Transcript ppt
Design for a New Optical Table of the Shintake Monitor Takashi Yamanaka The University of Tokyo ATF2 weekly meeting 2007/9/26 Motivations to Design a New Table 1. Widen the range of measurable beam size (for sy) by Increasing number of the laser crossing angles 2. Stabilize the interference fringe position by adding the fringe monitor 3. Increase the signal photons from the collision with electron beam by delivering the laser beam without losing its power Drawing of the Table 174 degree mode IP Laser Splitter Incoming Laser Beam Focusing Lenses 1. Widen the measurable beam size 2 degree 174 30 8 degree degree mode Rotating Mirror Holders Measurable Beam Size 8 degree 2 degree 30 degree 174 degree horizontal axis : electron beam size vertical axis : required measurement resolution 2. Stabilize the interference position IP 30 degree mode Microscope Lens Linear Image Sensor Microscope lens Image sensor Mechanism of Fringe Monitor Magnify the laser beam with microscope lens Calculate the phase from image sensor data using Fourier transform 174 degree mode Second Fringe Monitor First Fringe Monitor Delay Line 3. Increase the signal photons Rotating Mirror Holders Final Focusing Lenses Horizontal Beam Size Measurement Laser Expander Focusing Lens Laser Dump Motorized Scanning Mirror Next Tasks Design has almost done -> Test of optics Basic tests have finished Detailed tasks are remained Forming the interference fringe in a new optics arrangement Considering the alignment strategy Schedule Oct. 2007 Tests of optics Purchase necessary optics ~Oct. 31, 2007 Settle a optical table design Feb. 2008 ~ Install to ATF2 Tests before beam