Conference Paper

A Betatron Tune Fitting Package for the Tevatron 21.4 MHz Schottky

Fermilab, Batavia, IL 60510, U.S.A. Ezio Todesco, CERN, Geneva, Switzerland,
DOI: 10.1109/PAC.2005.1590617 Conference: Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Source: IEEE Xplore

ABSTRACT The Fermilab Tevatron is equipped with two independent Schottky monitors for measurement of betatron tunes, one operating at 21.4 MHz and the other at 1.7 GHz. A new front-end and related data acquisition for the 21.4 MHz resonator has been installed and commissioned during the FY04 Collider RunII. Sophisticated fitting strategies are required to analyze the spectra. Optimization of this fitting package allows us to report tune and chromaticity measurements at almost 1 Hz.

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    ABSTRACT: Early in Run2, there was an effort to compare the different emittance measurements in the Tevatron (flying wires and synchtotron light) and understand the origin of the observed differences. To measure the beta function at a few key locations near the instruments, air-core quadrupoles were installed. By modulating the gradient of these magnets and measuring the effect on the tune, the lattice parameters can be extracted. Initially, the results seem to disagree with with other methods. At the time, the lattice was strongly coupled due to a skew component in the main dipoles, caused by sagging of the cryostat. After a large fraction of the superconducting magnets were shimmed to remove a strong skew quadrupole component, the results now agree with the theoretical values to within 20%.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005

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