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Status of laser system

Status of laser system. Effect of laser on mylar foil Design details frozen since May Micro-mirror status Mirror support rings status Assembly of laser rods Optics and mechanics on end-plates. TPC meeting, Copenhagen, 2-3 September 2002 Børge Svane Nielsen, Jørn Westergaard

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Status of laser system

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  1. Status of laser system • Effect of laser on mylar foil • Design details frozen since May • Micro-mirror status • Mirror support rings status • Assembly of laser rods • Optics and mechanics on end-plates TPC meeting, Copenhagen, 2-3 September 2002 Børge Svane Nielsen, Jørn Westergaard Niels Bohr Institute Børge Svane Nielsen, NBI

  2. Laser beams hitting mylar strips in TPC TB: What is the effect on the mylar strips from the laser beams? mylar strips Børge Svane Nielsen, NBI

  3. Preliminary tests • We use aluminized mylar strip received from CERN • Shoot on strip with laser beam reflected from a micromirror ( 1 mm) • Preliminary results from last week: • 300-370 J/pulse 1 mm through-going hole after 15 minutes! • 150-200 J/pulse small damage after 6 hours • 100-150 J/pulse no visible damage after 6-7 hours Design power is 20 J/pulse, well below the tested values. We believe that the damage is due to melting of the Al layer. Plan more systematic tests over longer time, but hard to do longer than  1 week. Børge Svane Nielsen, NBI

  4. Status of laser system • Effect of laser on mylar foil • Design details frozen since May • Micro-mirror status • Mirror support rings status • Assembly of laser rods • Optics and mechanics on end-plates TPC meeting, Copenhagen, 2-3 September 2002 Børge Svane Nielsen, Jørn Westergaard Niels Bohr Institute Børge Svane Nielsen, NBI

  5. Rod numbering Børge Svane Nielsen, NBI

  6. Micromirror z positions Børge Svane Nielsen, NBI

  7. Muon arm side beam transport limited space between TPC and space frame  move beam transport 10º from vertical plane adds 2 mirrors on shaft side + modifies beam transport on muon side Shaft side ”standard” prism ”knee” in beam transport on shaft side Muon side special prism hope to attach 50 mm pipe on outside of TPC permanently Børge Svane Nielsen, NBI

  8. Micromirror production A.Ridiger, Moscow: all 60 bundles produced all angle measurements done report received, delivery imminent micro-mirror bundle brass cup protection cap Børge Svane Nielsen, NBI

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

  10. Ideal laser tracks in TPC Børge Svane Nielsen, NBI

  11.  angle measurements Mean = 0.111 Sigma = 0.190 Mean = 0.033 Sigma = 0.229 Børge Svane Nielsen, NBI

  12.  angle measurements Ideal angle = 45º Mean = -0.048 Sigma = 0.073 Børge Svane Nielsen, NBI

  13. Linear measurements L Top mirrors Mean = 6.24 mm Sigma = 0.27 mm Middle mirrors Mean = 4.75 mm Sigma = 0.35 mm Bottom mirrors Mean = 3.25 mm Sigma = 0.35 mm Børge Svane Nielsen, NBI

  14. Laser rod with mirrors Børge Svane Nielsen, NBI

  15. Mirror support rings NBI workshop: 50 mirror support rings in production Prototype produced at NBI Børge Svane Nielsen, NBI

  16. Rod gluing Two stage gluing procedure at CERN: 1. Mirror support rings glued to short rods. Theta alignment guaranteed by jig 2. Full length rod glued from short rods. Phi alignment adjusted during gluing Measurements on final rod possible before installation. Børge Svane Nielsen, NBI

  17. Optics and mechanics on end-plates Market survey on optical components for end-plates imminent Design in progress on opto-mechanical supports on end-plates Prism holder: Laser beam Prototype to be constructed in NBI workshop soon Børge Svane Nielsen, NBI

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