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WE2T1 |
Beam Stability Requirements for Ultra-Low Emittance Circular Light Sources | |
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| For many light sources undergoing upgrades to 4th generation facilities, the breadth and importance of beam stability has grown substantially i.e. tighter stability requirements over greater bandwidths over various timescales. Diagnostics groups now require significant knowledge of beam stability requirements, sources of disturbances (ground motion, thermal expansion, water cooling, power supplies), their measurement (accelerometers, FEA, experimental modal analysis, transfer functions) and mitigation (passive damping, feedback or stabilisation techniques/reference monitoring like hydrostatic levelling or length encoders on reference columns etc). A more holistic approach of beam stability is becoming more common, considering electron BPMs, front-end XBPMs and beamline XBPMs together and enabling synchronised review of stability data from fast archivers. | ||
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Slides WE2T1 [4.017 MB] | |
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| WE2C2 | Beam Stability in the MAX IV 3 GeV Storage Ring | 370 |
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| The MAX IV Laboratory, inaugurated in 2016, hosts a 3 GeV ultra-low emittance storage ring, a 1.5 GeV storage ring and a linear accelerator driven Short Pulse Facility to deliver synchrotron radiation to scientific users. A Stability Task Force has been assigned to ensure the delivery of stable beams since early on in the design phase of the laboratory and is continuing its work in an ongoing and multi-disciplinary effort. Measurements of the electron beam stability resulting from the passive stabilization approach taken for the two storage rings will be presented, as well as figures of beam stability with the Fast Orbit Feedback system in operation. Each ID beamline in the 3 GeV storage ring is equipped with a pair photon beam position monitors that are currently used to complement the electron beam position monitors. In the light of the city development around the MAX IV campus, maintaining the good mechanical stability of the laboratory has to be seen as an ongoing effort. A number of studies are being performed to identify possible risks and to decide where measures need to be taken. | ||
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Slides WE2C2 [1.905 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE2C2 | |
| About • | Received ※ 12 September 2022 — Accepted ※ 15 September 2022 — Issue date ※ 12 October 2022 | |
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| WE2I3 | Adaptive Feedforward Control of Closed Orbit Distortion Caused by Fast Helicity-Switching Undulators | 374 |
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We developed a new correction algorithm for closed orbit distortion (COD) based on adaptive feedforward control (AFC). The AFC system effectively works for the suppression of the fast COD due to known error sources with repetitive patterns such as helicity-switching undulators. The scheme aims to counteract error sources by feedforward correctors at the position or in the vicinity of error sources so that a potential risk of unwanted local orbit bumps, which is known to exist for the global orbit feedback, can be eliminated in a reliable and accurate manner. This option is especially advantageous when an error source causes an angular distortion of photon beams such as a fast orbit distortion near undulators. Thus, the AFC provides a complementary capability to a so-called fast global orbit feedback (FOFB) for coming next-generation light sources where ultimate light source stability is essentially demanded. In this talk, introduction to the AFC, its theoretical aspect and advantages, the system overview, the experimental results for the effects of AFC will be presented.
M. Masaki, et al., J. Synchrotron Rad. 28, 1758-1768 (2021). |
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Slides WE2I3 [2.998 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE2I3 | |
| About • | Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 09 October 2022 | |
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| WE2C4 | RF System-on-Chip for Multi-Bunch and Filling-Pattern Feedbacks | 379 |
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| RF Systems-on-Chip (RFSoCs) are FPGAs with CPUs, multi-GSample/s ADCs and DACs and other components on the same chip. We have evaluated the use of RFSoCs for low-latency multibunch (bunch-by-bunch) feedback and filling pattern (single bunch charge) measurement systems for the Swiss Light Source (SLS) storage ring. First results obtained with an RFSoC evaluation board will be presented. | ||
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Slides WE2C4 [1.804 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE2C4 | |
| About • | Received ※ 10 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 29 October 2022 | |
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