| Paper | Title | Page |
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| MOPJE026 | Revision of the Impedance Model for the Interpretation of the Single Bunch Measurements at ALBA | 330 |
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Recent measurements showed that the ALBA transverse impedance model was able to explain 65% of the measured single bunch vertical detuning. * This report shows the revision of the impedance model developed to match latest single bunch measurements performed to evaluate the total effective machine impedance and impedance of specific elements, like in-vacuum undulators or a recently installed pinger magnet. The model improvement includes a better bunch length parameterisation, re-calculation of several vacuum chamber elements with Gdfidl, and inclusion of elements neglected so far in the impedance budget. We also show and discuss the computation of the resistive wall impedance using ImpedanceWake2D.
* T.Günzel, U.Iriso, F.Perez, E.Koukovini-Platia, G.Rumolo, "Analysis of the single bunch measurements at the ALBA Storage Ring", TUPRI052, proc. of IPAC14 (2014). |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE026 | |
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| MOPJE027 | Beam-based Impedance Characterization of the ALBA Pinger Magnet | 334 |
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| The ALBA pinger magnet consists on two short kickers (for horizontal and vertical planes) installed in a single Titanium coated ceramic vacuum chamber. Single bunch measurements in the vertical plane were performed in the ALBA Synchrotron Light Source before and after the pinger installation, and by comparing the Transverse Mode Coupling Instability (TMCI) thresholds for zero chromaticity, we infer the pinger impedance and compare it with the model predictions. We also perform measurements for negative chromaticities and results are reported in this paper. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE027 | |
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| MOPJE057 | Optics Measurement using the N-BPM Method for the ALBA Synchrotron | 430 |
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| The N-BPM method recently developed for the LHC has significantly improved the precision of optics measurements which are based on beam position monitor (BPM) turn-by-turn data. The main improvement is owed to the consideration of correlations for statistical and systematic error sources, as well as increasing the amount of BPM combinations for one measurement. We present how this technique can be applied at light sources like ALBA, and compare the results with other methods. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE057 | |
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| WEPMN049 | Calibration of the Acceleration Voltage of Six Normal Conducting Cavities at ALBA | 3036 |
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| ALBA is a 3Gev synchrotron light source located in Barcelona and operating with users since May 2012. The ALBA storage ring uses six room temperature cavities; each one fed by two 80kW IOTs amplifiers at 499.654 MHz. An accurate calibration of the RF voltage is required for the right adjustment of the beam synchronous phase. In addition, if the ring accommodates several RF cavities, these may not be optimally phased with respect to each other, complicating the calculation of the total RF voltage. In this paper, the steps to calibrate the accelerating voltage of the SR cavities will be presented and different methodologies to cross-check these calibrations. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN049 | |
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