Velocity Bunching Experiment at the Neptune Laboratory

Details Velocity Bunching Experiment at the Neptune Laboratory Velocity Bunching Experiment at the Neptune Laboratory

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..647..858m&link_type=abstract

ADVANCED ACCELERATOR CONCEPTS: Tenth Workshop. AIP Conference Proceedings, Volume 647, pp. 858-868 (2002).

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Other Advanced Accelerator Concepts, Beam Extraction, Beam Injection, Electron And Positron Beams, Beam Injection And Extraction

Scientific paper

In this paper we describe the ballistic bunching compression experiment at the Neptune photoinjector at UCLA. We have compressed the beam by chirping the beam energy spectrum in a short S-band high gradient standing wave RF cavity and then letting the electrons undergo velocity compression in the subsequent rectilinear drift. Using a standard Martin Puplett interferometer for coherent transition radiation measurement, we have observed bunch length as short as 0.4 ps with compression ratio in excess of 10 for an electron beam of 7 MeV and charge up to 0.3 nC. We also measured slice transverse emittance via quad scan technique. The observed emittance growth agrees with the predictions and the simulations. Extension of this scheme to a future advanced accelerator injector system where solenoidal magnetic field can compensate the emittance growth is studied.

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