| Paper |
Title |
Page |
| MPPP021 |
Evolution of the Machine Impedance following the ESRF Upgrade to Low-Gap NEG Coated Aluminium Chambers
|
1712 |
| |
- T.F. Günzel, L. Farvacque, T. Perron, J.-L. Revol
ESRF, Grenoble
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The installation of 5 meter-long, 8 mm vertical aperture insertion device (ID) aluminum chambers coated in house with non evaporable getter material is progressing at a rate of one chamber per shutdown. The evolution of the impedance with associated consequences on instability thresholds, following the installation of a number of low aperture insertion device chambers will be reported. In particular the impedance measurement using the local bump method allowed the identification and the replacement of the chambers of highest impedance. Correlation with the evolution of the single bunch instability thresholds and the theoretical prediction will be discussed. It could be observed that change in vertical aperture has a sensible effect on the single bunch horizontal threshold.
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| WOAC010 |
Measurement of Linear Lattice Functions in the ESRF Storage Ring Using Turn-by-Turn Data
|
698 |
| |
- Y. Papaphilippou, L. Farvacque, J.-L. Revol, V. Serriere
ESRF, Grenoble
- S.-L. Bailey
The College of William and Mary, Williamsburg
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A model-independent method to measure linear optics functions has been tested in turn-by-turn data from the ESRF storage ring. This method does not necessitate neither the knowledge of the model nor magnetic element manipulation. It uses only the positions measured in consecutive BPMs of betatron oscillations issued by small transverse kicks. The phase advances and tunes necessary to construct the transfer matrices are issued by refined Fourier analysis. The method's precision is compared with classical methods such as response matrix analysis and beam matrix construction.
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