| Paper | Title | Page |
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| TUZBB2 | Reaching Low Emittance in Synchrotron Light Sources by Using Complex Bends | 352 |
| TUPLM30 | use link to see paper's listing under its alternate paper code | |
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All modern projects of low-emittance synchrotrons follow Multi-Bend Achromat approach*. The low emittance is realized by arranging small horizontal beta-function and dispersion in the bending magnets, the number of which varies from 4 to 9 magnets per cell. We propose an alternative way to reach low emittance by use of a lattice element that we call "Complex Bend"**, instead of regular dipole magnets. The Complex Bend is a new concept of bending magnet consisting of a number of dipole poles interleaved with strong alternate focusing so as to maintain the beta-function and dispersion oscillating at very low values. The details of Complex Bend, considerations regarding the choice of optimal parameters, thoughts for its practical realization and use in low-emittance lattices, are discussed.
* MBA: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.495.2446&rep=rep1&type=pdf ** Complex Bend: Phys. Rev. Accel. Beams 21, 100703 (2018) |
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Slides TUZBB2 [7.894 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-TUZBB2 | |
| About • | paper received ※ 01 September 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019 | |
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| TUPLM36 | Temperature Measurements of the NSLS-II Vacuum Components | 443 |
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| This paper is dedicated to the analysis of our recent experience from ramp-up of operating current at NSLS-II from 25 mA at the end of commissioning in 2014 to 475 mA achieved in studies today. To approach the design level of the ring intensity we had to solve major problems in overheating of the chamber components. Since the beginning of the NSLS-II commissioning, the temperature of the vacuum components has been monitored by the Resistance Temperature Detectors located predominantly outside of the vacuum chamber and attached to the chamber body. A couple of vacuum components were designed with the possibility for internal temperature measurements under the vacuum as diagnostic assemblies. Temperature map helps us to control overheating of the vacuum components around the ring especially during the current ramp-up. The average current of 475mA has been achieved with two main 500MHz RF cavities and w/o any harmonic cavities. In this paper we discuss the heating results for a 15ps bunch length (at low current) of the following vacuum components: Large Aperture BPM, Small Aperture BPM, Bellows, Flanges, Ceramics Chambers and Stripline Kickers. | ||
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Poster TUPLM36 [3.696 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-TUPLM36 | |
| About • | paper received ※ 28 August 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019 | |
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| WEPLM05 | Continuous Monitoring of Spectral Features of Electron Beam Orbit Motion at NSLS-II | 673 |
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| NSLS-II ring is equipped with state-of-the art beam position monitors (BPMs) which are indispensable in all aspects of machine studies and operations. Among other data, they can provide, on demand, up to 10 seconds of fast-acquisition (FA) data, sampled at ~10 kHz. Analysis of these data in time, frequency and spatial domains provides valuable insights into orbit stability, locations of residual noise sources, performance of feedback systems, etc. In addition, changes in FA signal spectral features are often the earliest indicators of potential equipment problems. This is why we recently implemented an Input / Output Controller (IOC) software that runs during regular user operation, and, once a minute, acquires 10 second buffers of FA data from 180 BPMs around the ring. These buffers are processed to determine the amplitudes and frequencies of the strongest spectral peaks as well as some other measures of fast beam orbit noise. Processed results can be monitored in real time and are also archived for offline analysis and troubleshooting. In this paper we discuss the implementation of this system and the insights we gained from it over about two years of operations. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM05 | |
| About • | paper received ※ 31 August 2019 paper accepted ※ 02 September 2019 issue date ※ 08 October 2019 | |
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| THYBA5 | Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab | 934 |
| SUPLH03 | use link to see paper's listing under its alternate paper code | |
| TUPLH13 | use link to see paper's listing under its alternate paper code | |
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| We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab, with an InGaAs PIN photodiode and an integrating circuit. In this paper, we present a theoretical model for the experimental data from previous similar experiments and in our present experiment, we attempt to verify the model in an independent and a more systematic way. Moreover, in our experiment we consider the regime of very small fluctuation when the contribution from the photon shot noise is significant, whereas we believe it was negligible in the previous experiments. Accordingly, we present certain critical improvements in the experimental setup that let us measure such a small fluctuation. | ||
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Slides THYBA5 [8.048 MB] | |
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Poster THYBA5 [3.079 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-THYBA5 | |
| About • | paper received ※ 24 August 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |