SMuK 2021 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation III

HK 8.6: Vortrag

Dienstag, 31. August 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 σ_beam<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.