Tests of Coordinate Transfer from Magnetic to Mechanical Reference for LCLS Undulator Fiducialization

[摘要] Fiducialization of the LCLS undulators will be based on magnetic measurements by Hall probe. Pointed magnets, proposed by I.Vasserman for quadrupole lens fiducialization will be used as an intermediate reference. A prototype of the pointed magnet fixture has been made and tested. In this note we will describe a procedure for measuring the position of the center of the Hall probe sensitive area with respect to the undulator fiducial marks. The pointed magnet calibration procedure, a two-point algorithm for locating the magnetic center of the fixture, and test results are presented.

[发布日期] 2010-12-13 [发布机构] SLAC National Accelerator Laboratory

[关键词] Calibration;Light Sources;Measuring Methods;43 Particle Accelerators;Performance Xfel