摘要:

The results of simulation of the closed orbit distortion (COD) and correction for 600 MeV Proton Storage Ring (PSR) are presented. Monte‐Carlo method for number of realization up to 105have been used to obtain expected values of COD before and after correction. Both harmonic correction and a method of ‘‘least square’’ with best correctors have been used. All results are presented for both main operation modes of the PSR.

ISSN:0094-243X    

DOI:10.1063/1.42302

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

This paper describes the architecture of CEBAF’s control system, TACL, and the integration of modeling procedures into the system. It shows how the TACL system can be used as a test stand for the development of procedures and how the operation can be supported by modeling tools. The implementation and results are presented.

ISSN:0094-243X    

DOI:10.1063/1.42303

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Accurately modelling the behavior of particles circulating in accelerators is a computationally demanding task. The particle tracking code currently in use at the SSC is based upon a ‘‘thin element’’ analysis (TEAPOT). In this model each magnet in the lattice is described by a thin element at which the particle experiences an impulsive kick. Each kick requires approximately 200 floating point operations (‘‘FLOP’’). For the SSC collider lattice consisting of 104elements, performing a tracking of study for a set of 100 particles for 107turns would require 2×1015FLOPS. Even on a machine capable of 100 MFLOP/sec (MFLOPS), this would require 2×107seconds, and many such runs are necessary. It should be noted that the accuracy with which the kicks are to be calculated is important: the large number of iterations involved will magnify the effects of small errors.

ISSN:0094-243X    

DOI:10.1063/1.42304

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

We very briefly describe two C++ classes: the first models beamlines; the second implements differential algebra. Used together they provide the beginnings of a toolkit for accelerator design and analysis that is imbedded in a fully functional and supported extensible language.

ISSN:0094-243X    

DOI:10.1063/1.42305

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

We present the absolute minimum knowledge required to design a symplectic integrator for small rings. We do not cover the topic of radiation. It is imperative that a modern code for small electron machine be also capable of treating a classically radiating electron. We reserve this for another article.

ISSN:0094-243X    

DOI:10.1063/1.42306

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The concept of phase space density provides a properly macroscopic description of a beam bunch of mutually non‐interacting particles. Ideally, simulations of particle beam behavior ought to concentrate directly on the dynamics of the beam phase space density rather than on that of individual particles—an immediate benefit being the elimination of the statistical uncertainty inevitably arising from the sampling of such particles. Here a preliminary step is taken in the direction of this desirable goal—a ‘‘toy’’ one‐degree‐of‐freedom (the transverse horizontal) beam phase space density is simulated for a highly simplified lattice consisting of a purely linear FODO ring which contains a single thin‐element nonlinear kick. These meager ingredients produce a fascinating collection of beam density snapshots in the phase space—including such phenomena as the filamentation and ‘‘fragmentation’’ of a kicked beam, the process of formation of phase space islands under a variety of circumstances, and spiral twisting of the beam density within the dynamic aperture.

ISSN:0094-243X    

DOI:10.1063/1.42307

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

This paper will describe a study of the coupling effects and their compensation by means of local decoupling techniques for some of the accelerators in the SSC Complex. Results concerning corrections and decoupling for the Low Energy and Medium Energy Boosters will be compared to results obtained for the Collider Ring. Some preliminary experimental data about measurement of coupling quantities will also be presented.

ISSN:0094-243X    

DOI:10.1063/1.42308

出版商:AIP    

年代:1992

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.42309

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

For the Superconducting Super Collider (SSC) dynamic aperture study, one‐turn‐map tracking can be made nearly as reliable as element‐by‐element trackings. If a‐one‐turn map is sympletic and accurate to five or more digits in one‐turn tracking for the phase‐space coordinates of particles within the interest region (inside or around the dynamic aperature), then the one‐turn map is nearly as reliable as its associated element‐by‐element tracking for predicting the ‘‘global’’ long‐term stability of the storage ring.

ISSN:0094-243X    

DOI:10.1063/1.42321

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Employing Lie algebraic objects in perturbation theory is not just a computational device. They appear in a natural manner from the very structure of the perturbation procedure itself. This is seen most clearly if the Poisson bracket Lie algebra of Hamiltonian dynamics is understood to be the last in a chain of three homomorphic Lie algebras, beginning from commutators of vector fields.

ISSN:0094-243X    

DOI:10.1063/1.42322

出版商:AIP    

年代:1992

数据来源: AIP