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Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 82: Beschleunigerphysik XIV (Strahldiagnose II)

HK 82.7: Vortrag

Donnerstag, 7. März 2013, 18:15–18:30, WIL-C203

Bunch arrival time monitors; Concepts towards improving the sensitivity for low charge operation for FLASH II and XFEL — •Andreas Penirschke1, Aleksandar Angelovski1, Cesary Sydlo2, Michael Bousonville2, Alexander Kuhl3, Marie Kristin Czwalinna2, Holger Schlarb2, Thomas Weiland4, and Rolf Jakoby11TU Darmstadt, Institut für Mikrowellentechnik und Photonik, Merckstr. 25, 64283 Darmstadt — 2Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg — 3University of Hamburg, Physics Department, Accelerator physics group — 4TU Darmstadt, Institut Theorie Elektromagnetischer Felder, Schlossgartenstr. 8, 64289 Darmstadt

High gain Free-Electron Lasers can generate ultra short X-ray pulses in the femtosecond range. For a stable operation of the FEL, the precise knowledge of the bunch arrival time is crucial. A novel high bandwidth Bunch Arrival time Monitor was recently installed at FLASH to allow a low charge operation mode with a sub-10fs resolution for bunch charges of 20pC or more. The BAM is equipped with cone shaped pickups for the precise measurement of both, the high and low bunch charge operation mode. For the extension of FLASH facility to FLASH II new pickups for the high bandwidth BAMs need to be developed. The new BAM needs to maximize the voltage level of the beam induced signal for low charge operation mode in order to provide sufficient signal strength for the subsequent electronics. In this talk, we will present concepts to improve the signal strength at the electro-optic modulators for low charge operation at FLASH II and XFEL.

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