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| IT04 |
Review of Emittance and Stability Monitoring Using Synchrotron Radiation Monitors
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instrumentation, diagnostics, emittance, synchrotron-radiation |
16 |
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- K. Holldack, J. Feikes, W.B. Peatman
BESSY, Berlin, Germany
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Different techniques of emittance and stability monitoring using bend
magnet and undulator radiation will be reviewed. Besides imaging methods
for emittance monitoring , the problem of XBPM's used for the measurement
of the centre of mass position of the undulator beams will be treated in
detail. The key feature of these monitors is a careful electron optical
design to take account of gap dependent changes of the shape and photon
energy of the undulator beam as well as spurious signals from dipoles and
high heat load. The reason for the fact that these monitors work well on
low energy machines like BESSY II but often fail due in high energy
machines will be demonstrated by experimental results obtained on
different types of BESSY II insertion devices such as undulators,
wavelength shifters, multipole wigglers and electromagnetic undulators.
Experimental results of global and local orbit monitoring and a proof of
principle of a XBPM-based local feedback will be shown.
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| PS11 |
Test of Different Beam Loss Detectors at the GSI Heavy Ion Synchrotron
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instrumentation, diagnostics, beam-losses, GSI |
129 |
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- P. Forck, T. Hoffmann
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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For the sensitive process of slow extraction from a synchrotron
a reliable control of the beam losses is needed.
We have tested several types of particle detectors mounted
at the extraction path of the SIS: A BF-tube for pure neutron
detection, a liquid and a plastic scintillator detecting
neutrons, gammas and charged particles and an Argon filled
ionization chamber mainly sensitive to charged particles.
While the count rate is quite different, the time evolution of
all detector signals during the spill are similar, but the plastic
scintillator has the highest dynamic range. This type is
going to be used for beam alignment.
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| PM05 |
Functionality Enhancement of the Multiplexing BPM System in the Storage of SRRC
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instrumentation, diagnostics, SRRC, pick-up, closed-orbit |
171 |
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- J. Chen, C.S. Chen, K.H. Hu, K.T. Hsu, C.H. Kuo, D. Lee, K.K. Lin
SRRC, Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
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An extension of existing multiplex BPM electronics to provide capability
for turn-by-turn beam position and phase advance measurement is
implemented. The system can be configured as turn-by-turn beam position
measurement or phase advance and coupling measurement. For turn-by-turn
mode, the system performed four consecutive measurements of four BPM
buttons. Data acquisition is synchronize with beam excitation.
Turn-by-turn beam position is reconstructed by these four independent
measurements. This system was named as pseudo-turn-by-turn beam position
monitor system (PTTBPM). Resonance excitation of the stored beam and
adopting lock-in techniques can measure betatron phase and local
coupling. Design considerations of the system and preliminary beam test
results are presented in this report.
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| PM06 |
The Low Gap BPM System at ELETTRA: Commissioning Results
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instrumentation, diagnostics, ELETTRA, closed-orbit, pick-up |
174 |
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- M. Ferianis, R. De Monte
ELETTRA, Sincrotrone Trieste, Trieste, Italy
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Two Low Gap BPMs have been successfully installed
at ELETTRA and have now completed the commissioning
phase. The main purpose of these new devices is to
provide stable beam position measurement, at sub-micron
level, to monitor the stability of the light delivered to the
Users. The improvements with respect to the normal BPM
system have been obtained adopting both a new Low Gap
BPM sensor and a new non-multiplexed BPM detector,
the latter being developed in co-operation with the SLS
diagnostic group at the PSI. Beside the Closed Orbit
mode, thanks to the digitally selectable bandwidth, the
new BPM detector can be operated also in the Turn-by-Turn
mode and provide the position signal to feedback loops.
In this paper we first briefly review the system
architecture, describing its mechanical and electronic
parts. Then, we present the digital BPM detector set-up
used at ELETTRA and the associated firmware required
by the four-channel BPM detector to guarantee
performance over the full dynamic range. The BPMposition
monitoring system is also described and its
integration in the BPM system presented. Laboratory tests
confirmed sub-micron resolution at 10kHz data rate. A
series of beam based measurements have been performed
in order to test this system and to verify the improvement
in performance. The system is presently used in the
control room as a powerful beam quality monitor; its
extension to other Storage Ring straight sections is under
evaluation.
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| PM16 |
The Measurement and Optimisation of Lattice Parameters on the ISIS Synchrotron
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instrumentation, diagnostics, ISIS, lattice |
204 |
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- D.J. Adams, K. Tilley, C.M. Warsop
RAL, Rutherford Appleton Lab., Oxfordshire, UK
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The ISIS Synchrotron accelerates a high intensity proton beam from 70 to
800 MeV at 50 Hz. Recent hardware upgrades to the diagnostics,
instrumentation and computing have allowed turn by turn transverse
position measurements to be made. A special low intensity beam can also
be injected for detailed diagnostic measurements. The analysis of such
data at many points around the ring has allowed the extraction of lattice
parameters. This information will have significant application for
improved beam control. The methods of analysis as well as some
applications for setting up and optimising the machine are described in
this paper. Future plans and relevance for high intensity performance is
also given.
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