| Paper |
Title |
Page |
| TUPP017 |
Orbit and Dispersion Tool at FLASH
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1565 |
| |
- E. Prat, V. Balandin, N. Golubeva
DESY, Hamburg
- J. K. Kamenik, I. Kriznar, T. Kusterle
Cosylab, Ljubljana
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Based on a former MATLAB tool, a java-based application to measure and correct orbit and dispersion has been developed at FLASH. In this paper we discuss the algorithm used in this tool as well as its functionality. First tests on machine operation are also presented.
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| TUPP018 |
Impact of Electromagnetic Fields in TESLA RF Modules on Transverse Beam Dynamics
|
1568 |
| |
- E. Prat, W. Decking, M. Dohlus, T. Limberg, I. Zagorodnov
DESY, Hamburg
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Transverse electric fields in TESLA rf modules exist on one hand because of deformations of the longitudinal accelerating field in the presence of rf structure misalignments or in the vicinity of asymmetrically machine parts like input couplers. On the other hand, the beam itself induces transverse wake fields if it does not travel through the center of a perfectly rotationally symmetric structure. Transverse deflecting fields deflect beam particles. The average deflection causes a change in the beam trajectory; the phase dependence of the transverse field leads to a variation of the transverse kick along the longitudinal position of the bunch and thus in general to a change in projected emittance. If the strength of the transverse field component varies along the transverse direction itself, slice emittance will be also affected. We will present the amplitudes and spatial variations of transverse fields generated by the mechanisms described above, and discuss their impact on beam trajectories and shape.
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