| Paper | Title | Other Keywords | Page |
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| TUPPC016 | Progress of Emittance Coupling Correction at the SPring-8 Storage Ring | coupling, resonance, betatron, storage-ring | 1191 |
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| The vertical beam spread, or the emittance coupling, is one of the most important parameters for the high brilliance light source storage ring. By the precise alignment of the magnets and the proper COD correction, at the commissioning phase of the SPring-8 storage ring we succeeded in achieving the very small coupling ~0.2 % without correction. However, the coupling had grown large with the years, so recently we have corrected it and recovered the initial performance. The scheme of the coupling correction at the SPring-8 storage ring is the global one, which is based on the perturbation theory with single resonance approximation. In the beginning of the correction the coupling was corrected by means of minimizing the vertical beam size. Then the performance of the coupling correction has been further improved by changing the scheme to minimizing the betatron coupling mode in the vertical oscillation of the horizontally kicked beam. This result implies that the higher order coupling contributes to the emittance coupling, which can be corrected by the higher skew multi-pole magnet. The present status of the coupling correction at the SPring-8 storage ring will be reported. | |||
| TUPPP028 | A Study of Girder Alignment with Survey Measurements In the Diamond Storage Ring | storage-ring, closed-orbit, sextupole, insertion | 1674 |
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| Using a model of the Diamond storage ring which includes displacements and rotations of the 74 magnet girders an attempt has been made to correlate survey data with the corrector magnet (CM) strengths required for a zero orbit. We then use the model to deduce the most effective girder movements that will bring about a reduction in corrector strength. We describe the results of these studies, and suggest a test with a deliberately displaced girder and the effect on corrector strengths, aimed at enhancing our understanding of the system | |||
| WEPPC088 | Standardization of CEBAF 12 GeV Upgrade Cavity Testing | cavity, HOM, radiation, LabView | 2420 |
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Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. CEBAF 12GeV upgrade project includes 80 new 7-cell cavities to form 10 cryomodules. Each cavity underwent RF qualification at 2 Kelvin using a high power accelerating gradient test and an HOM survey in JLab’s Vertical Testing Area (VTA) before cavity string assembly. In order to ensure consistently high quality data, updated cavity testing procedures and analysis were implemented and used by a group of 10 VTA operators. For high power tests, a cavity testing procedure was developed and used in conjunction with a LabVIEW program to collect the test data. Additionally while the cavity was at 2K, an HOM survey was performed using a network analyzer and a combination of Excel and Mathematica programs. Data analysis was standardized and an online logbook, Pansophy, was used for data storage and mining. The Pansophy system allowed test results to be easily summarized and searchable across all cavity tests. In this presentation, the CEBAF 12GeV upgrade cavity testing procedure, method for data analysis, and results reporting results will be discussed. |
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| WEPPP085 | Study on the Realignment Plan for J-PARC 3 GeV RCS after the Tohoku Earthquake in Japan | injection, extraction, quadrupole, alignment | 2909 |
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| J-PARC 3GeV RCS suffered the big damage to its building and cooling and electric facilities by the Tohoku Region Pacific Coast Earthquake on March 11, 2011. After the earthquake, RCS magnets were measured to confirm the state of accelerator beam line. As a result, it was found out that there was an alignment error of several millimeters in both horizontal and vertical directions that caused a deformation in the J-PARC 3GeV RCS tunnel. In this paper, we report the survey result in the accelerator tunnel after the earthquake and the realignment plan for J-PARC 3GeV RCS. | |||
| WEPPP088 | Auto-alignment System and CalibrationPprocedure in TPS Girder System | alignment, laser, storage-ring, photon | 2918 |
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| The TPS (Taiwan photon source) project is under construction and will be finished in the December 2012. Considering the floor’s deformation with time and frequent earthquakes at Taiwan, the survey and alignment procedure should be taken quite often. For dealing with these difficulties and improving accuracy of girder’s position, a highly accurate auto-tuning girders system was designed to accomplish the alignment tasks. There are two cells of TPS girders and varied sensor modulus set up for testing the auto-tuning system. The adjustment of the system converges to less than 6um, and the repeatability of the testing is under 10 um. For improving the accuracy of girders position, that is critical thing to make sure all the calibration of sensors modulus correctly and accurately. The calibration procedure about sensor modular and testing results is described in this paper. | |||
| THEPPB015 | Examples for 3D CAD Models at the European XFEL | simulation | 3266 |
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| This presentation analyses usage and benefits of 3D models in the planning and design of the European XFEL. 3D models are used in planning, design and integration activities, and they range from detailed models of individual accelerator components up to an integration model of the entire facility. Through DESY’s Engineering Data Management System, all members of the project have interactive access to all the models. Because of this general availability, the models are widely used and well-accepted as communication tools. They support vision sharing, and they help discovering and resolving design issues early (e. g. clashes). The presentation explains the modeling technique and shows (animated) examples of model usage. It also includes an animated virtual tour of the entire XFEL facility, entering at the injector complex and emerging in the experiment hall. | |||