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T: Fachverband Teilchenphysik

T 127: Beschleunigerphysik XIV (Strahldiagnose II)

T 127.7: 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 Jakoby¹ — ¹TU 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.