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Title |
Other Keywords |
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| CT01 |
An Inductive Pick-Up for Beam Position and Current Measurements
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pick-up, instrumentation |
53 |
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- M. Gasior
CERN, Geneva, Switzerland
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An Inductive Pick-Up (IPU) senses the azimuthal distribution of the beam
image current. Its construction is similar to a wall current monitor, but
the pick-up inner wall is divided into electrodes and each of which forms
the primary winding of a toroidal transformer. The beam image current
component flowing along each electrode is transformed to a secondary
winding, connected to a pick-up output. Four pick-up output signals drive
an active hybrid circuit, producing two difference signals proportional
to the horizontal and vertical beam positions, and one sum signal,
proportional to the beam current. The bandwidth of these signals, ranging
from below 1 kHz to beyond 150 MHz, exceeds five decades. Each electrode
transformer has an additional turn to which a pulse from a precise
current source is applied to calibrate the sensor for accurate beam
position and current measurements. The IPU has been developed for the
drive beam linac of the CLIC Test Facility 3. For that purpose it had to
be optimized for low longitudinal coupling impedance in the GHz range.
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| PM03 |
Studies of OTR Angular Distribution on CTF2
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diagnostics, instrumentation, optics, transverse-dynamics |
92 |
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- E. Bravin, T. Lefèvre
CERN, Geneva, Switzerland
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Today, Optical Transition radiation (OTR) is widely used in beam
diagnostics. The most common application is the imaging of the transverse
and longitudinal beam profiles. Other beam parameters like divergence and
energy can also be deduced by observing the angular distribution of the
OTR emission (“Donuts”). In order to investigate the possibilities
and the limits offered by this technique we have performed a test on the
48 MeV, 1 nC electron beam of the CLIC Test Facility 2 (CTF2).
Beam divergences between 2 and 6 mrad were measured with an accuracy of
few percent. A good agreement was also found between the energy
measurements obtained with a classical spectrometer and the OTR based
technique. We conclude describing some possible future applications of
OTR based diagnostics for CLIC.
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| PM04 |
OTR from Non-Relativistic Electrons
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diagnostics, instrumentation, optics, transverse-dynamics |
95 |
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- C. Bal, E. Bravin, E. Chevallay, T. Lefèvre, G. Suberlucq
CERN, Geneva, Switzerland
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The CLIC Test Facility 3 (CTF3) injector will provide pulsed beams of
high average current; 5 A over 1.56 μs at 140 keV. For transverse beam sizes
of the order of 1mm, as foreseen, this implies serious damages to the
commonly used scintillating screens. Optical Transition Radiation from
thermal resistant radiators represents a possible alternative. At low
energy the OTR emission is feeble and distributed over a large solid
angle. In order to investigate the feasibility of such a diagnostic
studies have been carried out on a test 80 keV photo injector. The
experimental set-up is described and the results are compared to the
calculations based on the OTR emission theory. Our conclusions for the
design of the CTF3 injector profile monitor are also given.
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