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

Technical Report · Thu Aug 01 04:00:00 EDT 1996

DOI:https://doi.org/10.2172/282088· OSTI ID:282088

Merz, W; Flood, R; Martin, E J; O'Sullivan, M

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.

• Research Organization: Southeastern Universities Research Association, Inc., Newport News, VA (US). Continuous Electron Beam Accelerator Facility (US)
• Sponsoring Organization: USDOE, Washington, DC (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 282088
• Report Number(s): DOE/ER/40150--344; CEBAF-PR--95-033; CONF-950512--381; ON:DE96013334; ON: DE96013334
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CEBAF ACCELERATOR
ELECTROMAGNETS
OPERATION
POWER SUPPLIES
RELIABILITY
SHUNT REACTORS