Operation of LHC with bunch trains at different spacings has revealed the formation of an electron cloud inside the machine. The main observations of electron cloud build up are the pressure rise measured at the vacuum gauges in the warm regions, as well as the increase of the beam screen temperature in the cold regions due to an additional heat load. The effects of the electron cloud were also visible as instability and emittance growth affecting the last bunches of longer trains, which could be improved running with higher chromaticity or larger transverse emittances. A summary of the 2010 and 2011 observations and measurements and a comparison with models will be presented. The efficiency of scrubbing to improve the machine running performance will be briefly discussed.
Electron cloud observation in LHC / G., Rumolo; G., Arduini; V., Baglin; H., Bartosik; Biancacci, Nicolò; P., Baudrenghien; G., Bregliozzi; P., Chiggiato; S., Claudet; R., De Maria; J., Esteban Muller; M., Favier; C., Hansen; W., Hofle; J. M., Jimenez; V., Kain; G., Lanza; K., Li; H., Maury Cuna; E., Metral; G., Papotti; T., Pieloni; F., Roncarolo; B., Salvant; E., Shaposhnikova; R., Steinhagen; L., Tavian; D., Valuch; W., Venturini Delsolaro; F., Zimmermann; U., Iriso; O., Domınguez; E., Koukovini Platia; N., Mounet; C., Zannini; C., Bhat. - (2011), pp. 2862-2864. (Intervento presentato al convegno IPAC11 tenutosi a San Sebastian (Spain) nel 4-9/09/2011).
Electron cloud observation in LHC
BIANCACCI, NICOLÒ;
2011
Abstract
Operation of LHC with bunch trains at different spacings has revealed the formation of an electron cloud inside the machine. The main observations of electron cloud build up are the pressure rise measured at the vacuum gauges in the warm regions, as well as the increase of the beam screen temperature in the cold regions due to an additional heat load. The effects of the electron cloud were also visible as instability and emittance growth affecting the last bunches of longer trains, which could be improved running with higher chromaticity or larger transverse emittances. A summary of the 2010 and 2011 observations and measurements and a comparison with models will be presented. The efficiency of scrubbing to improve the machine running performance will be briefly discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.