No significant changes in the distribution of the modes are to be noted compared to the 2004 period (Figure 163). The multi-bunch modes with the largest current and the longest lifetime remain dominant, making up 76 % of the shifts. Following the regular installation of additional small aperture ID chambers, the single bunch mode (15 mA) was replaced in 2004 by the 4-bunch mode (4*10 mA), which generate a higher average current while avoiding the difficult machine tuning required to raise the single bunch current beyond 10 mA in a stable and repeatable manner. In 2005, we observed a stabilisation of the effect and no difficulties are anticipated for the delivery of the timing modes with similar performance in 2006.

Fig. 163: Distribution of the various filling modes used in 2005.