Difference: FJPPLAccelerateurRD (18 vs. 19)
Revision 192018-12-06 - Main.IsabelleRippBaudot
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| < < | The SuperKEKB e+e- collider is designed to provide a very high luminosity for the Belle-II experiment, using the recently proposed nano-beam scheme. In this context, the fast luminosity monitoring collaboration aims to develop a reliable instrumentation to measure the luminosity and provide fast input for luminosity feedback corrections as well as for luminosity optimization. The measurements are based on the detection of the positrons and photons arising from the Bhabha process at zero degree scattering angle, which offers a significant amount of signal. The fast luminosity monitors are located ten and thirty meters downstream of the interaction point in the low and high energy rings, respectively, just immediately outside the beam-pipe. In the low energy ring, as special beam pipe shape was designed to maximise the range of signal strengths available for the different luminosity levels expected with SuperKEKB. Several kind of detectors have been developed, based on complementary technologies, namely scintillator, Cerenkov and diamond, all requiring fast readout electronics to enable measuring both average luminosities over all bunches and bunch-by-bunch. | |||||||
| > > | The SuperKEKB e+e- collider is designed to provide a very high luminosity for the Belle-II experiment, using the recently proposed nano-beam scheme. In this context, the fast luminosity monitoring collaboration aims to develop a reliable instrumentation to measure the luminosity and provide fast input for luminosity feedback corrections as well as for beam size minimisation at the IP, as part of the overall luminosity optimization process. The measurements are based on the detection of the positrons and photons arising from the Bhabha process at vanishing scattering angle, which offers a significant amount of signal. The fast luminosity monitors are located ten and thirty meters downstream of the interaction point in the low and high energy rings, respectively, just immediately outside the beam-pipe. In the low energy ring, a special beam pipe shape was designed to maximise the range of signal strengths available for the different luminosity levels expected with SuperKEKB. Several kind of detectors have been developed, based on complementary technologies, namely scintillator and Cherenkov (ZDLM project) and diamond (LumiBelle2 project), all requiring fast readout electronics to enable measuring averaged luminosities, both integrated over all bunches and bunch-by-bunch. The luminosity monitoring was operated successfully during the entire Phase 2 commissioning of SuperKEKB, and is presently being improved in preparation for the higher luminosities expected during Phase 3. | |||||||
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French members: | ||||||||
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| < < | C. Rimbault, Ph. Bambade, S. di Carlo, D. Jehanno, V. Kubytskyi, Y. Peinaud | |||||||
| > > | C. Rimbault, Ph. Bambade, S. di Carlo, D. Jehanno, V. Kubytskyi, C.-G. Pang, Y. Peinaud | |||||||
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Japanese members: S. Uehara, Y. Funakoshi, T. Kawamoto, M. Masuzawa, T. Oki References: | ||||||||
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| < < | [1] C. Pang, P. Bambade, D. El Khechen, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault, “Preparation of CVD Diamond Detector for fast Luminosity Monitoring of SuperKEKB”, Proceedings of the 8th International Particle Accelerator Conference (IPAC2017), Copenhagen, Denmark, 14-19 May 2017. [2] Y. Funakoshi et al., "Recent Progress of Dithering System at SuperKEKB", Proceedings of the 8th International Particle Accelerator Conference (IPAC2017), Copenhagen, Denmark, 14-19 May 2017. [3] D. El Khechen et al., "First Tests of SuperKEKB Luminosity Monitors during 2016 Single Beam Commissioning”, Proceedings of the 7th International Particle Accelerator Conference (IPAC2016), Busan, Korea, 8-13 May 2016. [4] Y. Funakoshi et al., "Beam Commissioning of SuperKEKB”, Proceedings of the 7th International Particle Accelerator Conference (IPAC2016), Busan, Korea, 8-13 May 2016. | |||||||
| > > | [1] "Early Phase 2 Results of LumiBelle2 for the SuperKEKB Electron Ring", by S. Di Carlo et al.: THYGBE4, presented at the 9th International Particle Accelerator Conference (IPAC 2018), Vancouver, Canada, 29 April - 4 May 2018. Published in J.Phys.Conf.Ser. 1067 (2018) no.7, 072025. [2] "First Tests of SuperKEKB Fast Luminosity Monitors During 2018 Phase-2 Commissioning", by C. Pang et al.: WEPAL038, presented at the 9th International Particle Accelerator Conference (IPAC 2018), Vancouver, Canada, 29 April - 4 May 2018. [3] "Simulation Study on Luminosity Feedback for Horizontal Beam Stabilization at SuperKEKB", by C. Pang et al.: WEPAL037, presented at the 9th International Particle Accelerator Conference (IPAC 2018), Vancouver, Canada, 29 April - 4 May 2018. Published in J.Phys.Conf.Ser. 1067 (2018) no.7, 072023. | |||||||
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Website: http://www-superkekb.kek.jp/ | ||||||||
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