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Observation of Non-linear Effects in the Synchrotron Tune at LEP
For the purpose of energy calibration of LEP 2, the synchrotron tune was measured as a function of total accelerating voltage. Since the synchrotron tune also depends on energy loss, this method can be used to extract the beam energy with a very good precision. In the last year of LEP running, the s...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
2002
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/560943 |
Sumario: | For the purpose of energy calibration of LEP 2, the synchrotron tune was measured as a function of total accelerating voltage. Since the synchrotron tune also depends on energy loss, this method can be used to extract the beam energy with a very good precision. In the last year of LEP running, the synchrotron oscillations were excited with RF phase noise during the measurements, and a frequency shift was observed. The generic description of the oscillation does not account for large amplitudes. A higher-order approximation reveals a frequency correction to be added to the model if the oscillation enters the nonlinear regime. This paper presents the observations and compares the measurements with the extended model. |
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