München 2019 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: Diagnostics, Control and Instrumentation
AKBP 2.2: Vortrag
Montag, 18. März 2019, 14:15–14:30, HS 7
Vertical Beam-Size Diagnostics at BESSY II: A Comparative Study — •Marten Koopmans1,2, Ji-Gwang Hwang1, Peter Kuske1, Markus Ries1, and Gregor Schiwietz1 — 1Helmholtz-Zentrum Berlin — 2Humboldt-Universität zu Berlin
With the VSR upgrade for the BESSY II electron storage ring [1] bunch resolved diagnostics are required for machine commissioning and to ensure the long-term quality and stability of operation. For transverse beam size measurements we are going to use an interferometric method, which will be combined with a fast intensified CCD camera at a subsequent stage. A double-slit interferometer method has already been verified successfully at BESSY II [2]. In addition the obstacle-bar method [3] is presently being tested as an alternative interferometric technique. It uses diffraction from a centered horizontal X-ray blocker for vertical beam-size determination. This technique will lead to enhanced photon statistics and possibly improve monitor resolution. We are using either π- or σ-polarized synchrotron radiation at the first of the new diagnostic beamlines for BESSY VSR. Measurements of the two interferometer schemes and X-ray pinhole as function of a vertical electron beam excitation are compared. The results will be presented and discussed at the conference.
[1] A. Jankowiak et al., eds., "BESSY VSR - Technical Design Study", HZB, Germany, June 2015. DOI: 10.5442/R0001
[2] M. Koopmans et al., in Proc. IPAC’17, pp. 149-152.
[3] J. Breunlin et. al., in Nucl. Instrum. Meth., vol. A803, pp. 55-64, 2015