摘要:

Future accelerators will have to provide a high degree of reliability. Quality must be designed in right from the beginning and must remain a central theme throughout the project. The problem is similar to the problems facing US industry today, and examples of the successful application of quality engineering will be given. Different aspects of an accelerator project will be addressed: Concept, Design, Motivation, Management Techniques, and Fault Diagnosis. The importance of creating and maintaining a coherent team will be stressed.

ISSN:0094-243X    

DOI:10.1063/1.44328

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

This paper discusses the coupled‐bunch instability and how it applies to the ALS accelerator. The longitudinal ALS kicker is part of the bunch‐to‐bunch feedback system planned to control coupled‐bunch instabilities in the ALS. The mechanical features of the kicker are described, and the analytic tools developed to aid in the design are discussed. A method to predict the performance of the kicker in the accelerator from measurements on a prototype are described.

ISSN:0094-243X    

DOI:10.1063/1.44337

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The proposed next generation accelerator and synchrotron light facilities will require active feedback systems to control multi‐bunch instabilities. These feedback systems must operate in machines with thousands of circulating bunches and with short (2–4 ns) interbunch intervals. The functional requirements for transferse (betatron) and longitudinal (synchrotron) feedback systems are presented. Several possible implementation options are discussed and system requirements developed. Results are presented from a digital signal processing based synchrotron oscillation damper operating at the SSRL/SLAC SPEAR storage ring.

ISSN:0094-243X    

DOI:10.1063/1.44327

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

In this paper new goals for particle beam diagnostics are discussed in contrast to traditional applications. New accelerator design ideas to produce particle beams of high performance characteristics require a redefinition of beam diagnostics toward more sophisticated beam control and more automation in beam measurements and analysis. New accelerator design concepts are more and more based on the ability to match the actual accelerator to the theoretical model in order to allow the adjustment of parameters which are not directly controllable. Scenarios of possible developments in beam diagnostics in support of future particle accelerators will be discussed with the goal to envision beam diagnostics and control systems which can greatly reduce the involvement of accelerator operators by performing and analyzing well known and repetitive beam measurements faster, more accurate, and consistent.

ISSN:0094-243X    

DOI:10.1063/1.44329

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

This paper provides a basic overview of beam diagnostics and instrumentation for circular accelerators and storage rings. It addresses the techniques for measuring important accelerator parameters, such as betatron tunes, betatron functions, dispersion functions, beam position, beam size, and damping times. The instrumentation section contains a general description of beam position monitors, beam kickers, and general signal processing techniques. Some examples of actual accelerator measurements are included.

ISSN:0094-243X    

DOI:10.1063/1.44330

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

This paper discusses several techniques for isolating analog signals in an accelerator environment. The techniques presented here encompass isolation amplifiers, voltage‐to‐frequency converters (VFCs), transformers, optocouplers, discrege fiber optics, and commerical fiber optic links. Included within the presentation of each method are the design issues that must be considered when selecting the isolation method for a specific application.

ISSN:0094-243X    

DOI:10.1063/1.44331

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Electrical noise around accelerators covers a wide range of frequency and amplitude, sometimes creating problems for sensitive instrumentation. This article mentions some sources, as well as describing cases where solutions were found.

ISSN:0094-243X    

DOI:10.1063/1.44332

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The accelerator instrumentation played a vital role in commissioning the ALS injector accelerator. It helped us to see whether electron dynamics agreed with our theoretical predictions and important beam parameters met the design specifications. It helped us to see where beam losses occurred and why. In this paper we will start with a brief description of the ALS accelerator complex and the expected performance of it. Then we will describe each diagnostics instrument by its construction, operational principle, requirements, and our experiences with it. We will descrive the wall current monitor, the scintillator, the Faraday cup, the beam collimator, the beam position monitor, the direct‐current current transformer (DCCT), the traveling wave electrodes (TWE), the Sabersky finger, and other special instruments. Finally, we will go into some detail on how we measured the beam emittances, the closed orbit, and the betatron tunes.

ISSN:0094-243X    

DOI:10.1063/1.44354

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Two basic signal‐processing techniques are presently in wide use for the processing of signals from beam position monitors (BPMs); difference‐over‐sum, and amplitude‐modulation‐to‐phase‐modulation (AM‐PM) conversion. Difference‐over‐sum offers simplicity and low cost, but poor real‐time normalized response and amplitude dynamic range. AM‐PM offers fast real‐time response and large dynamic range, but is costly and difficult to implement. Logarithmic‐ratio processing, a technique using newly available inexpensive hybrid circuits, appears to offer the advantages of both, and the disadvantages of neither. This paper reviews the features of all three processing techniques, and highlights the features of the log‐ratio technique. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.44355

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The Fermilab 200 MeV Linac is scheduled to be upgraded to a 400 MeV Linac beginning in the Spring of 1993 [1]. We have designed beam diagnostics for the accelerator to expedite the commissioning and to facilitate the long‐term reliability of the machine. These diagnostics include: stripline beam position monitors, resistive wall‐current monitors, X‐Y‐U wire scanners, and various velocity and/or phase measurement devices, including bucnh‐length detectors fashioned after the work at the INR in Moscow [2]. This paper will discuss these devices and our plans fot the commissioning of the new Linac using these diagnostics.

ISSN:0094-243X    

DOI:10.1063/1.44356

出版商:AIP    

年代:1992

数据来源: AIP