摘要:

The LEP machine is equipped with a very complete instrumentation [1,2] for beam position intensity and profile, tune and optic parameters, interaction rate, from which a summary is first presented. Second, the largest instrument for beam orbit measurement is described in more depgh.The Beam Orbit Measurement (BOM) System with its 504 Beam Position Monitors and 40 Processing Electronics Racks distributed along the 27 km of the LEP tunnel and linked by the Control System’s Token Ring has been installed and pre‐tested with simulated beam signals. The signal processing equipment must guarantee high reliability and precision despite high &ggr;‐irradiation and long cable transmission. In addition most of the electronics will not be accessible during operation. The analog signal processing is based on normalizers using phase modulation and on Flash ADC’s. Local memories allow the recording of data at each bunch passage for more than 1000 revolutions. It is followed by digital signal processing in local VME crates equipped with MC68000 microprocessor. The BOM system will be able to acquire data of up to bunches from which injection trajectories, average orbits, integer and fractional part of Q, &bgr; function and post event analysis will be processed.A first test with beam was successfully performed on a single station equipped for 12 monitors during the injection test of July 1988. It did validate the hardware and processing design. But complete results could only be reached in July 1989 when the proper triggering of all electronic stations could be adjusted on the circulating beam, via the Beam Synchronous Timing System. Most of the data analysis is done simultaneously in 40 microprocessors which communicate with a data Collector. Operational results are presented. The BOM System has been a key instrument for the success of LEP performance.

ISSN:0094-243X    

DOI:10.1063/1.40732

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The Booster Radiation Loss Monitor System (BRLM) used at the Alternating Gradient Synchrotron (AGS) at the Brookhaven National Laboratory is introduced. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.40757

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The Continuous Electron Beam Accelerator Facility (CEBAF), presently under construction, consists of a pair of .4 GeV recirculating linacs and will produce a 4 GeV CW beam with average currents of up to 200 &mgr;A. Because the accelerator is recirculating, multiple beams of different energies are present simultaneously in the linac beamlines. In these sections, it is required that the position of each different energy beam be measured separately. To achieve this, the electron beam itself must be modulated in time in such a way that each different energy beam in the linacs induces signals on the beam position monitors (BPMs) that can be separated using correlation techniques.In this paper, two types of correlation receiving systems used at CEBAF for the linac BPMs are described in detail. These receivers are based on the pulsed and bi‐phase pseudorandom modulated carrier methods for modulating the electron beam. In addition, the BPM receivers for the CEBAF arc regions, where the different energy beams are physically separated, are also described.

ISSN:0094-243X    

DOI:10.1063/1.40758

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

A panel discussion was held about beam position monitors and there use at different laboratories which include the SSC, BML, LANL, CEBAF, and CERN. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.40730

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The SLC wire scanner beam profile monitors provide accurate measurements for use in beam feedback systems and automated beam optimization procedures. Beam profile measurements can be performed throughout much of the SLC with no interruption to normal machine operation and no adverse impact on interaction region detector backgrounds. In this paper we describe the design, construction, performance and uses of SLC wire scanners with particular emphasis on the integration of the scanner with the accelerator controls. In keeping with the workshop nature of this meeting the difficulties encountered in the design and commissioning process will also be described.

ISSN:0094-243X    

DOI:10.1063/1.40731

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The presentation on ion profile monitors using microchannel plates consists of two principal parts. The first part describes the design and performance of a profile monitor that was installed in the Debuncher Ring of the Antiproton Source at Fermilab. The information presented relies to a large extent on the contents of a previously published article describing that project [1]. The second part of the presentation describes work in progress on a turn‐by‐turn profile monitor for the Fermilab Booster. A written description of that work is included elsewhere in these proceedings [2].

ISSN:0094-243X    

DOI:10.1063/1.40743

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

Schottky signals arising from the independent motions of particles in an accelerator are extremely useful for observing properties of the beam. This paper will outline the use of Schottky signals at Fermilab. Specific examples of longitudinal and transverse detectors will be shown as well as methods of amplifying and distributing the signals. Various types of signal monitoring equipment will be discussed with some examples of custom built equipment. Measurements of emittance, tune and other beam parameters will be shown.

ISSN:0094-243X    

DOI:10.1063/1.40744

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

This is the transcript of the discussion session which took place at 3:30 p.m. Tuesday October 2, 1990 at Fermilab. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.40745

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

Several unique time‐resolved imaging techniques have been developed to address radio frequency (RF)‐linac generated electron beams and the free‐electron lasers (FEL) driven by such systems. The time structure of these beams involve a series of micropulses with 10 to 15‐ps duration, separated by tens of nanoseconds. Mechanisms to convert the e‐beam information to optical radiation include optical transition radiation (OTR), Cherenkov radiation, spontaneous emission radiation (SER), and the FEL mechanism itself. The use of gated, intensified television cameras and synchroscan and dual‐sweep streak cameras to time‐resolve these signals has greatly enhanced the power of these techniques. A brief review of the less familiar conversion mechanisms and electro‐optical techniques is followed by a series of specific experimental examples from the RF linac FEL facilities at Los Alamos and Boeing (Seattle, WA).

ISSN:0094-243X    

DOI:10.1063/1.40746

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The author will cover the questions one might ask in selecting a transmission system in complex systems followed by the available hardware on the market. A short discussion of optical techniques and actual hardware sytems will be given. Special attention is paid to fiber optic systems. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.40747

出版商:AIP    

年代:1991

数据来源: AIP