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 (+8 others)
2001 Physical Review Letters  
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.
doi:10.1103/physrevlett.87.244801 pmid:11736507 fatcat:xxxo5odynraxpfybbhgh4mxg4u