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With a beam stored energy exceeding by several orders of magnitude the
quench level of the magnets and non-negligible non-linear field
components, the control of the beam dynamics and losses in LHC must be
very precise. This is a strong incentive to strengthen as much as
possible the potential of beam diagnostics. This paper reviews some of
the developments in various laboratories that appear to have a large
potential. They either allow for a much better access to classical beam
parameters or for the measurement of quantities formerly not accessible.
Examples are a fast measurement of the betatron tunes, the use of PLL for
reliable tune tracking and feedback, new methods or ideas to measure the
chromaticity with the potential of feedback systems and similarly for the
betatron coupling, the measurement of high-order non-linear fields and
resonances and the potential of AC dipole excitation. This list is bound
to be incomplete as the field is fortunately very dynamic.
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