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| WEPMN007 | Introducing a Homepage for Information Retrieval and Backup of the Ground Vibration Measurements and Mechanical Vibrations of the Superconducting Modules at DESY | site, background, synchrotron, synchrotron-radiation | 2059 | ||
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Funding: Work supported by the Commission of the European Communities under the 6th Framework Program Structuring the European Research Area, contract number RIDS-011899. |
In this paper, we will introduce our homepage (http://vibration.desy.de) which is used for the storage and dissemination of our ground motion measurement data of 20 sites around the world and the XFEL/ILC superconducting module data. This homepage is open to the scientific community and the data can be utilized for planning of future accelerator facilities and design of future prototypes of module vessels containing cold mass. |
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| WEPMN008 | Vibration Stability Studies of a Superconducting Accelerating Module at Room Temperature | quadrupole, vacuum, resonance, site | 2062 | ||
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Funding: Work supported by the Commission of the European Communities under the 6th Framework Program Structuring the European Research Area, contract number RIDS-011899. |
In this presentation, we will report on a comprehensive vibration measurement program of a superconducting accelerating module designed for the European X-ray Free Electron Laser (XFEL), currently planned at DESY, at room temperature. This module is a type III, high gradient module which is also the basis of module design for the International Linear Collider (ILC). We will discuss stability within the vessel, for example, cold mass vs. He Gas Return Pipe (GRP), as well as stability along the length of the module. Results of this study may be used for the design of future XFEL/ILC module prototypes. |
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| THPMN056 | Comparison of ILC Fast Beam-Beam Feedback Performance in the e-e- and e+e- Modes of Operation | luminosity, feedback, simulation, lattice | 2832 | ||
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Several feedback loops are required in the Beam Delivery System (BDS) of the International Linear Collider (ILC) to preserve the luminosity in the presence of dynamic imperfections. Realistic simulations have been carried out to study the performance of the beam-beam deflection based fast feedback system, for both e+e- and e-e- modes of operation. The beam-beam effects in the e-e- collisions make both the luminosity and the deflections more sensitive to offsets at the IP than in the case of the e+e- collisions. This reduces the performance of the feedback system in comparison to the standard e+e- collisions, and may require a different beam parameter optimization.
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| THPMN059 | Feedback Studies | feedback, luminosity, emittance, linac | 2841 | ||
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Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area". |
Dynamic imperfections in future linear colliders can lead to a significant luminosity loss. We discuss different orbit feedback strategies in the main linac that can mitigate the emittance dilution and compare their efficiency. We also address the impact of ground motion in the beam delivery system and the potential cures. |
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| THPMN108 | Study of Adaptive Alignment as Beam Based Alignment in ILC Main Linac in the Presence of Ground Motion | emittance, linac, alignment, lattice | 2963 | ||
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Funding: U. S. Department of Energy |
The proposed International Linear Collider (ILC) machine requires extremely small transverse emittances of the beam to achieve desired luminosity. A very precise alignment of the beamline elements, both in main linac and in beam delivery system, is required to limit the emittance growth. However, ground motion (GM) and technical noise continuously misaligns the elements and hence spoils the effect of alignment. It is thus very important to understand and analyze the effect of GM on the performance of ILC. Also, it is imperative to find an effective dynamic alignment procedure to preserve the transverse emittances in the presence of GM. In this paper we study the effect of GM and technical noise on the proposed ILC main linac. Initial alignment of the Linac is performed through one-to-one and dispersion free steering (DFS). We then study "Adaptive Alignment" method to mitigate the effects of GM and technical noise. |
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| THPAN023 | MERLIN-Based Start-to-End Simulations of Luminosity Stability for the ILC | luminosity, simulation, linac, emittance | 3277 | ||
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Funding: Supported by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899. |
The International Linear Collider (ILC) requires the preservation of an ultra-small vertical emittance from the Damping Ring to the Interaction Point (IP) where the nanometre-sized beams are made to collide. It is well-known that ground motion and component vibration will need to be compensated by fast intra-train feedback systems and slower semi-continuous trajectory corrections. This complex system can in general only be modelled using simulation. In this paper, we report the progress and status of a full-featured so-called start-to-end simulation based on the MERLIN package of the ILC Low Emittance Transport (LET): Bunch compression, acceleration in the superconducting Main Linac, Beam Delivery System and finally collision at the IP. Realistic modelling of the beam-beam is included by using the code GUINEAPIG. Results based on several ground motion and vibration models and configurations of trajectory control are presented. |
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