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Schoessow, P.

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13 papers

title: An Optimized Slab-Symmetric Dielectric-Based Laser Accelerator Structure

format: conference procceeding

conference: 8th Advanced Accelerator Concepts Workshop

year: 1999

2 authors: J. B. Rosenzweig | Schoessow, P.

abstract: A slab-symmetric, partially dielectric filled, laser excited structure which may be used to accelerate charged particles is analyzed theoretically and computationally. The fields associated with the accelerating mode are calculated, as are aspects of the resonant filling and impedance matching of the structure to the exciting laser. It is shown through computer simulation that the accelerating mode in this structure can be excited resonantly and with large quality factor Q. Practical aspects of implementing this structure as an accelerator are discussed. (7 References).

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title: Electromagnetic Wake-fields and Beam Stability in Slab-symmetric Dielectric Structures

format: preprint

year: 1997

3 authors: A. Tremaine | J. B. Rosenzweig | Schoessow, P.

abstract: Several promising schemes for high-gradient acceleration of charged particles in slab-symmetric electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake-fields experienced by a relativistic charged particle beam in a planar structure. We show that in the limit of an infinitely wide beam the net deflecting wake-fields vanishes. This result is verified in the limit of a large aspect ratio (sheet) beam by finite beam analysis based on a Fourier decomposition of the current profile, as well as a paraxial wave analysis of the wake-fields driven by Gaussian profile beams. The Fourier analysis forms the basis of an examination of flute instability in the sheet beam system. Practical implications of this result for beam stability and enhanced current loading in short wavelength advanced accelerators are discussed.

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title: Electromagnetic wake fields and beam stability in slab-symmetric dielectric structures

format: unknown

year: 1997

3 authors: A. Tremaine | J. B. Rosenzweig | Schoessow, P.

abstract: Several promising schemes for high-gradient acceleration of charged particles in slab-symmetric electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake fields experienced by a relativistic charged particle beam in a planar structure. We show that in the limit of an infinitely wide beam the net deflecting wake fields vanishes. This result is verified in the limit of a large aspect ratio (sheet) beam by finite beam analysis based on a Fourier decomposition of the current profile, as well as a paraxial wave analysis of the wake fields driven by Gaussian profile beams. The Fourier analysis forms the basis of an examination of flute instability in the sheet beam system. Practical implications of this result for beam stability and enhanced current loading in short-wavelength advanced accelerators are discussed.

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title: Wakefields In Planar Dielectric-Loaded Structures

format: conference procceeding

conference: Summer Study on New Directions for High Energy Physics

year: 1997

4 authors: A. Tremaine | J. B. Rosenzweig | Schoessow, P. | W. Gai

abstract: Several promising schemes for high-gradient acceleration of charged particles in planar electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake-fields experienced a relativistic charged particle in a planar structure. We show that, in the limit of a large aspect ratio beam, the net deflecting wake-fields vanishes. Practical implications of this result for short wavelength advanced accelerators are discussed.

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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

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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

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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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title:	An Optimized Slab-Symmetric Dielectric-Based Laser Accelerator Structure
format:	conference procceeding
conference:	8th Advanced Accelerator Concepts Workshop
year:	1999
2 authors:	J. B. Rosenzweig \| Schoessow, P.
abstract:	A slab-symmetric, partially dielectric filled, laser excited structure which may be used to accelerate charged particles is analyzed theoretically and computationally. The fields associated with the accelerating mode are calculated, as are aspects of the resonant filling and impedance matching of the structure to the exciting laser. It is shown through computer simulation that the accelerating mode in this structure can be excited resonantly and with large quality factor Q. Practical aspects of implementing this structure as an accelerator are discussed. (7 References).
keywords:
Download \| View \| Details \| edit \| delete

title:	Electromagnetic Wake-fields and Beam Stability in Slab-symmetric Dielectric Structures
format:	preprint
year:	1997
3 authors:	A. Tremaine \| J. B. Rosenzweig \| Schoessow, P.
abstract:	Several promising schemes for high-gradient acceleration of charged particles in slab-symmetric electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake-fields experienced by a relativistic charged particle beam in a planar structure. We show that in the limit of an infinitely wide beam the net deflecting wake-fields vanishes. This result is verified in the limit of a large aspect ratio (sheet) beam by finite beam analysis based on a Fourier decomposition of the current profile, as well as a paraxial wave analysis of the wake-fields driven by Gaussian profile beams. The Fourier analysis forms the basis of an examination of flute instability in the sheet beam system. Practical implications of this result for beam stability and enhanced current loading in short wavelength advanced accelerators are discussed.
keywords:
Download \| View \| Details \| edit \| delete

title:	Electromagnetic wake fields and beam stability in slab-symmetric dielectric structures
format:	unknown
year:	1997
3 authors:	A. Tremaine \| J. B. Rosenzweig \| Schoessow, P.
abstract:	Several promising schemes for high-gradient acceleration of charged particles in slab-symmetric electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake fields experienced by a relativistic charged particle beam in a planar structure. We show that in the limit of an infinitely wide beam the net deflecting wake fields vanishes. This result is verified in the limit of a large aspect ratio (sheet) beam by finite beam analysis based on a Fourier decomposition of the current profile, as well as a paraxial wave analysis of the wake fields driven by Gaussian profile beams. The Fourier analysis forms the basis of an examination of flute instability in the sheet beam system. Practical implications of this result for beam stability and enhanced current loading in short-wavelength advanced accelerators are discussed.
keywords:
Download \| View \| Details \| edit \| delete

title:	Wakefields In Planar Dielectric-Loaded Structures
format:	conference procceeding
conference:	Summer Study on New Directions for High Energy Physics
year:	1997
4 authors:	A. Tremaine \| J. B. Rosenzweig \| Schoessow, P. \| W. Gai
abstract:	Several promising schemes for high-gradient acceleration of charged particles in planar electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake-fields experienced a relativistic charged particle in a planar structure. We show that, in the limit of a large aspect ratio beam, the net deflecting wake-fields vanishes. Practical implications of this result for short wavelength advanced accelerators are discussed.
keywords:
Download \| View \| Details \| edit \| delete

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).
keywords:
Download \| View \| Details \| edit \| delete

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.
abstract:
keywords:
Download \| View \| Details \| edit \| delete

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).
keywords:
Details \| edit \| delete

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).
keywords:
Details \| edit \| delete

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.
keywords:
Download \| View \| Details \| edit \| delete

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).
keywords:
Details \| edit \| delete

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).
keywords:
Download \| View \| Details \| edit \| delete

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.
keywords:
Download \| View \| Details \| edit \| delete

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