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BE: Beschleunigerphysik

BE 2: Diagnostics and Instrumentation I

BE 2.8: Talk

Monday, March 31, 2014, 17:15–17:30, ZEU 255

Cone-shaped pickups upgrade for the 40 GHz Bunch Arrival-time Monitors at FLASH and European XFEL — •Aleksandar Angelovski¹, Andreas Penirschke¹, Marie Kristin Czwalinna², Cezary Sydlo², Christopher Gerth², Holger Schlarb², Silke Vilcins-Czvitkovits², Thomas Weiland³, and Rolf Jakoby¹ — ¹Institut für Mikrowellentechnik und Photonik, TU Darmstadt, Germany — ²DESY, Hamburg, Germany — ³Institut für Theorie Elektromagnetischer Felder, TU Darmstadt, Germany

For sub-10 fs measurement resolution of the arrival time for electron bunches higher than 200 pC, an electro-optical detection scheme was developed and implemented at FLASH. The Bunch Arrival-time Monitors (BAMs) comprise pickup electrodes, an RF and electro-optical frontend and read out electronics. In order to measure the arrival time for charges as low as 20 pC the bandwidth of the BAMs was increased up to 40 GHz. First measurements show reduced signal strength due to high losses in the RF signal path. An analysis towards increasing the pickup signal level through modifying the pickup design is presented. A non-hermetic demonstrator is build to compare RF measurements with CST STUDIO SUITE simulations.