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Last Name: Sessler
Full Name: Sessler, A. M.
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6 papers
| title: | Short wavelength FELs using the SLAC linac |
| format: | journal article |
| year: | 1994 |
| 30 authors: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| abstract: | We have studied the use of the SLAC linac to drive FELs at wavelengths down to a few angstroms. Lasing would be achieved in a single pass of a low emittance, high peak current, high energy eelctron beam through a long undulator by Self-Amplified-Spontaneous-Emissin (SASE). About 10(13) photons per pulse can be produced in 100 fs pulses at a 120 Hz rate, corresponding to brightness levels of about 10(22) average and 10(32) peak. Peak power levels are tens of GW. Electron energies of 10-20 GeV are required. Signifcant imporvement of FEL performance seems possible using harmonic generation techniques according to results from numerical simulations. |
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| title: | Beam break-up in the two-beam accelerator |
| format: | conference procceeding |
| conference: | 1989 Particle Accelerator Conference |
| year: | 1989 |
| 5 authors: | | | | | |
| abstract: | Beam breakup (BBU) in the drive beam of a two-beam accelerator (TBA) using transverse wakes calculated by the AMOS code was studied numerically. Only cumulative BBU due to the wake of the linear induction accelerator cavities is considered. Growth lengths on the order of approximately 100 m are found for typical parameters. It is concluded that these growth lengths are acceptable for a future TBA. (14 References). |
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| title: | Diffraction radiation defocussing of an electron ring |
| format: | unknown |
| year: | 1971 |
| 3 authors: | | | |
| abstract: | The influence upon axial stability in an electron ring of the diffraction radiation reaction force, generated by a ring moving in an acceleration column, is calculated theoretically. A stability criterion is obtained, and numerical examples show that the criterion is not an important constraint upon the choice of parameters or the operation of an electron ring accelerator. |
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| title: | The equilibrium length of high-current bunches in electron storage rings |
| format: | unknown |
| year: | 1971 |
| 2 authors: | | |
| abstract: | The consequence of electrical interaction with various resonant structures is expressed in terms of quadratures over the impedance of the structures, and impedance functions for a variety of elements are evaluated. It is shown that elements having resonances at high frequency can, above transition, cause bunches to increase in length with increasing current. The parametric dependence of the bunch lengthening is found to be in good agreement with observations, and numerical estimates, which are in substantial agreement with experiment are presented. (16 References). |
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| title: | Crossing of an incoherent integral resonance in the electron ring accelerator |
| format: | unknown |
| year: | 1970 |
| 2 authors: | | |
| abstract: | In one mode of operation of an electron ring accelerator (ERA), at the end of compression rings are slowly moved through the radial integral betatron resonance Q_r=1. Although the coherent radial oscillation frequency of the ring as a whole remains below unity, the oscillation frequencies of individual electron are (incoherently) caused to pass through the resonance because of the additional focusing from ions trapped in the ring. In this paper the effect of field errors on ring major and minor radii is evaluated-theoretically-for the cases in which the spread in the square of the electron oscillation frequency ( Delta(2)) is (a) much smaller and (b) much larger than the contribution to the square of the oscillation frequency from the ions ( Lambda(2)). |
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| title: | Physics with and physics of colliding electron beams |
| format: | unknown |
| year: | 1970 |
| 2 authors: | | |
| abstract: | The first section of this article deals with the physics that can be done with colliding beams. Experiments which have been already performed and those planned for the future are reviewed. The second section discusses the physics of colliding electron ring devices. |
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