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arxiv: physics/0110015 · v1 · submitted 2001-10-04 · ⚛️ physics.acc-ph

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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
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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
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classification ⚛️ physics.acc-ph
keywords beamfocusingplasmaobservationpositronareacalculationscompared
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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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