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Goniometer design and crystal holders

Goniometer design and crystal holders. E. Boscolo Marchi, A. Carnera, G. Della Mea, D. De Salvador R. Milan, A. Sambo, C. Scian, A. Vomiero. Outline. Requirements of goniometer system Goniometer design Capabilities of the goniometer system Suggestions for experimental layout Open questions.

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Goniometer design and crystal holders

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  1. Goniometer design and crystal holders E. Boscolo Marchi,A. Carnera, G. Della Mea, D. De SalvadorR. Milan, A. Sambo, C. Scian, A. Vomiero Crystal Channeling Workshop Geneva 9th - 10th March 2006

  2. Outline • Requirements of goniometer system • Goniometer design • Capabilities of the goniometer system • Suggestions for experimental layout • Open questions Crystal Channeling Workshop Geneva 9th - 10th March 2006

  3. Requirements of goniometer system • Sub m-radiant steps / wide range angular scanning • Top resolution / accuracy / repeatability • Versatility for mounting differently shaped crystal holders / crystals • 2 angular degrees of freedom • 2 translations Crystal Channeling Workshop Geneva 9th - 10th March 2006

  4. Crystal holder Linear stage Goniometer stage Rotary stage Goniometer design Crystal Channeling Workshop Geneva 9th - 10th March 2006

  5. Top view Top view Beam First rotary stage (y-rotation) Beam direction y z x Crystal Channeling Workshop Geneva 9th - 10th March 2006

  6. Technical data of y-rotary stages Full range 360° Resolution ~ 0.35 mrad 0.7 mrad Accuracy ~ 10 mrad 105 mrad Repeatability < 5 mrad 0.7 mrad Crystal Channeling Workshop Geneva 9th - 10th March 2006

  7. Lateral view Lateral view Beam Cradle-likesecond rotary stage (x-rotation) Beam direction x-y intersection y z x Crystal Channeling Workshop Geneva 9th - 10th March 2006

  8. Technical data of the cradle-like rotary stage Full range 20° 10° Resolution ~ 0.065 mrad 1 mrad Accuracy ~ 10 mrad 175mrad Repetibility ~ 0.5 mrad1 mrad Crystal Channeling Workshop Geneva 9th - 10th March 2006

  9. Linear stage Alignement of the crystal with the positioning system Beam direction Linear axis in x direction y z x Crystal Channeling Workshop Geneva 9th - 10th March 2006

  10. Technical data of the linear stage • Full range 25 - 150 mm • Resolution ~ 0.5mm • Accuracy ~ 5 mm • Repeatability ~ 0.5 mm Crystal Channeling Workshop Geneva 9th - 10th March 2006

  11. Crystal positioning and beam deflection Vertical (E853) Crystal insertion Side Up-down Horizontal (RD22) Beam size: is m-beam available? Can we directly detect volume reflection? Crystal Channeling Workshop Geneva 9th - 10th March 2006

  12. The most effective geometry for reducing “septum width” effect “Septum width” (Biryukov 1995,Elsener 1996, Carrigan 2002) effect highly reduced by “etching strategy” proposed by Ferrara Crystalline perfection: low-energy Rutherford backscattering channeling (Baricordi 2005) Beam shape / crystal size and “septum width” Crystal Channeling Workshop Geneva 9th - 10th March 2006

  13. Alignment system (Laser-based, see Elsener 1996) Crystal Channeling Workshop Geneva 9th - 10th March 2006

  14. (courtesy Y. Ivanov) Solution for two crystal holders B A Beam y z x Crystal Channeling Workshop Geneva 9th - 10th March 2006

  15. B A Beam Top view Crystal Channeling Workshop Geneva 9th - 10th March 2006

  16. 50 mm B A Beam Top view Crystal Channeling Workshop Geneva 9th - 10th March 2006

  17. B A Beam Top view Crystal Channeling Workshop Geneva 9th - 10th March 2006

  18. A B Beam Top view Crystal Channeling Workshop Geneva 9th - 10th March 2006

  19. 10 mm A B Beam Top view Crystal Channeling Workshop Geneva 9th - 10th March 2006

  20. Calendar • Goniometer design next week • Alignment system design 1st week April • Software for motor control end of April • Alignment system set-up @LNL May • Goniometer set-up and test @ LNL May Crystal Channeling Workshop Geneva 9th - 10th March 2006

  21. List of the points of detail to be discussed • mechanical mounting of crystal holders on the goniometer (holders suppliers) • simultaneous mounting of two crystals: technically possible, lower versatility, unadvisable from our point of view(all) • movement across the beam (H8) • preliminary off-line alignment of the crystal and design of alignment system (H8 and crystals suppliers) • beam position and on-line crystal alignment (H8 and beam detection) • cabling the remotely controlled motors (H8) Crystal Channeling Workshop Geneva 9th - 10th March 2006

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