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abstract:
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A 9-cell standing-wave deflecting cavity has recently
been constructed and installed at the UCLA Neptune Lab-
oratory for use as a temporal diagnostic for the 13 MeV,
300 to 700 pC electron bunches generated by the Neptune
photoinjector beamline. The cavity is a center-fed Glid-
Cop structure operating in at TM110-like deflecting mode
at 9.59616 GHz with a π phase advance per cell. At the
maximum deflecting voltage of 530 kV, the theoretical res-
olution limit of the device is 50 fs, although with current
beam parameters and a RMS spot size of 460 μm the ef-
fective resolution is approximately 400 fs. We discuss the
operation and testing of the cavity as well as its intended
application of measuring the temporal current profile of
ramped electron bunches generated using the Neptune dog-
leg compressor, and we present the first measurements of
the electron beam current profile obtained using the deflect-
ing cavity.
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