| Paper |
Title |
Page |
| PT10 |
Emittance and dispersion measurements at TTF
|
180 |
| |
- M. Castellano, A. Cianchi, V.A. Verzilov
INFN-LNF, Laboratori Nazionali di Frascati dell'INFN, Frascati, Italy
|
|
| |
It is well known that beam dispersion , along with the
Twiss parameters and emittance, contributes to the beam
spot size. So that, in general, anomalous dispersion is an
undesirable event and must be minimized by careful tuning
the machine. If not, when the spot size is used to infer
beam emittances, as it is the case of the "quadrupole
scan" method, basically employed at TTF, the unknown
dispersion can lead to overestimated values for the emittance.
This paper presents the first attempt to determine the
dispersion function at several points of the TTF Linac and
to separate its contribution to the local emittance measurement,
performed by means of the OTR imaging technique.
|
|
| PT17 |
Role of pre-wave zone effects in TR-based beam diagnostics
|
199 |
| |
- V.A. Verzilov
INFN-LNF, Laboratori Nazionali di Frascati dell'INFN, Frascati, Italy
|
|
| |
Transition radiation (TR) is nowadays intensively exploited
by a number of techniques to characterize different beam
parameters. These methods are based, sometimes implicitly,
on standard formulae, and used often without paying
due attention to their applicability. In particular, standard
expressions are only first-order asymptotic, i.e., strictly
speaking, valid at infinity. In this paper TR is examined in a
spatial domain where conventional results are no more exact
and variations in radiation properties are observed. Under
certain conditions, for example, at long wavelengths or
very high energies the effect is so considerable that should
be taken into account in accurate beam measurements.
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