21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

M1Po2C-10 [43]: Magnetic Modelling of Fields and Losses in Fast Switching, Polarizing, Superconducting Undulators

22 Jul 2019, 14:00
Level 6, Cryo Expo Exhibit Hall

Level 6, Cryo Expo Exhibit Hall


Milan Majoros (The Ohio State University)


We have magnetically modelled a fast switching, polarizing, superconducting undulator. The particular design is called the SuperConducting Arbitrarily Po-larizing Emitter, or SCAPE, It has a four jaw design, and produces LCP, RCP, L-H and L-V polarization states. This design uses a dual SC undulator scheme to achieve fast switching. Each undulator is preset to generate a fixed polarization state and a small (alternating) current bump in each of the devices is used to actuate switching. The undulator period is 30 mm, the beam ID is 6 mm, and the peak field is 1 T, with a coil Je of 1200 A/mm2. The energization of the system has both AC and DC components, such that the strands experience a main DC field and a small AC cyclic field. Frequencies from a few Hz to hundreds of Hz are of interest. The present design for SCAPE uses low loss NbTi strands. We have used a combination of FEM modelling (of the undulator) and analytic modelling (of the strand) to make AC loss estimates as a function of frequency. We have also explored Nb3Sn conductors for this design, using fine filament, low loss conductors. We compare losses for these two implementations over a range of frequencies

Primary authors

Milan Majoros (The Ohio State University) Michael Sumption (for ICMC) Prof. Ted Collings (MSE, OSU) Dr Ibrahim Kesgin (Argonne National Laboratory) Dr Yury Ivanyushenkov (Argonne National Laboratory)

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