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Coupled-bunch instabilities and related effects due to electron cloud in SuperKEKB LER / Tobiyama, Makoto (KEK, Tsukuba ; Sokendai, Tsukuba)
Coupled-bunch instabilities due to electron cloud effect have been observed in KEKB LER. The effect was clearly explained by the electron cloud effect (ECE) in the drift space by the numerical simulations. [...]
Geneva : CERN, 2020 - 6 p. Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.21-26 (CERN-2020-007)

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Early Commissioning of the Luminosity Dither Feedback for SuperKEKB / Masuzawa, Mika (KEK, Tsukuba) ; Bambade, Philip (Orsay, LAL) ; Brown, David (SLAC) ; Di Carlo, Salvatore (Orsay, LAL) ; El Khechen, Dima (CERN) ; Fisher, Alan (SLAC) ; Funakoshi, Yoshihiro (KEK, Tsukuba) ; Jehanno, Didier (Orsay, LAL) ; Kawamoto, Takashi (KEK, Tsukuba) ; Nakamura, Shu (KEK, Tsukuba) et al.
SuperKEKB is an electron–positron double ring collider that aims to achieve a peak luminosity of 8 x 10$^{35}$ cm$^{-2}$ s$^{-1}$ by using what is known as the “nano-beam” scheme. A luminosity dither system is employed for collision orbit feedback in the horizontal plane. [...]
JACoW, 2019 - 4 p. - Published in : 10.18429/JACoW-IBIC2018-TUPC13 Published fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.TUPC13

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Benchmarking of Simulations of Coherent Beam-beam Instability with SuperKERKB Measurement / Ohmi, Kazuhito (KEK, Tsukuba) ; El Khechen, Dima (CERN) ; Hirosawa, Kouki (Sokendai, Tsukuba) ; Koiso, Haruyo (KEK, Tsukuba) ; Ohnishi, Yukiyoshi (KEK, Tsukuba)
Coherent beam-beam instability in head-tail mode has been predicted in collision with a large crossing angle. The instability is serious for design of future e⁺e⁻ colliders based on the large crossing angle collision. [...]
JACOW, 2019 - 3 p. - Published in : 10.18429/JACoW-eeFACT2018-TUYBA01 Fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.TUYBA01

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Off-momentum Optics at SuperKEKB / Ohnishi, Yukiyoshi (KEK, Tsukuba) ; Koiso, Haruyo (KEK, Tsukuba) ; Morita, Akio (KEK, Tsukuba) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Oide, Katsunobu (CERN) ; Sugimoto, Hiroshi (KEK, Tsukuba)
The nano-beam scheme can squeeze the vertical beta function at the IP much smaller than the bunch length. It implies that the large chromaticity is generated in the vicinity of the final focus quadrupole magnets and the strong sextupoles are adopted to correct the chromaticity, for instance the local chromaticity corrections. [...]
JACOW, 2019 - 5 p. - Published in : 10.18429/JACoW-eeFACT2018-TUOBB02 Fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.TUOBB02

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Early Commissioning of the Luminosity Dither System for SuperKEKB / Funakoshi, Yoshihiro (KEK, Tsukuba) ; Bambade, Philip (Orsay, LAL) ; Brown, David (SLAC) ; Di Carlo, Salvatore (Orsay, LAL) ; El Khechen, Dima (CERN) ; Fisher, Alan (SLAC) ; Jehanno, Didier (Orsay, LAL) ; Kawamoto, Takashi (KEK, Tsukuba) ; Masuzawa, Mika (KEK, Tsukuba) ; Nakamura, Shu (KEK, Tsukuba) et al.
SuperKEKB is an electron-positron double ring collider at KEK which aims at a peak luminosity of 8 x 10³⁵ cm⁻²s⁻¹ by using what is known as the ’nano-beam’ scheme. A luminosity dither system is employed for collision orbit feedback in the horizontal plane. [...]
JACOW, 2019 - 5 p. - Published in : 10.18429/JACoW-eeFACT2018-WEXBA04 Published fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.WEXBA04

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Measuring $β^*$ in SuperKEKB with $K$ modulation / Thrane, P (Norwegian U. Sci. Tech. ; CERN) ; Tomás, R (CERN) ; Koval, A (Dundee U. ; CERN) ; Ohmi, K (KEK, Tsukuba) ; Ohnishi, Y (KEK, Tsukuba) ; Wegscheider, A (Hamburg U. ; CERN)
SuperKEKB is an asymmetric energy electron positrion collider currently under commissioning in Japan. It aims to achieve a record high luminosity of $8×10^{35} \mathrm{cm}^{-2} \mathrm{s}^{-1}$, for which accurate control of $β^{*}_{\mathrm{y}}$ is needed. [...]
2020 - 14 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 012803 Fulltext: PDF;

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