Collimator wake fields in the SLC final focus

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The SLC final focus system accommodates 29 fixed or adjustable collimators for machine protection and background reduction. By amplifying pulse to pulse orbit variations and by generating emittance growth, collimator wake fields may degrade the beam quality at the interaction point (IP). In the SLC final focus, collimator half apertures are larger than the bunch length, so that the standard collimator wake formula of Bane and Morton does not apply. Numerical wake field calculations for SLC parameters agree quite well with the high frequency impedance of a step out transition. Due to the nature of a final focus system, the ... continued below

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6 p.

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Zimmermann, F.; Bane, K.L.F. & Ng, C.K. June 1, 1996.

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Description

The SLC final focus system accommodates 29 fixed or adjustable collimators for machine protection and background reduction. By amplifying pulse to pulse orbit variations and by generating emittance growth, collimator wake fields may degrade the beam quality at the interaction point (IP). In the SLC final focus, collimator half apertures are larger than the bunch length, so that the standard collimator wake formula of Bane and Morton does not apply. Numerical wake field calculations for SLC parameters agree quite well with the high frequency impedance of a step out transition. Due to the nature of a final focus system, the wake field kicks from all collimators add coherently, and the overall impact on luminosity can be significant. This paper suggests that collimator wake fields in the final focus provide a possible explanation for the 30% discrepancy between expected and measured luminosity in the 1994/95 SLC run.

Physical Description

6 p.

Notes

OSTI as DE97009075

Source

  • EPAC `96: 5. European particle accelerator conference, Barcelona (Spain), 10-14 Jun 1996

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  • Other: DE97009075
  • Report No.: SLAC-PUB--7137
  • Report No.: CONF-960621--
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 626415
  • Archival Resource Key: ark:/67531/metadc694041

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  • June 1, 1996

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 9, 2016, 12:29 p.m.

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Zimmermann, F.; Bane, K.L.F. & Ng, C.K. Collimator wake fields in the SLC final focus, article, June 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc694041/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.