SMuK 2021 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Instrumentation III
HK 8.6: Talk
Tuesday, August 31, 2021, 15:30–15:45, H1
Angular error correction by analysing the Fresnel diffraction in an undulator interferometer — •Pascal Klag1, Patrick Achenbach1, Philipp Eckert1, Toshiyuki Gogami2, Philipp Herrmann1, Masashi Kaneta3, Sho Nagao3, Satoshi Nakamura3, Josef Pochodzalla1, and Yuichi Toyama3 for the A1 collaboration — 1Johannes Gutenberg-Universität Mainz — 2Kyoto University, Kyoto — 3Tohoku 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 energies of 180 and 195 MeV. The method is based on interferometry with two spatially separated light sources (undulators) driven by relativistic electrons. The improved resolution of the setup revealed the modification of the undulator interference by Fresnel diffraction. A detailed analysis allowed to compensate for this structure and led to an enhanced accuracy of the measurement. The determination of the angle of observation strongly benefited from the diffraction. High precision beam stabilization has been used to fix the electron beam at optimal conditions. Supported by DFG (PO 256/7-1) Supported by the European Union’s Horizon 2020 programme, No 824093.