| Paper | Title | Page |
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| MOPAB215 | Using ICA for Retrieving Teng Parameters | 711 |
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| The blind source separation (BSS) method of Independent Component Analysis (ICA) is explored as a new approach for the reconstruction of the transfer matrix of Linear Coupling Parameterization. ICA is a method to detangle independent signals out of several measurements of their mixtures. In BSS-calculations, it is usually not possible to retrieve the mixing matrix, for the source signals, as well as the matrix, are unknown. Combining the parameterization model of D.A. Edwards and L.C. Teng with the standard ICA approach, it is though possible to retrieve the mixing matrix, as the form of the original uncoupled motion is known. At the same time arises the possibility to recalculate the parameters of Edwards and Teng through a system of equations of the one turn map components. It can be shown as a proof of concept, that the parameters can be reconstructed up to high accuracy for a simulated, non-perturbed signal. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB215 | |
| About • | paper received ※ 10 May 2021 paper accepted ※ 31 May 2021 issue date ※ 23 August 2021 | |
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| TUPAB027 | Review of Accelerator Limitations and Routes to Ultimate Beams | 1397 |
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Funding: This work was supported in part by the European Commission under the HORIZON 2020 project I.FAST, no. 101004730. Various physical and technology-dependent limits are encountered for key performance parameters of accelerators such as high-gradient acceleration, high-field bending, beam size, beam brightness, beam intensity and luminosity. This paper will review these limits and the associated challenges. Possible figures-of-merit and pathways to ultimate colliders will also be explored. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB027 | |
| About • | paper received ※ 16 May 2021 paper accepted ※ 02 August 2021 issue date ※ 23 August 2021 | |
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| THPAB189 | New Techniques to Compute the Linear Tune | 4142 |
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| Tune determination in numerical simulations is an essential aspect of nonlinear beam dynamics studies. In particular, because it allows probing whether an initial condition is close to resonance, and it enables assessment of the stability of the orbit, i.e. whether the motion is regular or chaotic. In this paper, results of recently developed techniques to obtain accurate tune computation from numerical simulation data are presented and discussed in detail. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB189 | |
| About • | paper received ※ 18 May 2021 paper accepted ※ 26 July 2021 issue date ※ 19 August 2021 | |
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| THPAB232 | Study of Nonlinear Properties of ESR via Tune Scans | 4250 |
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| The ESR storage ring at GSI is a key accelerator for the FAIR phase zero. This phase requires several highly specialized beam manipulations, which range from beam storage to deceleration of several ion species with the ultimate goal to provide intense highly charge ions to CRYRING. This plan will bring the ESR storage ring into a unique unexplored regime of accelerator operations where nonlinear dynamics, IBS, cooling, and high intensity will all become strongly interdependent. It is, therefore, necessary to acquire the best knowledge of the machine starting from its nonlinear dynamics properties. In this work, we present the development of a strategy to be used in the ESR, in which tune scans are used to explore the nonlinear properties of the accelerator. This approach is discussed with the help of simulations. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB232 | |
| About • | paper received ※ 13 May 2021 paper accepted ※ 13 July 2021 issue date ※ 25 August 2021 | |
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| THPAB233 | Could "Flakes" of Neutral Paramagnetic or Dipolar Molecules Explain Beam Losses in the LHC? | 4254 |
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| "Flakes" of neutral water or oxygen molecules carrying an electric or magnetic dipole moment can be attracted and trapped by the electromagnetic field of the circulating LHC proton beam. The possible presence of such flakes in the vacuum system could explain beam losses and beam instabilities encountered during the 2017 and 2018 LHC runs, and the observed effect of an external magnetic field. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB233 | |
| About • | paper received ※ 09 May 2021 paper accepted ※ 12 July 2021 issue date ※ 02 September 2021 | |
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