THz radiation as a bunch diagnostic forlaser-wakefield-accelerated electron bunches

Journal Article · Wed Feb 15 04:00:00 EST 2006 · Physics of Plasmas 13 (5)

DOI:https://doi.org/10.1063/1.2187957· OSTI ID:923273

van Tilborg, J; Schroeder, C B; Filip, C V; Toth, Cs; Geddes, C G.R.; Fubiani, G; Esarey, E; Leemans, W P

Experimental results are reported from two measurementtechniques (semiconductor switching and electro-optic sampling) thatallow temporal characterization of electron bunches produced by alaser-driven plasma-based accelerator. As femtosecond electron bunchesexit the plasma-vacuum interface, coherent transition radiation (at THzfrequencies) is emitted. Measuring the properties of this radiationallows characterization of the electron bunches. Theoretical work on theemission mechanism is represented, including a model that calculates theTHz waveform from a given bunch profile. It is found that the spectrum ofthe THz pulse is coherent up to the 200 mu m thick crystal (ZnTe)detection limit of 4 THz, which corresponds to the production of sub-50fs (root-mean-square) electron bunch structure. The measurementsdemonstrate both the shot-to-shot stability of bunch parameters that arecritical to THz emission (such as total charge and bunch length), as wellas femtosecond synchrotron between bunch, THz pulse, and laserbeam.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. High EnergyPhysics
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 923273
• Report Number(s): LBNL--60017; BnR: KA1501020
• Journal Information: Physics of Plasmas 13 (5), Journal Name: Physics of Plasmas 13 (5) Journal Issue: 5 Vol. 13; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ELECTRONS
LASERS
PRODUCTION
RADIATIONS
SAMPLING
SENSITIVITY
STABILITY
SYNCHROTRONS
TRANSITION RADIATION
WAVE FORMS
laser wakefield plasma accelerator