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D.L. Friesel

Bio: D.L. Friesel is an academic researcher from Indiana University. The author has contributed to research in topics: Cyclotron & Betatron. The author has an hindex of 13, co-authored 69 publications receiving 550 citations.


Papers
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Journal ArticleDOI
TL;DR: Experimental data revealed island structure in longitudinal phase space in synchrotron motion excited by phase modulation at the third harmonic of the syn chrotron frequency.
Abstract: Synchrotron motion with rf phase modulation was studied experimentally. Poincare maps in the resonant precessing frame were obtained from the experimental data and compared with the tori of the resonant Hamiltonian. Our experimental data revealed island structure in longitudinal phase space. Experimental results for synchrotron motion excited by phase modulation at the third harmonic of the synchrotron frequency are also reported.

38 citations

Journal ArticleDOI
TL;DR: In this paper, the synchroton motion of a beam was tracked by digitizing the phase of the beam signal from a high bandwidth wall gap monitor relative to the rf phase and the momentum deviation with a transverse beam position measurement in a high dispersion region.
Abstract: The synchroton motion of a beam was tracked for the first time by digitizing the phase of the beam signal from a high bandwidth wall gap monitor relative to the rf phase and the momentum deviation with a transverse beam position measurement in a high dispersion region. The measured synchrotron tune as a function of the synchrotron amplitude agrees well with theory. When the rf stable phase angle was modulated harmonically, the response of the synchrotron motion showed characteristics of chaos and bifurcations of a parametric resonant system. Manipulating the rf system to create islands in the synchrotron phase space may offer applications in future hadron colliders.

37 citations

Journal ArticleDOI
TL;DR: Differential cross sections have been measured for the elastic and inelastic scattering of 135 MeV protons from 12C using a distorted wave approximation with various microscopic model nuclear structure transition densities and free and density-dependent two-nucleon t-matrices as discussed by the authors.

32 citations

Journal ArticleDOI
TL;DR: The nonlinear beam dynamics of transverse betatron oscillations were studied experimentally at the Indiana University Cyclotron Facility cooler ring and the Hamiltonian for nonlinear particle motion near the third- and fourth-integer-resonance conditions has been deduced.
Abstract: The nonlinear beam dynamics of transverse betatron oscillations were studied experimentally at the Indiana University Cyclotron Facility cooler ring. Motion in one dimension was measured for betatron tunes near the third, fourth, fifth, and seventh integer resonances. This motion is described by coupling between the transverse modes of motion and nonlinear field errors. The Hamiltonian for nonlinear particle motion near the third- and fourth-integer-resonance conditions has been deduced.

31 citations

Journal ArticleDOI
TL;DR: The nonlinear beam dynamics of transverse betatron oscillators were studied experimentally at the Indiana University Cyclotron Facility Cooler Ring and the Hamiltonian of particle motion near a resonance condition was deduced.
Abstract: The nonlinear beam dynamics of transverse betatron oscillators were studied experimentally at the Indiana University Cyclotron Facility Cooler Ring. Particles were kicked onto resonance islands and the properties of these islands were studied. The island tune was determined with high precision by Fourier analyzing the spectrum containing the island oscillations. The island width was estimated based on a single-resonance model. The Hamiltonian of particle motion near a resonance condition was thus deduced.

29 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the authors provide an overview of recent experimental and theoretical developments in the area of optical discrete solitons, which represent self-trapped wavepackets in nonlinear periodic structures and result from the interplay between lattice diffraction (or dispersion) and material nonlinearity.

973 citations

Journal ArticleDOI
TL;DR: A review of the evidence on the properties of the nuclei A = 8, 9 and 10, with emphasis on material leading to information about the structure of the A =8, 9, 10 systems is given in this paper.

643 citations

Journal ArticleDOI
TL;DR: In this article, the experimentally determined properties of energy levels of A = 21−44 nuclei are compiled and evaluated with emphasis on nuclear spectroscopy, and the available information on excitation energies, spins, parities, isospins, lifetimes or widths and observed decay is summarized in a master table.

593 citations

Journal ArticleDOI
TL;DR: This version of A = 9 differs from the published version in that it has corrected some errors discovered after the article went to press and reference key numbers have been changed to the NNDC/TUNL format.

571 citations

01 Jan 2008
TL;DR: A = 14 was published in Nuclear Physics A152 (1970), p. 1. This version of A = 14 differs from the published version in that we have corrected some errors discovered after the article went to press as mentioned in this paper.
Abstract: An evaluation of A = 13–15 was published in Nuclear Physics A152 (1970), p. 1. This version of A = 14 differs from the published version in that we have corrected some errors discovered after the article went to press. Figures and introductory tables have been omitted from this manuscript. Reference key numbers have been changed to the NNDC/TUNL format. (References closed December 31, 1969) The original work of Fay Ajzenberg-Selove was supported by the US Department of Energy [DE-AC02-76-ER02785]. Later modification by the TUNL Data Evaluation group was supported by the US Department of Energy, Office of High Energy and Nuclear Physics, under: Contract No. DEFG05-88-ER40441 (North Carolina State University); Contract No. DEFG05-91-ER40619 (Duke University). Nucl. Phys. A152 (1970) 1 A = 14 Table of

372 citations