IEEE Particle Accelerator Conference 

About: IEEE Particle Accelerator Conference is an academic conference. The conference publishes majorly in the area(s): Beam (structure) & Particle accelerator. Over the lifetime, 5194 publications have been published by the conference receiving 21265 citations.

The MAD program

Abstract: The Methodical Accelerator Design (MAD) program for circular accelerators is in regular use for the design and modeling of the Large Electron Positron Collider (LEP), the Large Hadron Collider (LHC), the Proton Synchrotron (PS), and the Super Proton Synchrotron (SPS) at CERN, and in 10 to 20 other laboratories. It includes the following new accelerator physics features: (i) machine imperfections, e.g. random and systematic errors in the alignment and excitation of the magnetic elements and read-out errors of the beam-position monitors; (ii) closed-orbit correction using the MICADO algorithm; (iii) Lie-algebraic techniques for concatenating beam lines, for tracking trajectories, and for higher-order orbit functions; (iv) systematic energy loss due to synchrotron radiation and its effects on the closed orbit and the orbit functions in all three degrees of freedom; and (v) spin dynamics in SMILE style. The data describing the machine are held as data modules in a dynamically managed memory pool, including garbage collection and overflow onto external files. Graphics is interfaced to the standard graphics kernel system (GKS) and used for plotting orbit functions along the orbit and versus the momentum error, and for phase space plots, Fourier spectra of particle orbits, etc. MAD is implemented on Cray, IBM, Nord, and VAX systems and on Apollo and sun workstations. >

Design optimization for an X-ray free electron laser driven by SLAC linac

Abstract: I present a design study for an X-ray Free Electron Laser (FEL) driven by the SLAC linac. The study assumes the FEL is based on Self-Amplified Spontaneous Emission (SASE) and lasing is achieved in a single pass of a high current, high brightness electron beam through a long wiggler. Following a brief review of the fundamentals of SASE, I provide without derivation a collection of formulas relating SASE performance to the system parameters. These formulas allow quick evaluation of FEL designs and provide powerful tools for optimization in multidimensional parameter space. Optimization is carried out for the SLAC FEL over all independent system parameters modeled, subjected to a number of practical constraints.

Magnetic optics for proton radiography

Abstract: High energy protons of 10 to 50 GeV can be used to radiograph dense objects. Because the transmitted beam particles undergo multiple Coulomb scattering (MCS) in the object, a magnetic lens system is used to focus the particles exiting each point of the object onto a distant image plane. Without the lens, the MCS would seriously blur the radiographic image. Correlations can be introduced in the illuminating beam to cancel a major part of the chromatic and geometric aberrations in the lens, while providing locations inside the lens where the rays are sorted by MCS angle. This allows the introduction of angle cut apertures to aid material identification. The requirement for a matched multistage lens system with successively smaller angle-cut apertures leads to the use of minus-identity (-I)lenses, in which the angle sorting is in the longitudinal mid plane of the lens, and the exit beam correlations are the same as the input correlations. A single stage-I lens has been successfully tested at Brookhaven with 10-GeV protons and another is being used in dynamic experiments with 0.8-GeV protons at Los Alamos. The resolution achievable at higher energies is briefly surveyed.

G4beamline simulation program for matter-dominated beamlines

Abstract: G4beamline is a single-particle simulation program optimized for the design and evaluation of beam lines. It is based on the Geant4 toolkit, and can implement accurate and realistic simulations of particle transport in both EM fields and matter. This makes it particularly well suited for studies of muon collider and neutrino factory design concepts. G4beamline includes a rich repertoire of beamline elements and is intended to be used directly, without C++ programming, by accelerator physicists. The program has been enhanced to handle a large class of beamline and detector systems, and is available on Linux, Windows, and Macintosh platforms.

Analysis of multipacting in coaxial lines

Abstract: Multipacting can cause breakdown in high power rf components like couplers, windows, etc. This phenomenon starts if certain resonant conditions for electron trajectories are fulfilled and if the impacted surface has a secondary yield larger than one. A general cure against multipacting is to avoid the resonant conditions. Therefore we investigated the dynamics of the electron trajectories in order to find rules for these resonances and thus suppress multipacting by appropriate design. We developed a new code which combines standard trajectory calculations with advanced searching and analyzing methods for multipacting resonances. As a first step, coaxial power lines are investigated. We characterize multipacting behavior in straight and tapered lines and give scaling laws with respect to dimension, frequency and impedance. The calculations are compared with experimental observations.