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THOBFI — Beam Instrumentation and Feedback 29-Jun-06 11:30 - 12:30 of the spin precession frequency line (∼5x10-7,) due to scattering of particle trajectories about the equilibrium orbit in a non-linear field of the storage ring, was presumably observed in experiments. We proposed and realized an RF scheme for controlled separation of the spin precession frequencies of two electron bunches; the first measurements using this scheme were made. Chair: M.C. Ross (SLAC, Menlo Park, California) 385
THPCH001 THPCH002 THPCH003 29-Jun-06 16:00 - 18:00 THPCH — Poster Session THPCH — Poster Session Nonlinear Stability in the Transport of Mismatched Beams in a Uniform Focusing Field A nonlinear stability analysis of mismatched R. Pakter, F.B. Rizzato, W. Simeoni (IF-UFRGS) breathing beams considering nonaxysymmetric perturbations is performed. It is shown that breathing oscillations of an initially quasi-round beam may nonlinearly induce quadrupole-like oscillations, with a possible increase of the beam size along one direction. A simple model for the nonlinear coupling is developed to clarify the instability mechanism. Growth rates are determined and compared to that of other instabilities that affect mismatched beams, such as halo formation. Self-consistent simulations with different beam loading distributions are used to verify the findings. Combined Centroid-envelope Dynamics of Intense, Magnetically Focused Charged Beams Surrounded by Conducting Walls This paper analyses the combined envelope- F.B. Rizzato, K. Fiuza, R. Pakter (IF-UFRGS) centroid dynamics of magnetically focused high-intensity charged beams surrounded by conducting walls. Similarly to the case were conducting walls are absent*, we show that the envelope and centroid dynamics decouples from each other. Mismatched envelopes still decay into equilibrium with simultaneous emittance growth, but the centroid keeps oscillating with no appreciable energy loss. Some estimates are performed to analytically obtain some characteristics of halo formation seen in the full simulations. *Moraes et al. Phys. Rev. Lett. 93, 244801 (2004). Influence of Beam-Breakup Instabilities on Electron Focusing M. Caron, F. Cartier, D.C. Collignon, L.H. Hourdin, M. Mouillet, D.P. Paradis, N. Pichoff (CEA) 386 High intensity electron beam focusing is a key issue for the successful development of flash radiography at hydro test facilities. AIRIX is a 2 kA, 19 MeV, 60 ns, single shot linear accelerator that produces X-rays from the interaction between relativistic electrons and a Tantalum solid target (Ta). In that emittance dominated process, different physical mechanisms can limit the end focusing of the intense electron beam on Ta. In the present paper, the role of the beam break-up (BBU) instabilities is pointed out. The theory of BBU for induction linacs has been developed for quite some time. For an accelerating beam with steady state radial oscillations at the accelerator entrance, the theoretical prediction regarding the amplitude growth after n successive cavities agrees with the experimental observations. Therefore, as a result of the subsequent emittance growth a spot size enlargement would be expected. As a matter of fact, we found out experimentally that no direct correlation can be drawn up between BBU growth and focal spot dimensions over the range of transverse beam motion investigated. This finding gives now new orientations on the way to reduce the spot size.
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Contents MOXPA — Linear Colliders
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Contents MOPCH056 Development of Hi
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Contents MOPCH140 Compensation of L
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Contents MOPLS020 Rad-hard Luminosi
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Contents MOPLS102 Beam Dynamic Stud
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TUOCFI — Accelerator Technology C
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Contents TUPCH074 Fast and Precise
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Contents TUPCH159 High Power Wavegu
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Contents TUPLS039 Proposal of a Nor
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Contents TUPLS127 Permanent Deforma
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Contents WEPCH020 Extending the Lin
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Contents WEPCH108 FFAG Computation
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Contents WEPCH192 Compact Electron
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Contents WEPLS078 Design Study of t
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THOPA — Synchrotron Light Sources
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Contents THPCH042 Numerical Estimat
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Contents THPCH124 Visual Programmin
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Contents THPLS008 Commissioning of
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Contents THPLS099 Fast Kicker Syste
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MOXPA — Linear Colliders, Lepton
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MOYBPA — Circular Colliders 26-Ju
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MOZBPA — Synchrotron Light Source
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MOPCH — Poster Session 26-Jun-06
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WEYPA — Linear Colliders, Lepton
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WEOAPA — Linear Colliders, Lepton
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WEXFI — Beam Dynamics and Electro
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WEOFI — Beam Dynamics and Electro
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WEPCH — Poster Session 28-Jun-06
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FRYCPA — Beam Instrumentation and
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Amro, A. THPLS043 An, D.H. TUPCH070
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Bates, D.A. WEPCH150 Battaglia, D.
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Bondarenko, A.V. MOPCH057, MOPCH073
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Campmany, J. THPLS053, THPLS134, TH
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Chung, C.C. TUPCH105 Chung, C.W. TU
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Della Mea, G. TUPLS016 Della Penna,
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THPLS119 Ellison, J.A. WEPCH144, TH
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Frisch, J.C. MOPLS081, TUYPA02, TUP
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Grabosch, H.-J. THPLS103 Gräf, H.-
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WEPCH095 Hershcovitch, A. TUPLS103
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Ischebeck, R. WEOAPA01 Ishi, Y. WEP
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WEPLS043, MOPLS080 Kan, K. WEPLS054
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Klein, R. THPLS013, THPLS014, THPLS
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Kurdi, G. WEPLS059 Kurennoy, S.S. T
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Lin, F. MOPCH100 Lin, F.-Y. THPCH18
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Mariette, C. THPLS102 Marinkovic, G
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Miyahara, Y. THPCH048 Miyajima, T.
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Neuenschwander, R.T. WEPCH005, THPC
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Owens, P.H. THPCH113 Oyaizu, M. TUP
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Plate, D.W. THPLS114 Plesko, M. WEI
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Reiche, S. MOPCH028, WEPCH150 Reich
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Saewert, G.W. TUPLS069 Safranek, J.
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TUPCH050, THPCH150 Schriber, H.J. W
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Simos, N. MOPCH138, TUPLS133, WEPCH
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Sun, Y. MOPLS089 Surrow, B. MOPLS05
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Tobiyama, M. MOPLS033, TUPCH057, WE
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van Oudheusden, T. MOPCH058, MOPCH0
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TUPCH083 Welton, R.F. MOPCH129, TUP
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Yurkov, M.V. TUPCH081, THPLS133 Yus
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