Parasitic crossing at an asymmetric B factory, APIARY

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Effects of parasitic crossings ( near miss'' collisions of two counter-rotating beams at unwanted positions near the IP) are studied in terms of computer simulations for an asymmetric B Factory, APIARY- 6.3d. Beams are separated horizontally at the first parasitic crossing points by about 7.6 times the horizontal rms size of the low energy beam (the larger in size of the two beams), {sigma}{sub 0x,+}. Simulations, including both the beam collision at the IP and parasitic crossings, have been performed for different separation distances, d. It is found that the ratio d/{sigma}{sub 0x,+} is a good scaling parameter of beam ... continued below

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Pages: (6 p)

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Chin, Y.H. May 1, 1991.

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Effects of parasitic crossings ( near miss'' collisions of two counter-rotating beams at unwanted positions near the IP) are studied in terms of computer simulations for an asymmetric B Factory, APIARY- 6.3d. Beams are separated horizontally at the first parasitic crossing points by about 7.6 times the horizontal rms size of the low energy beam (the larger in size of the two beams), {sigma}{sub 0x,+}. Simulations, including both the beam collision at the IP and parasitic crossings, have been performed for different separation distances, d. It is found that the ratio d/{sigma}{sub 0x,+} is a good scaling parameter of beam blowup behavior. The results show that beam blowup due to the parasitic crossings is diminished for d {ge} 7{sigma}{sub 0x,+}, in agreement with the bunch separation experiment at CESR. Thus, the nominal separation 7.6 {sigma}{sub 0x,+} turns out to be acceptable, but with only a small margin. Some methods to mitigate the effects of the parasitic crossings are discussed. 3 refs. , 5 figs., 2 tabs.

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Pages: (6 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 1991 Institute of Electrical and Electronics Engineers (IEEE) particle accelerator conference (PAC), San Francisco, CA (USA), 6-9 May 1991

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  • Other: DE91013750
  • Report No.: LBL-30701
  • Report No.: ESG--135
  • Report No.: CONF-910505--207
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5773815
  • Archival Resource Key: ark:/67531/metadc1098381

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Office of Scientific & Technical Information Technical Reports

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  • May 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • April 25, 2018, 1:06 p.m.

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Chin, Y.H. Parasitic crossing at an asymmetric B factory, APIARY, article, May 1, 1991; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1098381/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.