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

2. 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

3. Entrance Pupil with Payload and Optical Clocking Marks 3

4. 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.

5. Individual FOV & Entrance Pupil Projection 5

6. Entrance/Exit Pupil Simultaneous View 6

7. WFC Stop, Exit Pupil & FPA Axis Orientations 7 Something

8. Shortwave vs. Longwave Pupil Masks Longwave Filters H158 (1.380 - 1.774) F184 (1.683 - 2.000) W149 (0.927 - 2.000) GRS (1.350 - 1.950) – Require Lyot Stop – Stop is shaped to block emissions of all telescope structures for all fields – Vignetting of outer aperture Shortwave Filters Z087 (0.760 - 0.977) Y106 (0.927 - 1.192) J129 (1.131 - 1.454) – 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

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

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

11. Integral Field Unit Pupil Mask 11

12. IFU Image Slicer Exit Pupil Detail 12

13. IFU Intermediate & Exit Pupil Orientation 13 Spectrograph Pupil Relay

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

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

16. 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 150428.xlsx – AFTA C5 PSF-Zernike Cross-Check 150630.ppt – AFTA C5 IFU PSF Samples 150630.xlsx – AFTA C5 IFU Zernike Data 150630.xlsx 16