NDLI: Longitudinal Structure of Electron Bunches at the Micrometer Scale from Spectroscopy of Coherent Transition Radiation

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Longitudinal Structure of Electron Bunches at the Micrometer Scale from Spectroscopy of Coherent Transition Radiation

Content Provider	Semantic Scholar
Author	Behrens, Christopher Delsim-Hashemi, Hossein Schmueser, Peter Wesch, Stephan
Copyright Year	2008
Abstract	At the free electron laser FLASH, the electron bunches are compressed using two successive magnetic chicanes. The longitudinal energy chirp needed for this purpose is produced by operating the RF modules in front of the magnetic chicanes (ACC1 and ACC2/3) at off-crest phases. The non-linear time dependence of the RF field results in a time profile of the bunch charge with a very narrow leading spike with peak currents of the order kA which are necessary to drive the SASE process in the undulators. The high charge density in this spike leads to a complicated beam dynamics with strong contributions from collective effects like space charge and emission of coherent synchrotron radiation which critically depends on the details of the bunch compressor operation [5]. To study the longitudinal charge distribution experimentally, several techniques have been implemented at FLASH. Single shot electro-optic experiments are noninvasive but intrinsic properties of the electro-optic crystals limit their resolution to about 50 fs (15 μm) (rms) [1]. The most comprehensive and direct visualization of the bunch profile is achieved with a transverse-deflecting structure (TDS) with a time resolution of 15 20 fs (5-7μm) (rms) depending on machine optics [2]. Spectroscopy of coherent transition radiation (CTR) is an indirect method, not allowing for a direct reconstruction of the longitudinal profile, but has the unique feature of being capable to detect the presence of structures in the bunches down to optical wavelengths.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://accelconf.web.cern.ch/AccelConf/e08/papers/mopc029.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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