ICALEPCS1991 - Classification: Modelling and Simulation

Paper	Title	Page
S16MS01	SSC Lattice Database and Graphical Interface	538
	C.G. Trahern, J. Zhou SSCL, Dallas, TX, USA
	Funding: Operated by the Universities Research Association, Inc., for the U.S. Department of Energy under Contract No. DE-AC35-89ER40486. The SSC lattice database and the graphical tools used to access it are discussed. When completed the Superconducting Super Collider will be the world’s largest accelerator complex. In order to build this system on schedule, the use of database technologies will be essential. In this paper we discuss one of the database efforts underway at the SSC, the lattice database. The original work on this database system began at the SSC Central Design Group and is described in a report by E. Barr, S. Peggs, and C. Saltmarsh in March 1989. Operated by the Universities Research Association, Inc., for the U.S. Department of Energy under Contract No. DE-AC35-89ER40486.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS01
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS02	Framework for Control System Development	542
	C.W. Cork, H. Nishimura LBNL, Berkeley, California, USA
	Funding: This work was supported by the US DOE under Contract No. DE-AC03-76SF00098 Control systems being developed for the present generation of accelerators will need to adapt to changing machine and operating state conditions. Such systems must also be capable of evolving over the life of the accelerator operation. Several of the new generation of control systems hardware being developed today have the capability of fast, sophisticated control at all levels in the control hierarchy. These systems are typically hierarchical and highly distributed with extremely high I/O throughput. We have initiated the design of a framework for control system development which can accommodate the new architectures. This paper will present requirements, design decisions, and specifications that we have devised for this framework.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS02
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS03	The LEP Model Interface for MAD	546
	F.C. Iselin CERN, Geneva, Switzerland
	During machine studies and trouble-shooting in the LEP machine various optical parameters must be computed, which can be found quickly using the MAD program. However, the LEP operators are not all well acquainted with MAD. In order to ease their task, a simple interface called the LEP model has been written to run on the Apollo workstations of the LEP control system. It prepares jobs for MAD, sends them to a DN 10000 node for execution, and optionally plots the results. The desired machine positions and optical parameters vary between LEP runs. The LEP model contains a powerful selection algorithm which permits easy reference to any combination of positions and optical parameters in the machine. Elements can be chosen by name, by sequence number, or by element class. The choice of optical functions includes closed orbit, Twiss parameters, betatron phases, chromatic functions, element excitations, and many more. Recently matching features have been added. Communication with the control system and with MAD uses self-describing tables, i.e. tables whose columns are labelled with their name and a format code. Experience with this LEP model interface is reported.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS03
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS04	Optimization of Accelerator Control	550
	N.D. Vasiljev, L.V. Mozin, V.A. Shelekhov NIIEFA, St. Petersburg, Russia
	Expensive exploitation of charged particle accelerators is inevitably concerned with requirements of effectively obtaining of the best characteristics of accelerated beams for physical experiments. One of these characteristics is intensity. Increase of intensity is hindered by a number of effects, concerned with the influence of the volume charge field on a particle motion dynamics in accelerator’s chamber. However, ultimate intensity, determined by a volume charge, is almost not achieved for the most of the operating accelerators. This fact is caused by losses of particles during injection, at the initial stage of acceleration and during extraction. These losses are caused by deviations the optimal from real characteristics of the accelerating and magnetic system. This is due to a number of circumstances, including technological tolerances on structural elements of systems, influence of measuring and auxiliary equipment and beam consumers’ installations, placed in the closed proximity to magnets, and instability in operation of technological systems of accelerator. Control task consists in compensation of deviations of characteristics of magnetic and electric fields by optimal selection of control actions. As for technical means, automation of modem accelerators allows to solve optimal control problems in real time. Therefore, the report is devoted to optimal control methods and experimental results.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS04
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS05	Modelling and Optimization of Beams Dynamics in Linac	555
	N.S. Edamenko, D.A. Ovsyannikov, A.P. Zhabko Saint Petersburg State University, Saint Petersburg, Russia V.S. Kabanov MRTI RAS, Moscow, Russia
	Problems of acceleration and focusing in linear accelerators are considered. A general mathematical problem of charged particle beam control is formulated. Methods and algorithms of solving these problems are developed. Problems of mathematical simulation of beam dynamics are discussed in detail. Some beam quality functions depending on all particle tracks are proposed. Mathematical methods are used for choosing parameters of forming systems. Designed codes allow to simulate and optimize beam dynamics. This report is devoted to the realization of general approach to problem of dynamical system trajectories control in accelerating and focusing structures.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS05
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

