Computations predicting RF cavity characteristics

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Description

The APS storage ring cavity is a single cell semi-spherical structure patterned along the lines of the KEK Photon Factory and the Daresbury cavities. The cavity was initially scaled to the APS frequency of 352.9 MHz using the computer code URMEL. Before construction of the prototype, it was considered essential to simulate the cavity as it would be measured in the machine shop as it was being built. The cavity has four large ports on the equator which would lower the frequency, but by how much? The code URMEL is only able to represent structures with rotational symmetry; MAFIA is ... continued below

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13 p.

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Jin, Y. & Nicholls, G. September 1, 1988.

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Description

The APS storage ring cavity is a single cell semi-spherical structure patterned along the lines of the KEK Photon Factory and the Daresbury cavities. The cavity was initially scaled to the APS frequency of 352.9 MHz using the computer code URMEL. Before construction of the prototype, it was considered essential to simulate the cavity as it would be measured in the machine shop as it was being built. The cavity has four large ports on the equator which would lower the frequency, but by how much? The code URMEL is only able to represent structures with rotational symmetry; MAFIA is three dimensional, and thus is able to simulate the actual structure. The first task was to determine what mesh size would be required using MAFIA to represent the structure in detail equivalent to that using URMEL. The computations not only give the effects of the ports on the frequency, but also a simulated tuner has been inserted into a port at various depths; thus, they have a prediction of a tuning curve. For each of the conditions, the first ten modes have been calculated, so they can see the effect of the tuner on the fundamental mode and also on the Higher Order Modes (HOM).

Physical Description

13 p.

Notes

OSTI as DE96015142

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  • Other Information: PBD: Sep 1988

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  • Other: DE96015142
  • Report No.: LS--124(ANL)
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/378887 | External Link
  • Office of Scientific & Technical Information Report Number: 378887
  • Archival Resource Key: ark:/67531/metadc688761

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 1, 1988

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Dec. 16, 2015, 5:26 p.m.

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Jin, Y. & Nicholls, G. Computations predicting RF cavity characteristics, report, September 1, 1988; Illinois. (digital.library.unt.edu/ark:/67531/metadc688761/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.