München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 81: Beschleunigerphysik 4

T 81.4: Talk

Thursday, March 12, 2009, 17:35–17:50, A213

Magnetic field transients in superconductive undulators — •Sandra Ehlers¹, Axel Bernhard¹, Golo Fuchert¹, Peter Peiffer¹, Robert Rossmanith², Daniel Schörling³, Daniel Wollmann¹, and Tilo Baumbach¹ — ¹Lab. für Applikationen der Synchrotronstrahlung, Universität Karlsruhe, Deutschland — ²Inst. für Synchrotronstrahlung, Forschungszentrum Karlsruhe, Deutschland — ³TU Bergakademie Freiberg, Deutschland

The next step towards introducing superconductive undulators as the new generation of insertion devices is to understand the impact of dynamic effects in the superconducting coils on the accelerator beam. These effects are seen as a temporal drift of the beam orbit, originating from transients of the magnetic field. The first systematic time resolved measurements of such drifts have been performed ANKA. Orbit displacement during several different ramping cycles, for different ramp rates and relaxation times, has been investigated.

This contribution summarises the results of the measurements. The persistent current effects in the superconducting wires, as well as eddy currents in the yoke are discussed as possible sources for the transients.