摘要:

The non‐intercepting beam current monitoring systems suitable for a wide range of beam parameters have been developed for the Advanced Photon Source (APS) low energy transport lines and high energy transport line. The positron or electron beam pulse in the transport lines will have peak beam currents ranging from 8 mA to 29 A with pulse widths varying from 120 ps to 30 ns and pulse repetition rates from 2 Hz to 60 Hz. The peak beam current or total beam charge is measured with the fast or integrating current transformer, respectively, manufactured by Bergoz. In‐house high speed beam signal processing electronics provide a DC level output proportional to the peak current or total charge for the digitizer input. The prototype systems were tested on the linacs which have beam pulse structures similar to that of the APS transport lines. This paper describes the design of beam signal processing electronics and grounding and shielding methods for current transformers. The results of the initial operations are presented. A short introduction on the preliminary design of current monitoring systems for the APS rings is also included.

ISSN:0094-243X    

DOI:10.1063/1.44342

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The memory scanner is a VXI module that is part of the Advanced Photon Source (APS) beam position monitor (BPM) data acquisition system. Each module is designed to gather and process digital data from up to nine digital channels transmitting the BPM data from the storage ring (360 locations) and the synchrotron (80 locations). It stores beam history in a buffer, performs a running average of the X and Y position data, stores the latest scan of all channels, and provides high speed digital output of the beam position data for the global orbit feedback system. The system’s capability to support single pass, closed orbit, and tune measurement functions will also be briefly described.

ISSN:0094-243X    

DOI:10.1063/1.44343

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Beam position monitors using stripline pickups for 30 ns long electron and positron beam bunches have been built and responses were measured in the vertical and horizontal directions. Log amplifiers used for signal processing have a dynamic range of 40 dB and are scaled for 50 mV/dB sensitivity. In this paper we describe the design of the detectors, the signal processing electronics, and the results of the position‐to‐signal mapping using a wire. Beam position measurements using a prototype detector and electronics on the APS linac test stand are discussed.

ISSN:0094-243X    

DOI:10.1063/1.44344

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The average position of the beam near the crest of the accelerating voltage in the Stanford Linear Collider linac must be kept stable to a fraction of an S‐band wavelength or about 0.5 ps. Temperature stabilized S‐band RF distribution cables and phase monitors have been installed along the 3 km linac to minimize the effects of the up to 40 degree F daily temperature excursions in the support building environment. In this paper, we present test results of the equipment designed to determine the stability of the RF distribution system by comparing it directly to the beam. In particular, efforts to stabilize the propagation delay of the system’s coaxial cables will be described.

ISSN:0094-243X    

DOI:10.1063/1.44345

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Fifty wire scanners are in use at SLC for phase space and beam optics monitoring. A large number of failures of the 50 &mgr;m wire used in the scanners have occurred. Studies of these show strong electro‐magnetic fields produced by the beam to be the probable cause. The problem has been cured with the adoption of a ceramic mounting scheme. Other improvements including very high dynamic range scans and scans of non‐gaussian beams are described.

ISSN:0094-243X    

DOI:10.1063/1.44346

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

A prototype of the Monopulse Beam Position Monitor (BPM) was tested to determine the resolution capability for various signal levels and beam configurations. The BPM was tested in two environments: using a wire simulation of the beam in the laboratory and using real beam at various positions and levels at Stanford Synchrotron Radiation Laboratory. Both tests showed a resolution capability of better than 25 microns. This paper presents the procedures and measurements’ results.

ISSN:0094-243X    

DOI:10.1063/1.44347

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

A fluorescent screen was used to monitor relative beam position and spot size of a 56‐MeV electron beam in the linac test stand. A chromium doped alumina ceramic screen inserted into the beam was monitored by a video camera. The resulting image was captured using a frame grabber and stored into memory. Reconstruction and analysis of the stored image was performed using PV‐WAVE. This paper will discuss the hardware and software implementation of the fluorescent screen and imaging system. Proposed improvements for the APS linac fluorescent screens and image processing will also be discussed.

ISSN:0094-243X    

DOI:10.1063/1.44348

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

This is a description of a VXIbus Register Based Beam Position Monitor module. This module consists of a sealed analog module that outputs the sum and difference of the log signals for both the X and Y axis of the Beam Position Monitor (BPM). These signals are then digitized by 12‐bit analog‐to‐digital converters. These digitized values are then stored in memory. A selectable number of these digitized values can also be averaged and stored. This will be particularly useful when close orbit information is required.

ISSN:0094-243X    

DOI:10.1063/1.44349

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The Fermilab Main Injector will be used as an injector of 150 GeV/c protons and antiprotons for the existing Tevatron. Additionally, it will provide 120 GeV/c protons for antiproton production, year around 120 GeV/c low intensity slow resonant proton extraction (slow spill) for test beams to all experimental areas, 120 GeV/c high intensity slow spill for dedicated kaon experiments, and 120 GeV/c high intensity fast resonant proton extraction for dedicated neutrino experiments. Much of the instrumentation is scheduled to be recycled from the existing Main Ring while some is to be newly built. A brief description of the Main Injector parameters will be presented along with instrumentation requirements for the accelerator and its associated beamlines.

ISSN:0094-243X    

DOI:10.1063/1.44359

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Recent progress in the development of a beam position monitor system (BPM), based on the log‐ratio technique, is described in this paper. A complete electronic analysis is presented, showing linearity, dynamic range, noise, RF burst response, and temperature dependence. A calibration technique has been developed, which corrects the errors due to mismatched channels and electronics drift. This technique is particularly effective because of the log‐ratio property for beam position monitoring. This circuit is the most likely candidate for beam position monitor electronics at the SSC.

ISSN:0094-243X    

DOI:10.1063/1.44350

出版商:AIP    

年代:1992

数据来源: AIP