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1.
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The SuperKEKB Has Broken the World Record of the Luminosity
/ Funakoshi, Yoshihiro (KEK, Tsukuba) ; Abe, Tetsuo (KEK, Tsukuba) ; Akai, Kazunori (KEK, Tsukuba) ; Arimoto, Yasushi (KEK, Tsukuba) ; Egawa, Kazumi (KEK, Tsukuba) ; Enomoto, Shun (KEK, Tsukuba) ; Fukuma, Hitoshi (KEK, Tsukuba) ; Furukawa, Kazuro (KEK, Tsukuba) ; Iida, Naoko (KEK, Tsukuba) ; Ikeda, Hitomi (KEK, Tsukuba) et al.
The SuperKEKB broke the world record of the luminosity in June 2020 in the Phase 3 operation. The luminosity has been increasing since then and the present highest luminosity is 4.65 x 10³⁴ cm⁻²s⁻¹ with β_{y}^{*} of 1 mm. [...]
2022 - 5 p.
- Published in : JACoW IPAC 2022 (2022) 1-5
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1-5
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2.
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Electron cloud effects in SuperKEKB commissioning
/ Ohmi, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Flanagan, J (KEK, Tsukuba ; Sokendai, Tsukuba) ; Fukuma, H (KEK, Tsukuba ; Sokendai, Tsukuba) ; Ikeda, H (KEK, Tsukuba ; Sokendai, Tsukuba) ; Mulyani, E (KEK, Tsukuba ; Sokendai, Tsukuba) ; Shibata, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Suetsugu, Y (KEK, Tsukuba ; Sokendai, Tsukuba) ; Tobiyama, M (KEK, Tsukuba ; Sokendai, Tsukuba)
A vertical emittance growth (beam size blow-up) due to electron cloud has been observed in the positron low energy ring (LER) in Phase-I commissioning (2016) of SuperKEKB. The emittance growth is caused by fast head-tail instability due to wake force induced by electron cloud. [...]
2020 - 4 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.179-182 (CERN-2020-007)
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3.
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Electron cloud effect and its cures in the SuperKEKB positron ring
/ Suetsugu, Y (KEK, Tsukuba) ; Fukuma, H (KEK, Tsukuba) ; Ohmi, K (KEK, Tsukuba) ; Tobiyama, M (KEK, Tsukuba) ; Shibata, K (KEK, Tsukuba)
Various countermeasures against the electron cloud effect (ECE) were adopted for the positron ring of SuperKEKB. During Phase-1 commissioning from February to June 2016, however, the ECE was observed, such as a blow up of the vertical beam size. [...]
2020 - 7 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.201-208 (CERN-2020-007)
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4.
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First Measurements of Beam Backgrounds at SuperKEKB
/ Vahsen, S.E. (University of Hawaii) ; Lewis, P.M. (University of Hawaii) ; Jaegle, I. (University of Florida) ; Nakayama, H. (KEK) ; Aloisio, A. (University of Naples Federico II & INFN Napoli) ; Ameli, F. (INFN Roma) ; Barrett, M. (Wayne State University) ; Beaulieu, A. (University of Victoria) ; Bosisio, L. (University of Trieste & INFN) ; Branchini, P. (INFN Roma) et al.
The high design luminosity of the SuperKEKB electron-positron collider is expected to result in challenging levels of beam-induced backgrounds in the interaction region. Properly simulating and mitigating these backgrounds is critical to the success of the Belle~II experiment. [...]
AIDA-2020-PUB-2018-005.-
Geneva : CERN, 2018
- Published in : Nucl. Instrum. Methods Phys. Res., Sect. A
Fulltext: PDF;
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5.
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High-Intensity Synchrotron Radiation Effects
/ Suetsugu, Y. (KEK, Tsukuba)
Various effects of intense synchrotron radiation on the performance of particle accelerators, especially for storage rings, are discussed. Following a brief introduction to synchrotron radiation, the basic concepts of heat load, gas load, electron emission, and the countermeasures against these effects are discussed..
arXiv:1608.02462.-
2016 - 20 p.
- Published in : (2016) , pp. 63-82
Preprint: PDF; External link: Preprint
In : 2014 Joint International Accelerator School: Beam Loss and Accelerator Protection, pp.63-82
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6.
