1. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 1 Long Wire Measurement System Georg Gassner, SLAC July, 2007 Introduction Principle Long Wire Introduction Principle Long Wire

2. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 2 Long Wire Measurement System Purpose Connecting different parts of a network together (in x - direction) Purpose Connecting different parts of a network together (in x - direction)

3. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 3 Long Wire Measurement System Principle Positioning of a platform relative to a wire at different locations Connecting the network with the wire -> Laser tracker Realization Positioning capabilities x- y translation -> one laser position in x and y each Pitch, roll and yaw -> second laser position in x and y each plus bubble level for roll Principle Positioning of a platform relative to a wire at different locations Connecting the network with the wire -> Laser tracker Realization Positioning capabilities x- y translation -> one laser position in x and y each Pitch, roll and yaw -> second laser position in x and y each plus bubble level for roll

4. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 4 Scan of Wire Along the X- Axis Scan of a 0.4mm diameter green monofilament wire (blackened) Problem found here: ambient light influences reading -> measurements on Both sides of the wire Scan of a 0.4mm diameter green monofilament wire (blackened) Problem found here: ambient light influences reading -> measurements on Both sides of the wire

5. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 5 Scan of Wire Along the X- Axis Scan of a 0.8 mm fishing line (pink)

6. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 6 Long Wire Problem with long wire is the exposure of the wire to airflow, this results in vibration of the wire (Experiment in the gallery with a 250m wire resulted in vibrations with an amplitude of > 100 micrometers) -> Solution is to surround the wire with plastic sheets Problem with long wire is the exposure of the wire to airflow, this results in vibration of the wire (Experiment in the gallery with a 250m wire resulted in vibrations with an amplitude of > 100 micrometers) -> Solution is to surround the wire with plastic sheets

7. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 7 Kink in the wire (1) To determine the existence of kinks in the wire two parallel wires were stretched over a distance of 80 m

8. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 8 Kink in the wire (2) To determine the existence of kinks in the wire two parallel wires were stretched over a distance of 80 m. In the ideal case this would result in a straight line.

9. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 9 Electro static charge No measurable deflection of the wire by charging the plastic cover Charged Plexiglas rod, 20 mm from line-> 20 micrometers Effect of plastic sheets expected to be 25-100 times smaller Precaution steps: Increasing the humidity ->spraying water on plastic No measurable deflection of the wire by charging the plastic cover Charged Plexiglas rod, 20 mm from line-> 20 micrometers Effect of plastic sheets expected to be 25-100 times smaller Precaution steps: Increasing the humidity ->spraying water on plastic

10. July 19, 2007 Internal Presentation Georg Gassner gassner@slac.stanford.edu 10 End of Presentation