Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)最新文献_第10页

Tune control in the Fermilab Main Injector 费米实验室主喷射器的调谐控制

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/PAC.1999.795331

G. Wu, B. Brown, D. Capista, R. Flora, D.E. Johnson, K. Martin

引用次数: 3

Chromaticity control in the Fermilab Main Injector 费米实验室主进样器色度控制

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/PAC.1999.795332

G. Wu, C. Bhat, B. Brown, D.E. Johnson

引用次数: 2

A free interactive matching program 一个免费的互动配对程序

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/PAC.1999.792912

J. Ostiguy

{"title":"A free interactive matching program","authors":"J. Ostiguy","doi":"10.1109/PAC.1999.792912","DOIUrl":"https://doi.org/10.1109/PAC.1999.792912","url":null,"abstract":"For physicists and engineers involved in the design and analysis of beamlines (transfer lines or insertions) the lattice function matching problem is central and can be time-consuming because it involves constrained nonlinear optimization. For such problems convergence can be difficult to obtain in general without expert human intervention. Over the years, powerful codes have been developed to assist beamline designers. The canonical example is MAD (Methodical Accelerator Design) developed at CERN by Christophe Iselin. MAD, through a specialized command language, allows one to solve a wide variety of problems, including matching problems. Although in principle, the MAD command interpreter can be run interactively, in practice the solution of a matching problem involves a sequence of independent trial runs. Unfortunately, but perhaps not surprisingly, there still exists relatively few tools exploiting the resources offered by modern environments to assist lattice designer with this routine and repetitive task. In this paper, we describe a fully interactive lattice matching program, written in C++ and assembled using freely available software components. An important feature of the code is that the evolution of the lattice functions during the nonlinear iterative process can be graphically monitored in real time; the user can dynamically interrupt the iterations at will to introduce new variables, freeze existing ones into their current state and/or modify constraints. The program runs under both UNIX and Windows NT.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73588549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of sextupole orbit offsets in the APS storage ring APS存储环中六极轨道偏移量的测量

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/pac.1999.794189

M. Borland, E. Crosbie, N. Sereno

引用次数: 1

Measurements of the electron cloud in the APS storage ring APS存储环中电子云的测量

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/PAC.1999.794207

K. Harkay, R.A. Rosenburg

{"title":"Measurements of the electron cloud in the APS storage ring","authors":"K. Harkay, R.A. Rosenburg","doi":"10.1109/PAC.1999.794207","DOIUrl":"https://doi.org/10.1109/PAC.1999.794207","url":null,"abstract":"Synchrotron radiation interacting with the vacuum chamber walls in a storage ring produce photoelectrons that can be accelerated by the beam, acquiring sufficient energy to produce secondary electrons in collisions with the walls. If the secondary-electron yield (SEY) coefficient of the wall material is greater than one, as is the case with the aluminum chambers in the 7-GeV Advanced Photon Source (APS) storage ring, a runaway condition can develop. As the electron cloud builds up along a train of stored positron or electron bunches, the possibility exists that a transverse perturbation of the head bunch will be communicated to trailing bunches due to interaction with the cloud. In order to characterize the electron cloud, a special vacuum chamber was built and inserted into the ring. The chamber contains 10 rudimentary electron-energy analyzers, as well as three targets coated with different materials. Measurements show that the intensity and electron energy distribution are highly dependent on the temporal spacing between adjacent bunches and the amount of current contained in each bunch. Furthermore, measurements using the different targets are consistent with what would be expected based on the SEY of the coatings. Data for both positron and electron beams are presented.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81157046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

An ionization cooling channel for muon beams based on alternating solenoids 一种基于交变螺线管的介子光束的电离冷却通道

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/PAC.1999.792136

J. Gallardo, R. Fernow, H. Kirk, R. Palmer, P. Lebrun, A. Moretti, A. Tollestrup, D. Kaplan, Y. Fukui

引用次数: 7

High current, long beam pulse with SLED 大电流，长光束脉冲与SLED

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI: 10.1109/PAC.1999.795351

F. Decker, Z. Farkas, J. Turner

引用次数: 9

Alignment of the VISA undulator VISA波动器的对准

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-15 DOI: 10.1109/PAC.1999.795558

R. Ruland, D. Arnett, G. Bowden, R. Carr, B. Dix, B. Fuss, C. Le Cocq, Z. Wolf, J. Aspenleiter, G. Rakowsky, J. Skaritka, P. Duffy, M. Libkind

引用次数: 5

Multi-step lining-up correction of the CLIC trajectory 多步直线校正CLIC轨迹

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-15 DOI: 10.1109/PAC.1999.792316

E. D'amico, G. Guignard

{"title":"Multi-step lining-up correction of the CLIC trajectory","authors":"E. D'amico, G. Guignard","doi":"10.1109/PAC.1999.792316","DOIUrl":"https://doi.org/10.1109/PAC.1999.792316","url":null,"abstract":"In the CLIC main linac it is very important to minimise the trajectory excursion and consequently the emittance dilution in order to obtain the required luminosity. Several algorithms have been proposed and lately the ballistic method has proved to be very effective. The trajectory correction method described hereafter retains the main advantages of the latter while adding some interesting features. It is based on the separation of the unknown variables like the quadrupole misalignments, the offset and slope of the injection straight line and the misalignments of the beam position monitors (BPM). This is achieved by referring the trajectory relatively to the injection line and not to the average pre-alignment line and by using two trajectories each corresponding to slightly different quadrupole strengths. A reference straight line is then derived onto which the beam is bent by a kick obtained by moving the first quadrupole. The other quadrupoles are then aligned on that line. The quality of the correction depends mainly on the BPM's and micro-movers' resolution and on the stability of the quadrupole strengths. Simulation statistics show that the beam offset from the center-of the quadrupoles is typically 1.5 /spl mu/m r.m.s.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88202691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Bunch cleaning strategies and experiments at the Advanced Photon Source 先进光子源束清洁策略与实验

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-15 DOI: 10.1109/PAC.1999.792678

N. Sereno

引用次数: 2