Single-Particle Beam Dynamics and Optics


Paper Title Page
MPPE071 Einstein's General Relativity Effects on Beam Dynamics in a Storage Ring 3834
  • D. Dong, C.G. Huang, Z. Zusheng
    IHEP Beijing, Beijing
  Funding: The work is supported by National Science Foundation of China under Grant No. 10475094.

In this paper we will discuss Einstein's tide force predicted by Einstein's general relativity, how the new tide force would affect the beam orbits in a storage ring, and how to pick up and recognize it from the beam signals in a storage ring. The result shows this effect can be accumulated by the charged particle beam in a storage ring, it is a very interesting result.

MPPE073 Effects of the Passive Harmonic Cavity on the Beam Bunch 3904
  • L.-H. Chang, M.-C. Lin, C. Wang, M.-S. Yeh
    NSRRC, Hsinchu
  In this paper, we present a computer tracking code, which can investigate the bunch length, energy spread and the critical current of Robinson instability under the influence of the passive harmonic cavity. The effects of the radiation damping, quantum excitation and the beam loading of the harmonic cavity are included in the computation. The calculated result shows that the beam has a constant energy spread and blows up as the beam current increases from below to over the threshold current of the Robinson instability. It also indicates that the shunt impedance of the harmonic cavity is critical for whether the harmonic cavity can reach the designed goal, a stable and lengthening beam at the design beam current.  
MPPE076 Design Study on a New Separator for PEEM3 3985
  • W. Wan, J. Feng, H.A. Padmore
    LBNL, Berkeley, California
  Funding: Work supported by the Director, Office of Energy Research, Office of Basic Energy Science, Material Sciences Division, U.S. Department of Energy, under Contract No. DE-AC03-76SF00098.

A new aberration-corrected Photoemission Electron Microscope, called PEEM3, is under development at the Advanced Light Source. The resolution and transmission improvement is realized by correcting the lowest order spherical and chromatic aberrations using an electron mirror. A separator is required to separate the incoming uncorrected electron beam to the mirror from the corrected outgoing electron beam to the projector column. In this paper, we present a design study of a new separator for PEEM3. The layout, the Gaussian optics, the analysis of aberrations and the tolerance on power supply stability and alignment errors are reported.

MPPE080 Transversal Deflection of Electrons Moving in Parallel with Linearly Polarized Laser Beam and its Application 4054
  • D.A. Zakaryan, D.K. Kalantaryan
    YSU, Yerevan
  • E.D. Gazazyan, K.A. Ispirian, M.K. Ispirian
    YerPhI, Yerevan
  The motion of electrons in linearly polarized laser beams in a finite length interaction region and after in a field free drift length is investigated. It is shown that in the interaction region the trajectory of the electrons is almost straight lines with very small oscillation weakly depending on the laser intensity. In the drift region the electrons acquire significant transversal deflection that allows to carry out the measurement of the length and longitudinal particle distribution of femtosecond bunches. The dependence of this deflection upon the electron energy, interaction region length, etc is studied. The principles of the construction of femtosecond oscilloscopes are discussed.  
MPPE081 The Comparison of a New Beam-Tracking Code to the Acceleration Test 4072
  • K. Yamamoto, S. Yamada, K. Yamamoto
    NIRS, Chiba-shi
  • T. Hattori
    RLNR, Tokyo
  • M. Okamura
    RIKEN, Saitama
  A new beam-tracking code using a 3D electro-magnetic field map of a linac is being developed. In this code, beam dynamics including non-linear and dipole effects can be easily estimated based on simulated field maps provided by commercial 3D analysis software. To verify the code, we manufactured an IH-linac and acceleration test of the linac was carried out with proton beam. The simulated results were compared with the tested acceleration performances.  
MPPE082 Non-Linear Beam Dynamics in High Resolution Multi-Pass Time of Flight Mass Separator 4105
  • V.A. Shchepunov
    ORAU, Oak Ridge, Tennessee
  • H. Wollnik
    JIHIR, Oak Ridge, Tennessee
  Funding: This work was supported by the UNIRIB collaboration and Oak Ridge Associated Universities.

A multi-pass time-of-flight (MTOF) mass separator is under development by the UNIRIB collaboration. The MTOF consists of two coaxial electrostatic mirrors, focusing lenses and auxiliary injection, extraction and separation elements. The injected ions having almost the same energy but different masses undergo hundreds or thousands of reflections between the mirrors. In the course of this periodic motion, the ions of different masses and hence velocities are spatially separated in longitudinal direction. The periodic motion in the MTOF has been investigated with a recently developed ray tracing program utilizing the canonical integration technique. Results of the performed numerical simulations are discussed. The simulations displayed nonlinear character of the ion’s behavior both in transverse and longitudinal phase spaces. The ion’s transverse stability and longitudinal isochronicity were the matters of primary attention. It is shown in particular that at transverse tunes of around q=0.75 the system can be adjusted to be isochronous up to at least the 3rd order of the ToF optical aberrations.

MPPE083 Harmonic Decomposition of Orbit Data for Multipole Analysis 4120
  • M.-J. Yang
    Fermilab, Batavia, Illinois
  The unprecedented position resolution provided by the newly commissioned Recycer BPM system is opening up a new chapter of beam based multipole analysis at Fermilab. The closed orbit data, taken with circulating beam and averaged over many consecutive turns, has been shown to have the resolution of a few microns. The result of polynomial fit to BPM position data, as a function of dipole kick sizes, is used to separate orbit data into first, second, and third order. Combining both the in-plane and cross-plane orbit data it is possible to determine the multipole content within each half cell. This paper presents the algorithm behind the procedure, the data collected from the Fermilab Recycler Ring, and the final analysis result.  
MPPT077 Radiation of Electron in the Field of Plane Light Wave 3997
  • A.Y. Zelinsky, I.V. Drebot, Yu.N. Grigor'ev, O.D. Zvonarjova
    NSC/KIPT, Kharkov
  • R. Tatchyn
    SLAC, Menlo Park, California
  In the work the process of electron interaction with field of oncoming light wave (Compton scattering) has been considered with methods of classical electrodynamics. As results of Lorenz equation integration the trajectories of electron motion in the wave field were derived. On the base of obtained results the expressions for electron radiation spectrum were produced.In the work dependences of spectrum shape on electron and photon beams parameters are analyzed.