CASA Seminar
In many applications involving intense beams, it is imperative to be able
to limit the non-equilibrium fraction of the beam that may reside far
from of the core of the distribution known as the beam halo. This aspect
of the beam propagation has been notoriously difficult to predict,
however recent progress has been made with the development of the
so-called particle-core model. Since no direct verification of this model
had been undertaken to date, we have carried out a precision experiment
to measure halo generation associated with the transport of an
intense proton beam through a linear transport channel. The LEDA RFQ was
used to inject a 6.7 MeV 10-100 mA beam into a 52-quadrupole channel.
Four matching quads at the input of this transport line were used to generate
specific mismatch oscillations and the resulting beam profiles were measured
at downstream locations over a very wide dynamic range. The results of these
experiments tend to support the particle-core model and the significance
of controlling mismatch oscillations in minimizing beam halo. However, some
anomalous behavior has been observed which has not yet been explained by
existing models. An overview of the halo generation process will be given
followed by a detailed description of the experimental results
Talk Slides:
PDF
(Coffee & Cookies before the seminar starting 9:30 AM)