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- P. Odier
CERN, Geneva, Switzerland
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Wall current monitors (WCM) are commonly used to observe the time profile
of particle beams. In CTF3, a test facility for the future CERN Linear
Collider CLIC, high current electron beams of 1.5 μs pulse length are
bunched at 3 GHz and accelerated in a Linac working in fully loaded mode,
for which a detailed knowledge of the time structure along the pulse is
mandatory. The WCM design is based on an earlier version developed for
CTF2, a previous phase of the test facility, in which the beam duration
was only 16 ns. Due to the longer pulse width the low frequency cut-off
must be lowered to 10 kHz while the high frequency cut-off must remain at
10 GHz. The new WCM therefore has two outputs: a direct one for which an
increase of the inductance results in a 250 kHz to 10 GHz bandwidth while
the second one, using an active integrator compensating the residual
droop, provides a 10 kHz to 300 MHz bandwidth. The new WCM has been
installed in CTF2 late 2002 in order to test its high frequency
capabilities prior to its use in CTF3. Design considerations and first
results are presented.
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