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Achievements of KEKB
/ Abe, Tetsuo (KEK, Tsukuba) ; Akai, Kazunori (KEK, Tsukuba) ; Akasaka, Norimasa (KEK, Tsukuba) ; Akemoto, Mitsuo (KEK, Tsukuba) ; Akiyama, Atsuyoshi (KEK, Tsukuba) ; Arinaga, Mitsuhiro (KEK, Tsukuba) ; Cai, Yunhai (SLAC) ; Ebihara, Kiyokazu (KEK, Tsukuba) ; Egawa, Kazumi (KEK, Tsukuba) ; Enomoto, Atsushi (KEK, Tsukuba) et al.
The machine commissioning of KEKB started in December 1998 and its operation was terminated at the end of June 2010 to upgrade KEKB to SuperKEKB. In this paper, we summarize the history of KEKB and show the achievements made there..
2013
- Published in : Prog. Theor. Exp. Phys. 2013 (2013) 03A001
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7.
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Study of vertical beam blowup in KEKB low energy ring
/ Fukuma, H (KEK, Tsukuba) ; Akai, K (KEK, Tsukuba) ; Akasaka, N (KEK, Tsukuba) ; Enomoto, A (KEK, Tsukuba) ; Flanagan, J W (KEK, Tsukuba) ; Funakoshi, Y (KEK, Tsukuba) ; Furukawa, K (KEK, Tsukuba) ; Hiramatsu, S (KEK, Tsukuba) ; Hosoyama, K (KEK, Tsukuba) ; Ieiri, T (KEK, Tsukuba) et al.
2001
Published version: PDF;
In : 18th International Conference on High-energy Accelerators, Tsukuba, Japan, 26 - 30 Mar 2001, pp.P1hlf10
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8.
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Recommendation for Mitigations of the Electron Cloud Instability in the ILC
/ Pivi, MTF (SLAC) ; Wang, L (SLAC) ; Demma, T (Franscati ; KEK, Tsukuba) ; Guiducci, S (Franscati ; KEK, Tsukuba) ; Suetsugu, Y (Franscati ; KEK, Tsukuba) ; Shibata, K (Franscati ; KEK, Tsukuba) ; Ohmi, K (Franscati ; KEK, Tsukuba) ; Dugan, G (Cornell U.) ; Palmer, M (Cornell U.) ; Crittenden, J A (Cornell U.) et al.
SLAC-PUB-14611.-
2011 - 3 p.
External links: SLAC; Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.TUPC030
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9.
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Electron Cloud at Low Emittance in CesrTA
/ Palmer, Mark (Cornell U., CLASSE) ; Alexander, James (Cornell U., CLASSE) ; Billing, Michael (Cornell U., CLASSE) ; Calvey, Joseph (Cornell U., CLASSE) ; Conolly, Christopher (Cornell U., CLASSE) ; Crittenden, James (Cornell U., CLASSE) ; Dobbins, John (Cornell U., CLASSE) ; Dugan, Gerald (Cornell U., CLASSE) ; Eggert, Nicholas (Cornell U., CLASSE) ; Fontes, Ernest (Cornell U., CLASSE) et al.
The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUYMH02
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10.
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Recommendation for the Feasibility of more Compact LC Damping Rings
/ Pivi, M.T.F. (SLAC) ; Wang, L. (SLAC) ; Demma, T. (Frascati) ; Guiducci, S. (Frascati) ; Suetsugu, Y. (KEK, Tsukuba) ; Shibata, K. (KEK, Tsukuba) ; Ohmi, K. (KEK, Tsukuba) ; Dugan, G. (Cornell U.) ; Palmer, M. (Cornell U.) ; Crittenden, J.A. (Cornell U.) et al.
As part of the international Linear Collider (ILC) collaboration, we have compared the electron cloud (EC) effect for different Damping Ring (DR) designs respectively with 6.4 km and 3.2 km circumference and investigated the feasibility of the shorter damping ring with respect to the electron cloud build-up and related beam instabilities. The studies for a 3.2 km ring were carried out with beam parameters of the ILC Low Power option [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPE097
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