نتایج جستجو برای: beam collimation
تعداد نتایج: 114192 فیلتر نتایج به سال:
A simple collimation technique based on measuring the period of one self-image produced by a diffraction grating is proposed. Transversal displacement of the grating is not required, and then automatic single-frame processing can be performed. The self-image is acquired with a CMOS camera, and the period is computed using the variogram function. Analytical and experimental results are obtained,...
Experiments were performed to investigate the propagation of a high intensity (I approximately 10(21) W cm(-2)) laser in foam targets with densities ranging from 0.9n(c) to 30n(c). Proton acceleration was used to diagnose the interaction. An improvement in proton beam energy and efficiency is observed for the lowest density foam (n(e)=0.9n(c)), compared to higher density foams. Simulations show...
We demonstrate theoretically a new mechanism for the energy-selective manipulation of electron beam by nanostructured heterodimensional graphene junctions (HDGJs). Beam splitting, collimation, and beam-guide can all be realized by designing HDGJs of different dimensionality, size and orientation. Importantly, these different functions can be combined together by predesigned patterning of multip...
One of the mechanisms of halo generation occurs when particles are trapped by a nonlinear resonance ν ≈ m/p as the tune ν is being modulated. This note is intended to renew some attention to this mechanism, and hopefully to trigger new study to understand it more quantitatively. This same mechanism used in reverse could serve to clean beam halos and to relax requirements on the collimators. Pre...
A primary proton beam from the CERN Super Proton Synchrotron is driven to a beryllium target (KL target). After a sweeping magnet and some collimators, a neutral beam is formed. The last collimator exit is located 126 m downstream of the target (see Fig. 1). The primary protons not interacting in the KL target are deflected by a bent crystal, forming a secondary proton beam that is transported ...
The ILC positron beam generated from a thin Ti target has a wide energy spread and large transverse divergence. With the collection optics immediately downstream of the target and pre-acceleration to 125 MeV, the collected positron beam still has a long tail of positrons with low energies and large transverse divergence, which will be lost in the rest of the ILC positron source beamline. A coll...
We demonstrate a compact silicon photonic crystal Mach-Zehnder interferometer operating in the self-collimation regime. By tailoring the photonic band structure such as to produce self-collimated beams, it is possible to design beam splitters and mirrors and combine these to a 20 x 20 microm(2) format. With transmission spectroscopy we find a pronounced unidirectional optical output, the output...
We summarize the Session 2 of the HHH-2004 workshop, which was devoted to beam dynamics and intensity challenges. The topics discussed included the extrapolation of collimation system, machine protection, beam dump, and rf systems to various LHC upgrade scenarios, spacecharge studies for the GSI complex, electron-cloud effects at RHIC and SNS, and a review of vacuum physics, which addressed, in...
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