1. PACS IIDR 01/02 Mar 2001 FPFPU Alignment1 D. Kampf KAYSER-THREDE

2. PACS IIDR 01/02 Mar 2001 FPFPU Alignment2 Subsystem declaration Top Opticscommon entrance optics Photometerred and blue bolometer arrays Slicerslicer and slicer optics Collimatorcollimator mirrors and grating Spectrometer red and blue spectrometer arrays

3. PACS IIDR 01/02 Mar 2001 FPFPU Alignment3 Mechanical Subsystems Top Optics Photometer support, mounted to top optics Bolometer, fixed to bolometer support Collimator, contains collimator, grating, slicer and slicer optics, fixed to top optics and spectrometer Spectrometer, base plate for spectrometer detectors, spectrometer optics and top optics

4. PACS IIDR 01/02 Mar 2001 FPFPU Alignment4 Top Optics 10 mirrors (4 flat) real field stop to real field stop real pupil as aperture stop

5. PACS IIDR 01/02 Mar 2001 FPFPU Alignment5 Top Optics Optomechanical layout entrance compartment up to aperture stop exit compartment up to intermediate focal plane entrance and exit layers are on different mechanical layer no direct straylight path

6. PACS IIDR 01/02 Mar 2001 FPFPU Alignment6 Photometer Red and blue bolometer common Field Mirror Dichroic for beam splitting 7 mirrors (2 flat) pupil stop in front of each bolometer array

7. PACS IIDR 01/02 Mar 2001 FPFPU Alignment7 Photometer

8. PACS IIDR 01/02 Mar 2001 FPFPU Alignment8 Slicer to slicer optics (4 mirrors) slicer (3*5 mirrors) Field mirrors are entrance to collimator

9. PACS IIDR 01/02 Mar 2001 FPFPU Alignment9 Collimator 2 collimator mirrors 1 grating

10. PACS IIDR 01/02 Mar 2001 FPFPU Alignment10 Spectrometer Red and blue spectrometer channel dichroic for channel splitting exit of collimator between periscope 1 & 2 7 mirrors (3 flat)

11. PACS IIDR 01/02 Mar 2001 FPFPU Alignment11 Alignment Task

12. PACS IIDR 01/02 Mar 2001 FPFPU Alignment12 Top optics alignment Collimated laser at centre of telescope secondaryMasks on TROG 1 -3 and FOLD 1

13. PACS IIDR 01/02 Mar 2001 FPFPU Alignment13 Top optics alignment Scatter plate at aperture stop together with CCD for FOLD 1 alignment ( 4 point sources at the edge of the telescope secondary)

14. PACS IIDR 01/02 Mar 2001 FPFPU Alignment14 Top optics alignment Point source array at chopper location and scatter plates with CCD at telescope secondary mirror edge position (alignment of FOLD 2 and FOLD 3)

15. PACS IIDR 01/02 Mar 2001 FPFPU Alignment15 Top optics alignment Point sources at focal plane of top optics. Mask at photometers Field mirror for pupil alignment. Alignment of FOLD 4 and FOLD 5 using scatter plates at secondary mirror

16. PACS IIDR 01/02 Mar 2001 FPFPU Alignment16 Photometer alignment Centering of photometer mirrors using laser beam with predefined path from top optics focal plane and field mirror centre. Position of pupils at the bolometer entrance is predefined (mechanically)

17. PACS IIDR 01/02 Mar 2001 FPFPU Alignment17 Photometer alignment Point sources at the focal plane of the top optics. Check pupil between Dichroic and PERI 1, also at pupil to bolometer array Red channel alignment without dichroic

18. PACS IIDR 01/02 Mar 2001 FPFPU Alignment18 Slicer optics alignment Focus to focus alignment with real pupil between IMAGE 1 and IMAGE 2. Point source array at nominal focalplane of Top optics for realization. Scatter plate at slicer entrance

19. PACS IIDR 01/02 Mar 2001 FPFPU Alignment19 Slicer optics alignment Slicer mirror stacks are prealigned before slicer alignment (laser at translation and rotary stage) Focus to focus alignment with pupil at SLICER REIMAGE

20. PACS IIDR 01/02 Mar 2001 FPFPU Alignment20 Collimator alignment Collimator alignment by means of autocollimation mirror at the grating position Focus to focus alignment. Point source slit arrangement to scatter plate at nominal focus of collimator (with CCD visualisation) Grating alignment by means of rotation and measuring the high orders reflected light in the collimators focal plane (always at the same position, otherwise alignment of the grating)

21. PACS IIDR 01/02 Mar 2001 FPFPU Alignment21 Spectrometer alignment Focus to focus alignment with two stages (intermediate scatter plate between MIRROR 2 & 3) Scatter plate at the detector position, point sources at the nominal focal plane

22. PACS IIDR 01/02 Mar 2001 FPFPU Alignment22 FPU Alignment to Telescope Optical Parameter Primary mirror : radius of curvature:3500 mm conic constant-1.001 Vertex Primary to vertex secondary:1587.97 mm Secondary mirror: Radius of curvature345.26 mm Conic constant-1.292180 Diameter308.32 mm Distance vertex of secondary to focal plane:2637.97 mm Distance focal plane to OB (on axis)202 mm FPFPU FOV0.13569915 deg - 0.18595779 deg. +/- 0.03216578 deg.

23. PACS IIDR 01/02 Mar 2001 FPFPU Alignment23 Optical Tolerances Optimized systemdistorted with random deviations realigned focal position: 8 mm Toleranced mirrors for the blue photometer

24. PACS IIDR 01/02 Mar 2001 FPFPU Alignment24 Optical Tolerances –spherical and toroidal mirrorsradius:+/- 1 % tilt:+/- 0.1 deg. decenter:+/- 1 mm axial shift:+/- 1 mm –off axis aspheres and toroidsradius:+/- 0.5% cc+/- 5% tilt:+/- 0.05 deg. decenter:+/- 0.5 mm axial shift:+/- 0.7 mm –decenter and tilt tolerances appear in combination and will be readjusted. –The alignment procedure will contain a complete tolerancing for each mirror installed. Flat mirrors are not taken into account as they will be used for axis realignment. –No showstopper could be identified.

25. PACS IIDR 01/02 Mar 2001 FPFPU Alignment25 FPU Alignment to Telescope Alignment mirror location (+/- 0.5 mm for feet location and +/- 1 mm for alignment mirrors)

26. PACS IIDR 01/02 Mar 2001 FPFPU Alignment26 AKF position for FPU alignment at Optical Bench (+/- 1 mm or +/- 2 arcmin) Combined error for position (+/- 2.5 mm) and measurement (+/- 1.5 mm) delta = 5 arcmin (maximum)

27. PACS IIDR 01/02 Mar 2001 FPFPU Alignment27 OGSE