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Description
In the SLS2.0 upgrade project at the Paul Scherrer Institute (PSI) the injector complex remained mostly unchanged, but we had to design three new storage ring injection elements: the thick septum, the thin septum and beam dump system. Because of the limited dynamic aperture of the upgraded machine, 1 mm septum wall thickness was necessary. To limit stored beam disturbance to 10% of the beam sigma, extremely low (<8 μT) leakage field was required. To achieved this, we used a “sandwich” septum consisting of a copper sheet and a layer of soft magnetic material. In this way we achieved very good screening of the main field.
To power the thin septum, we designed a pulse generator based on a two-stage fast thyristors switch and a matrix capacitor. The latter was built using multiple commercially available ceramic SMD capacitors to avoid the risk of catastrophic failure of the oil filled foil capacitors. We successfully built and commissioned the thin septum and, it works reliably.
In this paper, we present design and operational results of the pulsed thin septum, including simulations and measured results of the main and leakage field. Beam based leakage field evaluation is described as well.
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