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Méchanic at the CPPM – 07/10/05 Françoise RIVIERE – Jean-Luc GIMENEZ - Pierre KARST

Méchanic at the CPPM – 07/10/05 Françoise RIVIERE – Jean-Luc GIMENEZ - Pierre KARST. IR Detector - Test cryostat : Machining - Positioning in the Herschel cryostat Demonstrator - Overview (new optical scheme) - Mirror and prism supports design - Steering mirror fixation

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Méchanic at the CPPM – 07/10/05 Françoise RIVIERE – Jean-Luc GIMENEZ - Pierre KARST

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  1. Méchanic at the CPPM – 07/10/05 Françoise RIVIERE – Jean-Luc GIMENEZ - Pierre KARST • IR Detector • - Test cryostat : Machining • - Positioning in the Herschel cryostat • Demonstrator • - Overview (new optical scheme) • - Mirror and prism supports design • - Steering mirror fixation • - Detectors fixation • - required information left • Module alignment • - Design status • Some data for the cold test • - Viewport • - Cooling down duration • - New illumination module

  2. Status of the design and the fabrication of the test cryostat • DONE • All the components have been delivered • 3 D design almost achieved (back flange left) • Fabrication = machining (75% done) • TO BE DONE : • - Complete validation of the design = Back flange • - Fabrication = machining + welding + vacuum test + polishing +final vacuum test = delivery in November • - Roughness requirement

  3. COLD TEST IR detector positioning The signal cable has to be in front of the feedthrough.

  4. COLD TEST IR detector positioning Last design : The signal cable is positioned with a angle of 45° with the horizontal axis. In the Herschel cryostat, we should turn the IR detector for keeping the signal cable in front of the feedthrough.

  5. DEMONSTRATOR : Overview Overview in the visible configuration, in respect with the new optical scheme. The baffling and the aperture of the steering mirror have to be designed

  6. Visible detector DEMONSTRATOR : Overview Steering mirror Fixation IR detector Common interface for both detector supports

  7. DEMONSTRATOR : Optic supports Optical components : Rectangular mirror, Zerodur, 310x30x20 Cylindrical mirror, Zerodur,  26 to 34x10 Prism, BK7, Mean thickness 10 mm, 26x26 Support components : Frame and positioning parts, Invar. Clamping and screws : TBD Requirement in the range 300 to 100 K : Positioning tolerance ± 0.1 mm ± 3 arcmin

  8. DEMONSTRATOR : Optic supports Cylindrical mirror Elastic clamping Plan contact with 3 points Mirror support Mirror Centering with 2 small machined plans (depends of the real dimensions of the diameter) Angular support

  9. Angle DEMONSTRATOR : Optic supports Cylindrical mirror

  10. DEMONSTRATOR : Optic supports Cylindrical mirror Springs for the alignment Screws for fixation Stopper The alignment (in translation and tilt) is done with stoppers and shims on the angle support.

  11. DEMONSTRATOR : Optic supports Rectangular mirror Stop Plan contact Orientation Elastic clamping Elastic clamping

  12. DEMONSTRATOR : Optic supports Prism 6 elastic clamps just in front of each pad The positioning is done by 6 small pads on the lower support plate

  13. DEMONSTRATOR : Optic supports Prism Y adjustment Z adjustment The adjustment of the 3 rotation is required : The positioning is done with 3 axis and the adjustment with screws on cantilever. Y Z X X adjustment

  14. DEMONSTRATOR :Steering mirror Preliminary concept STR support Angular support STR support : TA6V Angular support : Invar The contact plan corresponds to the vertex mirror coordinate

  15. DEMONSTRATOR :Visible detector Preliminary concept

  16. DEMONSTRATOR :IR detector Preliminary concept

  17. DEMONSTRATOR : Expected information • Real dimensions of the optics (waiting for the delivery) • Requirement for the aperture in front of the steering mirror • All kind of specification around the optics of the slicer module • (Zerodur support shape, alignment requirement, …)

  18. MODULE ALIGNMENT : General concept Laser adjustment target Illumination with a laser adjusted in the theoretical optical axis. At the entrance focal plan, 2 apertures on the same support (X-Y displacement) At the exit focal plan, on the same support, a target (position) and a razor blade (focal). Laser beam

  19. MODULE ALIGNMENT : Laser module

  20. MODULE ALIGNMENT : Expected information • Definition of the optical target • Orientation of the components • Document of the alignment procedure

  21. COLD TEST : Some data Viewport of the cryostat : Useful width = 40 mm Cooling down duration (300 to 100 K): (Detector and thermal screen are not taken into account) Herschel = 5 kg of aluminium = 10 kg of Invar for thermal point of view = 5h Weight estimation for the demonstrator = 25 kg = 12.5 hours Illumination module : Requirement of the design of a new illumination module with plane and spherical mirrors

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