High-efficiency deflection of high-energy negative particles through axial channeling in a bent crystal

Deflection due to axial channeling in a silicon crystal bent along the [111] axis was observed for 150 GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side with the efficiency of about 90% and with the peak position at the bend crystal angle α=43 μrad. The deflection occurs mainly due to doughnut scattering of above-barrier particles by the atomic strings of the crystal. However, due to a high probability of particle recapture into bound states with the atomic strings their contribution to the deflection should be about 15% for our case according to simulation results

High-Efficiency Deflection of High-Energy Protons through Axial Channeling in a Bent Crystal

Beam deflection due to axial channeling in a silicon crystal bent along the [111] axis was observed with 400  GeV/c protons at the CERN Super Proton Synchrotron. The condition for doughnut scattering of protons by the atomic strings of the crystal was attained. Such a condition allowed one to observe a beam deflection of 50  μrad with about 30% efficiency. The contribution of hyperchanneled states of protons to the observed beam deflection was less than 2% according to simulation results

A Survey on Executive Compensation , A Study on Influencing Factors of Executive Compensation in Listed Companies

企业要想保持稳定持续的发展，就离不开一个公平合理的薪酬激励制度，同时这也是全体员工都非常关心的一个问题。全球经济一体化趋势愈演愈烈，在经受了2008年席卷全球的金融危机之后，上市公司高管薪酬以及他们过高的薪酬又一次成为众多媒体的焦点。尽管对于高管薪酬激励的研究由来己久，并且已经形成了相当多的研究成果，但是无论在理论界还是实践中，对于高管薪酬的关注却是从未减少过。一方面是高管薪酬问题会一直伴随着企业发展，是老生常谈且十分重要的企业机制，另一方面也说明了现有的研究还不能满足实践中的需求，还存在着种种不足和局限。 本文以我国2005-2010年A股上市公司的高管薪酬为对象，多角度、多层次地调查我国...Only a few other issues in the history of the modern corporation have generated the amount of fury as the executive compensation. While workers real income stagnated or even dropped over this period, there has been unprecedented growth in total pay for top executives. This decoupling of pay and performance at the very top caused considerable concern and public outcry, renewing the calls for compen...学位：管理学硕士院系专业：管理学院财务学系_财务学学号：3212009115059

High-EfficiencyVolume Reflection of an Ultrarelativistic Proton Beam with a Bent Silicon Crystal

The volume reflection phenomenon was detected while investigating 400 GeV proton interactions with bent silicon crystals in the external beam H8 of the CERN Super Proton Synchrotron. Such a process was observed for a wide interval of crystal orientations relative to the beam axis, and its efficiency exceeds 95%, thereby surpassing any previously observed value. These observations suggest new perspectives for the manipulation of high-energy beams, e.g., for collimation and extraction in new-generation hadron colliders, such as the CERN Large Hadron Collider

Double volume reflection of a proton beam by a sequence of two bent crystals

The doubling of the angle of beam deflection due to volume reflection of protons by a sequence of two bent silicon crystals was experimentally observed at the 400 GeV proton beam of the CERN SPS. A similar sequence of short bent crystals can be used as an efficient primary collimator for the Large Hadron Collider

Experimental apparatus to study crystal channeling in an external SPS beamline

For the new generation of high intensity hadronic machines as, for instance, LHC, halo collimation is a necessary issue for the accelerator to operate at the highest possible luminosity and to prevent the damage of superconductor magnets. We propose an experiment aimed to systematic study of the channeling phenomenology and of the newly observed "volume reflection" effect. This experiment will be performed for an external SPS beamline and will make use of a primary proton beam with 400 GeV/c momentum and very small ( 3c 3 \u3bc rad) divergence. The advantage of a proposed experiment is precise tracking of particles that interacted with a crystal, so that to determine the single-pass effciency for all the processes involved. For this purpose, a telescope equipped with high-resolution silicon microstrip detectors will be used. New generation silicon crystals and an extra-precise goniometer are mandatory issues. Main goal of the experiment is to get the precise information on channeling of relativistic particles and, ultimately, on the feasibility of such technique for halo collimation at LHC. In this contribution we review the status of the setting-up of experimental apparatus and its future development in sight of the planned run in September 2006

Double volume reflection of a proton beam by a sequence of two bent crystals (vol 658 pg 109 2008)

Errata corrige a Double volume reflection of a proton beam by a sequence of two bent crystals (vol 658, pg 109, 2008