MD3308 – Growth rate versus chromaticity measurement at injection

This report summarises the results of MD3308 on the measurement of the instability rise time as a function of chromaticity in the LHC. The measurement was held in the MD block 3 of 2018, on the afternoon of the 14th of September. With nominal bunches at the injection energy, the horizontal and verti...

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Detalles Bibliográficos
Autores principales: Amorim, David, Antipov, Sergey, Buffat, Xavier, Carideo, Emanuela, Dascalu, Titus-Stefan, Metral, Elias, Mounet, Nicolas, Oeftiger, Adrian, Salvant, Benoit, Valuch, Daniel
Lenguaje:eng
Publicado: 2020
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2720706
Descripción
Sumario:This report summarises the results of MD3308 on the measurement of the instability rise time as a function of chromaticity in the LHC. The measurement was held in the MD block 3 of 2018, on the afternoon of the 14th of September. With nominal bunches at the injection energy, the horizontal and vertical chromaticities were trimmed in the negative range from ∼-40 to -2 units. The transverse damper (ADT) was switched off to let an instability develop. The turn-by-turn position signal was then recorded with the ADT ObsBox. From these signals, the rise-time was deduced and compared to a prediction derived from the LHC impedance model.

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