement DescriptionRequirement ValueCurrent Design Value FGS-308TFI Channel FOV> 4.7 sq. arcmin4.88 sq. arcmin FGS-638TFI Pixel Size65 mas64.3 to 65.5 mas FGS-306TFI Wavelength Range 1.6 – 2.5  m 3.2 – 4.9  m 1.5 – 2.6  m 3.0 – 5.0  m FGS-311TFI Spectral Resolution> 70 & < to 115 FGS-315Wavelength Shift in FOV< 1.0% (50% of FOV)< 0.3% (complete FOV) FGS-317 TFI Sensitivity at 3.5  m 126 nJy105 nJy FGS-355Coronagraphic Capability2 Pupil masks 2 Lyot occulters 4 Pupil masks 4 Lyot occulters NIRCam bandpass TFI bandpass - Wavelength Selection Flexibility - Good Sensitivity for Emission Line Objects - Emission Line Diagnostic Imaging- Coronagraphy: Extrasolar Planets, Brown Dwarfs