Measurement and correction of magnetic fields in pulsed slotted-tube microwigglers
Pulsed electromagnetic microwigglers are capable of creating stronger fields with shorter periods than conventional wigglers. Wiggler field parameters of 1 Tesla and 5-mm period are achieved by passing {approximately}25 kA down a slotted 3 mm outer diameter copper tube. The taut -wire technique is used to measure the wiggler magnetic field in a small aperture ({approximately}1.7 mm) with the required spatial (0.1 mm) and temporal ({approximately}5 {mu}s) resolution. The absence of midplane symmetry, in contrast to permanent magnet wigglers, causes unique problems in our microwigglers. We have measured strong dipole (bending) and quadrupole (defocusing) field errors with both dc and time-dependent parts. The effects on the magnetic field of current redistribution caused by heating in the copper tube has been measured. We have identified causes for the various field errors and their sensitivities to fabrication tolerances. Improvements we have made towards meeting the required tolerances and our field-correction technique will be discussed.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10181405
- Report Number(s):
- LA-UR-93-2924; CONF-930855-2; ON: DE93040100
- Resource Relation:
- Conference: 15. international free electron laser conference,The Hague (Netherlands),23-27 Aug 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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