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Old thread, but just to answer... not very hard, but currently 25 ns bunch spacing causes electron cloud effects that cause excessive beam losses. The experiments would very much prefer 25 ns. They want as much luminosity (which causes collisions) as possible, but spread out enough that it's not har...

If the actual source were a higher frequency, then a smaller relative frequency shift would, after subtracting multiples of the 11.2 kHz sampling frequency, produce the fairly large frequency instabilities that are noted. Since the frequency is observed at 0.28±0.05 times 11.2 kHz, it could really b...