First Name: P
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Last Name: Chen
Full Name: Chen, P.
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10 papers
| title: | Quantum effects in high-gain free-electron lasers |
| format: | unknown |
| year: | 2001 |
| 3 authors: | | | |
| abstract: | A many-particle fully quantized theory for a free-electron laser which is valid in the high-gain regime is presented. We examine quantum corrections for the high-gain single-pass free-electron laser. It is shown that quantum effects become significant when the photon energy becomes comparable to the gain bandwidth. The initiation of the free-electron laser process from quantum fluctuations in the position and momentum of the electrons is considered, and the parameter regime for enhanced start-up is identified. Photon statistics of the free-electron laser radiation are discussed, and the photon number statistics for the self-amplified spontaneous emission are calculated. (21 References). |
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| 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: | Transverse equilibria and luminosity enhancement in linear collider beam-beam collisions |
| format: | unknown |
| year: | March 8, 1994 |
| 2 authors: | | |
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| title: | Plasma Lens Experiments at the Final Focus Test Beam |
| format: | conference procceeding |
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| 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: | Remarks on the production of gravitational waves by EM radiation and particle beams |
| format: | conference procceeding |
| conference: | Workshop on Beam-Beam and Beam-Radiation Interactions: High Intensity and Nonlinear Effects |
| year: | 1992 |
| 4 authors: | | | | |
| abstract: | A report of the working group on the production of Gravitational Waves from electromagnetic radiation (EM) and particle beams. (9 References). |
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| title: | Transverse equilibria in linear collider beam-beam collisions |
| format: | conference procceeding |
| conference: | 1991 Particle Accelerator Conference |
| year: | 1991 |
| 2 authors: | | |
| abstract: | An analytical model of the equilibrium approached by the beams, that of a generalized Bennett pinch which develops through collisionless damping due to the strong nonlinearity of the beam-beam interaction is presented. In order to calculate the equilibrium pinched beam size, an estimation of the RMS emittance growth is made which takes into account the partial adiabaticity of the collision. This pinched beam size is used to derive the luminosity enhancement factor, whose scaling is in agreement with the simulation results for both D and thermal factor A= sigma /sub z// beta * large, and explains the previously noted cubic relationship between round and flat beam enhancement factors. (4 References). |
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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: | Transverse Equilibria in Linear Collider Beam-Beam Collisions |
| format: | unknown |
| year: | 1991 |
| 2 authors: | | |
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| title: | Final focusing and enhanced disruption from an underdense plasma lens in a linear collider |
| format: | unknown |
| year: | 1989 |
| 3 authors: | | | |
| abstract: | In this work we examine the viability of employing an underdense plasma lens as a final focusing method for a linear e+e- collider. The underdense plasma lens is superior to the overdense lens in that it improves focusing linearity and background event rate, but works well only for electrons. We thus consider the interaction of an e- beam which is smaller than the e+ beam at collision, a case we term "bootstrap disruption." The potential luminosity enhancement is determined by analysis of the lens optics and simulation of the bootstrap disruption. |
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| title: | Beam optics of a self-focusing plasma lens |
| format: | unknown |
| year: | 1989 |
| 2 authors: | | |
| abstract: | In this paper the authors analyze the optics of a high-energy beam which is focused by its own wakefields in a plasma. They calculate the effects of lens aberrations on the focusing strength of the lens and on the dilution of the beam's phase space. From this they derive the minimum spot size achievable using a bi-Gaussian beam and, after inclusion of the beam-beam pinch effect, the luminosity enhancement that can be gained in principle. They estimate the luminosity enhancement in the case of SLAC Linear Collider beam design parameters, and discuss limitations and possible improvements in plasma-lens performance. (7 References). |
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