| Paper |
Title |
Page |
| MPPE052 |
Study on Coupling Issues in the Recycler at Fermilab
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3209 |
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- M. Xiao, Y. Alexahin, D.E. Johnson, M.-J. Yang
Fermilab, Batavia, Illinois
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We have been working and trying to answer the following questions: where are the coupling sources in the Recycler and is the existing correcting system working fine? In this paper, we report the analysis on the sources from both modeling by code MAD based on nonlinear lattice and real machine. From the first turn flesh orbit, we fit the off-plane orbits by third order polynomial, then separate 1st, 2nd and 3rd order coefficients to see different effects. On the other hand, we present the analysis from turn by turn data, which is to verify the phase of two skew quads families are more or less orthogonal, and to make sure the minimum tune split is small enough, and is consistent with the measurement.
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| MPPE083 |
Harmonic Decomposition of Orbit Data for Multipole Analysis
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4120 |
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- M.-J. Yang
Fermilab, Batavia, Illinois
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The unprecedented position resolution provided by the newly commissioned Recycer BPM system is opening up a new chapter of beam based multipole analysis at Fermilab. The closed orbit data, taken with circulating beam and averaged over many consecutive turns, has been shown to have the resolution of a few microns. The result of polynomial fit to BPM position data, as a function of dipole kick sizes, is used to separate orbit data into first, second, and third order. Combining both the in-plane and cross-plane orbit data it is possible to determine the multipole content within each half cell. This paper presents the algorithm behind the procedure, the data collected from the Fermilab Recycler Ring, and the final analysis result.
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| MPPE084 |
Multipole error Analysis Using Local 3-Bump Orbit Data in Fermilab Recycler
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4144 |
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- M.-J. Yang, M. Xiao
Fermilab, Batavia, Illinois
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The magnetic harmonic errors of the Fermilab Recycler ring were examined using circulating beam data taken with closed local orbit bumps. Data was first parsed into harmonic orbits of first, second, and third order. Each of which was analyzed for sources of magnetic errors of corresponding order. This study was made possible only with the incredible resolution of a new BPM system that was commissioned after June of 2003.
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