| Paper |
Title |
Page |
| WEPLT052 |
A Method to Measure the Skew Quadrupole Strengths in the SIS-18 using Two BPMs
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1954 |
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- F. Franchi, T. Beier, M. Kirk, M. Moritz, G. Rumolo
GSI, Darmstadt
- R. Tomas
BNL, Upton, Long Island, New York
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In the SIS-18 of GSI a new set of skew quadrupoles has been installed to improve the multi-turn-injection. A new method based on the measurement of the resonance driving terms has been proposed to cross-check the nominal values and polarities of their gradients. Once a beam is transversely kicked, it experiences oscillations whose spectrum contains both the betatron tune line and secondary lines. The amplitude of each line is proportional to the strength of the multipoles, such as skew quadrupoles and sextupoles, present in the lattice. In this paper a recursive algorithm to derive the magnet strength from the spectral lines and the application of this method to the eight skew quadrupoles in the SIS-18 are presented.
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| WEPLT181 |
Measurement of Multipole Strengths from RHIC BPM Data
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2239 |
| |
- R. Tomas, M. Bai, W. Fischer
BNL, Upton, Long Island, New York
- F. Franchi, G. Rumolo
GSI, Darmstadt
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Recently resonance driving terms were successfully measured in the CERN SPS and the BNL RHIC from the Fourier spectrum of BPM data. Based on these measurements a new analysis has been derived to extract multipole strengths.In this paper we present experimental measurements of sextupolar and skew quadrupolar strengths carried out at RHIC. Also discussed is the possibility of a non-destructive measurement using an AC dipole.
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