1A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva High-accuracy goniometer for channeling experiments A. Carnera, G. Della Mea, D. De Salvador, R. Milan, A. Sambo, A. Vomiero and the H8-RD22 Collaboration

2A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Outline Goniometer requirements Goniometer requirements Design, set-up, off line characterisation Design, set-up, off line characterisation Application in the H8-RD22 experiment (September 2006) Application in the H8-RD22 experiment (September 2006) Cradle-like system for axial channelling Cradle-like system for axial channelling Installation in high vacuum environment Installation in high vacuum environment Conclusions Conclusions

3A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Expected physical parameters  bending ~ 160  rad  C ~ 14  rad  VR ~ 14  rad

4A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Goniometer requirements Minimum step ~   rad High accuracy (~   rad) High repeatability (~   rad) 2 Crystals hosting Wide translation range for off-axis positioning of crystals with respect to beam line

5A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Conceptual design (March H8-RD22 CERN meeting) Rotation axis of the goniometer Crystal holder Linear stage to put the crystal holder on rotational axis of the goniometer Linear stage goniometer on/off the beam Rotational stage for the alignement of the crystal with the beam (planar channeling)

6A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Granite platform (1)

7A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Granite platform (2)

8A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Linear stage PLS85 (Micos) Bidirectional Repeatability: 2  m Travel: 102 mm Rotational stage PRS85 (Micos) Bidirectional Repeatability: 1  rad Travel: 360° (Closed loop encoder-based) Linear stage LS110 (Micos) Bidirectional Repeatability: 2  m Travel: 50 mm Goniometer design

9A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Off-line calibration (1) Movement around 180° at ±1 μrad step

10A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Movement around 180° at ±17 μrad step The repeatability is within 0.5 μrad Off-line calibration (2)

11A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Movement at +1 μrad steps, than homing after 10 steps Repeatability is within 1 μrad Off-line calibration (3)

12A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Accuracy – wide range ~9  rad

13A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Goniometer in H8 area (September 2006)

14A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva The main result The goniometer succeeded

15A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Cradle-like system (Closed loop encoder-based)

16A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Up grade of the goniometer Cradle-likesecond rotary stage (x-rotation) Cradle-like second rotary stage (x-rotation)

17A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Up grade of the goniometer Cradle-likesecond rotary stage (x-rotation) Cradle-like second rotary stage (x-rotation)

18A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Up grade of the goniometer Cradle-likesecond rotary stage (x-rotation) Cradle-like second rotary stage (x-rotation)

19A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Up grade of the goniometer Cradle-likesecond rotary stage (x-rotation) Cradle-like second rotary stage (x-rotation)

20A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva The goniometer with Cradle-like system (March 2007 INFN-LNF)

21A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva

22A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva ±100 µrad Interferometric measurement (2)

23A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva UHV set-up UHV mbar (baking needed) Precision Rotation Stage 1Vpp encoder for UHV environment, Phytron UHV motor, UHV Cryo limit switches, Braycode 601 lubricant, Kapton insulated wires

24A. Vomiero Crystal Channeling for Large Colliders: Machine and Physics Applications March 2007, CERN Geneva Conclusions Set-up of high precision / accuracy / repeatability goniometer Application of goniometer succeeded during the H8-RD22 run (September 2006) Cradle-like system designed and set-up (test in March BTF of INFN-LNL) UHV compatible goniometer can be delivered at the same conditions of precision / accuracy / repeatability