Dresden 2014 – wissenschaftliches Programm
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BE: Beschleunigerphysik
BE 2: Diagnostics and Instrumentation I
BE 2.1: Gruppenbericht
Montag, 31. März 2014, 15:00–15:30, ZEU 255
Status of Single-Shot EOSD Measurements at ANKA — •Nicole Hiller1, Andrii Borysenko1, Edmund Hertle1, Anke-Susanne Müller1, Michael J. Nasse1, Patrik Schönfeldt1, Marcel Schuh1, Nigel Smale1, Peter Peier2, Bernd Steffen2, Volker Schlott3, Benjamin Kehrer1, and Vitali Judin1 — 1LAS/IPS/ANKA Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Deutsches Elektronen Synchrotron (DESY), Hamburg, Germany — 3Paul-Scherrer Institut (PSI), Villigen, Switzerland
ANKA is the first storage ring in the world with a near-field single-shot electro-optical (EO) bunch profile monitor. The method of electro-optical spectral decoding (EOSD) uses the Pockels effect to modulate the longitudinal electron bunch profile onto a long, chirped laser pulse passing through an EO crystal. The laser pulse is then analyzed with a single-shot spectrometer and from the spectral modulation, the temporal modulation can be extracted. The setup has a sub-ps resolution (granularity) and can measure down to bunch lengths of 1.5 ps RMS for bunch charges as low as 30 pC. With this setup it is possible to study longitudinal beam dynamics (e. g. microbunching) occurring during ANKA’s low-alpha-operation, an operation mode with compressed bunches to generate coherent synchrotron radiation in the THz range. In addition to measuring the longitudinal bunch profile, long-ranging wake-fields trailing the electron bunch can also be studied, revealing bunch-bunch interactions. The talk will give an overview over beam dynamics studies performed with the system. This work is funded by the BMBF contract numbers: 05K10VKC, 05K13VKA.