First Name: J
Middle Name: C
Last Name: Gallardo
Full Name: J. C. Gallardo
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6 papers
| title: | 40 Angstrom FEL designs for the PEP storage ring |
| format: | conference procceeding |
| conference: | 13th International Free Electron Laser Conference |
| year: | 1992 |
| 6 authors: | | | | | | |
| abstract: | Explores the use of the 2.2 km PEP storage ring at SLAC to drive a 40 angstrom free-electron laser in the self-amplified spontaneous emission configuration. Various combinations of electron-beam and undulator parameters, as well as special undulator designs, are discussed. Saturation and high peak, in-band, coherent power (460 MW) are possible with a 67 m, hybrid permanent-magnet undulator in a ring bypass. A 100 m, cusp-field undulator can achieve high average, in-band, coherent power (0.25 W) in the main ring. The existing, 25.6 m Paladin undulator at LLNL, with the addition of optical-klystron dispersive sections, is considered for both peak and average power. (35 References). |
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| title: | Short wavelength FELs on large storage rings |
| format: | conference procceeding |
| conference: | 7th National Conference on Synchrotron Radiation Instrumentation |
| year: | 1992 |
| 6 authors: | | | | | | |
| abstract: | The use of a large-circumference, high-energy, electron-positron collider such as PEP, TRISTAN or PETRA to drive a free-electron laser (FEL), producing high levels of coherent power at short wavelengths around 40 AA is explored. The authors consider self-amplified spontaneous emission (SASE), in which electron bunches with low emittance, high peak current and small energy spread radiate coherently in a single pass through a long undulator. As the electron beam passes down the undulator, its interaction with the increasingly intense spontaneous radiation causes a bunch density modulation at the optical wavelength, resulting in stimulated emission and exponential growth of coherent power in a single pass. The need for optical-cavity mirrors, which place a lower limit on the wavelength of a conventional FEL oscillator, is avoided. Various combinations of electron-beam and undulator parameters, as well as special undulator designs, are discussed. Saturation and high peak, in-band, coherent power (460 MW) are possible with a 67 m, hybrid permanent-magnet undulator in a ring bypass. A 100 m, cusp-field undulator can achieve high average, in-band, coherent power (0.25 W) in the main ring. The existing, 25.6 m Paladin undulator at LLNL, with the addition of optical-klystron dispersive sections, is considered for both peak and average power. |
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| title: | Coherent X-rays from PEP |
| format: | conference procceeding |
| conference: | 1991 Particle Accelerator Conference |
| year: | 1991 |
| 7 authors: | | | | | | | |
| abstract: | The authors explore the use of a large-circumference, high-energy electron-positron collider such as PEP to drive a free-electron laser (FEL), producing high levels of coherent power at short wavelengths. They consider self-amplified spontaneous emission (SASE), in which electron bunches with low emittance, high peak current, and small energy spread radiate coherently in a single pass through a long undulator. The authors also explore various combinations of electron-beam and undulator parameters, as well as special undulator designs and optical klystrons (OKs), to reach high average or peak coherent power at wavelength around 40 AA by achieving significant exponential gain or full saturation. Examples are presented for devices that achieve high peak coherent power (up to about 400 MW) with lower average coherent power (about 20 mW) and other devices which produce a few watts of average coherent power. (22 References). |
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| title: | Optical klystron configuration for a high gain X-ray free-electron laser |
| format: | unknown |
| year: | 1990 |
| 2 authors: | | |
| abstract: | The authors present theory and numerical simulations of the performance of an X-ray free-electron laser in the amplified spontaneous emission mode with an optical klystron undulator configuration. This device can produce picosecond pulses of high brightness with a significantly shorter undulator than a conventional FEL. (13 References). |
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| title: | Optical-Klystron configuration for a high-gain X-ray free electron laser |
| format: | conference procceeding |
| conference: | 11th International Free Electron Laser Conference |
| year: | 1990 |
| 2 authors: | | |
| abstract: | Presents the theory and numerical simulations of the performance of an X-ray free electron laser in the amplified spontaneous-emission mode with an optical-klystron undulator configuration. This device can produce picosecond pulses of high brightness with a significantly shorter undulator than a conventional FEL. (10 References). |
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| title: | Theory of a free-electron laser with a Gaussian optical undulator |
| format: | unknown |
| year: | 1988 |
| 4 authors: | | | | |
| abstract: | A theoretical study of the possibility of a free-electron laser in the XUV and soft X-ray region of the spectrum, using a counterpropagaing CO/sub 2/ laser beam as an undulator, is presented. A one-dimensional model is used to evaluate the single-pass power gain of such a device. The detrimental effects due to the energy speed, emittance of the electron beam, and the diffraction of the electromagnetic undulator are explicitly incorporated in the formalism. An oscillator experiment is also considered. The solutions of the optical pulse evolution equation in the weak field, low gain, and long-electron-pulse regimes are all derived. (27 References). |
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