| Paper |
Title |
Other Keywords |
Page |
| IT01 |
The Future of Nuclear Physics in Europe and the Demands on Accelerators techniques
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antiproton, diagnostics, heavy ion, superconductivity |
3 |
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- W.F. Henning
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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Future large-scale facilities for research are very much under discussion
in Europe. This results, of course, on the one hand from the discussions
in the science communities and their identification of new frontiers in
research; but it also reflects to a certain degree the trend to pool
resources among the countries towards what has been labeled the “European
Research Area”.
In the field of nuclear physics and/or its intersections with particle
physics, several such efforts have been under consideration or are
underway. This applies to the study of the subnuclear degrees of freedom
of the strong interaction system(s) as well as to the extremes of the
atomic nucleus as the many-body system of the strong force.
In this talk an attempt is made to summarize the present status and
future plans, with emphasis on the facility concepts and their demands on
accelerator technology and development
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| PM06 |
An Improved PLL for Tune Measurements
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diagnostics, controls, instrumentation, transverse-dynamics |
101 |
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- O. Berrig
CERN, Geneva, Switzerland
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The key element determining the dynamic performance of such a PLL is the
phase detector between the beam oscillation and the internal oscillation.
Most circuits use a quadrature phase detector, for which the high
frequency carrier at twice the excitation frequency is attenuated by a
low-pass circuit. The remaining ripple of this component contributes to
the bandwidth/noise performance of the PLL.
In this paper we propose an alternative solution for the filter, notably
an adaptive notch filter. We explain in detail design considerations and
the resulting improvements in PLL bandwidth and/or noise figure.
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| PM17 |
Development of a Permanent Magnet Residual Gas Profile Monitor With Fast Readout
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diagnostics, heavy ion, instrumentation, storage-ring |
134 |
| |
- 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, storage-ring, ion |
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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| PT19 |
Transverse Feedback System For The Cooler Synchrotron COSY-Jülich - First Results
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storage-ring, beam cooling, beam-losses, coherent-effects, damping, feedback, kicker, pick-up |
214 |
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| PT32 |
Beam Loss Diagnostics Based on Pressure Measurements
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beam-losses, beam diagnostics, heavy ion beam, instrumentation |
251 |
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- E. Badura, B. Franczak, W. Kaufmann, P. Horn, H. Reeg, H. Reich-Sprenger, P. Schütt, P. Spiller, K. Welzel, U. Weinrich
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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The GSI is operating a heavy ion synchrotron, which is currently
undergoing an upgrade towards higher beam intensities. It was discovered
that beam losses induce a significant pressure increase in the vacuum
system. In order to detect the time constants of the pressure increase
and decrease, fast total pressure measurements were put into operation.
With the recently installed partial pressure diagnostics it is also
possible to follow up which types of molecules are released. The
presentation will focus on the different techniques applied as well as on
some measurement results. The potential and difficulties of this
diagnostic tool will also be discussed.
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