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Past Activities

Longitudinal profile diagnostics using Smith-Purcell radiation

The objective of this research is the development of a method for the determination of the longitudinal (temporal) profile of short, intense and highly relativistic bunches of electrons. In principle, information about the longitudinal charge distribution inside the bunch can be obtained from any radiative process, whereby the beam is made to radiate a very small amount of energy. The wavelength distribution of this radiation can then be measured and used in order to infer the charge distribution inside the bunch. This is only possible if the radiation is coherent, i.e. if its wavelength is comparable to or longer than the bunch length. The first Smith-Purcell experiment in the multi-GeV regime [1] was recently carried out at SLAC (28.5GeV). The results from this experiment were very encouraging, and the bunch lengths measured were in line with alternative measurements (LOLA).
1. G. Doucas et al., EPAC2008.


ELMS is a study into the accurate simulation of the passage of Muons through matter, specifically Liquid Hydrogen, in order to investigate the feasibility of Muon Cooling. We showed that energy loss and scattering corellation present in the full cross section, but not considered by alternative treatments, might be significant. Seminar 2004 (PowerPoint) given in Oxford, 20th January 2004.