| Paper |
Title |
Page |
| 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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| PM18 |
Residual Gas Fluorescence for Profile Measurements at the GSI UNILAC
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137 |
| |
- A. Bank, P. Forck
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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The high beam currents, delivered at the LINAC at GSI (UNILAC) can
destroy intercepting diagnostics within one macro-pulse. As an
alternative for a non-destructive profile measurement the methode for
residual-gas-fluorescence is investigated. The fluorescence light is
emitted by the N2 molecules of the residual gas at the blue wavelength
range and can be monitored with a modern CCD-camera. The images are
transferred via digital bus (IEEE 1394 'FireWire') and the profiles are
generated by analysis of the images with a modern software tool (National
Instruments 'LabView'). Due to the short beam pulses (about 0.2 ms) the
light intensities emitted by the residual gas are low and require a high
amplification (gain >106) which is realized with an image intensifier
with double MCP (multi channel plate), connected with a fiber taper to
the CCD-chip. The design parameters of the optics and electronics are
discussed as well as the advantages of the digital data transmission.
Measurements with heavy ion beams of several 100 μA and a comparison to
other profile measurement methods show a good signal-to-noise ratio and
prove a good applicability.
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| PM29 |
A Modular VME Data Acquisition System for Counter Applications at the GSI Synchrotron
|
164 |
| |
- 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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