1. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper R. Hofferbert D. Lemke, U. Grözinger, O. Krause, U. Klaas J. Katzer (ZEISS) Max-Planck-Institut für Astronomie, Heidelberg

2. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Overview Lifetime Model LM Tests New Schedule Open Points Conclusion

3. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Lifetime Model LM manufacture started Nov 2000 at MPIA, drawings from Zeiss Assembly planned for Mar/Apr 2001 at Zeiss Design frozen

4. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Chopper Overview Fully manufactured at MPIA mechanical workshop (A. Böhm and co-workers) housing mirror drive unit with 3 coils position sensor unit flexible pivot temperature sensor I/F point pigtail with I/F connector

5. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Rotor Al 6061 12g, 3.23x10 -7 kgm 2 integrated lightweight mirror sensor magnet drive magnets balancing masses

6. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Flexural Pivots CuBe, double-stage  12° 5Nmm/rad

7. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper New Schedule

8. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Work to do Consider FPU structural analysis (KT) with respect to vibration loads for the chopper Implementation of “PACS black color” for the chopper –First test on LM spare cover –Qualification for QM, FM, FS (MPE) Formal agreement with MPE for proposed QM/FM test procedures (#axes, temperature level)

9. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper Conclusion Features of promising MPIA prototype nearly fully adopted in Chopper design of Zeiss Specs to be achieved Optimized choice of materials, dimensions, linkage to be verified in LM and QM tests industrial QA guarantees outcome of a space qualified system Interface to warm electronics nearly specified minor effort to fix cable routing and launch lock details Start of cold lifetime tests in June 2001 QM to be delivered in October 2001 internalexternal

10. PACS IIDR, Noordwijk 1-2 Mar 2001 Chopper LM Tests MPIA 