PEP-II magnet power conversion systems

Jackson, L. T.; Saab, A.; Shimer, D.W.

doi:10.1109/pac.1995.505421

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…Because PCD did not receive technically responsive proposals, PCD designed and assembled it [12] based on existing PS that power the large PEP string magnets. In this way, SPEAR 3 benefited from an existing design [8].…”

Section: Large Power Suppliesmentioning

confidence: 99%

Spear3 Dc Magnet Power Supplies - An Overview

Lira

2004

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The Stanford Synchrotron Radiation Laboratory (SSRL) has successfully commissioned SPEAR 3, its newly upgraded 3-GeV synchrotron light source. First stored beam occurred December 15, 2003. This paper presents an overview and descriptions of the DC magnet power supplies. These consist of tightly-regulated (≤ 10 ppm) current sources ranging in output from 30 A to 800 A and output power ranging from a few watts to almost 1.0 MW. A total of 226 magnet power supplies are in successful operation. The SPEAR 3 upgrade performance and reliability requirements mandated new power supplies for both the SPEAR 3 storage ring, and for the booster-to-SPEAR 3 (BTS) transport line. A large variety of precise, highly stable current power supplies were needed to fill the diverse magnet needs. Also described are outside procurement aspects, in-house construction, installation, testing, performance and operation of the power supplies. During field testing, special emphasis was made to ensure a critically damped reponse on the current loop. Frequency spectra measurements were made for reference and future diagnostics.

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Section: Large Power Suppliesmentioning

confidence: 99%

Spear3 Dc Magnet Power Supplies - An Overview

Lira

2004

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“…Reference [2] describes the typical current control system employed in the LGPS. Figure 4 shows a load current stability measurement over a period of 7+ hours in one of the LGPS, where the total room temperature deviation was 5º C. A large frequency bandwidth in the design of the LGPS output voltage control loop is a guarantee to the rejection of line disturbances.…”

Section: Resultsmentioning

confidence: 99%

“…The new board contains an output voltage feedback control loop, some of the PWM and over-current interlocks, and an interface with an external Bitbus controller [2]. The new control board also provides the PWM signals to the IGBT gate driver boards.…”

Section: The New Controlsmentioning

confidence: 99%

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PEP-II Large Power Supplies Rebuild Program at SLAC

Bellomo

Lipari²,

Lira³

et al.

Proceedings of the 2005 Particle Accelerator Conference

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Seven large power supplies (LGPS) with output ratings from 72kW to 270kW power PEP-II quad magnets in the electron-positron collider region. These supplies have posed serious maintenance and reliability problems since they were installed in 1997, resulting in loss of accelerator availability. A redesign/rebuild program was undertaken by the SLAC Power Conversion Department. During the 2004 summer shutdown all the control circuits in these supplies were redesigned and replaced. A new PWM control board, programmable logic controller, and touch panel have been installed to improve LGPS reliability, and to make troubleshooting easier. In this paper we present the details of this rebuilding program and results.

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PEP II status and plans

Seeman

Proceedings Particle Accelerator Conference

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The PEP I1 B-Factory project is an e+e-colliding beam storage ring complex to be built on the SLAC site. PEP I1 is designed to provide a luminosity of 3 x 1033 cm-%-l at a center of mass of 10.6 GeV with unequal energy beams of 3.1 and 9.0 GeV. The goal is to study CP violation in the B meson system. The project is being built by a collaboration of the Stanford Linear Accelerator Center, Lawrence Berkeley Laboratory, and Lawrence Livermore National Laboratory. DOE construction authorization was given in 1994. The asymmetric beam energies require two storage rings with the low energy ring (LER) supported above the high energy ring (HER). There will be one interaction point with head-on collisions, requiring magnetic separation of the beams, low values of the beta functions, and magnetic elements inside the solenoid of the BABAR2 physics detector. The high luminosity necessitates a large number of bunches requiring advances in the vacuum design, damped RF cavities, and bunch-by-bunch feedback systems. The injection scheme uses the high current, low emittance, on-energy beams available from the SLAC linac. At present, the old PEP tunnel has been cleared and installation of the high energy ring has started. Several of the many papers on PEP I1 at this conference are listed in References 3-23.

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PEP-II magnet power conversion systems

Cited by 3 publications

References 5 publications

Spear3 Dc Magnet Power Supplies - An Overview

Spear3 Dc Magnet Power Supplies - An Overview

PEP-II Large Power Supplies Rebuild Program at SLAC

PEP II status and plans

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