Beam based alignment at LEP

We describe a beam-based method for finding the relative offset between beam position monitors (BPMs) and the magnetic centres of the adjacent quadrupole magnets. The strength of a given quadrupole is modulated and the induced closed orbit oscillation measured for different beam positions, reaching...

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Detalles Bibliográficos
Autores principales: Dehning, Bernd, Matheson, J, Mugnai, G, Reichel, I, Schmidt, R, Sonnemann, F, Tecker, F A
Lenguaje:eng
Publicado: 2003
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1016/j.nima.2003.07.039
http://cds.cern.ch/record/647867
Descripción
Sumario:We describe a beam-based method for finding the relative offset between beam position monitors (BPMs) and the magnetic centres of the adjacent quadrupole magnets. The strength of a given quadrupole is modulated and the induced closed orbit oscillation measured for different beam positions, reaching a minimum when the beam is centred in the quadrupole. The BPM reading at this point is a measure of its offset, which may be determined at LEP with an accuracy of ~40x10-6 m.

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