| Paper | Title | Other Keywords | Page |
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| MOT4H6 | Simulations of Polarization Levels and Spin Tune Biases in High Energy Leptons Storage Rings | ion, polarization, wiggler, alignment | 43 |
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Funding: Work supported by Fermi Research Alliance LLC. Under DE-AC02-07CH11359 with the U.S. DOE Simulations of polarization levels and spin tune biases in high energy leptons storage rings The use of resonant depolarization has been suggested for precise beam energy measurements in the 100 km long Future Circular Collider e+e−. The principle behind resonant depolarization is that a vertically polarized beam excited through an oscillating horizontal magnetic field gets depolarized when the excitation frequency is in a given relationship with the beam energy. In this paper the possibility of self-polarized leptons at 45 and 80 GeV is investigated. Preliminary results of simulations in presence of quadrupole misalignments and beam position monitors (BPMs) errors for a simplified ring are presented. Even in presence of errors a level of polarization useful for energy calibration seems not out of reach. However it is crucial to demonstrate that a energy measurement precision better than 100 KeV can be actually obtained. The last ring layout with 1 mm vertical beta at the IPs has been also considered. The large vertical beta in the IR quadrupoles makes the closed orbit very sensitive to their vertical misalignment and the orbit correction procedure challenging. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT4H6 | ||
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| TUT1AH3 | The FCC-ee Interaction Region Magnet Design | ion, solenoid, detector, emittance | 57 |
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| The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (±15 mrad) in the high-field region of the detector solenoid. Moreover, the very low vertical beta' of the machine necessitates that the final focusing quadrupoles have a distance from the IP (L') of around 2 m and therefore are inside the main detector solenoid. The beams should be screened from the effect of the detector magnetic field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized, while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be eliminated. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH3 | ||
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| TUT3AH7 | Electron Cloud and Collective Effects in the Interaction Region of FCC-ee | ion, electron, impedance, simulation | 130 |
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| The FCC-ee is an e+e− circular collider designed to accommodate four different experiments in a beam energy range from 91 to 350 GeV and is a part of the Future Circular Collider (FCC) project at CERN. One of the most critical aspects of this new very challenging machine regards the collective effects which can produce instabilities, thus limiting the accelerator operation and reducing its performance. The following studies are focused on the Interaction Region of the machine. This talk will present preliminary simulation results of the power loss due to the wake fields generated by the electromagnetic interaction of the beam with the vacuum chamber. A preliminary estimation of the electron cloud build-up is also reported, whose effects have been recognized as one of the main limitations for the Large Hadron Collider at CERN. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH7 | ||
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| TUT3BH4 | Coupling and Dispersion Correction for the Tolerance Study in FCC-ee | ion, coupling, emittance, lattice | 151 |
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| The FCC-ee study is investigating the design of a 100 km e+/e− circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 1035 cm-2s-1. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 1.3 nm for εx and 2 pm for εy at 175~GeV, reducing the coupling ratio to around 2/1000. With such requirements, any field errors and sources of coupling will introduce spurious vertical dispersion which degrades emittances, limiting the luminosity of the machine. This study describes the status of the tolerance study and the impact of errors that will affect the vertical emittance. In order to preserve the FCC-ee performances, in particular εy, a challenging correction scheme based on dispersion free steering and linear coupling correction is proposed to keep the coupling and the vertical emittance as low as possible. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3BH4 | ||
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| THS1H4 | Summary of IR and MDI Session | ion, detector, solenoid, background | 200 |
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| A brief summary of talks in IR and MDI session is given. Also features and issues on the IR design in the future colliders are summarized. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-THS1H4 | ||
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