The formation of the beam halo in charged particle accelerators is studied in the framework of a stochastic-hydrodynamic model for the collective motion of the particle beam. In such a stochastichydrodynamic theory the density and the phase of the charged beam obey a set of coupled nonlinear hydrodynamic equations with explicit time-reversal invariance. This leads to a linearized theory that de...

High-power proton linacs like the 800-MeV LANSCE accelerator typically use a physics-based approach and online single-particle and envelope beam dynamics models to establish nominal set points for operation. However, these models are not good enough to enable immediate transition to high-power operation. Instead, some amount of empirical adjustment is necessary to achieve stable, low beam-loss ...

To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up effect. In this paper, we use a two-particle model to examine the relative magnitudes of the various orbit and dispers...

Beam dynamics issues affect many different aspects of the SLC performance. This paper concentrates on the multi-particle beam dynamics in the linac and the associated limitations that are imposed on the overall SLC performance. The beam behavior in the presence of strong wakefields has been studied in order identify ways to optimize the performance and to predict the expected emittances in high...

Charged-particle motion is studied in the self-electric and self-magnetic fields of a well-matched, intense charged-particle beam and an applied periodic solenoidal magnetic focusing field. The beam is assumed to be in a state of adiabatic thermal equilibrium. The phase space is analyzed and compared with that of the well-known Kapchinskij-Vladimirskij (KV)-type beam equilibrium. It is found th...

Vacuum ballistic focusing may be a straightforward method to obtain the heavy ion beam spot size necessary to drive an inertial confinement fusion target. Proper scaling of particle energy, mass, beam current, beam emittance, and magnetic field replicates the dynamics of a full driver beam in a small laboratory experiment. By expanding the beam and then focusing to a very small spot, the effect...

In this paper, by using an analogy among quantum mechanics, electromagnetic beam optics in optical fibers, and charge particle beam dynamics, we introduce the concept of coherent states for charged particle beams in the framework of the Thermal Wave Model (TWM). We give a physical meaning of the Gaussian-like coherent structures of charged particle distribution that are both naturally and artif...

We present the recent STAR results on the production of strange hadrons (K S , φ, Λ, Ξ and Ω) in √ sNN = 7.7−39 GeV Au+Au collisions in the RHIC beam energy scan program. We investigate the strangeness enhancement and strangeness equilibration as a function of beam energy and system size at RHIC. Nuclear modification factors and particle ratios will be highlighted. Implications on partonic vs. ...

The Vlasov equation can describe the evolution of a particle density under the effects of electromagnetic fields and thus it is possible to describe the evolution of a charged particle beam within an accelerator beam line. The Vlasov equation forms a partial differential equation in a 6D phase space witch renders it very expensive if it is solved via classical methods. A more efficient approach...

A review of the three main observables for particle beam dynamics, namely tune, chromaticity and coupling is presented. Their relevance for the analysis of singleparticle motion will be discussed together with computational and measurement issues.