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Laser Wire

Detailed review of Laser-Wire lens performance by Myriam Newman at the University of Oxford meeting, focusing on experiment setup, lens design, and future objectives for the Laser-Wire team.

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Laser Wire

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  1. Laser Wire Lens Performance Review Myriam Newman LC-ABD Meeting University of Oxford Thursday, April 13 Laser-Wire Team Members: Grahame Blair, Stewart Takashi Boogert, Alessio Bosco, Laura Corner, Lawrence Deacon, Nicolas Delerue, Brian Foster, David Howell, Pavel Karataev, Armin Reichold, Roman Walczak Laser-Wire

  2. KEK ATF Laser-Wire Interaction Point Smallest Spot Size at KEK ATF Laser-Wire as of March 2007 Laser-Wire

  3. lens How do we use the laser waist to measure the electron beam? Laser-Wire

  4. window Lens Lens Design Lens Type: Doublet of Aspheric and Spheric Triplet Fused Silica System Vacuum Seal Focus 31.2438 mm diameter 5 3 4 2 6 7 60.0700 mm 54.7608 mm 36.7757 mm 24.0757 mm 5.30916 mm 17.9851 mm 12.7 mm Laser-Wire

  5. Lens Study Objectives • Define a metric for how ‘good’ or ‘useable’ the lens is, i.e.: • Define the minimum and maximum tilt in (mrad) for the lens to achieve a 1micron spot size • Determine the angles with which the laser can enter the lens and achieve a 1 micron spot size • Define a translation range for which a 1 micron spot size can be achieved if the laser does not go through the center of lens in (x, y) • Understand the relationship between the spot size, laser waist, and focus position in Z • Understand how the relationship between rotations, translations and how they affect the position of the laser waist, spot size and waist intensity • Develop Alignments Strategy • Use the results to develop future lens designs, simulations, and lens testing procedure Laser-Wire

  6. Experimental Set Up focus Z 0 - + Profiler Window Lens Laser-Wire

  7. Profiler Window Lens Experimental Set-Up Oxford Laser-Wire Lab Laser-Wire

  8. Exaggerated Lens Tilt Animation Double click on the figure to play video clip Laser-Wire

  9. Near Best Focus Best Focus 12/15/06 Laser-Wire

  10. Lens Performance in Tilt (au) Roughly 1.5 mm Laser-Wire

  11. (au) Roughly 4 mm Laser-Wire

  12. Conclusions Understanding the lens behavior provides the following pertinent information: • The relationship between the lens rotation, waist location, and spot size. • How the spot size varies with rotation and shift • Where the waist will be in the chamber in relation to the electron beam in order to compensate with the chamber movers • How sensitive the spot size growth is when the lens is tilted or the laser enters the lens at an angle • A verification and test procedure for testing future lenses that affect future lens design and use • Laser-Wire simulations • Deriving an alignment procedure for setting up the optics in the experiment Laser-Wire

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