Particle Accelerators 

About: Particle Accelerators is an academic journal. The journal publishes majorly in the area(s): Beam (structure) & Particle accelerator. It has an ISSN identifier of 0031-2460. Over the lifetime, 270 publications have been published receiving 5036 citations.

Superfish-a Computer Program for Evaluation of RF Cavities with Cylindrical Symmetry

Abstract: The difference equations for axisymmetric fields are formulated in an irregular triangular mesh, and solved with a direct, noniterative method. This allows evaluation of resonance frequencies, fields, and secondary quantities in extreme geometries, and for the fundamental as well as higher modes. Finding and evaluating one mode for a 2000 point problem takes of the order of 10 sec on the CDC 7600.

Generating of coherent radiation by a relativistic electron beam in an ondulator

Abstract: A detailed study of the self-modulation of a relativistic electron beam in an ondulator in the single-pass regime is carried out. Beam-parameter conditions are obtained under which the radiative instability in question occurs. The possibility of constructing a source of coherent radiation based on this principle is discussed. The radiation spec­ ifications of such a source are analyzed. Control the mass of longitudinal motion with the help of an additional longitudinal magnetic field introduced in the ondulator is discussed. Numerical examples are given for sources of submillimeter and infrared-range radiation.

Differential Algebraic Description of Beam Dynamics to Very High Orders

Abstract: The coordinates z contain positions and momenta of the particle. The vector b contains other parameters that influence the motion such as particle energy, mass, or charge or accelerator parameters such as certain multipole strengths. From this map \"u, quantities of interest for accelerators, such as tune shifts and chromaticities, can be extracted. This is described in detail in a companion paper. 1

Beam Loading in Plasma Accelerators

Abstract: Acceleration of particles in high-phase-velocity plasma waves is attractive because of the extremely high accelerating gradients that can be obtained. 3 However, a high gradient is only one important benchmark for an accelerator. It is also important to know how many particles can be accelerated (i.e., luminosity), what will be the beam quality (i.e., emittance), and what will be the overall efficiency of the device. In this paper, we address these issues for plasma-wave accelerators. The results apply to both the beat-wave ,4 and wake-field,s,6 accelerator schemes. Previous work by R. Ruth et al. 5 has addressed emittance matching in plasma wake fields driven by unshaped electron bunches. S. Van der Meer? has considered specialized shaping of an accelerated beam to reduce its energy spread. Here we consider simultaneously the constraints on emittance and energy spread. These lead to quantitative estimates of the maximum number of particles that can be accelerated in plasma waves and the resulting efficiency. We augment the analysis with self-consistent particle-in-cell computer simulations. In order to find the maximum number of particles that can be accelerated by a plasma wave, we first review the wake field generated by a relativistic chargedparticle bunch of arbitrary shape (Section 2). The beam-loading problem can then be analyzed by applying linear superposition of the bunch wake field and the accelerating plasma-wave field. This is done for a one-dimensional approximation in Section 3 and for three dimensions in Section 4.