Impedances and beam stability issues of the Fermilab recycler ring

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The Fermilab Recycler Ring (permanent magnets) will be built on top of the Fermilab Main Injector sharing the same tunnel; its main function is to recycle the anti-protons after a store in the Tevatron and to provide storage for them after after accumulation and cooling in the Accumulator. Estimates of coupling impedances show domination by space charge. Examination of longitudinal instabilities shows that microwave instability will not occur if there are only N = 2.53 x 10{sup 12} anti-protons in the beam. Longitudinal coupling-bunch instability during injection stacking does not appear possible because of long bunch lengths/short bunch gaps and ... continued below

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15 p.

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Ng, King-Yuen April 1, 1996.

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Description

The Fermilab Recycler Ring (permanent magnets) will be built on top of the Fermilab Main Injector sharing the same tunnel; its main function is to recycle the anti-protons after a store in the Tevatron and to provide storage for them after after accumulation and cooling in the Accumulator. Estimates of coupling impedances show domination by space charge. Examination of longitudinal instabilities shows that microwave instability will not occur if there are only N = 2.53 x 10{sup 12} anti-protons in the beam. Longitudinal coupling-bunch instability during injection stacking does not appear possible because of long bunch lengths/short bunch gaps and lack of sharp resonances. Transverse instability, on the other hand, cannot be Landau damped by the momentum spread in the beam, but it can be cured by a small spread in the betatron tunes (either from space charge or an octupole).

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15 p.

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INIS; OSTI as DE96010602

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  • Other Information: PBD: Apr 1996

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  • Other: DE96010602
  • Report No.: FNAL-TM--1971
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/237426 | External Link
  • Office of Scientific & Technical Information Report Number: 237426
  • Archival Resource Key: ark:/67531/metadc672652

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 1, 2016, 5:29 p.m.

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Ng, King-Yuen. Impedances and beam stability issues of the Fermilab recycler ring, report, April 1, 1996; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc672652/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.