| Paper |
Title |
Page |
| WEPCH057 |
Measurement and Optimization of the Lattice Functions in the Debuncher Ring at Fermilab
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2050 |
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- V.P. Nagaslaev, K. Gollwitzer, V.A. Lebedev, A. Valishev
Fermilab, Batavia, Illinois
- V. Sajaev
ANL, Argonne, Illinois
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A goal of the Tevatron Run-II upgrade requires substantial increase of antiproton production. The central step towards this goal is increasing the Debuncher ring admittance. Detailed understanding of the Debuncher's optics, aperture limitations and lattice functions is necessary. The method of the response matrix optimization has been used to determine quadrupole errors and corrections to the design functions. The measurement accuracy is about 5% due to the Beam Position Monitor system resolution and the small number of steering elements in the machine. We have used these accurate measurements to redesign the machine optics to maximize the acceptance of the Debuncher where the main limiting apertures are the stochastic cooling pickups and kickers. Accuracy of the measurements and the limitations are discussed as well as details of the optics modification.
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| WEPCH058 |
Progress with Collision Optics of the Fermilab Tevatron Collider
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2053 |
| |
- A. Valishev, Y. Alexahin, G. Annala, V.A. Lebedev, V.P. Nagaslaev
Fermilab, Batavia, Illinois
- V. Sajaev
ANL, Argonne, Illinois
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Recent advances in the measurement and modeling of the machine parameters and lattice functions at the Tevatron allowed modifications of the collision optics to be performed in order to increase the collider luminosity. As the result, beta functions in the two collision points were decreased from 35cm to 29cm which resulted in ~10% increase of the peak luminosity. In this report we describe the results of optics measurements and corrections. We also discuss planned improvements, including the new betatron tune working point and correction of the beta function chromaticity.
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| WEPCH059 |
Linear Lattice Modeling of the Recycler Ring at Fermilab
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2056 |
| |
- M. Xiao, V.P. Nagaslaev, A. Valishev
Fermilab, Batavia, Illinois
- V. Sajaev
ANL, Argonne, Illinois
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The Recycler Ring at Fermilab is a fixed 8 GeV kinetic energy storage ring, by the use of permanent magnets in the ring lattice. It is a strong focusing FODO lattice made up of either two gradient magnets or two quadrupoles(in dispersion free straight sections). The magnetic properties of all magnets used were measured before installation and surveyed in place to minimize possible errors. Nevertheless, substantial differences are found in tunes and beta functions between the existing linear model and the real storage ring. It results in difficulties when tuning the machine to new lattice conditions. We are trying to correct the errors by matching the model into the real machine using Orbit Response Matrix(ORM) method. The challenge with ORM particular in this ring and the results are presented in this paper.
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