MD1228: Validation of Single Bunch Stability Threshold & MD1751: Instability Studies with a Single Beam

Instabilities were being routinely observed in B1V during ADJUST. The timing of the instabilities has been localised to shortly after the TOTEM bump has been implemented. The result is emittance blowup which can negatively effect the luminosity output of the fill. This MD aimed to rule out possible...

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Detalles Bibliográficos
Autores principales: Carver, Lee Robert, Amorim, David, Biancacci, Nicolo, Buffat, Xavier, Iadarola, Giovanni, Lasocha, Kacper, Li, Kevin Shing Bruce, Levens, Tom, Metral, Elias, Salvant, Benoit, Tambasco, Claudia
Lenguaje:eng
Publicado: 2017
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2253233
Descripción
Sumario:Instabilities were being routinely observed in B1V during ADJUST. The timing of the instabilities has been localised to shortly after the TOTEM bump has been implemented. The result is emittance blowup which can negatively effect the luminosity output of the fill. This MD aimed to rule out possible sources of the instability (i.e. beam-beam effects or electron cloud) by only taking one single beam to 6.5TeV and going through the full machine cycle. After the implementation of the TOTEM bump, a reduction of the octupole current was performed in order to determine if there was a discrepancy in the threshold between simulations and measurement. As a precursor, the results of the End of Fill MD: Validation of Single Bunch Stability Threshold will also be described.

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