Matlab-Based Loco

Portmann, G.; Safranek, J.; Huang, Xiaobiao

doi:10.2172/800082

Cited by 39 publications

(27 citation statements)

References 2 publications

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“…For ORM analysis at the KEK-ATF, we used the MATLAB version of the code LOCO developed by Safranek et al [6].…”

Section: Orbit Response Matrix Analysismentioning

confidence: 99%

Coupling Correction in the KEK-ATF Using Orbit Response Matrix Analysis

Wolski¹,

Ross²,

Woodley³

et al. 2005

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Orbit Response Matrix (ORM) analysis is a technique used to diagnose and correct optics errors in storage rings. We report the results obtained from the use of ORM analysis at the KEK-ATF to reduce the equilibrium vertical emittance. Measurements of the vertical beam size using a laser wire indicate that the vertical emittance was successfully reduced from 12 pm to around 6 pm (at a bunch charge of 7×10 9 particles) using ORM analysis.

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“…For ORM analysis at the KEK-ATF, we used the MATLAB version of the code LOCO developed by Safranek et al [6].…”

Section: Orbit Response Matrix Analysismentioning

confidence: 99%

Coupling Correction in the KEK-ATF Using Orbit Response Matrix Analysis

Wolski¹,

Ross²,

Woodley³

et al. 2005

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“…The result was that 12 skew quadrupoles (one in each sector) were sufficient, six of them located at high dispersion points and six of them at lower dispersion points with a larger product of horizontal and vertical beta-functions. In the simulations many different minimization algorithms were used, but it turned out, that orbit response matrix analysis (using Matlab LOCO [1,2]) to fit an effective skew quadrupole distribution gave results as good as the best other minimzation algorithm. Since it has the advantage of requiring very few iterations and automatially providing a measurement of the local coupling everywhere along the ring it is perfectly suited to be used with measurement data on the real machine.…”

Section: Simulation Of Emittance Correctionmentioning

confidence: 99%

Coupling correction and beam dynamics at ultralow vertical emittance in the ALS

Steiert

Robin

Wolski

2003

Proceedings of the 2003 Particle Accelerator Conference

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For synchrotron light sources and for damping rings of linear colliders it is important to be able to minimze the vertical emittance and to correct the spurious vertical dispersion. This allows one to maximize the brightness and/or the luminosity. A commonly used tool to measure the skew error distribution is the analysis of orbit response matrices using codes like LOCO. Using the new Matlab version of LOCO and 18 newly installed power supplies for individual skew quadrupoles at the ALS the emittance ratio could be reduced below 0.1% at 1.9 GeV yielding a vertical emittance of about 5 pm. At those very low emittances, additional effects like intra beam scattering become more important, potentially limiting the minimum emittance for machine like the damping rings of linear colliders.

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“…The Advanced Light Source (ALS) at LBNL has also achieved a vertical emittance of around 5 pm [3]. In this case, the coupling correction was achieved in a reasonably straightforward manner using the optics analysis code LOCO [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of KEK-ATF Optics and Coupling Using LOCO

Wolski¹

2004

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LOCO is a computer code for analysis of the linear optics in a storage ring based on the closed orbit response to steering magnets. The analysis provides information on focusing errors, BPM gain and rotation errors, and local coupling. Here, we discuss the details of the LOCO implementation at the KEK-ATF Damping Ring and report the initial results. Some of the information obtained, for example on the BPM gain and coupling errors, had not previously been determined. We discuss the possibility of using the data provided by the LOCO analysis to reduce the vertical emittance of the ATF beam. ANALYSIS OF KEK-ATF OPTICS AND COUPLING USING LOCO* AbstractLOCO is a computer code for analysis of the linear optics in a storage ring based on the closed orbit response to steering magnets. The analysis provides information on focusing errors, BPM gain and rotation errors, and local coupling. Here, we discuss the details of the LOCO implementation at the KEK-ATF Damping Ring and report the initial results. Some of the information obtained, for example on the BPM gain and coupling errors, had not previously been determined. We discuss the possibility of using the data provided by the LOCO analysis to reduce the vertical emittance of the ATF beam.

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Matlab-Based Loco

Cited by 39 publications

References 2 publications

Coupling Correction in the KEK-ATF Using Orbit Response Matrix Analysis

Coupling Correction in the KEK-ATF Using Orbit Response Matrix Analysis

Coupling correction and beam dynamics at ultralow vertical emittance in the ALS

Analysis of KEK-ATF Optics and Coupling Using LOCO

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