Speakers
Description
The worldwide first in-vacuum elliptical undulator, IVUE32, is being
developed at Helmholtz-Zentrum Berlin. The 2.5 m long device with a
period length of 3.2 cm and a minimum gap of about 7 mm is to be
installed in the BESSY II storage ring. The device follows the Apple-II
design and features four magnet rows. Both the two bottom and two top
rows can be shifted longitudinally. This shift needs to be permitted by
the shielding foils that cover the permanent magnets. The proposed
solution calls for a longitudinal slit in the top and bottom shielding
foils, which gets folded into the gap between the top and bottom magnet
rows respectively. The manufacturer states that the folding process can introduce a small sinusoidal error to the slit width. We will present wakefield simulation studies that investigate the effect of different possible foil gap variations.
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