Improvement of a wiggler by single axis magnetic measurement, virtual synthesis, and relocation of magnets

H. S. Marks, M. Volshonok, E. Dyunin, A. Gover, Y. Lasser, R. Shershevski, A. Yahalom

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

Deviations in the electron beam trajectory through the planar wiggler of the Israeli Electrostatic Accelerator FEL were found to be primarily caused by small variations in the strength and angle of polarisation of lateral focussing bar magnets which are positioned on both sides of the wiggler, and provide a quadrupole guiding field on axis. The field of the wiggler on axis was measured using a Labview controlled automated system built in our lab, based on a 2-axis Hall Effect magnetic sensor driven by a stepper motor. Polarisation field components of the individual focussing magnets were measured separately. Then, using an algorithm, the focussing magnets were paired, such that their non-uniformities were utilised to not only cancel out each other's error, but also to cancel out the field errors on axis due to variation in strength and polarisation angle of the wiggler magnets. The quality of the predicted electron beam transport was evaluated by 3-D simulation with the General Particle Tracer code which allowed the input of all the measured fields.

Original languageEnglish
Pages513-516
Number of pages4
StatePublished - 2009
Event31st International Free Electron Laser Conference, FEL 2009 - Liverpool, United Kingdom
Duration: 23 Aug 200928 Aug 2009

Conference

Conference31st International Free Electron Laser Conference, FEL 2009
Country/TerritoryUnited Kingdom
CityLiverpool
Period23/08/0928/08/09

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