| Paper |
Title |
Page |
| WEPA70 |
Tensor Decomposition for the Compression and Analysis of 10 kHz BPM Data |
792 |
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- J. Choi, Y. Hidaka, Y. Hu, G.M. Wang
BNL, Upton, New York, USA
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Funding: This work is supported in part by the U.S. Department of Energy (DOE) under contract No. DE-SC0012704.
In the NSLS-II storage ring during user operation, fast-acquisition (FA) 10-kHz BPM data are collected, and their spectral properties are analyzed. Various periodograms and spectral peaks are being provided every minute, and they are very useful in identifying any changes in the orbit. Unfortunately, because of the large amount of data, only several numbers are being continually archived for later study, and the full raw data are saved only by hand when needed. We are developing methods utilizing tensor decomposition techniques to save and analyze the FA data; this paper reports the current status of this project.
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-NAPAC2022-WEPA70
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| About • |
Received ※ 02 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 10 August 2022 — Issue date ※ 28 September 2022 |
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| WEPA71 |
Unified Orbit Feedback at NSLS-II |
795 |
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- Y. Hidaka, Y. Li, R.M. Smith, Y. Tian, G.M. Wang, X. Yang
BNL, Upton, New York, USA
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Funding: This work is supported by U.S. DOE under Contract No. DE-SC0012704.
We have developed an orbit correction / feedback program to unify the existing orbit-related feedback systems for stable beam operation at NSLS-II. Until recently only a handful of beamlines have been benefiting from long-term orbit stability provided by a local bump agent program. To expand this to all the beamlines as well as correct more frequently, a new slow orbit feedback program called unified orbit feedback (UOFB) was written from scratch that works with the fast orbit feedback transparently, while accumulated fast corrector strength is continuously shifted to the slow correctors and RF frequency is adjusted for circumference change. UOFB can lock 3 different types of local bumps to the target offsets/angles for days: those for insertion device (ID) sources with only ID RF beam position monitors (BPM) or mixtures of ID RF BPMs and X-ray BPMs, and those for bending magnet sources with arc BPMs between which orbit correctors, dipoles and quadrupoles exist. Furthermore, this feed-back can accommodate beamline user requests to enable / disable the feedback loop for their beamline and to change bump target setpoints without turning off the loop.
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Poster WEPA71 [2.541 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-NAPAC2022-WEPA71
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| About • |
Received ※ 02 August 2022 — Revised ※ 09 August 2022 — Accepted ※ 12 August 2022 — Issue date ※ 31 August 2022 |
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| WEPA80 |
Progress on Convergence Map Based on Square Matrix for Nonlinear Lattice Optimization |
823 |
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- L.H. Yu, Y. Hao, Y. Hidaka, F. Plassard, V.V. Smaluk
BNL, Upton, New York, USA
- Y. Hao
FRIB, East Lansing, Michigan, USA
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Funding: DOE.
We report progress on applying the square matrix method to obtain in high speed a "convergence map", which is similar but different from a frequency map. We give an example of applying the method to optimize a nonlinear lattice for the NSLS-II upgrade. The convergence map is obtained by solving the nonlinear dynamical equation by iteration of the perturbation method and studying the convergence. The map provides information about the stability border of the dynamical aperture. We compare the map with the frequency map from tracking. The result in our example of nonlinear optimization of the NSLS-II lattice shows the new method may be applied in nonlinear lattice optimization, taking advantage of the high speed (about 30~300 times faster) to explore x, y, and the off-momentum phase space.
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Poster WEPA80 [5.392 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-NAPAC2022-WEPA80
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| About • |
Received ※ 19 July 2022 — Revised ※ 26 July 2022 — Accepted ※ 08 August 2022 — Issue date ※ 10 August 2022 |
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| WEPA81 |
Time-Resolved Experiments at NSLS II: Motivation and Machine Capabilities |
826 |
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- G.M. Wang, B. Bacha, G. Bassi, G.L. Carr, Y. Hidaka, Y. Hu, Y. Li, C. Mazzoli, D. Padrazo Jr, R.S. Rainer, J. Rose, J.T. Sadowski, V.V. Smaluk, Y. Tian, L. Wiegart, G. Williams, X. Yang
BNL, Upton, New York, USA
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NSLS-II is a 3-GeV third-generation synchrotron light source at Brookhaven National Lab. The storage ring has been in routine operations for over six years and hosts 28 operating beamlines. The storage ring performance has continuously improved, including 500-mA with limited insertion devices closed, and routine 400-mA top off operation with 90% uniform filling pattern. Recently, we are exploring different operation modes, uniform multi single-bunch mode, and camshaft mode with a high single-bunch charge, to support timing-resolved user experiments. In this paper, we explore the potential for scientific experiments using the pulsed nature of the NSLS, summarize the user requirements on the beam parameters and the progress of accelerator studies.
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-NAPAC2022-WEPA81
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| About • |
Received ※ 04 August 2022 — Revised ※ 12 August 2022 — Accepted ※ 13 August 2022 — Issue date ※ 22 August 2022 |
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