T
Timothy J.P. Ellison
Researcher at Indiana University
Publications - 45
Citations - 251
Timothy J.P. Ellison is an academic researcher from Indiana University. The author has contributed to research in topics: Beam (structure) & Electron cooling. The author has an hindex of 7, co-authored 45 publications receiving 244 citations.
Papers
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Journal ArticleDOI
Driven response of the synchrotron motion of a beam.
M. Ellison,M. Ball,B. B. Brabson,J. Budnick,D. D. Caussyn,Alex Chao,J. Collins,S. A. Curtis,V. Derenchuk,S. Dutt,G. East,Timothy J.P. Ellison,D.L. Friesel,W. Gabella,B. Hamilton,H. Huang,W.P. Jones,W. Lamble,S. Y. Lee,Derun Li,M.G. Minty,S. Nagaitsev,King Yuen Ng,X. Pei,G. Rondeau,T. Sloan,Michael Syphers,S. Tepikian,Y.T. Yan,P.L. Zhang +29 more
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.
Journal ArticleDOI
Experimental studies of nonlinear beam dynamics
D. D. Caussyn,M. Ball,B. B. Brabson,J. Collins,S. A. Curtis,V. Derenchuck,D. DuPlantis,G. East,M. Ellison,Timothy J.P. Ellison,D.L. Friesel,B. Hamilton,W.P. Jones,W. Lamble,S. Y. Lee,Derun Li,M. G. Minty,T. Sloan,G. Xu,A. W. Chao,King Yuen Ng,S. Tepikian +21 more
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.
Journal ArticleDOI
Experimental determination of a nonlinear Hamiltonian in a synchrotron.
S. Y. Lee,M. Ball,B. B. Brabson,D. D. Caussyn,J. Collins,S. A. Curtis,V. Derenchuck,D. DuPlantis,G. East,M. Ellison,Timothy J.P. Ellison,D.L. Friesel,B. Hamilton,W.P. Jones,W. Lamble,Derun Li,M. G. Minty,P. Schwandt,T. Sloan,G. Xu,A. W. Chao,S. Tepikian,King Yuen Ng +22 more
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.
Journal ArticleDOI
Spin flipping a stored polarized proton beam.
D. D. Caussyn,Ya. S. Derbenev,Timothy J.P. Ellison,S. Y. Lee,T. Rinckel,P. Schwandt,F. Sperisen,E. J. Stephenson,B. von Przewoski,Boris Blinov,C. M. Chu,E. D. Courant,D. A. Crandell,W. A. Kaufman,A. D. Krisch,T. S. Nurushev,R. A. Phelps,L. G. Ratner,Victor K. Wong,Chihiro Ohmori +19 more
TL;DR: This study studied the spin flipping of a vertically polarized, stored 139-MeV proton beam and found a polarization loss of 0.0000[plus minus]0.0005 per spin flip under the best conditions; this loss increased significantly for small changes in the conditions.
Journal ArticleDOI
Experimental study of synchro-betatron coupling induced by dipole modulation
Michael Syphers,M. Ball,B. B. Brabson,J. Budnick,D. D. Caussyn,Alex Chao,J. Collins,V. Derenchuk,S. Dutt,G. East,M. Ellison,Timothy J.P. Ellison,D.L. Friesel,W. Gabella,B. Hamilton,H. Huang,W.P. Jones,S. Y. Lee,Derun Li,M.G. Minty,S. Nagaitsev,King Yuen Ng,X. Pei,G. Rondeau,T. Sloan,L. Teng,S. Tepikian,Yan Alexander Wang,Y.T. Yan,P.L. Zhang +29 more
TL;DR: Synchro-betatron coupling in a proton storage ring with electron cooling was studied experimentally by modulating a transverse dipole field close to the synchrotron frequency and the combination of the electron cooling and transverse field modulation is equivalent to a dissipative parametric resonant system.