Paper |
Title |
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CT02 |
Single Shot Measurements of the 4-Dimensional Transverse Phase Space Distribution of Intense Ion Beams at the UNILAC at GSI
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56 |
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- L. Groening, W. Barth
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
- D.A. Liakin
ITEP, Institute for Theoretical and Experimental Physics, Moscow, Russia
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The UNILAC is used as an injector for the synchrotron SIS. It is designed
to fill the synchrotron up to its space charge limit. The upper limit for
the useful beam emittance of the UNILAC is given by the finite acceptance
of the SIS during the injection process. In order to remain within this
acceptance the emittance growth during beam acceleration and
transportation due to space charge effects must be minimized by applying
an appropriate beam focusing. Therefore, the influence of the magnetic
focusing strength on the beam emittance growth was investigated
experimentally for different beam currents. Measurements of transverse
phase space distributions were performed before and after the Alvarez
accelerator with a periodic focusing channel, respectively. In order to
perform such a wide parameter scan within a reasonable time with respect
to machine stability, the pepper pot technique was applied. The pepper
pot method allows for single-pulse measurements. For comparison several
measurements using the slit-grid technique, which averages over many
pulses, were performed. Both transverse planes were measured
simultaneously. Using two pepper pot devices more than 60 single shot
measurements of the full 4-dimensional transverse phase space
distribution were performed within 8 hours. In this paper we report on
the results of the measurements and we compare them to beam dynamic
simulations and we give an outlook on further developments on pepper pot
devices.
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PM17 |
Development of a Permanent Magnet Residual Gas Profile Monitor With Fast Readout
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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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PM27 |
Multifunction Test-Bench For Heavy Ion Sources
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158 |
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- S. Barabin, V. Batalin, A. Kozlov, T. Kulevoy, R. Kuybida, D.A. Liakin, A. Orlov, V. Pershin, S. Petrenko, D. Selezniov, Yu. Stasevich
ITEP, Institute for Theoretical and Experimental Physics, Moscow, Russia
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The new test-bench for heavy ion sources has been created in ITEP. It is
planned to equip test-bench with a set of measurement devices to cover
wide range of beam widths, divergences, durations, currents etc. It will
provide measurements of different heavy ion beams parameters,
particularly, emittance and charge state distribution. The last parameter
may be measured both by the time-of-flight method and with the magnet
analyzer. Two emittance measurement devices will be installed. It will be
possible to use both slit/grid and CCD based "pepperpot" methods, which
will give advantages of combination of classical emittance measurements
with performance of the CCD based devices. The detailed description of
test-bench and its equipment is presented. The first results at MEVVA ion
source and beam investigations are discussed.
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PM29 |
A Modular VME Data Acquisition System for Counter Applications at the GSI Synchrotron
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164 |
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- D.A. Liakin
ITEP, Institute for Theoretical and Experimental Physics, Moscow, Russia
- T. Hoffmann, P. Forck
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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Particle counters perform the control of beam loss and
slowly extracted currents at the heavy ion synchrotron
(SIS) at GSI. A new VME/Lynx - PC/Linux based data
acquisition system has been developed to combine the
operating purposes beam loss measurement, spill analysis,
spill structure measurement and matrix switching
functionality in one single assembly. In this paper a
detailed PC-side software description is presented. To
achieve best system stability, the software has been
divided into time critical networking and data deploying
threads and low or normal priority interface tasks. Some
new abilities in the fields of data computation and
presentation are reported. A hardware description is
presented, in detail a programmable GSI-EVENT controller,
which is based on an ordinary 8 bit RISC microprocessor and
which has been integrated into the system, to synchronize
the data acquisition with the sophisticated virtual
accelerator timing at GSI. First experiences gained while
the commissioning of the system are discussed.
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