Effect of low frequency noise on the evolution of the emittance and halo population

For the High Luminosity upgrade the β* in IR1 and IR5 will be further reduced compared to the current LHC. As the β* decreases the β-functions in the inner triplet (IT) increase resulting in a higher sensitivity of the HL-LHC to ground motion in the IT region or to increases of the low frequency noi...

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Detalles Bibliográficos
Autores principales: Fitterer, Miriam, Albert, Markus, Antoniou, Fanouria, Bravin, Enrico, Bruce, Roderik, Fartoukh, Stephane, Fuchsberger, Kajetan, Hofle, Wolfgang, Gasior, Marek, Jaussi, Michael, Jacquet, Delphine, Kotzian, Gerd, Olexa, Jakub, Papadopoulou, Parthena Stefania, Papotti, Giulia, Papaphilippou, Yannis, Redaelli, Stefano, Salvachua Ferrando, Belen Maria, Stancari, Giulio, Trad, Georges, Valuch, Daniel, Valentino, Gianluca, Wagner, Joschka, Wenninger, Jorg
Lenguaje:eng
Publicado: 2016
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2135147
Descripción
Sumario:For the High Luminosity upgrade the β* in IR1 and IR5 will be further reduced compared to the current LHC. As the β* decreases the β-functions in the inner triplet (IT) increase resulting in a higher sensitivity of the HL-LHC to ground motion in the IT region or to increases of the low frequency noise. Noise can in general lead to emittance growth and higher halo population and diffusion rate. However, it is usually assumed in the literature that only frequencies close to the betatron frequencies and sidebands have an effect on the emittance and tail population. To test this theory, an MD was carried out to observe if also low frequency noise can lead to emittance growth and stronger halo population and diffusion.

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