Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser

Wiggins, Mark and Jaroszynski, D.A. and McNeil, B.W.J. and Robb, G.R.M. and Aitken, P. and Phelps, A.D.R. and Cross, A.W. and Ronald, K. and Ginzburg, N.S. and Shpak, V.G. and Yalandin, M.I. and Shunailov, S.A. and Ulmaskulov, M.R. (2000) Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser. Physical Review Letters, 84 (11). pp. 2393-2396. ISSN 0031-9007

Full text not available in this repository. Request a copy from the Strathclyde author

Abstract

Ultrashort pulses of microwave radiation have been produced in a dielectric-lined Cherenkov free-electron maser (FEM) amplifier. An intense initial seed pulse, due to coherent spontaneous emission (CSE), arises at the leading edge of the electron pulse. There is evidence to show that 3-4 cycle spikes are produced through the amplification of these seed pulses. A strong dependence of the start-up power on the rise time of the electron pulse has been found. The experimental results are verified by a theoretical analysis. Our study shows that amplification in a FEM amplifier is always initiated by CSE arising from the edge of the electron pulse when the rise time is comparable to the electromagnetic wave period.