9 papers

title:	Measurements of plasma wake-fields in the blow-out regime
format:	conference procceeding
conference:	1995 Particle Accelerator Conference
year:	1995
9 authors:	N. Barov | M. Conde | J. B. Rosenzweig | Schoessow, P. | Cox, G. | W. Gai | Konecny, R. | J. Power | Simpson, J.
abstract:	Initial results from nonlinear plasma wake-field experiments at the Argonne Wakefield Accelerator (AWA) test facility are reported. This nonlinear "blow-out" regime is characterized by the complete ejection of the plasma electrons from the beam channel. The wake-fields in this case are of notably high quality for acceleration of electrons, as the acceleration is independent of transverse position, and the focusing is linear and independent of longitudinal position within the electron depleted region, allowing self-consistent guiding of the majority of the driving electron beam. Initial measurements of the energy gain in a witness beam indicate a positive shift in its energy distribution of at least 0.5 MeV. (9 References).
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title:	Demonstration of Electron-Beam Self-Focusing in Plasma Wake Fields
format:	unknown
year:	1990
10 authors:	J. B. Rosenzweig | Schoessow, P. | Cole, B. | Ho, C. | W. Gai | Konecny, R. | Mtingwa, S. | Norem, J. | Rosing, M. | Simpson, J.
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title:	Experimental studies of plasma wake-field acceleration and focusing
format:	unknown
year:	1990
10 authors:	J. B. Rosenzweig | Cole, B. | Ho, C. | W. Gai | Konecny, R. | Mtingwa, S. | Norem, J. | Rosing, M. | Schoessow, P. | Simpson, J.
abstract:	The Plasma Wake-field Accelerator (PWFA) continues to be the object of much investigation, due to the promise of the ultra-high accelerating gradients that can exist in relativistic plasma waves driven in the wake of charged particle beams. These large amplitude plasma wake-fields are of interest in the laboratory, both for the wealth of basic nonlinear plasma wave phenomena which can be studied, as well as for the applications of acceleration and focusing of electrons and positrons in linear colliders. Plasma wake-field waves are also of importance in nature, due to their possible role in direct cosmic ray acceleration. The purpose of the present work is to review the experimental advances made in PWFA research at Argonne National Laboratory, in which many interesting beam and plasma phenomena have been observed. Emphasis is given to discussion of the nonlinear aspects of the PWFA beam-plasma interaction. (29 References).
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title:	Demonstration of electron beam self-focusing in plasma wake fields
format:	conference procceeding
conference:	Annual Meeting of the Division of Plasma Physics of the APS
year:	1990
10 authors:	J. B. Rosenzweig | Schoessow, P. | Cole, B. | Ho, C. | W. Gai | Konecny, R. | Mtingwa, S. | Norem, J. | Rosing, M. | Simpson, J.
abstract:	The direct observation of wake-field self-focusing of an electron beam in plasma is reported. The dynamics of beam self-pinching and the fast collisionless evolution of a Bennett-like, near-equilibrium profile are examined theoretically and computationally. The experimental results are compared to predictions of the analysis and discussed in the context of application to the plasma lens and the plasma wake-field accelerator. (19 References).
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title:	Experimental Measurement of Nonlinear Plasma Wake-Fields
format:	conference procceeding
conference:	1989 Particle Accelerator Conference
year:	1989
7 authors:	J. B. Rosenzweig | Schoessow, P. | Cole, B. | W. Gai | Konecny, R. | Norem, J. | Simpson, J.
abstract:	We report direct high resolution observation of nonlinear steepened plasma waves excited in the wake of an intense, self-pinched electron beam. Oscillations in both accelerating and deflecting fields are measured, and analyzed in the context of linear and nonlinear plasma wave theory. The degree of nonlinearity in the wake-fields is shown to be consistent with analytical predictions of the beam self-pinching. The impact of these results on plasma acceleration and focusing schrmrs is discussed.
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title:	Argonne plasma wake-field acceleration experiments
format:	conference procceeding
conference:	1989 Workshop on Advanced Accelerator Concepts
year:	1989
7 authors:	J. B. Rosenzweig | Cole, B. | W. Gai | Konecny, R. | Norem, J. | Schoessow, P. | Simpson, J.
abstract:	Four years after the initial proposal of the Plasma Wake-field Accelerator (PWFA), it continues to be the object of much investigation, due to the promise of the ultra-high accelerating gradients that can exist in relativistic plasma waves driven in the wake of charged particle beams. These wake-fields are of interest both in the laboratory, for acceleration and focusing of electrons and positrons in future linear colliders, and in nature as a possible cosmic ray acceleration mechanism. The authors review the recent experimental advances made in PWFA research at Argonne National Laboratory. (25 References).
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title:	Experimental measurement of nonlinear plasma wake fields
format:	unknown
year:	1989
7 authors:	J. B. Rosenzweig | Schoessow, P. | Cole, B. | W. Gai | Konecny, R. | Norem, J. | Simpson, J.
abstract:	We report direct high-resolution observation of nonlinear steepened plasma waves excited in the wake of an intense, self-pinched electron beam. Oscillations in both accelerating and deflecting fields are measured, and analyzed in the context of linear and nonlinear plasma-wave theory. The degree of nonlinearity in the wake fields is shown to be consistent with analytical predictions of the beam self-pinching. The impact of these results on plasma acceleration and focusing schemes is discussed.
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title:	Experimental observation of plasma wake-field acceleration
format:	unknown
year:	1988
9 authors:	J. B. Rosenzweig | D. B. Cline | Cole, B. | Figueroa, H. | W. Gai | Konecny, R. | Norem, J. | Schoessow, P. | Simpson, J.
abstract:	The authors report the first experimental test of the physics of plasma wake-field acceleration performed at the Argonne National Laboratory Advanced Accelerator Test Facility. Megavolt-per-meter plasma wake fields are excited by a intense 21-MeV, multipicosecond bunch of electrons in a plasma of density n/sub e/ approximately=10/sup 13/ cm/sup -3/, and probed by a low-intensity 15-MeV witness pulse with a variable delay time behind the intense bunch. Accelerating and deflecting wake-field measurements are presented, and the results compared to theoretical predictions. (8 References).
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title:	Experimental Demonstration of Wake-Field Effects in Dielectric Structures
format:	unknown
year:	1988
7 authors:	W. Gai | Schoessow, P. | Cole, B. | Konecny, R. | Norem, J. | J. B. Rosenzweig | Simpson, J.
abstract:	We have measured the wake fields induced by short, intense relativistic electron bunches in a slow-wave structure consisting of a dielectric-lined tube, as a test of the dielectric wake-field acceleration mechanism. These fields were used to accelerate a second electron bunch which followed the driving bunch at a variable distance. Results are presented for different dielectrics and beam intensities, and are compared with theoretical predictions.
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