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PM10 |
Characterisation of Fast Faraday Cups at the ELETTRA Linac
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113 |
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- M. Ferianis, S. Bassanese, G. D'Auria
ELETTRA, Sincrotrone Trieste, Trieste, Italy
- C. Deibele
SNS, Spalation Neutron Source, Oak Ridge, TN, USA
- M. Poggi
INFN-LNL, Laboratori Nazionali di Legnaro, Legnaro, Italy
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A major upgrade of the ELETTRA injector is currently on going: the 1 GeV
LINAC will be replaced with a 100 MeV LINAC and a 2.5 GeV Booster
Synchrotron. A new set of diagnostics is now under development for these
two new machines. The new Fast Tune measurement system for the Booster
represents a significant improvement as compared to the present Tune
measurement system.
With the Booster cycling at 3 Hz, horizontal and vertical tunes have to be
measured during the energy ramp, whose duration is 160 ms. To completely
characterise the dynamics of the Booster during the energy ramp, a set of
25 tune values has been required, corresponding to a 6.4 ms interval
between successive measurements. The accuracy of this measurement is
<10-3. Such frequency spans are achievable using a Real Time Spectrum
Analyser (Tektronix 3026), which is a fast sampling instrument with
built-in FFT algorithm and data presentation.
In this paper, after describing the system specifications and
architecture, we present the results of the preliminary tests, which have
been carried out both in the laboratory and on the Storage Ring.
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PT25 |
Fast Tune Measurement System for the ELETTRA Booster
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231 |
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- M. Ferianis, S. Bassanese, F. Iazzourene
ELETTRA, Sincrotrone Trieste, Trieste, Italy
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Since several years, the Diagnostic Group at Laboratori Nazionali di
Legnaro (LNL) has been designing Fast Faraday Cups (FFC) to be used on
their Heavy Ion Accelerators; latest developments in this field include a
stripline FFC, jointly developed with SNS, Oak Ridge. A collaborative
partnership has been set-up between LNL and ELETTRA Laboratory to fully
characterize new FFCs, using as electron source the ELETTRA 1 GeV Linac.
Two FFCs, the stripline FFC, built at SNS, and a coaxial FFC, made at
LNL, have been installed at ELETTRA who provided the wideband data
acquisition and the remote control of the measurement. The first
measurements carried out using 1 GHz oscilloscope allowed the proper
set-up of remote control and a low jitter triggering. Wideband
measurements were performed with a sampling scope equipped with 50 GHz
head whereas the bandwidth of the stripline FFC is in the order of 10 GHz.
A complete set of tests has been carried both on the coaxial FFC and on
the stripline FFC. Thanks to the information provided by these wideband
measurements, the Linac working point has been further optimized as well
as the injection process into the ELETTRA SR.
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