SSC Lattice Database and Graphical Interface

538

C.G. Trahern, J. Zhou
SSCL, Dallas, TX, USA

Funding: Operated by the Universities Research Association, Inc., for the U.S. Department of Energy under Contract No. DE-AC35-89ER40486.
The SSC lattice database and the graphical tools used to access it are discussed. When completed the Superconducting Super Collider will be the world’s largest accelerator complex. In order to build this system on schedule, the use of database technologies will be essential. In this paper we discuss one of the database efforts underway at the SSC, the lattice database. The original work on this database system began at the SSC Central Design Group and is described in a report by E. Barr, S. Peggs, and C. Saltmarsh in March 1989.
Operated by the Universities Research Association, Inc., for the U.S. Department of Energy under Contract No. DE-AC35-89ER40486.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS01

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS02

Framework for Control System Development

542

C.W. Cork, H. Nishimura
LBNL, Berkeley, California, USA

Funding: This work was supported by the US DOE under Contract No. DE-AC03-76SF00098
Control systems being developed for the present generation of accelerators will need to adapt to changing machine and operating state conditions. Such systems must also be capable of evolving over the life of the accelerator operation. Several of the new generation of control systems hardware being developed today have the capability of fast, sophisticated control at all levels in the control hierarchy. These systems are typically hierarchical and highly distributed with extremely high I/O throughput. We have initiated the design of a framework for control system development which can accommodate the new architectures. This paper will present requirements, design decisions, and specifications that we have devised for this framework.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS02

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS03

The LEP Model Interface for MAD

546

F.C. Iselin
CERN, Geneva, Switzerland

During machine studies and trouble-shooting in the LEP machine various optical parameters must be computed, which can be found quickly using the MAD program. However, the LEP operators are not all well acquainted with MAD. In order to ease their task, a simple interface called the LEP model has been written to run on the Apollo workstations of the LEP control system. It prepares jobs for MAD, sends them to a DN 10000 node for execution, and optionally plots the results. The desired machine positions and optical parameters vary between LEP runs. The LEP model contains a powerful selection algorithm which permits easy reference to any combination of positions and optical parameters in the machine. Elements can be chosen by name, by sequence number, or by element class. The choice of optical functions includes closed orbit, Twiss parameters, betatron phases, chromatic functions, element excitations, and many more. Recently matching features have been added. Communication with the control system and with MAD uses self-describing tables, i.e. tables whose columns are labelled with their name and a format code. Experience with this LEP model interface is reported.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS03

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS04

Optimization of Accelerator Control

550

N.D. Vasiljev, L.V. Mozin, V.A. Shelekhov
NIIEFA, St. Petersburg, Russia

Expensive exploitation of charged particle accelerators is inevitably concerned with requirements of effectively obtaining of the best characteristics of accelerated beams for physical experiments. One of these characteristics is intensity. Increase of intensity is hindered by a number of effects, concerned with the influence of the volume charge field on a particle motion dynamics in accelerator’s chamber. However, ultimate intensity, determined by a volume charge, is almost not achieved for the most of the operating accelerators. This fact is caused by losses of particles during injection, at the initial stage of acceleration and during extraction. These losses are caused by deviations the optimal from real characteristics of the accelerating and magnetic system. This is due to a number of circumstances, including technological tolerances on structural elements of systems, influence of measuring and auxiliary equipment and beam consumers’ installations, placed in the closed proximity to magnets, and instability in operation of technological systems of accelerator. Control task consists in compensation of deviations of characteristics of magnetic and electric fields by optimal selection of control actions. As for technical means, automation of modem accelerators allows to solve optimal control problems in real time. Therefore, the report is devoted to optimal control methods and experimental results.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS04

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S16MS05

Modelling and Optimization of Beams Dynamics in Linac

555

N.S. Edamenko, D.A. Ovsyannikov, A.P. Zhabko
Saint Petersburg State University, Saint Petersburg, Russia
V.S. Kabanov
MRTI RAS, Moscow, Russia

Problems of acceleration and focusing in linear accelerators are considered. A general mathematical problem of charged particle beam control is formulated. Methods and algorithms of solving these problems are developed. Problems of mathematical simulation of beam dynamics are discussed in detail. Some beam quality functions depending on all particle tracks are proposed. Mathematical methods are used for choosing parameters of forming systems. Designed codes allow to simulate and optimize beam dynamics. This report is devoted to the realization of general approach to problem of dynamical system trajectories control in accelerating and focusing structures.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S16MS05

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)