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| MOP16 | Time Resolved Dynamics of Transverse Resonance Island Buckets at SPEAR3 | experiment, timing, resonance, lattice | 62 |
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| The Transverse Resonance Island Buckets have been studied at SPEAR3 as an option for timing experiment mode operation of this third generation synchrotron radiation facility. In this mode, with proper optics setting, the electron beam is populated to island orbits with the excitation from a kicker. In this paper, we will report the experimental observation of the beam dynamics with turn by turn beam position monitors and a fast gated camera. The results are also compared with tracking simulations. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP16 | ||
| About • | Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 22 September 2022 | ||
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| TU2C2 | The Diamond Beam Loss Monitoring System at CERN LHC and SPS | detector, injection, extraction, instrumentation | 202 |
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| The Large Hadron Collider (LHC) and the Super Proton Synchrotron (SPS) accelerators are equipped with 17 pCVD diamond based Beam Loss detectors at strategical locations where their nanosecond resolution can provide insights into the loss mechanisms and complement the information of the standard ionization chamber type detectors. They are used at the injection and extraction lines of the LHC and SPS, to analyse the injection or extraction efficiency, and to verify the timing alignment of other elements like kicker magnets. They are used at the betatron collimation region and are being also explored as detectors to analyse slow extractions. The acquisition chain was fully renovated during the second LHC long shutdown period (from December 2018 to July 2022) to provide higher resolution measurements, real-time data processing and data reduction at the source as well as to integrate seamlessly to the controls infrastructure. This paper presents the new hardware platform, the different acquisition modes implemented, the system capabilities and initial results obtained during the commissioning and operation at the beginning of the LHC’s Run 3. | |||
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Slides TU2C2 [4.414 MB] | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TU2C2 | ||
| About • | Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 14 September 2022 | ||
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| WE2I3 | Adaptive Feedforward Control of Closed Orbit Distortion Caused by Fast Helicity-Switching Undulators | undulator, controls, experiment, storage-ring | 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 | feedback, hardware, storage-ring, controls | 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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| WEP36 | Conceptual Design of the Transverse Multi-Bunch Feedback for the Synchrotron Radiation Source PETRA IV | feedback, damping, detector, synchrotron | 488 |
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| PETRA IV will be a new, fourth-generation, high-brilliance synchrotron radiation source in the hard X-ray range. To keep the emittance low at high beam current an active feedback system to damp transverse multi-bunch instabilities is required. The particular challenge to the system is the very low-noise, while maintaining high bandwidth, which is defined by the 2 ns bunch spacing. In this paper, we present the conceptual design of the transverse multi-bunch feedback (T-MBFB) system and technical challenges to fulfill the performance require-ments. An overview is given on the hardware and the method for detecting and damping the coupled-bunch oscillations. Using modern high-speed ADCs enables direct sampling of pulses from beam pick-ups, which removes the necessity for down-converters. Powerful digital signal processing allows not only for the effective feedback implementation, but also for developing versa-tile tools for the machine diagnostics. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP36 | ||
| About • | Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 December 2022 — Issue date ※ 12 December 2022 | ||
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