| Paper |
Title |
Page |
| WEPLS084 |
AC Field Measurements of Fermilab Booster Correctors Using a Rotating Coil System
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2574 |
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- G. Velev, J. DiMarco, D.J. Harding, V.S. Kashikhin, M.J. Lamm, A. Makulski, D.F. Orris, P. Schlabach, C. Sylvester, M. Tartaglia, J. Tompkins
Fermilab, Batavia, Illinois
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The first prototype of a new corrector package for the Fermilab Booster Synchrotron is presently in production. This water-cooled package includes normal and skew dipole, quadrupole and sextupole magnets to control orbit, tune and chromaticity of the beam over the full range of Booster energies (400 MeV-8 GeV). These correctors must make rapid excursions from the 15 Hz excitation cycle of the main synchrotron magnets, in some cases even switching polarity in approximately 1 ms at transition crossing. To measure the dynamic changes in the field during operation, a new method based on a relatively slow rotating coil system is proposed. The method pieces together the measured flux from successive current cycles to reconstruct the field harmonics. This paper describes the method and presents initial field quality measurements from the corrector prototype.
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| WEPLS110 |
New Measurements of Sextupole Field Decay and Snapback Effect on Tevatron Dipole Magnets
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2640 |
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- G. Velev, P. Bauer, R.H. Carcagno, J. DiMarco, M.J. Lamm, D.F. Orris, P. Schlabach, C. Sylvester, M. Tartaglia, J. Tompkins
Fermilab, Batavia, Illinois
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To perform detailed studies of the dynamic effects in superconducting accelerator magnets, a fast continuous harmonics measurement system based on the application of a digital signal processor (DSP) has been built at Fermilab. Using this new system the dynamic effects in the sextupole field, such as the field decay during the dwell at injection and the rapid subsequent "snapback" during the first few seconds of the energy ramp, are evaluated for more than ten Tevatron dipoles from the spares pool. The results confirm the previously observed fast drift in the first several seconds of the sextupole decay and provided additional information on a scaling law for predicting snapback duration. The presented information can be used for an optimization of the Tevatron and for future LHC operations.
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