Terahertz Coherent Synchrotron Radiation from Femtosecond LaserModulation of the Electron Beam at the Advanced Light Source

Conference · Sun May 01 04:00:00 EDT 2005

OSTI ID:891015

Byrd, John M; Hao, Zhao; Martin, Michael C; Robin, David S; Sannibale, Fernando; Schoenlein, Robert W; Zholents, Alexander A; Zolotorev, Max S

At the Advanced Light Source (ALS), the ''femtoslicing'' beamline is in operation since 1999 for the production of x-ray synchrotron radiation pulses with femtosecond duration. The mechanism used for generating the short x-ray pulses induces at the same time temporary structures in the electron bunch longitudinal distribution with very short characteristic length. Such structures emit intense coherent synchrotron radiation (CSR) in the terahertz frequency range. These CSR pulses were first observed at the ALS, and the measurement of their intensity is now routinely used as a diagnostics for the tune-up of the femtoslicing x-ray experiments. At the same time, these CSR pulses synchronous with the modulating laser, represent a potential source of terahertz radiation with very interesting features. Several measurements have been performed for their characterization and in this paper we present an updated description of the experimental results and of their interpretation. In particular, we include more data on the interesting interaction, previously observed at the ALS, between the slicing and the microbunching instability (MBI), where under particular circumstances, the slicing seems to trigger the onset of the instability.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of High EnergyPhysics
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 891015
• Report Number(s): LBNL--57592; CBP Note - 754; BnR: KA1501020
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ADVANCED LIGHT SOURCE
CSR coherent synchrotron radiation femtoslicinginstability
DISTRIBUTION
ELECTRON BEAMS
ELECTRONS
INSTABILITY
LASERS
MODULATION
PRODUCTION
RADIATIONS
SYNCHROTRON RADIATION
THZ RANGE