We present an update on the development of the new code for long-term simulation of beam-beam effects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order particle tracking (including a symplectic option) for beam transport and the generalized Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel im...

A useful diagram is presented and used to study rf cavity voltage regulation in a damping ring or other circular accelerator where large beam currents are injected and extracted rapidly. With conventional feedback systems and high particle beam currents, the maximum beam current can be limited by the ability of the klystron to maintain constant gap voltage at high currents, low currents, or in ...

A short, intense particle beam can drive a very large amplitude plasma wave or wakefield. The longitudinal component of the wakefield results in energy loss of the bulk of the beam and gain of the particles in the beam tail. First, a systematic investigation of the longitudinal fields excited in a plasma by a short, dense beam of electrons or positrons is carried out using two-dimensional, cyli...

BACKGROUND Intrafractional motion results in local over- and under-dosage in particle therapy with a scanned beam. Scanned beam delivery offers the possibility to compensate target motion by tracking with the treatment beam. METHODS Lateral motion components were compensated directly with the beam scanning system by adapting nominal beam positions according to the target motion. Longitudinal ...

Nonlinear field is of importance for the design and operation of circular machines and nonlinear beam dynamics has been intensively investigated both theoretically and experimentally [1]. Theoretically, nonlinear elements are designed on purpose to assist the operation of the machines e.g., the correction of the chromatic aberration and/or slow extraction with the help of sextupole magnets, the...

the need for simulation of human foot mechanism has made researchers and engineers move towards different patterns to describe this movement. in this regard, optimal solutions such as energy consumption, accuracy, etc. are of utmost importance. in this paper, efforts have been made to present a new solution by designing a fully two-dimensional six-bar mechanism with one degree of freedom so tha...

The oscillating relativistic electrons in the accelerating/focusing wakefields of plasma accelerators emit electromagnetic radiation known as betatron (BR). proton-driven wakefield acceleration has been demonstrated Advanced Wakefield Experiment (AWAKE) at CERN; however, its accompanying emission is less explored compared with those laser- and electron beam-driven accelerators. In this paper, a...

A generation of halo particles and an emittance growth are investigated numerically for a highcurrent beam transport during a longitudinal bunch compression. The halo particles are generated during the drift compression with an alternating gradient confinement lattice in the transverse direction. The emittance growth is caused by the halo particle generation, and depends on the drift length for...

In this paper airflow, nano-and micro-particle motions in an aerodynamic particle beam focusing system consisting of several lenses, a nozzle and the downstream chamber, was studied. A three-dimensional numerical simulation for the system was presented and the compressible airflow and thermal conditions in the aerodynamic lens system were evaluated. Dilute particle concentration was assumed so ...