Adjustment and measurement of a hybrid undulator

Author

Bing, Wu ; Youwu, Ma ; Bo, Lin ; Zhaoming, Zhang

Author_Institution

China Inst. of Atomic Energy, Beijing, China

fYear

1993

fDate

17-20 May 1993

Firstpage

1611

Abstract

Adjustment and measurement of a hybrid undulator have been discussed. The magnetic field quality is limited by factors such as inhomogeneities of the permanent magnets, fabrications and assembly errors. Considering these factors, re-sorting of aluminum holders using the simulated annealing method and iron shimming have been used for the adjustment of the undulator. The measured rms field error was reduced from 3% to 0.3%, the electron trajectory deviation is around 0.1 mm. During our magnetic measurement, a small variation of magnetic period length was observed. An approach to reduce the deviation of the relative phase of electrons in the ponderomotive potential, which will lead to the reduction of laser gain degradation due to magnetic field errors is also discussed

Keywords

magnetic field measurement; magnetic fields; permanent magnets; wigglers; Al holders; electron trajectory deviation; hybrid undulator; iron shimming; laser gain degradation; magnetic field errors; magnetic field quality; magnetic measurement; magnetic period length; permanent magnets; ponderomotive potential; rms field error; simulated annealing; Aluminum; Assembly; Electrons; Fabrication; Iron; Magnetic field measurement; Magnetic variables measurement; Permanent magnets; Simulated annealing; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.308545

Filename

308545