Estimate of the contributions of bellows to the impedances and beam instabilities of the SSC

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Between sections of the vacuum chamber, bellows are needed to compensate for thermal expansion and transverse offsets. For beampipe made of stainless steel with a coefficient of linear expansion 19 x 10/sup -6///sup 0/C and a temperature variation of approx.316/sup 0/C, the allowance for bellows is approx.1.2% of the total length of the beampipe, if we assume that the bellows are 50% compressible. This implies 1.08 km of bellows for Design A of the SSC which has a circumference of 90 km. Such a length of bellows will certainly contribute to the longitudinal and transverse impedances of the accelerator and ... continued below

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Pages: 17

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Bisognano, J. & Ng, K.Y. July 1, 1985.

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Between sections of the vacuum chamber, bellows are needed to compensate for thermal expansion and transverse offsets. For beampipe made of stainless steel with a coefficient of linear expansion 19 x 10/sup -6///sup 0/C and a temperature variation of approx.316/sup 0/C, the allowance for bellows is approx.1.2% of the total length of the beampipe, if we assume that the bellows are 50% compressible. This implies 1.08 km of bellows for Design A of the SSC which has a circumference of 90 km. Such a length of bellows will certainly contribute to the longitudinal and transverse impedances of the accelerator and will therefore affect the stability of the beam. In the Reference Designs, the actual impedances of the bellows have not been calculated; only an allowance of Z/sub parallel//n = 0.05 ..cap omega.. and Z/sub perpendicular/ = 7 M..cap omega../m is made for miscellaneous discontinuities because all the bellows and pumping ports are assumed totally shielded. It is the purpose of this article to examine the actual contributions by the bellows to the longitudinal and transverse impedances assuming that they are not shielded.

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Pages: 17

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NTIS, PC A02; 3.

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  • Other Information: Paper copy only, copy does not permit microfiche production

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  • Other: DE85017363
  • Report No.: FNAL-TM-1340
  • Grant Number: AC03-76SF00098
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/5442404 | External Link
  • Office of Scientific & Technical Information Report Number: 5442404
  • Archival Resource Key: ark:/67531/metadc1070605

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  • July 1, 1985

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 28, 2018, 1:16 p.m.

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Bisognano, J. & Ng, K.Y. Estimate of the contributions of bellows to the impedances and beam instabilities of the SSC, report, July 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc1070605/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.