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Title: High beam current shut-off systems in the APS linac and low energy transfer line

Abstract

Two independent high beam current shut-off current monitoring systems (BESOCM) have been installed in the APS linac and the low energy transport line to provide personnel safety protection in the event of acceleration of excessive beam currents. Beam current is monitored by a fast current transformer (FCT) and fully redundant supervisory circuits connected to the Access Control Interlock System (ACIS) for beam intensity related shutdowns of the linac. One FCT is located at the end of the positron linac and the other in the low energy transport line, which directs beam to the positron accumulator ring (PAR). To ensure a high degree of reliability, both systems employ a continuous self-checking function, which injects a test pulse to a single-turn test winding after each ``real`` beam pulse to verify that the system is fully functional. The system is designed to be fail-safe for all possible system faults, such as loss of power, open or shorted signal or test cables, loss of external trigger, malfunction of gated integrator, etc. The system has been successfully commissioned and is now a reliable part of the total ACIS. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

Authors:
; ;  [1]
  1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
249316
Report Number(s):
CONF-9410219-
Journal ID: APCPCS; ISSN 0094-243X; TRN: 96:014283
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 333; Journal Issue: 1; Conference: Beam instrumentation workshop, Vancouver (Canada), 2-6 Oct 1994; Other Information: PBD: 5 May 1995
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; BEAM MONITORING; BEAM CURRENTS; ENGINEERED SAFETY SYSTEMS

Citation Formats

Wang, X., Knott, M., and Lumpkin, A.. High beam current shut-off systems in the APS linac and low energy transfer line. United States: N. p., 1995. Web. doi:10.1063/1.48051.
Wang, X., Knott, M., & Lumpkin, A.. High beam current shut-off systems in the APS linac and low energy transfer line. United States. doi:10.1063/1.48051.
Wang, X., Knott, M., and Lumpkin, A.. 1995. "High beam current shut-off systems in the APS linac and low energy transfer line". United States. doi:10.1063/1.48051.
@article{osti_249316,
title = {High beam current shut-off systems in the APS linac and low energy transfer line},
author = {Wang, X. and Knott, M. and Lumpkin, A.},
abstractNote = {Two independent high beam current shut-off current monitoring systems (BESOCM) have been installed in the APS linac and the low energy transport line to provide personnel safety protection in the event of acceleration of excessive beam currents. Beam current is monitored by a fast current transformer (FCT) and fully redundant supervisory circuits connected to the Access Control Interlock System (ACIS) for beam intensity related shutdowns of the linac. One FCT is located at the end of the positron linac and the other in the low energy transport line, which directs beam to the positron accumulator ring (PAR). To ensure a high degree of reliability, both systems employ a continuous self-checking function, which injects a test pulse to a single-turn test winding after each ``real`` beam pulse to verify that the system is fully functional. The system is designed to be fail-safe for all possible system faults, such as loss of power, open or shorted signal or test cables, loss of external trigger, malfunction of gated integrator, etc. The system has been successfully commissioned and is now a reliable part of the total ACIS. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.},
doi = {10.1063/1.48051},
journal = {AIP Conference Proceedings},
number = 1,
volume = 333,
place = {United States},
year = 1995,
month = 5
}
  • Two independent high beam current shut-off current monitoring systems (BESOCM) have been installed in the APS linac and the low energy transport line to provide personnel safety protection in the event of acceleration of excessive beam currents. Beam current is monitored by a fast current transformer (FCT) and fully redundant supervisory circuits connected to the Access Control Interlock System (ACIS) for beam intensity related shutdowns of the linac. One FCT is located at the end of the positron linac and the other in the low energy transport line, which directs beam to the positron accumulator ring (PAR). To ensure amore » high degree of reliability, both systems employ a continuous self-checking function, which injects a test pulse to a single-turn test winding after each ``real`` beam pulse to verify that the system is fully functional. The system is designed to be fail-safe for all possible system faults, such as loss of power, open or shorted signal or test cables, loss of external trigger, malfunction of gated integrator, etc. The system has been successfully commissioned and is now a reliable part of the total ACIS.« less
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  • The high average beam power of an rf linac system for transmutation of nuclear waste puts very stringent requirements on beam quality and beam control. Fractional beam losses along the accelerator must be kept at extremely low levels to assure ''hands-on'' maintenance. Hence, halo formation and large-amplitude tails in the particle distribution due to beam mismatch and equipartitioning effects must be avoided. This implies that the beam should ideally be in near-perfect thermal equilibrium from injection to full energy-in contrast to existing rf linacs in which the transverse temperature, T perpendicular, is higher than the longitudinal temperature, T parallel. Themore » physics and parameter scaling for such a system will be reviewed using the results of recent work on high-intensity bunched beams. A design strategy for a high-current rf linac with equilibrated beam will be proposed.« less
  • Space charge-dominated (SCD) beam main regularities in the beginning part of high-current proton linac are presented. Charge redistribution during beam transport and bunching are considered. Code tools ZHALO and KERN+HALO are used for physical process better understanding and scientific visualization of different factor influence on SCD-beam transport and bunching.