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Title |
Other Keywords |
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| CT07 |
Fast DSP Using FPGAs and DSOs for Machine Diagnostics
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diagnostics, injection, digital-signal-processing |
71 |
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- G.A. Naylor
ESRF, European Synchrotron Radiation Facility, Grenoble, France
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Digital signal processing using digital signal processors is now a mature
field for machine diagnostics, giving significant benefits, in particular
when used to analyze BPM signals for tune measurement and fast feedback
systems. We discuss here digital signal processing using Field
Programmable Gate arrays (FPGAs) with large gate counts and intelligent
oscilloscopes. These offer great potential for the analysis of very fast
signals to maximize the information extracted from high bandwidth
sensors.
- FPGAs allow data to be filtered numerically and treated at the speed
of data collection of A/D converters in the 100 MHz range. Parallel,
fast and continuous treatment of BPM and FCT signals is possible.
Examples are given of injection efficiency, turn by turn injection
efficiency, turn by turn beam position, amplitude and phase calculation
with averaging over each turn or many turns.
- Modern oscilloscopes include much computational power. In-built DSPs
can perform correlations on the traces allowing the application of
FIR filters. Some oscilloscopes incorporate a PC and allow on-board
manipulation of the data using MATLAB. An example is given using an
FIR applied to a 5 GHz oscilloscope to extend its time response to
measure electron bunch lengths less than 100 ps with 1 ps resolution.
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| PM16 |
Wire Scanner Beam Profile Measurement For ESRF
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wire scanner, beam profile, transfer line, emittance |
131 |
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- A.B. El-Sisi
NRC, Atomic Energy Authority, NRC, Plasma and Nuclear Fusion Dept., Cairo, Egypt
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Method of beam transverse profile measurement in accelerator by wire
scanner is wide spread in accelerator field. The wire scanner is used in
beam transfer lines of European Synchrotron Radiation Facility (ESRF) to
provide data for beam profiles, which is being used in emittance
measurements. The beam energy in the first transport line is 200 MeV and
the peak current is 25 mA. The purpose of the scanner is to provide
horizontal and vertical beam profiles. This work will discuss the
operation of the wire scanner, and the first results of the scanner in
ESRF. By changing the value of focus quad at (de focus quad = 18 A) we get
the emittance value for the vertical plane. The value is 1.5·10-6 mrad.
When we used this value to simulate our result we find that the
simulation gives good fitting with real values of vertical plane. Also by
changing the value of the focus quad at (focus quad = 10.46 A) we
get the emittance value for the horizontal plane. The value is 2·10-7
mrad. And we find that the simulation gives good fitting with real
values.
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