Estimate of the impedance due to wall surface roughness

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In the Next Linear Collider (NLC) after being accelerated the beam is collimated to remove tail particles. Wakefields generated in the collimator section, however, can significantly degrade the beam emittance. The collimators are, therefore, carefully designed to balance and minimize the effects of the geometric and the resistive wall wakefields. Recent measurements of collimator wakefields in the Stanford Linear Collider (SLC) linac seem to confirm the geometric wakefield calculations but yield results for the resistive wall wakefield that are 3-4 times as large as expected. One possibility is that this discrepancy is due to the roughness of the collimator surface. ... continued below

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4 p.

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Bane, K.L.F.; Ng, C.K. & Chao, A.W. May 1, 1997.

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In the Next Linear Collider (NLC) after being accelerated the beam is collimated to remove tail particles. Wakefields generated in the collimator section, however, can significantly degrade the beam emittance. The collimators are, therefore, carefully designed to balance and minimize the effects of the geometric and the resistive wall wakefields. Recent measurements of collimator wakefields in the Stanford Linear Collider (SLC) linac seem to confirm the geometric wakefield calculations but yield results for the resistive wall wakefield that are 3-4 times as large as expected. One possibility is that this discrepancy is due to the roughness of the collimator surface. In this report we estimate this effect.

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4 p.

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INIS; OSTI as DE97006970

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97006970
  • Report No.: SLAC-PUB--7514
  • Report No.: CONF-970503--166
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 527897
  • Archival Resource Key: ark:/67531/metadc699055

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Office of Scientific & Technical Information Technical Reports

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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 2, 2016, 5:29 p.m.

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Bane, K.L.F.; Ng, C.K. & Chao, A.W. Estimate of the impedance due to wall surface roughness, article, May 1, 1997; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc699055/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.