Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Beschleunigerphysik V (Strahldiagnose I)
HK 24.4: Vortrag
Montag, 4. März 2013, 17:30–17:45, WIL-C205
Design of planar pick-ups for beam position monitor in the bunch compressor at FLASH and XFEL — •Aleksandar Angelovski1, Andreas Penirschke1, Cezary Sydlo2, Uros Mavric2, Christopher Gerth2, and Rolf Jakoby1 — 1Institut für Mikrowellentechnik und Photonik, TU Darmstadt, Germany — 2DESY, Hamburg, Germany
For obtaining ultra short electron bunches at the Free Electron Laser at DESY (FLASH) the beam is compressed in magnetic chicanes. During the compression process the precise knowledge of the energy of the bunches is essential for the longitudinal dynamics control. The measurement of the beam position in the chicane allows for non-destructive measurements of the energy. For that purpose, two stripline pick-ups perpendicular to the beam direction are installed in the chicane at FLASH as a part of the Beam Position Monitor. The recent upgrade in the electronics as well as the increased aperture and length of the beam pipe (for the European XFEL) requires the design of new pick-ups which will fulfill the new demands. Namely, the pick-ups should have maximum signal at 3 GHz with minimum reflections. In this talk, we will present the design of planar transmission line pick-ups for FLASH and XFEL. The planar design of the pick-ups can provide for a proper impedance matching to the subsequent electronics as well as sufficient mechanical stability along the aperture when using alumina substrate. A prototype of the pick-ups was build and installed in a non-hermetic body. The measured S parameters are compared to the simulation.