Injection Related Background due to the Transverse Feedback

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The background in the BaBar detector is especially high during injection, when most components are actually having reduced voltages. The situation is worse for the beam in High Energy Ring (HER) when the LER beam is present. It was found that the transverse feedback system plays an important role when stacking more charge on top of existing bunches. Lowering the feedback gain helped and it was realized later that the best scenario would be to gate off the feedback for only the one bunch, which got additional charge injected into it. The explanation is that the blown-up, but centered, original ... continued below

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Decker, F.J.; Akre, R.; Fisher, A.; Iverson, R.; Weaver, M. & /SLAC March 18, 2008.

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The background in the BaBar detector is especially high during injection, when most components are actually having reduced voltages. The situation is worse for the beam in High Energy Ring (HER) when the LER beam is present. It was found that the transverse feedback system plays an important role when stacking more charge on top of existing bunches. Lowering the feedback gain helped and it was realized later that the best scenario would be to gate off the feedback for only the one bunch, which got additional charge injected into it. The explanation is that the blown-up, but centered, original HER bunch plus the small injected off-axis bunch (each with half the charge) would stay in the ring if not touched, but the feedback system sees half the offset and wants to correct it, therefore disturbing and scraping the blown-up part.

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  • Journal Name: Conf.Proc.C030512:2285,2003; Conference: Particle Accelerator Conference (PAC 03) 12-16 May 2003, Portland, Oregon

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  • Report No.: SLAC-PUB-13182
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 925780
  • Archival Resource Key: ark:/67531/metadc902756

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Office of Scientific & Technical Information Technical Reports

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  • March 18, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 5, 2016, 9:22 p.m.

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Decker, F.J.; Akre, R.; Fisher, A.; Iverson, R.; Weaver, M. & /SLAC. Injection Related Background due to the Transverse Feedback, article, March 18, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc902756/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.