Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors

doi:10.1103/PhysRevAccelBeams.20.054001

Title: Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors

Full Record
Other Related Research

Abstract

A novel technique has been developed to improve the precision and shorten the measurement time of the LOCO (linear optics from closed orbits) method. This technique, named AC LOCO, is based on sine-wave (ac) beam excitation via fast correctors. Such fast correctors are typically installed at synchrotron light sources for the fast orbit feedback. The beam oscillations are measured by beam position monitors. The narrow band used for the beam excitation and measurement not only allows us to suppress effectively the beam position noise but also opens the opportunity for simultaneously exciting multiple correctors at different frequencies (multifrequency mode). We demonstrated at NSLS-II that AC LOCO provides better lattice corrections and works much faster than the traditional LOCO method.

Authors:: Yang, X.; Smaluk, V.; Yu, L. H.; Tian, Y.; Ha, K.

Publication Date:: 2017-05-02

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI Identifier:: 1355069

Alternate Identifier(s):: OSTI ID: 1413915

Report Number(s):: BNL-114344-2017-JA
Journal ID: ISSN 2469-9888; PRABCJ; 054001

Grant/Contract Number:: AC02-98CH10886; SC0012704

Resource Type:: Published Article

Journal Name:: Physical Review Accelerators and Beams

Additional Journal Information:: Journal Name: Physical Review Accelerators and Beams Journal Volume: 20 Journal Issue: 5; Journal ID: ISSN 2469-9888

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; NSLS-II; LOCO; linear optics; closed orbits; National Synchrotron Light Source II

Citation Formats


                    Yang, X., Smaluk, V., Yu, L. H., Tian, Y., and Ha, K. Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors.  United States: N. p., 2017. 
        Web.  doi:10.1103/PhysRevAccelBeams.20.054001.

Copy to clipboard


                    Yang, X., Smaluk, V., Yu, L. H., Tian, Y., & Ha, K. Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors.  United States.  doi:10.1103/PhysRevAccelBeams.20.054001.

Copy to clipboard


                    Yang, X., Smaluk, V., Yu, L. H., Tian, Y., and Ha, K. Tue .  
        "Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors".  United States.  doi:10.1103/PhysRevAccelBeams.20.054001.

Copy to clipboard


                    
@article{osti_1355069,

  title        = {Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors},

  author       = {Yang, X. and Smaluk, V. and Yu, L. H. and Tian, Y. and Ha, K.},

  abstractNote = {A novel technique has been developed to improve the precision and shorten the measurement time of the LOCO (linear optics from closed orbits) method. This technique, named AC LOCO, is based on sine-wave (ac) beam excitation via fast correctors. Such fast correctors are typically installed at synchrotron light sources for the fast orbit feedback. The beam oscillations are measured by beam position monitors. The narrow band used for the beam excitation and measurement not only allows us to suppress effectively the beam position noise but also opens the opportunity for simultaneously exciting multiple correctors at different frequencies (multifrequency mode). We demonstrated at NSLS-II that AC LOCO provides better lattice corrections and works much faster than the traditional LOCO method.},

  doi          = {10.1103/PhysRevAccelBeams.20.054001},

  journal      = {Physical Review Accelerators and Beams},

  number       = 5,

  volume       = 20,

  place        = {United States},

  year         = {2017},

  month        = {5}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.20.054001

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 1 work

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

AC orbit bump method of local impedance measurement

Journal Article Smaluk, Victor ; Yang, Xi ; Blednykh, Alexei ; ... - Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

A fast and precise technique of local impedance measurement has been developed and tested at NSLS-II. This technique is based on in-phase sine-wave (AC) excitation of four fast correctors adjacent to the vacuum chamber section, impedance of which is measured. The beam position is measured using synchronous detection. Use of the narrow-band sine-wave signal allows us to improve significantly the accuracy of the orbit bump method. Beam excitation by fast correctors results in elimination of the systematic error caused by hysteresis effect. The systematic error caused by orbit drift is also eliminated because the measured signal is not affected bymore »« less
Cited by 1
DOI: 10.1016/j.nima.2017.07.067

Full Text Available
First demonstration of the fast-to-slow corrector current shift in the NSLS-II storage ring

Journal Article Yang, Xi ; Tian, Yuke ; Yu, Li Hua ; ... - Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

In order to realize the full benefits of the high brightness and ultra-small beam sizes of NSLS-II, it is essential that the photon beams are exceedingly stable. In the circumstances of implementing local bumps, changing ID gaps, and long term drifting, the fast orbit feedback (FOFB) requires shifting the fast corrector strengths to the slow correctors to prevent the fast corrector saturation and to make the beam orbit stable in the sub-micron level. As the result, a reliable and precise technique of fast-to-slow corrector strength shift has been developed and tested at NSLS-II. This technique is based on the fastmore »« less
DOI: 10.1016/j.nima.2018.01.006

Full Text Available
Experimentally demonstrating the current shifting between fast and slow correctors in NSLS-II SR when the FOFB is on

Technical Report Tian, Yuke ; Yang, Xi ; Yu, Li Hua ; ...

In the following, we describe a method of shifting strengths of fast correctors to slow correctors, while the fast orbit feedback (FOFB) is turned on. This method has been developed to prevent saturation of the fast correctors, which results in degradation of the FOFB performance. At NSLS-II, we experimentally demonstrated a successful fast-to-slow corrector strength transfer. The maximal fast corrector current has been reduced from greater than 0.45 A to less than 0.04 A. At the same time, the beam orbit was stabilized within ±1 μm level, which is acceptable by the operational standard. Now, the method is ready formore » release to the routine operations.« less
DOI: 10.2172/1504891

Full Text Available
Integrated Global Orbit Feedback with Slow and Fast Correctors

Conference Pinayev, I

The NSLS-II Light Source, which is planned to be built at Brookhaven National Laboratory, provides users with ultra-bright synchrotron radiation sources and is designed for horizontal beam emittances < 1 nm. Full utilization of the very small emittances and beam sizes requires sub-micron orbit stability in the storage ring. This can be provided by means of a wide bandwidth orbit feedback system. Traditional approach is to utilize a uniform set of fast correctors or use two separate systems with strong slow and weaker fast correctors. In the latter case two systems needed to communicate to suppress transients associated with differentmore »« less
Full Text Available
NSLS-II Storage Ring BPM Calibration via LOCO

Technical Report Yang, Xi

In the following, we describe a method of the beam based calibration of the beam position monitor (BPM) system in the NSLS-II storage ring (SR) via the LOCO (Linear Optics from Closed Orbits) technique. This method measures the orbit response matrix (ORM) and the dispersion function of the machine. The data are then fitted to a lattice model by adjusting parameters such as quadrupole and skew quadrupole strengths in the model, BPM gains and rolls, corrector gains and rolls of the measurement system. Therefore, BPM gains and rolls are obtained.
DOI: 10.2172/1504718

Full Text Available

Similar Records