Observation of Plasma Focusing of a 28.5 GeV Positron Beam
J. S. T. Ng, P. Chen, H. Baldis, P. Bolton, D. Cline, W. Craddock, C. Crawford, F. J. Decker, C. Field, Y. Fukui, V. Kumar, R. Iverson, F. King, R. E. Kirby, K. Nakajima, R. Noble, A. Ogata, P. Raimondi, D. Walz, A. W. Weidemann
Abstract
The observation of plasma focusing of a 28.5 GeV positron beam is reported. The plasma was formed by ionizing a nitrogen jet only 3 mm thick. Simultaneous focusing in both transverse dimensions was observed with effective focusing strengths of order Tesla per micron. The minimum area of the beam spot was reduced by a factor of 2.0 +/- 0.3 by the plasma. The longitudinal beam envelope was measured and compared with numerical calculations.
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