TY  - CONF
AU  - Götze, Kathrin
AU  - Vagin, Pavel
AU  - Neumann, Paul
AU  - Telawane, Sayali
AU  - Schoeps, Andreas
AU  - Ramm, Torsten
AU  - N'Gotta, Patrick
AU  - Tischer, Markus
TI  - Set-up and characterisation of a permanent magnet-based phase shifter series for FLASH2020
JO  - Journal of physics / Conference Series
VL  - 3010
IS  - 1
SN  - 1742-6588
CY  - Bristol
PB  - IOP Publ.
M1  - PUBDB-2024-07172
SP  - 012018
PY  - 2025
AB  - A compact, permanent magnet-based phase shifter was developed for theupgrade of the free-electron laser FLASH at DESY Hamburg. One phase shifter will bepositioned in each of the ten intersections between two radiator undulators and will allowfor a tuning of the electron trajectory to provide constructive interference of the radiationof adjacent undulators. Each phase shifter consists of eight permanent magnet blocksmounted on a support structure with movable gap. While building a prototype, it turnedout that angular magnetization errors of the individual magnet blocks are the main sourceof error that keeps us from achieving net zero first and second field integrals. Therefore,all 88 single magnet blocks were first characterized by stretched-wire and Helmholtz coilmeasurements individually and were then sorted according to the measurement resultsto achieve a cancellation of the angular magnetization errors. Using a dedicated guidingtool, the selected magnets were assembled into the magnet keepers. The completed phaseshifter devices were mapped by stretched-wire and Hall probe measurements. In orderto deal with small remaining kick errors, a novel tuning method was developed whichallows for a meticulous and individual correction.
T2  - 15th International Conference on Synchrotron Radiation Instrumentation
CY  - 26 Aug 2024 - 30 Aug 2024, Hamburg (Germany)
Y2  - 26 Aug 2024 - 30 Aug 2024
M2  - Hamburg, Germany
LB  - PUB:(DE-HGF)16 ; PUB:(DE-HGF)8
DO  - DOI:10.1088/1742-6596/3010/1/012018
UR  - https://bib-pubdb1.desy.de/record/618818
ER  -