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Spectrograph Shutter Mechanism for Cassegrain Focus

Explore the design of a spectrograph shutter system mounted at Cassegrain focus, featuring motor and shutter dimensions, beam envelopes, and useful light projections.

harryajohnson
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Spectrograph Shutter Mechanism for Cassegrain Focus

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  1. TMA-65 Optics and Beam geometry Mike, This is a first Pass workup of your concept for a Spectrograph shutter mechanism mounted at the Cassegrain focus. Cass Shutter exemplar. (This one is “FlatCass-01”) TMA-65 Focal Plane layout. ( “DetectorModules4316x45” ) Robin Lafever LBNL

  2. TMA-65 Ray traces and Beam envelopes This shows approximate scale. The motor is 1” dia. The shutter is ~3” dia. It sits at the Cassegrain focal plane Cassegrain focus TMA-65 Focal Plane layout. ( ‘DetectorModules4316x45’ ) Robin Lafever LBNL

  3. TMA-65 Ray traces This shows approximate scale. The motor is 1” dia. The shutter is ~3” dia. It sits at the Cassegrain focal plane Cassegrain focus TMA-65 Focal Plane layout. ( ‘DetectorModules4316x45’ ) Robin Lafever LBNL

  4. TMA-65 Scientifically useful light envelope. Cassegrain Focal plane mask Is very nearly a spherical surface TMA-65 Focal Plane layout. ( ‘DetectorModules4316x45’ ) Robin Lafever LBNL

  5. Scientifically useable light projected through the Cass mask The lower surface of the mask is at the Cassegrain focus ( two possible configurations ) Spectrograph shutter assembly embedded in the Cass focus Robin Lafever LBNL

  6. Some of the foreground beam envelopes have been removed to show the shutter assembly position at the Cass focus. In this configuration, the shutter blade is at the Cass focus. Spectrograph beam envelope Robin Lafever LBNL

  7. Here, a ‘Flat’ mask has been superimposed onto the ‘Spherical’ mask. The ‘Flat’ cutouts have been optimized to provide knife-edge masks at the innermost corners Spectrograph beam envelope Robin Lafever LBNL

  8. An alternate configuration using the ‘Flat’ Cass mask. Here, the shutter blade is above the Cass focus and, The Cass focus is below the ‘Flat’ mask. Spectrograph beam envelope Robin Lafever LBNL

  9. Some of the foreground beam envelopes have been removed to show the shutter assembly position at the Cass focus. In this configuration, the shutter blade is above the Cass focus. Spectrograph beam envelope Robin Lafever LBNL

  10. Spectrograph shutter in open position Incoming Spectrograph beam envelope ‘Flat’ Cass shutter blades in closed position Robin Lafever LBNL

  11. The shutter mechanism Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Mounting frame Outgoing Spectrograph beam envelope Robin Lafever LBNL

  12. The shutter mechanism Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Mounting frame Outgoing Spectrograph beam envelope Robin Lafever LBNL

  13. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is OPEN Mounting frame Outgoing Spectrograph beam envelope Robin Lafever LBNL

  14. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is CLOSED Mounting frame Pretend this is NOT here Robin Lafever LBNL

  15. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is Doing a “Flying Slit” exposure Mounting frame FLASH Robin Lafever LBNL

  16. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is Closed Mounting frame Pretend this is NOT here Robin Lafever LBNL

  17. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is Closed Mounting frame Pretend this is NOT here Robin Lafever LBNL

  18. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is Closed Mounting frame Pretend this is NOT here Robin Lafever LBNL

  19. Incoming Spectrograph beam envelope Eddy current brake Shutter Wheel Motor Shutter is OPEN Mounting frame Outgoing Spectrograph beam envelope Robin Lafever LBNL

  20. Bottom quarterview Back Side Front Side Mike, I can’t find a way to highlight this hyperlink, so I want to make sure you don’t miss it. Try it. You’ll like it ! Robin Top quarterview For an interactive model, go to : //www-eng.lbl.gov/~lafever/SNAP/Robin/Open.htm Robin Lafever LBNL

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