Large Piwinski angle

Two high brightness bunches per beam were collided at injection energy with varying spectrometer strength in IP8 so that the corresponding Piwinski angle changed from about 1.2–1.3 to 0.2. One of the two bunches colliding in IP8 also collided in IPs 1 and 5, increasing its tune spread. A Piwinski an...

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Detalles Bibliográficos
Autores principales: Abelleira, J L, Buffat, X, Bhat, C, Cornelis, K, De Maria, R, Fartoukh, S, Giachino, R, Holzer, E B, Lamont, M, Mastoridis, T, Macpherson, A, Papotti, G, Pieloni, T, Roncarolo, F, Roy, G, Salvachua, B, Valuch, D, Zimmermann, F, Ohmi, K
Lenguaje:eng
Publicado: 2012
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1493062
Descripción
Sumario:Two high brightness bunches per beam were collided at injection energy with varying spectrometer strength in IP8 so that the corresponding Piwinski angle changed from about 1.2–1.3 to 0.2. One of the two bunches colliding in IP8 also collided in IPs 1 and 5, increasing its tune spread. A Piwinski angle of 1.2 is the biggest value ever achieved in a hadron collider. The goal of this experiemnt had been to investigate the influence of this parameter on the luminosity lifetime, beam lifetime and emittance growth rate. Due to technical problems and unavailability of luminosity signals from CMS this goal was only partially accomplished.

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