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Title: Early operating and reliability experience with the CEBAF DC magnet power supplies

Abstract

The CEBAF accelerator is a five pass, recirculating, CW electron linear accelerator. There are a total of nine recirculation arcs connecting the two linacs. Three experimental halls are serviced by the accelerator through separate transport channels. The magnet powering system for CEBAF consists of approximately 2000 independent control channels. About 1850 of these channels are low current, trim magnet power supplies. There are 28 higher power supplies used to energize the major bending elements. Over one hundred, 20 amp, active shunts are used to vary current in selected magnets in the major dipole strings. The majority of the magnetic elements are concentrated in the arcs and transport channels. The correction dipoles, quadrupoles and sextupoles are each powered individually be a dedicated trim power supply channel. The arc and extraction channel dipoles are powered in series strings by the high powered supplies, known locally at CEBAF as `box power supplies'. Arc loads consist of some 30--40 magnets in series. Transport channel, path length control doglegs and septa box power supplies have loads ranging from 1 to 10 magnets. Shunts are installed on virtually all loads where two or more magnets are in series. At this time, 95% of the power suppliesmore » are installed and commissioned. In the past twelve months, beginning in May 1994, approximately 1200 trim magnet power supplies have been checked out. During this same period approximately 22 box power supplies and 100 shunts have been made operational. Full operation of the equipment has only been under way since early 1995. While this operation is only just beginning, much has been learned based on the reliability performance seen so far. The remainder of this paper describes the systems mentioned, their reliability problems, the fixes implemented to date, and some plans for the future. 6 refs., 3 tabs.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Southeastern Universities Research Association, Inc., Newport News, VA (US). Continuous Electron Beam Accelerator Facility (US)
Sponsoring Org.:
USDOE, Washington, DC (US)
OSTI Identifier:
282088
Report Number(s):
DOE/ER/40150-344; CEBAF-PR-95-033; CONF-950512-381; ON:DE96013334
ON: DE96013334; TRN: US0003210
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Technical Report
Resource Relation:
Conference: 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995; Other Information: Supercedes report DE96013334; PBD: 1 Aug 1996
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CEBAF ACCELERATOR; ELECTROMAGNETS; POWER SUPPLIES; SHUNT REACTORS; OPERATION; RELIABILITY

Citation Formats

Merz, W., Flood, R., Martin, E.J., and O'Sullivan, M. Early operating and reliability experience with the CEBAF DC magnet power supplies. United States: N. p., 1996. Web. doi:10.2172/282088.
Merz, W., Flood, R., Martin, E.J., & O'Sullivan, M. Early operating and reliability experience with the CEBAF DC magnet power supplies. United States. doi:10.2172/282088.
Merz, W., Flood, R., Martin, E.J., and O'Sullivan, M. Thu . "Early operating and reliability experience with the CEBAF DC magnet power supplies". United States. doi:10.2172/282088. https://www.osti.gov/servlets/purl/282088.
@article{osti_282088,
title = {Early operating and reliability experience with the CEBAF DC magnet power supplies},
author = {Merz, W. and Flood, R. and Martin, E.J. and O'Sullivan, M.},
abstractNote = {The CEBAF accelerator is a five pass, recirculating, CW electron linear accelerator. There are a total of nine recirculation arcs connecting the two linacs. Three experimental halls are serviced by the accelerator through separate transport channels. The magnet powering system for CEBAF consists of approximately 2000 independent control channels. About 1850 of these channels are low current, trim magnet power supplies. There are 28 higher power supplies used to energize the major bending elements. Over one hundred, 20 amp, active shunts are used to vary current in selected magnets in the major dipole strings. The majority of the magnetic elements are concentrated in the arcs and transport channels. The correction dipoles, quadrupoles and sextupoles are each powered individually be a dedicated trim power supply channel. The arc and extraction channel dipoles are powered in series strings by the high powered supplies, known locally at CEBAF as `box power supplies'. Arc loads consist of some 30--40 magnets in series. Transport channel, path length control doglegs and septa box power supplies have loads ranging from 1 to 10 magnets. Shunts are installed on virtually all loads where two or more magnets are in series. At this time, 95% of the power supplies are installed and commissioned. In the past twelve months, beginning in May 1994, approximately 1200 trim magnet power supplies have been checked out. During this same period approximately 22 box power supplies and 100 shunts have been made operational. Full operation of the equipment has only been under way since early 1995. While this operation is only just beginning, much has been learned based on the reliability performance seen so far. The remainder of this paper describes the systems mentioned, their reliability problems, the fixes implemented to date, and some plans for the future. 6 refs., 3 tabs.},
doi = {10.2172/282088},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1996},
month = {Thu Aug 01 00:00:00 EDT 1996}
}

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