Paper |
Title |
Other Keywords |
Page |
PM17 |
Development of a Permanent Magnet Residual Gas Profile Monitor With Fast Readout
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diagnostics, heavy ion, instrumentation, synchrotron |
134 |
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- T. Giacomini, P. Forck
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
- V. Skachkov, A. Gobulev, D.A. Liakin
ITEP, Institute for Theoretical and Experimental Physics, Moscow, Russia
- A. Vetrov
MSU, Moscow State University, MSU, Moscow, Russia
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Modern ion accelerators and storage rings require very fast beam profile
measurements (turn-by-turn) with highest resolutions. We propose a new
residual gas monitor, which will operate on secondary electrons whose
trajectories are localized within ∅ 0.1 mm filaments along 0.1 T uniform
magnetic field lines excited by a permanent magnet. The best way to adopt
the resolution of 0.1 mm into the data acquisition system is the use of a
CCD camera with upstream MCP-phosphor screen assembly. To realize a fast
turn-by-turn beam profile measurement a photodiode readout by a
100-channel amplifier/digitizer is foreseen.
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PM19 |
Ionisation Beam Profile Monitor at the Cooler Synchrotron COSY-Jülich
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diagnostics, instrumentation, ion, synchrotron |
140 |
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- V. Kamerdzhiev, J. Dietrich
IKP, Forschungszentrum Jülich, Germany
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For beam profile measurements, a residual-gas ionisation beam profile
monitor using a position sensitive micro channel plate (MCP) detector was
developed and installed at the cooler synchrotron and storage ring
COSY at Forschungszentrum Julich.
A parallel ion drift field is maintained in the gap between two
electrodes. Residual gas ions are drifted onto an MCP assembly that
provides a charge gain of about 107. For online calibration the detector
can be illuminated with an α-source. The secondary charge produced from
each ion is collected by a wedge and strip anode. After some processing
the charge signal is digitized and read out by means of a PC running
Cobold PC software.
Since COSY operates with beam intensities up to 1011 protons and a vacuum
of 10-9 mbar, there is a high risk of detector damage. The lifetime of
the channel plates and the event rate are crucial issues for the profile
measurement of intense proton beams. The aging of the channel plates
(i.e. inhomogeneous decrease of the gain) were investigated using
scanning electron microscope and energy dispersive x-ray microanalysis.
Different implemented detector protection mechanisms are discussed.
Measurements with electron cooled beams are reported.
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PT01 |
Beam Position And Phase Measurements Using A FPGA For The Processing Of The Pick-Ups Signals
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diagnostics, pick-up |
169 |
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- G.A. Naylor, E. Plouviez, G.F. Penacoba
ESRF, European Synchrotron Radiation Facility, Grenoble, France
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We have implemented the signal processing needed to derive the transverse
beam position and the beam phase from the signals of a four electrodes
BPM block on a FPGA (field programmable gate array). The high processing
rate of a FPGA allows taking the full benefit of the high data
acquisition rate of the most recent ADC circuits. In addition, it is
possible to implement on a FPGA a processing algorithm exactly tailored
to the measurement of the beam parameters. The efficiency of the signal
processing has also been improved by a careful choice of the frequency of
the sampling clock and of the RF front-end local oscillator, which are
derived from the storage ring RF frequency. This paper describes the BPM,
the RF front-end electronics and the FPGA algorithm. It presents some of
the application of this BPM at ESRF and gives measurement results.
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PT19 |
Transverse Feedback System For The Cooler Synchrotron COSY-Jülich - First Results
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synchrotron, beam cooling, beam-losses, coherent-effects, damping, feedback, kicker, pick-up |
214 |
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PT25 |
Fast Tune Measurement System for the ELETTRA Booster
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booster, diagnostics, electron, instrumentation |
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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PT28 |
Current Measurements of Low-Intensity Beams at CRYRING
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diagnostics, pick-up |
240 |
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- A. Paal, A. Simonsson, A. Källberg
MSI, Manne Siegbahn Laboratory of Physics, Stockholm, Sweden
- J. Dietrich, I. Mohos
IKP, Forschungszentrum Jülich GmbH, Jülich, Germany
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The demand for new ion species leads to an increasing number of cases in
which the ions can only be produced in small quantities. Thus, weak ion
currents quite often have to be handled in low energy ion storage ring,
like CRYRING. Various detector systems have been developed to measure
such low intensity coasting and bunched beams by using the overlapping
ranges of those systems.
- We have extended the RMS resolution to 1 nA of the Bergoz Beam
Charge Monitor (BCM) by using a low noise 60 dB preamplifier for
the Integrating Current Transformer.
- The sum signal of a capacitive pick-up is integrated by a second
gated integrator and the BCM output signal is used for calibration.
The RMS resolution is about 100 pA..
- To measure the coasting beam intensity, neutral particle detectors
have been built. The fast Microchannel plate detector can handle
1 Mc/s, and a 50 Mc/s Secondary Electron Multiplier based detector
is under construction. On the magnetic flat top, a time of 100 ms
is available to calibrate the count rate of the neutral particle
detectors during each machine cycle.
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