1. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI1 Status of laser system TPC meeting, Copenhagen, 2-3 September 2002 Børge Svane Nielsen, Jørn Westergaard Niels Bohr Institute  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

2. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI2 Laser beams hitting mylar strips in TPC mylar strips TB: What is the effect on the mylar strips from the laser beams?

3. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI3 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.

4. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI4 Status of laser system TPC meeting, Copenhagen, 2-3 September 2002 Børge Svane Nielsen, Jørn Westergaard Niels Bohr Institute  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

5. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI5 Rod numbering

6. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI6 Micromirror z positions

7. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI7 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 hope to attach 50 mm pipe on outside of TPC permanently special prism ”knee” in beam transport on shaft side ”standard” prism Muon side Shaft side

8. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI8 Micromirror production A.Ridiger, Moscow: all 60 bundles produced all angle measurements done report received, delivery imminent micro-mirror bundle brass cup protection cap

9. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI9 Micromirror measurements  and  angles of all micromirror faces measured by goniometer in Moscow    0.0014  (5 arc sec)

10. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI10 Ideal laser tracks in TPC

11. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI11  angle measurements Mean = 0.111  Sigma = 0.190  Mean = 0.033  Sigma = 0.229 

12. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI12  angle measurements Ideal angle = 45º Mean = -0.048  Sigma = 0.073 

13. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI13 Linear measurements Top mirrors Mean = 6.24 mm Sigma = 0.27 mm Mean = 4.75 mm Sigma = 0.35 mm Mean = 3.25 mm Sigma = 0.35 mm Middle mirrors Bottom mirrors L

14. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI14 Laser rod with mirrors

15. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI15 Mirror support rings NBI workshop: 50 mirror support rings in production Prototype produced at NBI

16. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI16 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 3.Measurements on final rod possible before installation.

17. TPC meeting, NBI, 2-3 September 2002Børge Svane Nielsen, NBI17 Optics and mechanics on end-plates Design in progress on opto-mechanical supports on end-plates Prism holder: Prototype to be constructed in NBI workshop soon Laser beam Market survey on optical components for end-plates imminent