The successful commissioning and operation of the PEP-II asymmetric ee collider motivated further studies to increase luminosity. In this paper, we discuss a modification of the PEP-II lattice to reduce the vertical beta function at the Interaction Point (IP) from the design value of β∗ y = 1.5cm to 1.0cm. This could potentially reduce the colliding beam size, increase the particle density at I...

An approach to unequivocally determine the three-dimensional orientation of optically manipulated NaYF4:Er(3+),Yb(3+) upconverting nanorods (UCNRs) is demonstrated. Long-term immobilization of individual UCNRs inside single and multiple resonant optical traps allow for stable single UCNR spectroscopy studies. Based on the strong polarization dependent upconverted luminescence of UCNRs it is pos...

Scanned particle beams are used since 1997 for treatment of stationary tumors [1]. One current field of research aims at transferring this highly tumor conformal treatment technique to moving tumors. Therefore, techniques to mitigate dose deteriorations caused by interference between beam scanning and tumor motion are needed [2]. Technical feasibility of different motion mitigation techniques h...

The G4beamline program [1] is a useful and steadily improving tool to quickly and easily model beamlines and experimental equipment without user programming. Unlike most accelerator physics codes, it easily handles a wide range of materials and fields, being particularly well suited for the study of muon and neutrino facilities. As it is based on the Geant4 toolkit [2], G4beamline includes most...

We present a method for the generation of high kinetic energy attosecond electron packets via magnetostatic and aperture filtering of conical surface plasmon (SP) accelerated electrons. The conical SP waves are excited by coupling an ultrafast radially polarized laser beam to a conical silica lens coated with an Ag film. Electromagnetic and particle tracking models are employed to characterize ...

The fourth-integral betatron resonance driven by sextupoles was studied on the electron storage ring Aladdin at SRe. The resonance feature of capturing the phase space particles in the resonance islands was clearly demonstrated. In a computer simulation, the finite beam size is simulated by multi-particle tracking and the decoherence of the betatron oscillation was shown to agree well with expe...

Self-interaction of electron bunch in circular motion is numerically studied. It has been shown that the selfinteraction is expressed in terms of Liénard-Wiechert potential formula and can be calculated with threedimensional particle tracking. The relation between shielded radiation force and complex impedance of beam pipe is also discussed.

Time Expansion Chamber (TEC) will perform both particle identi cation and tracking functions in the PHENIX experiment. For the evaluation of the TEC performance, optimization of tracking and particle identi cation algorithms, and early development of o -line analysis software, detailed simulations are necessary. A Slow Simulator for PHENIX TEC (TECSS) was created for this purpose. The Simulator...

effect of temperature on hydrodynamics of bubbling gas-solid fluidized beds was investigated.  experiments were carried out in the range of 25-600 ºc and different superficial gas velocities in the range of 0.17-0.78 m/s with sand particles. time-position trajectory of particles was obtained by radioactive particle tracking technique. these data were used for determination of mean velocities of...

We describe a novel method to track fluorescent particles in three dimensions with nanometre precision and millisecond time resolution. In this method, we use our two-photon excitation microscope. The galvomotor-driven x-y scanning mirrors allow the laser beam to move repetitively in a circular path with a radius of half the width of the point spread function of the laser. When the fluorescent ...