A 20 ampere shunt regulator for controlling individual magnets in a seriesed string

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Description

At the CEBAF accelerator, groups of dipole magnets are often connected together in series and powered from a single large constant-current regulated D-C supply, referred to locally as a {open_quotes}box{close_quotes} supply. Besides the economy realized, this configuration promotes correct field tracking of all elements of a beam transport channel. However, it is often desirable to vary the current in one element of a string independently of the others, particularly at the entrance and exits of transport channels. A 20 ampere programmable current shunt is described. Installed in parallel with the desired magnet, it permits shunting (bypassing) up to 5% of ... continued below

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5 p.

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Martin, E.J.; Dobeck, N.; Jones, G.S. & O`Sullivan, M.K. August 1, 1996.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 11 times . More information about this article can be viewed below.

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Description

At the CEBAF accelerator, groups of dipole magnets are often connected together in series and powered from a single large constant-current regulated D-C supply, referred to locally as a {open_quotes}box{close_quotes} supply. Besides the economy realized, this configuration promotes correct field tracking of all elements of a beam transport channel. However, it is often desirable to vary the current in one element of a string independently of the others, particularly at the entrance and exits of transport channels. A 20 ampere programmable current shunt is described. Installed in parallel with the desired magnet, it permits shunting (bypassing) up to 5% of the string current around that magnet. The shunt regulator consists of a bank of MOSFET power transistors operated in linear mode. Regulation of current through the passbank is obtained by feedback from a manganin shunt maintained at a constant temperature for stability. The module is designed for remote operation and provides readbacks of various parameters useful for maintenance. To achieve complete electrical isolation, an onboard microprocessor provides remote communications via an opto-isolated serial data link. Constructional details and initial operating experience with the plug-in shunt are described.

Physical Description

5 p.

Notes

INIS; OSTI as DE96013327

Source

  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE96013327
  • Report No.: DOE/ER/40150--340
  • Report No.: CEBAF-PR--95-029;CONF-950512--400
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 379059
  • Archival Resource Key: ark:/67531/metadc686377

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 17, 2015, 7:42 p.m.

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Martin, E.J.; Dobeck, N.; Jones, G.S. & O`Sullivan, M.K. A 20 ampere shunt regulator for controlling individual magnets in a seriesed string, article, August 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc686377/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.