Abstract Polyethylene‐clay hybrids have been prepared successfully by melt compounding with maleic anhydride grafted polyethylene (MA‐g‐PE), organophilic clay and polyethylene. In these polyethylene‐clay hybrids, the silicate layers of were exfoliated dispersed to monolayers. The exhibit higher tensile yield strengths moduli than those matrices polyethylene‐inorganic composites. When 5‐wt% clays loaded, strength modulus hybrid were, respectively, 1.4 1.8 times polyethylene/MA‐g‐PE mixture....

Abstract Ultraprecise single-ion irradiation is practically of interest for the application research and development quantum materials devices. To achieve this, a system, consisting linear Paul trap (LPT) electrostatic bipotential lenses, being developed at Takasaki Institute Advanced Quantum Science, National Institutes Science Technology. In this paper, we conduct detailed multiparticle simulations on controlled ejection single ions from two-component Coulomb crystal generated in LPT,...

Abstract A basic mechanism of halo formation in high-intensity hadron accelerators is explored theoretically. As a possible origin halos, we focus on deviation an initial bunch size from its ideal dimensions, other words, spatial mismatch the shape to accelerator lattice. Such error unavoidable any machines and thus needs be considered carefully. Assuming axisymmetric uniform beam-focusing potential, calculate transverse longitudinal wavenumbers linear collective modes three-dimensional...

Molecular dynamics is employed to study the nature and magnitude of beam cooling that required in order achieve a crystalline beam. Analysis presented number systems now use, or whose use contemplated, none which has been shown be able state. However, for an adequately strong system produces on average constant angular velocity among particles, state can achieved. In this paper, we present numerical values particular example under typical experimental conditions; these appear achievable practice.

It is shown theoretically that a coupling cavity (namely, an rf operating in the ${\mathrm{TM}}_{210}$ mode) inserted into storage ring will enhance between longitudinal and transverse degrees of freedom. As result, demonstrated very effective laser cooling motion can now be extended to motion; i.e., employed cool beam all three directions.

More than 107 electrons and 105 positrons with energy less a few eV were confined simultaneously for the first time in compact magnetic mirror trap plugging potentials. The exponential decay constant of exceeded 70 ms at beginning simultaneous confinement. Particle simulations early stages mixing process also conducted. results obtained experiments suggested that an improved setup would make it possible to investigate unexplored field low-energy electron–positron plasmas experimentally.

We study halo formation from cylindrical beams propagating in a uniform focusing channel. Of particular interest here are the breathing-mode oscillations excited by an initial beam-size mismatch. develop one-dimensional space-charge code which is simple but powerful exploring properties of breathing beams. After giving brief description two particle-core models, we apply developed to three different types nonlinear phase-space distributions. Based on number multiparticle simulation runs,...

An extensive experimental study is performed to confirm fundamental resonance bands of an intense hadron beam propagating through alternating gradient linear transport channel. The present work focuses on the most common lattice geometry called ``FODO'' or ``doublet'' that consists two quadrupoles opposite polarities. tabletop ion-trap system ``S-POD'' (Simulator Particle Orbit Dynamics) developed at Hiroshima University employed clarify parameter-dependence coherent instability. S-POD can...

A tabletop experimental system has been developed for the study of various collective effects in space-charge-dominated beams. It is based on recently proposed idea that dynamic motion a one-component plasma trap can be made physically equivalent to charged-particle beam propagating through linear transport channel. In this paper, we report details and results test experiments with compact Paul divided into several independent sections. The design carried out consideration practical...

We propose a possible scheme to realize three-dimensional laser cooling of stored and circulating ion beams in storage ring. The idea is based on creating linear synchrobetatron coupling such that the longitudinal effect can be extended transverse degrees freedom through coupling. indirect was recently studied, employing so-called cavity as source forced In present paper, we theoretically explore possibility using natural dispersion ring an alternative source, setting ordinary rf at position...

Linear and nonlinear resonant instabilities of charged-particle beams traveling in periodic quadrupole focusing channels are studied experimentally with a compact non-neutral plasma trap. The present experiments based on the idea that collective motion beam an accelerator is physically similar to one-component A linear Paul trap system named ``S-POD'' (simulator for particle orbit dynamics) was developed explore variety space-charge-induced phenomena. To emulate lattice-dependent effects,...

This paper addresses a detailed experimental study of collective instability bands generated near every half-integer tune per lattice period by coherent dipole and quadrupole resonances. Both instabilities appear side or overlap each other but are mostly separable because the resonance often creates narrower stop band accompanied more severe particle losses. The separation these low-order becomes greater as beam intensity increases. In principle, double stop-band structure can be formed even...

With the aid of Mori's projection operator method, it is shown that mechanical equations motion for flux variables can be transformed rigorously into reduced form da, (t) / dt=iliJr a1 (t)- J: ds [,P1 (t-s) + ¢1 (t-s)] · (s) g1 jj(t), where a, a column matrix generalized fluxes standing j·th order time derivative state (t), <Po =0, g0 =0 and liJ1 frequency matrix. jj(t) random force corresponding memory A new fluctuating cf;1 represent effects lower· fluxes. The temporal behaviour g 1 quite...

The effect of resonance crossing on beam stability is studied systematically by employing a novel tabletop experimental tool and multiparticle simulation code. A large number ions are confined in compact linear Paul trap to reproduce the collective behavior. We can prove that ion plasma physically equivalent charged-particle propagating through strong focusing channel. confinement force quickly ramped such operating point traverses nonlinear stop bands. Assuming nonscaling fixed field...

We present an experimental study aimed at exploring integer resonance crossing with a focus on nonscaling fixed field alternating gradient accelerators. The method uses the Simulator of Particle Orbit Dynamics system Hiroshima University based compact ion trap known as Paul trap. In setup that mimics Electron Model for Many Applications accelerator, we have verified theoretical prediction coherent excitation dipole motion over wide range errors and speeds. addition, cancellation amplitude...

This paper addresses the generalization of single-particle betatron resonance condition derived by Courant and Snyder more than a half century ago. A two-dimensional including effect space-charge interaction was recently conjectured from one-dimensional Vlasov predictions made Sacherer, Okamoto, Yokoya [K. Ito et al., Phys. Rev. Accel. Beams 20, 064201 (2017)]. The is remarkably simple which only contains few measurable quantities indicates possibility that twice as many stop bands expected...