| Paper |
Title |
Page |
| TUPRI020 |
Study of Electron Cloud Effects in SuperKEKB |
1597 |
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- K. Ohmi, D. Zhou
KEK, Ibaraki, Japan
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In SuperKEKB, high beta section exists in the interaction region. Fast head-tail instability and incoherent emittance growth due to electron cloud are enhanced in the high beta section. Especially high beta sections are located every betatron phase advance pi. Nonlinear force due to electron cloud is coherently accumulated. Incoherent eminence growth dominates.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI020
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| TUPRI021 |
Impedance Calculation and Simulation of Microwave Instability for the Main Rings of SuperKEKB |
1600 |
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- D. Zhou, T. Abe, T. Ishibashi, Y. Morita, K. Ohmi, K. Shibata, Y. Suetsugu, M. Tobiyama
KEK, Ibaraki, Japan
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The SuperKEKB B-factory is now under construction. The designs of the components for the SuperKEKB have mostly been finished. This paper summarises the updated results of longitudinal impedance calculations for various components of the main rings. By summing up all available impedances, a pseudo-Green wake function with bunch length of σz=0.5 mm is constructed as an impedance model for consequent studies of collective effects. The results of these studies are also reported in this paper.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI021
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| TUPRI022 |
Beam-Beam Studies in LHC- Beam Loss and Bunch Shortening |
1603 |
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- K. Ohmi
KEK, Ibaraki, Japan
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In Hadron colliders, luminosity degrade various mechanism. Beam-beam related emittance growth is caused by resonances induced by crossing angle. Tune spread due to chromaticity enhances the resonances effect. A bunch shortening phenomenon related to beam-beam interaction has been observed in LHC. The bunch length has an anti-correlation with transverse emittance. This phenomenon has been studied using a weak-strong beam-beam simulation (BBWS code).
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI022
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| WEPRO066 |
Study for Space Charge effect in tune space at J-PARC MR |
2100 |
| |
- K. Ohmi, S. Igarashi
KEK, Ibaraki, Japan
- H. Harada
JAEA, Ibaraki-ken, Japan
- Y. Sato
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
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Choice of tune operating point is serious for operation of high intensity proton machine. Space charge force induces tune spread and nonlinear resonance. Nonlinear resonances are also contained in accelerator lattice. We discuss optimization of operating point based on space charge simulation in J-PARC Main Ring.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO066
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| THPRI003 |
Beam-beam Simulation Study for CEPC |
3763 |
| |
- Y. Zhang
IHEP, Beijing, People's Republic of China
- K. Ohmi, D. Zhou
KEK, Ibaraki, Japan
- D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia
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CEPC is an Circular Electron Positron Collider proposed to carry out high precision study on Higgs bosons. It is similar to TLEP project , the luminosity and beam lifetime may be determined by the beamstrahlung effect. We try to check the resonability of the machine parameters with weak-strong and strong-strong simulation. At the same time we also do some cross-check between different codes. We wish the work could help determine the beam parameters which could achieve design luminosity.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI003
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| THPRI004 |
FCC-ee/CepC Beam-beam Simulations with Beamstrahlung |
3766 |
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- K. Ohmi
KEK, Ibaraki, Japan
- F. Zimmermann
CERN, Geneva, Switzerland
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Beamstrahlung, namely synchrotron radiation emitted during the beam-beam collision, can be an important effect for circular high-energy lepton colliders such as FCC-ee (TLEP). In this paper we study beam-beam effects in the presence of energy spreading and bunch lengthening due to beamstrahlung.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI004
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