Difference: FJPPLAccelerateurRD (13 vs. 14)
Revision 142017-09-04 - Main.PhilipBambade
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Summary : High intensity photon beams have various applications in advanced accelerators, from medical imagery (X-rays) to high energy physics (polarized positron beams, photon colliders) passing by nuclear physics (fundamental and applied). They can be obtained by laser-Compton backscattering off electrons, the main advantage being the possibility to produce high flux monochromatic photon beams. In this context, an optical cavity is a unique system to reach the requested laser beam power at high repetition rates. LAL and KEK are developing such light sources and are trying to push forward the technical limits to increase the maximal power stored in these optical cavities. | ||||||||
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| < < | Magnetic shielding is a key technology for super-conducting RF cavities.It is necessary to optimize the shielding method, including the choice of materials and the shape of the magnetic shield, and to establish a method for quality control suitable for large-scale production.We plan to continue to evaluate the permeability of various shielding materials, and also investigate possible causes for the performance degradation of the shielding material at cryogenic temperature. We would also like to study the dependence of cavity performance on the permeability | |||||||
| > > | 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. | |||||||
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| < < | J. Plouin, E. Cenni, O. Napoly
Japanese members : K. Umemori, T. Kubo, M. Masuzawa, K. Tsuchiya References : [1] Mika Masuzawa, et al. “Study of Magnetic Shielding Materials and Fabrication of Magnetic Shield for Superconducting Cavities” IEEE Transactions on Applied Superconductivity, 2014. Volume: 24, Issue: 3 [2] Mika Masuzawa, Juliette Plouin, et al. “MAGNETIC SHIELDING: OUR EXPERIENCE WITH VARIOUS SHIELDING MATERIALS”, Proc. For SRF2013, Paris, 2013. [3] Juliette Plouin, “Magnetic Shielding Activities for IFMIF/CEA and Study on the Magnetic Shielding in the FJPPL Collaboration”, presented at “MSU FRIB Workshop on Magnetic Shielding for Cryomodules” Feb.4-6, 2013. [4] Mika Masuzawa, et al. “Magnetic Properties of Shielding Materials for Superconducting Cavities” IEEE Transactions on Applied Superconductivity, 2012. Volume: 22, Issue: 3 SuperKEKB e+e- collider is designed to provide a very high luminosity for Belle-II experiment, using 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 phase. The measurements are based on the detection of the electron or positron arising from the Bhabha scattering process at zero degree photon angle, which offers a significant amount of signal. The fast luminosity monitoring system will be set ten to thirty meters downstream of the interaction point, ideally both in the High and Low energy rings, just immediately outside the beam-pipe. Several kind of detectors are under development, combining thus complementary technologies, namely scintillator, Cerenkov counter and diamond sensor, all requiring fast readout electronics enabling both the measurements of the whole-ring averaged luminosity and the bunch by bunch luminosity. French members : *C. Rimbault *, Ph. Bambade, D. Jehanno, V. Kubytskyi, Y. Peinaud | |||||||
| > > | C. Rimbault, Ph. Bambade, S. di Carlo, D. Jehanno, V. Kubytskyi, Y. Peinaud | |||||||
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Japanese members : S. Uehara, Y. Funakoshi, T. Kawamoto, M. Masuzawa, T. Oki References : | ||||||||
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| < < | [1] D. El Khechen, C. Rimbault, P. Bambade, “Fast Luminosity Monitoring using diamond sensors for the Super Flavour Factories SuperKEKB”, proceeding for the 5th International Particle Accelerator Conference (IPAC2014), Dresden, Germany, 15-20 June 2014. [2]"First Tests of SuperKEKB Luminosity Monitors during 2016 Single Beam Commissioning” （Dima El Khechen et al.） Proceedings of IPAC2016, May 8 -13, 2016, Busan, Korea. [3] "BEAM COMMISSIONING OF SuperKEKB" （Y. Funakoshi et al.） Proceedings of IPAC2016, May 8 -13, 2016, Busan, Korea. | |||||||
| > > | [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. | |||||||
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| < < | https://www.belle2.org/ | |||||||
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Summary : KEK and CEA/Irfu are pursuing their effort to improve technology related to ILC cavity production/surface treatment. Presently, main steps studied are : | ||||||||
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| [10] Renjun Yang et al., Theoretical Study of Beam Tail Formation in the Accelerator Test Facility of KEK, IPAC2017 | ||||||||
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| < < | Website : http://lcdev.kek.jp/ATF2/ | |||||||
| > > | Website : http://lcdev.kek.jp/ATF2/ http://atf.kek.jp/twiki/bin/view/Public/TopPageE?redirectedfrom=Public.WebHome | |||||||
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| [2] Y. Yamamoto, H. Hayano, E. Kako, S. Noguchi, M. Sato, T. Shishido, K. Umemori, and K. Watanabe, in Proceeding PAC (2009). [3] Y. Yamamoto, H. Hayano, E. Kako, S. Noguchi, T. Shishido, K. Umemori, K. Watanabe, H. Sakai, K. Shinoe, and S. I. Moon, SRF2007 Peking Univ Beijing China (2007). | ||||||||
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| < < | Website | |||||||
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