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

4. IR detector positioning
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. DEMONSTRATOR : Overview
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. DEMONSTRATOR : Optic supports
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. Real dimensions of the optics (waiting for the delivery)
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
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 adjustment target
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