NSLS-II Seminar

"Undulator Development and Operation at BESSY II"

Presented by Johanns Bahrdt, Helmholtz-Zentrum Berlin, Germany

Monday, October 10, 2011, 10:00 am — NSLS-II Seminar Room, Bldg. 817

All permanent magnet undulators have been constructed and built at BESSY. The major part of the BESSY user community needs variable polarization and, thus, 6 APPLE II undulators are installed. Furthermore, a 5m long APPLE II undulator has been built at HZB for PETRA III. The device has been installed and characterized with electron beam. The operation of APPLE II undulators in a low electron energy storage ring such as BESSY II requires specific compensation schemes and accurate symplectic tracking schemes are essential. Recently, the undulator development at HZB concentrated on cryogenic permanent magnet undulators. A 20 period 9mm period length PrFeB based hybrid undulator has been built, magnetically characterized at low temperatures and tested with electron beam at MAMI. The results of this prototype are valuable for a 1.5m cryogenic undulator to be built for BESSY II.

Hosted by: Reuben Reininger

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