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Status of laser system

Status of laser system. Work since September 2002 Micro-mirror status Mirror support rings status Assembly of laser rods Optics and mechanics on end-plates. TPC meeting, CERN, 17-18 January 2003 Børge Svane Nielsen Niels Bohr Institute. Laser system principle. Micromirror production.

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Status of laser system

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  1. Status of laser system • Work since September 2002 • Micro-mirror status • Mirror support rings status • Assembly of laser rods • Optics and mechanics on end-plates TPC meeting, CERN, 17-18 January 2003 Børge Svane Nielsen Niels Bohr Institute Børge Svane Nielsen, NBI

  2. Laser system principle Børge Svane Nielsen, NBI

  3. Micromirror production All 60 bundles produced and delivered in September 2002, but problems with mirror surface quality and mechanical precision preliminary: 46 accepted based on surface quality most of these will be accepted after being mechanically improved at NBI additional 20 bundles in production in Moscow mechanical reference surface brass cup reflecting surfaces Micromirror bundle Børge Svane Nielsen, NBI

  4. Mirror surfaces (1) Looked at all mirrors in microscope. Example: bundle 18+19 Børge Svane Nielsen, NBI

  5. Mirror surfaces (2) Looked at all mirror reflections after 2.5 m. Example: bundle 18+19 Børge Svane Nielsen, NBI

  6. Mirror surfaces (3) Analysed all mirror reflection profiles after 2.5 m. Example: bundle 18+19 Rejected bad reflections Børge Svane Nielsen, NBI

  7. Mirror reflectances Amplitudes of profiles on previous slide: Acceptance level: 150 (arbitrary units) Preliminary accepted bundles (based on reflectance and image quality): 46 bundles out of 61 received Børge Svane Nielsen, NBI

  8. Angles measurement (1)  and  angles of all micromirror faces measured by goniometer in Moscow  0.0014 (5 arc sec) Børge Svane Nielsen, NBI

  9. Angles measurement (2) • However: • reference surface not good • bundle not fixed to support • in reproducible way • only relative angles any good from this measurement Reference surface has been turned off in NBI workshop to provide good surface Børge Svane Nielsen, NBI

  10. Angle re-calculation Moreover: re-calculation of angles to take into account offset centres of 7 mirrors fail to use actual geometry of each bundle  individual angles not correct Børge Svane Nielsen, NBI

  11. Angles measurement @ NBI All mirror angles have been re-measured at NBI, using laser beam setup-up. Check measurement in progress Estimated precision:  0.5 mrad (2 arc min)  0.5 mrad (2 arc min) Børge Svane Nielsen, NBI

  12. Angles measurements Mean = -0.08 Sigma = 0.51 Mean = -0.29 Sigma = 0.94 Børge Svane Nielsen, NBI

  13. Linear measurements Mean = -0.23 mm Sigma = 0.57 mm L Børge Svane Nielsen, NBI

  14. Mirror support rings NBI workshop: 50 mirror support rings ready All rings produced at NBI Børge Svane Nielsen, NBI

  15. Micromirror positions Micromirror positions as seen by laser beam: Near end-plates Near central electrode Børge Svane Nielsen, NBI

  16. Micromirror z positions Børge Svane Nielsen, NBI

  17. Rod gluing • Drill holes in short rods • Mount mirror bundles in support rings. • Glue mirror support rings onto short rods. Theta alignment guaranteed by jig + machined surface 4. Glue short rods into full length rods. Phi alignment adjusted during gluing • Measurements on final rod possible before installation. • Foreseen in February-March. • Details to be discussed next week. Børge Svane Nielsen, NBI

  18. Optics and mechanics on end-plates and laser hut Market survey on optical components for end-plates ongoing Piezo-electric adjustment system from New Focus on order Design in progress on opto-mechanical supports on end-plates: Prism holder: Laser beam Prototypes to be constructed in NBI workshop Børge Svane Nielsen, NBI

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