First Name: J
Middle Name: B
Last Name: Murphy
Full Name: J. B. Murphy
tags:
Potential Duplicate Authors:
view citation format
4 papers
| title: | Introduction to the physics of the free electron laser |
| format: | conference procceeding |
| conference: | Joint US-CERN School of Particle Accelerators: Frontiers of Particle Beams |
| year: | 1988 |
| 2 authors: | | |
| abstract: | The authors explore the basic physics of the FEL, emphasizing the underlying physical principles with a minimum of mathematics. The description is based on the classical theory of the FEL as that is sufficient to explain most of the physics. The elementary principles of operation of an FEL and the trajectory of an electron in the magnetic field of both helical and planar undulator magnets are presented. The trajectories are then used to calculate the spontaneous emission of an electron in an undulator magnet. The electron equations of motion are extended to include the forces due to both the undulator and the radiation field. If the change in the radiation field is small in one pass through the undulator, one can compute the so-called 'small signal gain' of the FEL using only the particle equations of motion; the radiation field is assumed to remain constant. The potential for increasing the efficiency of an FEL by tapering the period and magnetic field strength of the undulator magnet is discussed. |
| keywords: | |
| Details | edit | delete | |
| title: | Collective Instability of a Free-Electron Laser Including Space-Charge and Harmonics |
| format: | unknown |
| year: | 1985 |
| 3 authors: | | | |
| abstract: | The effects of harmonics, space charge and electron energy spread on the collective instability regime of an electron beam coupled to a planar undulator are analyzed. Both analytical and numerical results are presented. |
| keywords: | |
|
Download | View | Details | edit | delete |
|
| title: | Generation of high-intensity coherent radiation in the soft-X-ray and vacuum-ultraviolet region |
| format: | unknown |
| year: | 1985 |
| 2 authors: | | |
| abstract: | An electron beam can be made to interact with an undulator magnet so that a collective unstable mode is excited. In this mode, the beam generates coherent radiation whose wavelength is determined by the undulator period and the electron energy. By proper choice of the electron-beam energy, energy dispersion, and density, one can obtain coherent radiation in the soft-X-ray region with peak and average power of the order of hundreds of megawatts and hundreds of milliwatts, respectively. Larger peak powers, of the order of a gigawatt, can be expected for UV radiation with lambda in the range of 500-2000 AA. The authors discuss the physical principles of these systems and give examples of how they might be built. (14 References). |
| keywords: | |
|
Download | View | Details | edit | delete |
|
| title: | Free electron lasers for the XUV spectral region |
| format: | conference procceeding |
| conference: | 6th International Free Electron Laser Conference |
| year: | 1985 |
| 2 authors: | | |
| abstract: | The generation of high intensity coherent radiation in the soft X-ray region from a free electron laser will require the FEL to operate in the high gain or collective instability regime. In this mode of operation, which does not require a cavity resonator, the radiation field grows exponentially along the undulator until nonlinear effects bring on saturation. The authors discuss the conditions that the electron beam and the undulator must satisfy for the collective instability to develop. They present an example of an electron storage ring with an undulator in a bypass section which satisfies these conditions. They present estimates of the output power that one can expect from such systems. (25 References). |
| keywords: | |
|
Download | View | Details | edit | delete |
|