Simulation of HOM Leakage in the PEP-II Bellows

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An important factor that limits the PEP-II from operating at high currents is higher-order-mode (HOM) heating of the bellows. One source of HOM heating is the formation of trapped modes at the bellows as a result of geometry variation in the vacuum chamber, for example, the masking near the central vertex chamber. Another source comes from HOMs generated upstream that leak through the gaps between the bellows fingers. Modeling the fine details of the bellows and the surrounding geometry requires the resolution and accuracy only possible with a large number of mesh points on an unstructured grid. We use the ... continued below

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3 pages

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Ng, C.-K.; Folwell, N.; Ge, L.; Langton, J.; Lee, L.-Q.; Novokhatski, A. et al. June 7, 2005.

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An important factor that limits the PEP-II from operating at high currents is higher-order-mode (HOM) heating of the bellows. One source of HOM heating is the formation of trapped modes at the bellows as a result of geometry variation in the vacuum chamber, for example, the masking near the central vertex chamber. Another source comes from HOMs generated upstream that leak through the gaps between the bellows fingers. Modeling the fine details of the bellows and the surrounding geometry requires the resolution and accuracy only possible with a large number of mesh points on an unstructured grid. We use the parallel finite element eigensolver Omega3P for trapped mode calculations and the S-matrix solver S3P for transmission analysis. The damping of the HOMs by the use of absorbers inside the bellows will be investigated.

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3 pages

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  • Presented at Particle Accelerator Conference 2005, Knoxville, Tenn., 15-20 May 2005

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  • Report No.: SLAC-PUB-11259
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 890452
  • Archival Resource Key: ark:/67531/metadc883462

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  • June 7, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 9:17 p.m.

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Ng, C.-K.; Folwell, N.; Ge, L.; Langton, J.; Lee, L.-Q.; Novokhatski, A. et al. Simulation of HOM Leakage in the PEP-II Bellows, article, June 7, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc883462/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.