Correction magnet power supplies for APS machine

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Description

A number of correction magnets are required for the advanced photon source (APS) machine to correct the beam. There are five kinds of correction magnets for the storage ring, two for the injector synchrotron, and two for the positron accumulator ring (PAR). Table I shoes a summary of the correction magnet power supplies for the APS machine. For the storage ring, the displacement of the quadrupole magnets due to the low frequency vibration below 25 Hz has the most significant effect on the stability of the positron closed orbit. The primary external source of the low frequency vibration is the ... continued below

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14 p.

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Kang, Y.G. April 1, 1991.

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Description

A number of correction magnets are required for the advanced photon source (APS) machine to correct the beam. There are five kinds of correction magnets for the storage ring, two for the injector synchrotron, and two for the positron accumulator ring (PAR). Table I shoes a summary of the correction magnet power supplies for the APS machine. For the storage ring, the displacement of the quadrupole magnets due to the low frequency vibration below 25 Hz has the most significant effect on the stability of the positron closed orbit. The primary external source of the low frequency vibration is the ground motion of approximately 20 {mu}m amplitude, with frequency components concentrated below 10 Hz. These low frequency vibrations can be corrected by using the correction magnets, whose field strengths are controlled individually through the feedback loop comprising the beam position monitoring system. The correction field require could be either positive or negative. Thus for all the correction magnets, bipolar power supplies (BPSs) are required to produce both polarities of correction fields. Three different types of BPS are used for all the correction magnets. Type I BPSs cover all the correction magnets for the storage ring, except for the trim dipoles. The maximum output current of the Type I BPS is 140 Adc. A Type II BPS powers a trim dipole, and its maximum output current is 60 Adc. The injector synchrotron and PAR correction magnets are powered form Type III BPSs, whose maximum output current is 25 Adc.

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14 p.

Notes

INIS; OSTI as DE95015229

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  • Other Information: PBD: Apr 1991

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  • Other: DE95015229
  • Report No.: LS--169
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/97089 | External Link
  • Office of Scientific & Technical Information Report Number: 97089
  • Archival Resource Key: ark:/67531/metadc793471

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  • April 1, 1991

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 6, 2016, 2:59 p.m.

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Kang, Y.G. Correction magnet power supplies for APS machine, report, April 1, 1991; Illinois. (digital.library.unt.edu/ark:/67531/metadc793471/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.