Paper | Title | Page |
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MOPAB274 | Two-Stream Effects in Coherent Beam-Beam Oscillations in VEPP-2000 Collider Near the Linear Coupling Resonance | 866 |
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Synchro-betatron motion of colliding bunches may cause limitations of the high-luminosity performance. For a round beam collider operated near the linear coupling resonance, we present theoretical predictions of the beam-beam coherent synchro-betatron oscillation behavior under the influence of x-y coupling. | ||
Poster MOPAB274 [0.968 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB274 | |
About • | paper received ※ 19 May 2021 paper accepted ※ 02 June 2021 issue date ※ 02 September 2021 | |
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TUXA05 | Measurements of Beam-Beam Interactions in Gear-Changing Collisions in DESIREE | 1283 |
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Funding: Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The U.S. Government retains a license to publish or reproduce this manuscript. In this work, we perform measurements on the interactions of colliding beams in a gear-changing system. Gear-changing was first demonstrated in DESIREE in May of 2020 and showed several promising avenues to measure beam-beam effects. DESIREE has a unique collision scheme where the beams are moving in the same direction, which provides for unique interactions. This experiment used a 4 on 3 gear changing system with one bucket in each ring left empty, this allows us to see the bunch profile while undergoing collisions. We then measured the bunch length over time and used a Fourier transform to extract longitudinal evolution data and compared it to baseline data of uncollided beams. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUXA05 | |
About • | paper received ※ 21 May 2021 paper accepted ※ 14 June 2021 issue date ※ 26 August 2021 | |
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WEPAB252 | Transient Beam-Beam Effect During Electron Bunch Replacement in the EIC | 3228 |
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The high luminosity, high polarization electron-ion collider (EIC) will provide great opportunities in nuclear physics study. In order to maintain high polarization, the electron beam will be replaced every few minutes during the collider operation. This frequent replacement of electron beams can affect proton beam quality during the collision. In this paper, we report on the study of the transient effect of electron beam replacement on proton beam emittance growth through strong-strong beam-beam simulation. The effect of electron beam injection imperfection will be included in the study. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB252 | |
About • | paper received ※ 17 May 2021 paper accepted ※ 21 June 2021 issue date ※ 02 September 2021 | |
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WEPAB278 | Beam-Beam Simulations for Lepton-Hadron Colliders: ALOHEP Software | 3293 |
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It is known that rough luminosity estimations for ll, lh, and hh colliders can be performed easily using nominal beam parameters. In principle, more precise results can be obtained by analytical solutions. However, beam dynamics is usually neglected in this case since it is almost impossible to cope with beam size fluctuations. In this respect, several beam-beam simulation programs for linear e+e− and photon colliders have been proposed while no similar open-access simulation exists for all types of colliders (i.e. linac-ring ep colliders). Here, we present the software ALOHEP (A Luminosity Optimizer for High Energy Physics), a luminosity calculator for linac-ring and ring-ring lh colliders, which also computes IP parameters such as beam-beam tune shift, disruption arising out of electromagnetic interactions. In addition, the program allows taking crossing-angle effects on luminosity into account.
* Y.C. Acar et al., Nucl. Instrum. Meth. A, 871 (2017). |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB278 | |
About • | paper received ※ 19 May 2021 paper accepted ※ 26 July 2021 issue date ※ 27 August 2021 | |
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WEPAB279 | On Wire-Corrector Optimization in the HL-LHC and the Appearance of Special Aspect Ratios | 3297 |
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For the two high-luminosity insertions of the Large Hadron Collider (HL-LHC) current bearing wire correctors are intended to mitigate the detrimental effect of long-range beam-beam interactions. With respect to finding the optimum longitudinal location of the wire, two special locations corresponding to the special values 2 and 1/2 of the beta-function aspect ratio have been previously shown to provide simultaneous cancellation of multiple two-dimensional Resonance Driving Terms. This paper attempts to explain the appearance of such special aspect ratios. | ||
Poster WEPAB279 [1.238 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB279 | |
About • | paper received ※ 14 May 2021 paper accepted ※ 19 July 2021 issue date ※ 13 August 2021 | |
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WEPAB280 | Two-Dimensional Beam-Beam Invariant with Applications to HL-LHC | 3301 |
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Long-range beam-beam interactions represent the most severe limitation on the performance and achievable luminosity of circular collider. The paper presents a two-dimensional nonlinear Courant Snyder Invariant derived to first order in the beam-beam perturbation and based on the two-dimensional coefficients in the Fourier expansion of the Beam-beam Hamiltonian. Its validity in case of HL-LHC lattices with realistic beam-beam setup is verified with MadX tracking. | ||
Poster WEPAB280 [1.235 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB280 | |
About • | paper received ※ 14 May 2021 paper accepted ※ 06 July 2021 issue date ※ 12 August 2021 | |
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THPAB119 | Many-Objective Beam Dynamics Optimization for High-Repetition-Rate XFEL Photoinjector | 3991 |
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SHINE, as the first hard x-ray free-electron-laser (FEL) facility in China, is design to provide high-brightness FEL lasing under high-repetition-rate operation. In order to drive x-ray FEL pulses with high qualities, the photoinjector section is deployed to provide the specified electron beam with low transverse emittance and high brightness. Normally the multi-objective optimization algorithm is employed in the injector beam dynamics design. In this paper, the many-objective optimization algorithm NSGA-III is introduced to the injector physical design for optimizing the 4 detailed beam quality properties using 17 variables for the first time. The results of the optimization are presented and the correlations are analyzed. This approach can provide guidance for further physical research as well as improve the beam dynamics optimization efficiency. | ||
Poster THPAB119 [0.936 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB119 | |
About • | paper received ※ 17 May 2021 paper accepted ※ 07 July 2021 issue date ※ 22 August 2021 | |
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