3-D computer simulations of EM fields in the APS vacuum chamber: Part 1, Frequency-domain analysis

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The vacuum chamber proposed for the storage ring of the 7-GeV Advanced Photon Source (APS) basically consists of two parts: the beam chamber and the antechamber, connected to each other by a narrow gap. A sector of 1-meter-long chamber with dosed end plates, to which are attached the 1-inch-diameter beampipes centered at the beam chamber, has been built for experimental purposes. The 3-D code MAFIA has been used to simulate the frequency-domain behaviors of EM fields in this setup. The results are summarized in this note and are compared with that previously obtained from 2-D simulations and that from network ... continued below

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13 p.

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Chou, W. & Bridges, J. September 4, 1990.

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Description

The vacuum chamber proposed for the storage ring of the 7-GeV Advanced Photon Source (APS) basically consists of two parts: the beam chamber and the antechamber, connected to each other by a narrow gap. A sector of 1-meter-long chamber with dosed end plates, to which are attached the 1-inch-diameter beampipes centered at the beam chamber, has been built for experimental purposes. The 3-D code MAFIA has been used to simulate the frequency-domain behaviors of EM fields in this setup. The results are summarized in this note and are compared with that previously obtained from 2-D simulations and that from network analyzer measurements. They are in general agreement. A parallel analysis in the time-domain is reported in a separate note. The method of our simulations can be briefly described as follows. The 1-inch diameter beampipes are terminated by conducting walls at a length of 2 cm. The whole geometry can thus be considered as a cavity. The lowest RF modes of this geometry are computed using MAFIA. The eigenfrequencies of these modes are a direct output of the eigenvalue solver E3, whereas the type of each mode is determined by employing the postprocessor P3. The mesh sizes are chosen such that they are small enough for computations in the frequency region in which we are interested (the sampling theorem), while the total number of mesh points is still well within the range that our computer system can cope with.

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13 p.

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OSTI as DE95015553

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  • Other Information: PBD: 4 Sep 1990

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  • Other: DE95015553
  • Report No.: LS--157
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/105655 | External Link
  • Office of Scientific & Technical Information Report Number: 105655
  • Archival Resource Key: ark:/67531/metadc625418

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 4, 1990

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  • June 16, 2015, 7:43 a.m.

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  • Dec. 14, 2015, 12:41 p.m.

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Chou, W. & Bridges, J. 3-D computer simulations of EM fields in the APS vacuum chamber: Part 1, Frequency-domain analysis, report, September 4, 1990; Illinois. (digital.library.unt.edu/ark:/67531/metadc625418/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.