Results 1 - 10 of 9785
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[en] A Very Large Hadron Collider (VLHC) was proposed for the post-LHC future. This paper gives a quick survey of a number of accelerator physics issues based on the information obtained from a parameter spreadsheet SSP. The main technical challenges to build such a machine appear to be: the large number of events per crossing (in hundreds), enormous beam stored energy (equivalent to tens tons of TNT), ground motion (which is particularly harmful when the synchrotron frequency is in the sub-Hertz range), small dynamic aperture (due to long filling time), fast growth of the resistive wall instability (in a fraction of one turn), low threshold of the single bunch transverse instability (due to big machine size), strong synchrotron radiation (at a level close to the LEP) and short radiation damage lifetime, etc. Possible solutions to some of these problems will also be discussed
[en] The construction of a full scale prototype shower counter for the FNAL Collider Detector Facility central calorimetry is described in detail. Beam tests provide results on performance parameters. (orig.)
[en] This talk is intended to survey the main topics that will be covered at this workshop, emphasizing some of the issues and goals. The author tries to provide an overview of the physics opportunities once the top quark is detected. Most topics have already been studied to some extent in the literature and will be covered in detail in other talks; I also spend a few minutes on some very recent work about the possibility of detecting CP violation at colliders.
[en] A 'Future High Energy Colliders' Symposium was held October 21-25, 1996 at the Institute for Theoretical Physics (ITP) in Santa Barbara. This was one of the 3 symposia hosted by the ITP and supported by its sponsor, the National Science Foundation, as part of a 5 month program on 'New Ideas for Particle Accelerators'. The long term program and symposia were organized and coordinated by Dr. Zohreh Parsa of Brookhaven National Laboratory/ITP. The purpose of the symposium was to discuss the future direction of high energy physics by bringing together leaders from the theoretical, experimental and accelerator physics communities. Their talks provided personal perspectives on the physics objectives and the technology demands of future high energy colliders. Collectively, they formed a vision for where the field should be heading and how it might best reach its objectives
[en] There is revised the phenomena of radiation of the particles in the focusing tract of the Linear collider. Analysis of the polarization is the additional factor in this procedure. 16 refs
[en] In order to increase the range of particle detection in crossed beam experiments, a mechanical synchronous modulator is proposed has an interrupter fitted with a fixer made in the form of a hollow cone with a 180 deg - αdeg angle at the vertex, where αdeg - stands for the angle of an angle intersection. The surface of the cone at its base and one of the sections perpendicular to its axis have each a row of modulation grooves. Such an interrupter design results in the scattering zone remaining outside the interrupter. This eliminates the effect of the walls of the interrupter on the scattered particles and allows the scattered particle detection range to be increased
[en] The contribution of vector boson fusion processes to the production of a heavy charged lepton accompanied by its neutral partner at multi-TeV hadronic colliders is studied. It is shown that vector fusion dominates over the usual quark-antiquark fusion mechanism, for a very heavy lepton and high energies. (Author)
[pt]A contribuicao dos processos de fusao de boson vetorial a producao de leptons pesados carregados, acompanhados de um parceiro neutro, em aceleradores que efetuam colisoes de hadrons em energias de varios TeV, e estudada. Mostra-se que a fusao de boson vetorial predomina sobre o mecanismo usual de fusao quark-antiquark, para leptons muito pesados e altas energias. (S.D.)
[en] The collective beam-beam effect can potentially cause a rapid growth of beam sizes and reduce the luminosity of a collider to an unacceptably low level. The ELIC, a proposed ultra high luminosity electron-ion collider based on CEBAF, employs high repetition rate crab crossing colliding beams with very small bunch transverse sizes and very short bunch lengths, and collides them at up to 4 interaction points with strong final focusing. All of these features can make the beam-beam effect challenging. In this paper, we present simulation studies of the beam-beam effect in ELIC using a self-consistent strong-strong beam-beam simulation code developed at Lawrence Berkeley National Laboratory. This simulation study is used for validating the ELIC design and for searching for an optimal parameter set.