نتایج جستجو برای: particle beam tracking

تعداد نتایج: 388417  

2016
Feifei YAN Wenge CHANG Xiangyang LI Qilei ZHANG

In non-cooperative bistatic synthetic aperture radar (SAR), the position of transmitter’s beam footprint should be detected and tracked in real-time to perform beam synchronization. Theoretical analysis shows that signal-tonoise ratio (SNR) of the reflected echoes from the observational scene is too low to apply the conventional detection and tracking method. According to the cross-correlation ...

2010
N. Saito C. Bert N. Chaudhri M. Durante A. Gemmel R. Lüchtenborg E. Rietzel

For radiotherapy with external beams, quality assurance (QA) of beam delivery is mandatory. Dynamical irradiation which changes parameters of beam delivery devices during the irradiation has to be assessed with a great caution. At GSI a dynamic beam delivery system, so called beam tracking system [1] was developed and integrated into the GSI therapy system [2] to irradiate moving tumours with i...

2000
G. Pöplau U. van Rienen

The simulation of the motion of a particle beam in linear colliders requires fast and robust numerical algorithms. The following approach to simulate the effect of nonlinear space charge forces on the dynamics of space charge dominated electron beams has been realized in the tracking code Q [9]. The related tracking algorithm has to solve the relativistic equations of motion for a large number ...

Journal: :Pattern Recognition Letters 2009
Hong Liu Ze Yu Hongbin Zha Yuexian Zou Lin Zhang

Multi-cue integration has been researched extensively for robust visual tracking. Researchers aim to use multiple cues under the probabilistic methods, such as Particle Filtering and Condensation. On the other hand, Color-based Mean-Shift has been addressed as an effective and fast algorithm for tracking color blobs. However, this deterministic searching method suffers from objects with low sat...

2011
Wenjie Yan Cornelius Weber Stefan Wermter

This article presents a novel approach for a real-time person tracking system based on particle filters that use different visual streams. Due to the difficulty of detecting a person from a top view, a new architecture is presented that integrates different vision streams by means of a Sigma-Pi network. A short-term memory mechanism enhances the tracking robustness. Experimental results show th...

Journal: :Signal Processing 2015
Xionghu Zhong Arash Mohammadi A. Benjamin Premkumar Amir Asif

Journal: :Nuclear Instruments and Methods in Physics Research 2021

The international PEN collaboration aims to obtain the branching ratio for pion electronic decay $\pi^+ \to e^+\nu_e(\gamma)$, aka $\pi_{e2}$, a relative precision of $5\times 10^{-4}$ or better. apparatus comprises number detection systems, all contributing vital information event reconstruction. This paper discusses design, performance, and Monte Carlo simulation mini time projection chamber ...

2000
T. Katsouleas W. B. Mori E. Dodd S. Lee R. Hemker C. Clayton C. Joshi E. Esarey

The co-propagation of an intense particle beam with an ionizing laser beam in a working gas/plasma is considered. When the axes of the laser and particle beam are not aligned, then asymmetric plasma lensing results in a net dipole "eld acting on the particle beam. The particle beam can be steered or bent (as well as focused) by steering the laser. An analogy is made between the bending of the p...

2010
R. Lüchtenborg N. Saito N. Chaudhri M. Durante N. Kurz E. Rietzel

Beam tracking is the potentially most conformal motion mitigation technique in scanned ion beam therapy. For translational motion, beam tracking has been shown to be feasible precisely [1]. If rotational or even deformable motion is present, dose deposition changes even if beam tracking is applied because beam tracking adapts the Bragg peak position only. Dose deposition to other regions, mainl...

1998
S. Heifets Y. T. Yan

Quantum corrections to beam dynamics are considered. It is shown t&at quantum corrections included in tracking can substantially affect beam trajectory in the vicinity of the separatrix. Abstract Quantum corrections to beam dynamics are considered. It is shown that quantum corrections included in tracking can substantially affect beam trajectory in the vicinity of the separatrix.

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