Limitations of interaction-point spot-size tuning at the SLC

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At the Stanford Linear Collider (SLC), the interaction-point spot size is minimized by repeatedly correcting, for both beams, various low-order optical aberrations, such as dispersion, waist position or coupling. These corrections are performed about every 8 hours, by minimizing the IP spot size while exciting different orthogonal combinations of final-focus magnets. The spot size itself is determined by measuring the beam deflection angle as a function of the beam-beam separation. Additional information is derived from the energy loss due to beamstrahlung and from luminosity-related signals. In the 1996 SLC run, the typical corrections were so large as to imply a ... continued below

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5 p.

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Emma, P.; Hendrickson, L.J.; Zimmermann, F. & Raimondi, P. May 1, 1997.

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At the Stanford Linear Collider (SLC), the interaction-point spot size is minimized by repeatedly correcting, for both beams, various low-order optical aberrations, such as dispersion, waist position or coupling. These corrections are performed about every 8 hours, by minimizing the IP spot size while exciting different orthogonal combinations of final-focus magnets. The spot size itself is determined by measuring the beam deflection angle as a function of the beam-beam separation. Additional information is derived from the energy loss due to beamstrahlung and from luminosity-related signals. In the 1996 SLC run, the typical corrections were so large as to imply a 20-40% average luminosity loss due to residual uncompensated or fluctuating tunable aberrations. In this paper, the authors explore the origin of these large tuning corrections and study possible mitigations for the next SLC run.

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5 p.

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INIS; OSTI as DE97006826

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

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  • Other: DE97006826
  • Report No.: SLAC-PUB--7509
  • Report No.: CONF-970503--183
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 513538
  • Archival Resource Key: ark:/67531/metadc695384

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  • May 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 2, 2016, 5:36 p.m.

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Emma, P.; Hendrickson, L.J.; Zimmermann, F. & Raimondi, P. Limitations of interaction-point spot-size tuning at the SLC, article, May 1, 1997; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc695384/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.