Speaker
Description
The periodic resonance crossing induced by space charge in bunched beams has been studied
in many aspects. The criticality of the phenomenon appears in regimes of storage for hundreds
of synchrotron oscillations, by inducing a slow diffusion, which is very difficult to contain.
The pseudo-stochasticity of the dynamics of the periodic crossing makes the phenomenon
very difficult to frame in a theory, and full simulations are necessary to predict
emittance growth or beam loss.
A possible mitigation of this effect can be reached via resonance compensation, a process that might
be very long and that requires very detailed studies of the actual machine properties. Other approaches
are also pursued with space-charge compensation or a special magnet design.
We propose here a first investigation based on a different approach: by using a proper combination
of RF harmonics, we shape the longitudinal bunch profile so as to make the periodic crossing less
effective. The concept is explored in the CERN PS Booster in a dedicated experimental setup:
the first experimental findings are very promising and encourage this to be a new line of
investigation.
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