Here some more enlightening remarks from that shift and the next one:
- central hump frequency seems to move much faster inside the spectrum since we increased the bunch intensity...
- (an hour later:) B1 lifetime with 9e10 is about 30h. Lots of hump in the tune spectrum
- (a few hours later:) we could inject nice and tiny beams with regulating all parameters and thanks to the absence of the hump
Anyway: we just learnt that the hump can "just" vanish, and that it appears to depend on the intensity of the beam.
Intruiging, isn't it?