First Name: J
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Last Name: Norem
Full Name: Norem, J.
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12 papers
| title: | Progress on Plasma Lens Experiments at the Final Focus Test Beam |
| format: | conference procceeding |
| conference: | 1995 Particle Accelerator Conference |
| year: | 1995 |
| 34 authors: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| abstract: | The proposal to perform a series of plasma lens experiments at the Final Focus Test Beam at SLAC has been described earlier. We report on our progress towards validation of concepts involved in the experiments, including the laser ionized plasma production test, development of the supersonic gas jet as the plasma source, and study on focused beam size measurement techniques. Most importantly, the effects of background events due to plasma lenses in future linear collider detectors, such as that in the NLC, are studied in details and are shown to be within detector tolerances. |
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| title: | Plasma Lens Experiments at the Final Focus Test Beam |
| format: | conference procceeding |
| conference: | |
| year: | 1995 |
| 33 authors: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| abstract: | We intend to carry out a series of plasma lens experiments at the Final Focus Test Beam facility at SLAC. These experiments will be the first to study the focusing of particle beams by plasma focusing devices in the parameter regime of interest for high energy colliders, and is expected to lead to plasma lens designs capable of unprecedented spot sizes. Plasma focusing of positron beams will be attempted for the first time. We will study the effects of lens aberrations due to various lens imperfections. Several approaches will be applied to create the plasma required including laser ionization and beam induced tunneling ionization of a working gas - the latter which has never been observed before. The compactness of our device should prove to be of interest for applications at the SLC and the next generation linear colliders. |
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| title: | Plasma Lenses for SLAC Final Focus Test Facility |
| format: | conference procceeding |
| conference: | 1991 Particle Accelerator Conference |
| year: | 1991 |
| 11 authors: | | | | | | | | | | | |
| abstract: | A collaborative group of accelerator and plasma physicists and engineers has formed with an interest in exploring the use of plasma lenses to meet the needs of future colliders. Analytic and computational models of plasma lenses are briefly reviewed and several design examples for the SLAC Final Focus Test Beam are presented. The examples include discrete, thick, and adiabatic lenses. A potential plasma source with desirable lens characteristics is presented. |
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| title: | Demonstration of Electron-Beam Self-Focusing in Plasma Wake Fields |
| format: | unknown |
| year: | 1990 |
| 10 authors: | | | | | | | | | | |
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| title: | Experimental studies of plasma wake-field acceleration and focusing |
| format: | unknown |
| year: | 1990 |
| 10 authors: | | | | | | | | | | |
| 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: | | | | | | | | | | |
| 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: | unknown |
| year: | 1989 |
| 7 authors: | | | | | | | |
| 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 Measurement of Nonlinear Plasma Wake-Fields |
| format: | conference procceeding |
| conference: | 1989 Particle Accelerator Conference |
| year: | 1989 |
| 7 authors: | | | | | | | |
| 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: | | | | | | | |
| 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 Demonstration of Wake-Field Effects in Dielectric Structures |
| format: | unknown |
| year: | 1988 |
| 7 authors: | | | | | | | |
| 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: | Experimental observation of plasma wake-field acceleration |
| format: | unknown |
| year: | 1988 |
| 9 authors: | | | | | | | | | |
| 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: | Transverse Focussing Using Plasma Wake Fields |
| format: | conference procceeding |
| conference: | 1987 Particle Accelerator Conference |
| year: | 1987 |
| 4 authors: | | | | |
| abstract: | Dense particle beams travelling in plasmas can produce very high electric and magnetic fields, and these fields, described by Chen and others can be used to accelerate and focus particles. The effects on trailing beams and self focussing can be strong and nonlinear. This paper discusses two aspects of self pinching beams: 1) the production of beams which do not self pinch, and 2) a short focal length plasma lens which uses self pinching to reduce beam sizes at the interaction point of a linear collider. As an example, we consider a final focus system for the Stanford Linear Collider, considering plasma production, vacuum system and backgrounds, and show how the luminosity could be increased using this system. We also discuss experimental tests of the plasma lens concept. |
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