München 2019 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 4: Diagnostics, Control and Instrumentation
AKBP 4.4: Vortrag
Montag, 18. März 2019, 17:15–17:30, HS 7
Revealing experimental instabilities and improvements in the optics for Undulator interferometry — •Pascal Klag1, Patrick Achenbach1, Toshiyuki Gogami2, Philipp Herrmann1, Masashi Kaneta2, Yoshihiro Konishi2, Werner Lauth1, Sho Nagao2, Satoshi Nakamura2, Josef Pochodzalla1, and Yuichi Toyama2 — 1Johannes Gutenberg-Universität Mainz — 2Tohoku University Sendai
The Mainz microtron is an electron accelerator, which delivers electron energies up to 1.6 GeV, with a small spread of the energy σbeam<13keV. The uncertainty for the absolute energy for all available beam energies was limited to 160 keV. A novel method is used to improve the uncertainty for the energy of a 195 MeV beam. The method is based on interferometry with two spatially separated light sources (undulators) driven by relativistic electrons. A beamtime has been performed, that was dedicated to systematic effects of the energy measurement by undulator interferometry. The analysis of the data revealed that a combination of the moving stage, optics, the magnetic field and the stabilization of the electron beam acted as sources for deviations from a distortion free signal. The uncertainty for the measurement shall be quantified on a maximal rigid system. The presentation will cover how the optics gave a systematic error, but on the other hand, how they beneficially contributed to the alignment.