| Paper |
Title |
Other Keywords |
Page |
| IT02 |
Overview of the Diagnostics Systems of SOLEIL and DIAMOND
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diagnostics, instrumentation, sychrotron radiation, pick-up, SOLEIL, DIAMOND |
6 |
| |
- J.-C. Denard, L. Cassinari
SOLEIL, Societé Synchrotron Soleil, Saint-Aubin, France
- M. Dykes, R. Smith
ASTec, Daresbury Laboratory, Daresbury, UK
| |
SOLEIL and DIAMOND are two third-generation light sources in construction
in France and in Great Britain respectively. SOLEIL is scheduled to
deliver its first photons to its users in 2006 and DIAMOND in 2007. This
talk will present the beam diagnostic systems of both projects with
emphasizing technological novelties and the instruments that are
essential to their performances: BPM system, profile monitors and
feedback systems.
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| IT07 |
Digital Signal Processing in Beam Instrumentation: Latest Trends and Typical Applications
|
diagnostics, instrumentation, controls, betatron, closed-orbit |
30 |
| |
- M.E. Angoletta
CERN, Geneva, Switzerland
| |
During the last decade digital signal processing has found its way into
the beam instrumentation arena, to become an essential part of several
beam diagnostic systems. In fact, the recent impressive hardware
performance improvement made it possible for functions once exclusively
accomplished by analogue methods, to be enhanced by the application of an
alternative digital approach. This is true to a point that the conversion
to digital processing has become inevitable. Factors that favour crossing
the border towards digital implementation are obviously speed as well as
precision, signal-to-noise ratio, dynamic range, stability of components
and configuration capability, together with the availability of powerful
and user-friendly development tools. Improvement in A/D conversion and
processing speed has allowed successfully developing digital feedback
loops and on-line diagnostics. The ascent of such digital techniques
generated a concurrent and parallel interest in digital signal processing
algorithms and in the use of the associated digital hardware components.
Current trends in beam diagnostics include using Digital Signal
Processors (DSPs), Field Programmable Gate Arrays (FPGAs), digital
receivers and fast digitizers. The talk reviews latest developments and
illustrates selected digital applications, relevant to the beam
diagnostic area.
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|
| CT08 |
Capabilities of the ELETTRA/SLS Multibunch Feedback Electronics
|
diagnostics, instrumentation, transverse-dynamics |
74 |
| |
- M. Dehler, R. Kramert, P. Pollet, D. Bulfone, M. Lonza
PSI, Paul Scherrer Institut, Villigen, Switzerland
| |
Due to the unavailability of commercial ADC and DAC boards, first
commissioning of the transverse multi bunch feedback was done in the last
year using loaned equipment from Sincrotrone Trieste. In order to remedy
that situation, development of ADC and DAC VME boards was started. The
boards do a 500 MS/s data conversion with an 8 bit resolution. The ADC
and DAC circuits are separate modules containing their own one to four
de-/multiplexing electronic reducing the data rate to 125 MS/sec. The
following stage being a common design to both ADC and DAC allows data
recording and play back using on board RAM and allows freely programmable
multiplexing/demultiplexing ratios of one to five to one to twelve. The
digital data streams flow via Front Panel Digital Ports (FPDP). A special
design criterion were low system latencies ensuring a high feedback
efficiency. Apart from lab tests, we report on full feedback system test
and show the feedback performance in the transverse and longitudinal
planes.
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|
| PT06 |
Dynamic X-Y Crosstalk / Aliasing Errors of Multiplexing BPMs
|
instrumentation, diagnostics, pick-up, monitoring, operational-performance, controls |
181 |
| |
- T. Straumann
SLAC, Stanford Linear Accelerator, Stanford, CA, USA
| |
Multiplexing Beam Position Monitors (BPM) are widely used for their
simplicity and inherent drift cancellation property. These systems
successively feed the signals of (typically four RF) pickups through one
single detector channel. The beam position is calculated from the
demultiplexed (base band) signal. However, as shown by this contribution,
transverse beam motion results in positional aliasing errors due to the
finite multiplexing frequency. Fast horizontal motion, for example, can
alias into an apparent, slow vertical position change. A thorough
analysis is presented and the impact of essential parameters such as the
multiplexing rate and the scanning pattern/sequence of classical 4-button
pickups is discussed.
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| PT19 |
Transverse Feedback System For The Cooler Synchrotron COSY-Jülich - First Results
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storage-ring, synchrotron, beam cooling, beam-losses, coherent-effects, damping, kicker, pick-up |
214 |
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