Paper |
Title |
Other Keywords |
Page |
IT04 |
Fast Positional Global Feedback for Storage Rings
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feedback, dipole, power-supply, damping |
7 |
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PT01 |
Closed-orbit correction using the new beam position monitor electronic of Elsa Bonn
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quadrupole, electron, resonance, alignment |
153 |
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- J. Dietrich, I. Mohos, J. Keil
IKP, Forschungszentrum Jülich GmbH, Jülich, Germany
|
RF and digital electronics, developed at the
Forschungszentrum Jülich/IKP were integrated to form
the new beam position monitor (BPM) system at the
Electron Stretcher Accelerator (ELSA) of the University
of Bonn. With this system the preservation of the
polarization level during acceleration was currently
improved by a good correction of the closed-orbit. All
BPM offsets relative to the magnetic quadrupole centers
were determined by the method of beam-based alignment.
The optics functions measured by the BPM system are in
good agreement with theoretical predictions.
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PT06 |
New digital BPM system for the Swiss light source
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feedback, storage-ring, booster, alignment |
168 |
|
- M. Dehler, A. Jaggi, P. Pollet, T. Schilcher, V. Schlott, R. Uršič, R. deMonte
PSI, Paul Scherrer Institut, Villigen, Switzerland
|
This paper presents a new digital beam position monitor
(DBPM) system which is currently under development
for the Swiss Light Source (SLS). It is designed to
provide sub-micron position data in normal closed orbit,
and feedback mode as well as turn by turn information
for machine studies and real time tune measurements.
The self calibrating four channel system consists of a RF
front end, a digital receiver and a DSP module. The same
electronics will be used in all sections of the SLS accelerator
complex. The system can be reconfigured in real
time to perform different kind of measurements like:
pulsed for linac and transfer lines, first turn, turn-by-turn,
closed orbit, feedback and even tune mode for booster
and storage ring. These reconfigurations only involve
downloading of new signal processing software and will
be performed via EPICS control system. An independent
system for monitoring mechanical drifts of the BPM stations
will be installed as well. The measured data will be
permanently updated in a database and taken into account,
when processing the final electron beam positions.
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PT09 |
The closed-orbit measurement system for the CERN antiproton decelerator
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antiproton, pick-up, vacuum, shielding |
177 |
|
- M. LeGras, L. Søby, D.J. Williams
CERN, Geneva, Switzerland
|
The closed-orbit measurement system for the new
Antiproton Decelerator (AD) employs 59 electrostatic
pick-ups (PU). The intensity range from 2·1010 down to
107 particles poses challenging demands on the dynamic
range and noise of the head amplifier. A low noiseamplifier
has been developed, having an equivalent input
noise of 0.6nV/√(Hz), allowing beam positions to be
measured to ±0.5 mm with 5·106 particles. Two
different gains take care of the large dynamic range.
After amplification and multiplexing, the PU signals are
fed to a network analyser, where each measurement
point corresponds to one PU. The network analyser is
phase locked to the RF of the AD, thus acting as a
tracking filter instrument. An orbit measurement takes
from 0.2 to 12 s depending on the IF-bandwidth of the
network analyser, selected according to the beam
intensity, and the precision required. At the end of the
network analyser sweep the data are read via a GPIB
interface and treated by a real-time task running in a
VME based Power PC.
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