| Paper | Title | Page |
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| THPAN025 | Evaluation of the Component Tolerances for the ILC Main Linac Assuming Global Linear Corrections | 3280 |
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Funding: This work is supported by the Commission of the European Communities under the 6th Framework Programme 'Structuring the European Research Area', contract number RIDS-011899. The small energy-spread, weak wakefields and relatively weak focusing in the ILC superconducting Main Linac result in little or no filamentation beam mismatch errors: linear correlations such as dispersion or cross-plane coupling from transverse misalignment or rotation errors of the quadrupoles respectively do not decohere as the beam is transported (accelerated) along the linac. Using correction available in the Beam Delivery System, the increase in projected emittance due to this linear correlations can to a large degree be corrected. In this paper we present component tolerances based on the assumption of a global correction at the end of the Main Linac. Some discussion on the impact of ground motion is also discussed. |
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| THPMS013 | Comparison of Tracking Codes for the International Linear Collider | 3020 |
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Funding: Supported by the US Department of Energy, the US National Science Foundation and the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area". In an effort to compare beam dynamics and create a ‘‘benchmark'' for Dispersion Free Steering (DFS) a comparison was made between different International Linear Collider (ILC) simulation programs while performing DFS. This study consisted of three parts. First, a simple betatron oscillation was tracked through each code. Secondly, a set of component misalignments and corrector settings generated from one program was read into the other to confirm similar emittance dilution. Thirdly, given the same set of component misalignments DFS was performed independently in each program and the resulting emittance dilution was compared. Performance was found to agree exceptionally well in all three studies. |
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| THPAN023 | MERLIN-Based Start-to-End Simulations of Luminosity Stability for the ILC | 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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| FRPMN094 | Beam Profile Measurements with the 2-D Laser-Wire at PETRA | 4303 |
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Funding: Work supported by the PPARC LC-ABD collaboration and the Commission of the European Communities under the 6th Framework Programme Structuring the European Research Area, contract number RIDS-011899. The current PETRA II Laser-Wire system, being developed for the ILC and PETRA III, uses a piezo-driven mirror to scan laser light across an electron bunch. This paper reports on the recently installed electron-beam finding system, presenting recent horizontal and vertical profile scans with corresponding studies. |