WFIRST-AFTA Exit Pupil Masks (Cycle 5) for the Wide Field Instrument Bert Pasquale Cathy Marx June 30, 2015

Exit Pupil Masks Overview Purpose: Provide Science Team with Normalized Exit Pupil Masks to apply to WFIRST-AFTA wavefront data Wavefront Maps and Pupil Masks are provided for each WFIRST-AFTA Cycle 5 Optical Channels: – WFC (Wide Field Channel): WIM & WSM Longwave (Thermal) – Uses Pupil Mask (Lyot Stop) Shortwave (Non-Thermal, < ~1.6µm) - Uses only Telescope Structure – IFU (Integral Field Channel) Image slicer Image Final Sensor Image Wavefronts are given in Zernike sets (See appendix) Pupil Masks are given as High-Resolution (~2k x 2k pixels) image files with lossless compression (TIFF) Wavefront Pupil (Circle Unit 1) Overlays with Mask (Square Unit 1) 2

Entrance Pupil with Payload and Optical Clocking Marks 3

Entrance Pupil and FOV Axis Orientation 4 Note: WFI “Optical FOV” Axes are in angular space, and appear flipped when overlaid with the Entrance Pupil’s projected local X/Y Axes They require a 150° rotation to transform FOV.

Individual FOV & Entrance Pupil Projection 5

Entrance/Exit Pupil Simultaneous View 6

WFC Stop, Exit Pupil & FPA Axis Orientations 7 Something

Shortwave vs. Longwave Pupil Masks Longwave Filters H158 ( ) F184 ( ) W149 ( ) GRS ( ) – Require Lyot Stop – Stop is shaped to block emissions of all telescope structures for all fields – Vignetting of outer aperture Shortwave Filters Z087 ( ) Y106 ( ) J129 ( ) – Does not require Lyot Stop (but can be used if desired for pupil continuity) – Mask includes only telescope struts and COBS (No aperture vignetting) 8

Wide Field Channel Normalized Pupil Masks 9 AFTA WFC C5 Exit Pupil Mask Norm.tif – Lyot Projection, Some Vignetting

Wide Field Channel Shortwave Pupil Masks 10 AFTA WFC C5 Exit Pupil Shortwave Norm.tif – Telescope Structure, No Vignetting

Integral Field Unit Pupil Mask 11

IFU Image Slicer Exit Pupil Detail 12

IFU Intermediate & Exit Pupil Orientation 13 Spectrograph Pupil Relay

(Back) IFU Sensor & Pupil Orientation 14 Flipped to Match X/Y Axis

IFU Image Slicer and Sensor Normalized Pupil Mask 15 AFTA IFU C5 Exit Pupil Norm.tif – Lyot Projection, Some vignetting Same Mask: Slicer & Pupil

Pupil Summary The following WFIRST-AFTA Cycle 5 Wide Field Instrument Exit Pupil Masks have been produced with correct alignment and normalization to the Wavefront Data. – AFTA WFC C5 Exit Pupil Mask Norm.tif – AFTA WFC C5 Exit Pupil Shortwave Norm.tif (No vignetting, Tel structure only) – AFTA IFU C5 Exit Pupil Norm.tif (Applies to both Slicer and Sensor Exit Pupils) Wavefront Data Files (See File: AFTA Zernike Coefficients Use.docx) – AFTA C5 WFC Zernike and Field Data xlsx – AFTA C5 PSF-Zernike Cross-Check ppt – AFTA C5 IFU PSF Samples xlsx – AFTA C5 IFU Zernike Data xlsx 16