| Paper |
Title |
Page |
| CT04 |
The Beam Inhibit System for TTF II
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62 |
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- D. Nölle, P. Göttlicher, R. Neumann, D. Pugachov, K. Wittenburg, M. Wendt, M. Werner, H. Schlarb, M. Staack
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
- M. Desmons, A. Hamdi, M. Jablonka, M. Loung
CEA, Commissariat à l'Energie Atomique, Saclay, France
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The new generation of light sources based on SASE Free-Electron-Lasers
driven by LINACs operate with electron beams with high beam currents and
duty cycles. This is especially true for the superconducting machines
like TTF II and the X-RAY FEL, under construction or planning at DESY.
Elaborate fast protections systems are required not only to protect the
machine from electron beams hitting and destroying the vacuum chamber,
but also to prevent the machine from running at high loss levels,
dangerous for components like the FEL undulator.
This paper will give an overview over the different protection systems
currently under construction for TTF II. The very fast systems, based on
transmission measurements and distributed loss detection monitors, will
be described in detail. This description will include the fast
electronics to collect and to transmit the different interlock signals.
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| CT06 |
Timing Sicknesses in Control Systems: Causes, Cure and Prevention
|
68 |
| |
- M. Werner
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
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| |
In some cases, Trigger Generators or Data Acquisition Systems used for
Beam Diagnostics show undefined or unreliable timing behavior. This
presentation identifies common reasons, ways to fix the problems and some
general rules to avoid them from the beginning. Examples will be given to
discuss causes for e.g. double bunches and timing and trigger jumps,
periodic as well as randomly. It will be discussed, how proper layout,
timing calculations and timing measurements can avoid these inconvenient
effects in advance.
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| PM24 |
Parasitic Bunch Measurement in e+/e- Storage Rings
|
149 |
| |
- M. Seebach, M. Werner
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
- H. Franz, A. Ehnes
DESY-HASYLAB, Deutsches Elektronen-Synchrotron, Hamburg, Germany
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The lepton storage rings DORIS and PETRA at DESY are used as sources for
synchrotron radiation experiments. In normal operation the distance
between the bunches should be 96 ns in PETRA and 192 ns in DORIS. The
adjacent buckets must not have any stored particles or, in reality, as
few as possible. This is particularly important for time triggered photon
measuring experiments. The principle of the 'parasitic bunch' measurement
down to a fraction of 10-6 of the main bunch within 20 seconds are
described. Additionally, the sources of the 'parasitic bunches' and the
actions to minimize them are discussed.
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