Paper |
Title |
Other Keywords |
Page |
CT04 |
The Beam Inhibit System for TTF II
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diagnostics, instrumentation, linac, electron |
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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PT09 |
Cavity-Type BPMs For The TESLA Test Facility Free Electron Laser
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diagnostics, instrumentation, radio-frequency, undulator, TTF |
190 |
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- H. Waldmann, H.J. Schreiber
DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
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For measurements of the beam position at the undulator section of the
TESLA Test Facility (TTF) at DESY cavity-type beam position monitors were
developed, installed and brought into operation. Besides of some
theoretical aspects results of in-beam measurements at the TTF are
presented and pros and cons of this monitor concept are discussed.
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PT23 |
Transverse Emittance Measurements at the Photo Injector Test Facility at DESY Zeuthen (PITZ)
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diagnostics, emittance, linac, transverse-dynamics, PITZ |
225 |
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PT31 |
Optical Fibre Dosimeter for SASE FEL Undulators
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beam-losses, diagnostics, instrumentation, optics |
248 |
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- M. Körfer
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
- H. Henschel, J. Kuhnhenn
Fraunhofer-INT, Fraunhofer-INT, Euskirchen, Germany
- F. Wulf
HMI, Hahn-Meitner Institut, Berlin, Germany
|
Single pass Free Electron Lasers (FELs) based on self-amplified
spontaneous emission (SASE) are developed for high brightness and short
wavelength applications. They use permanent magnet undulators which are
radiation sensitive devices. During accelerator commissioning beam losses
can appear anywhere along the undulator line. To avoid damage of the
permanent magnets due to radiation, an optical fibre dosimeter system can
be used. The increase of absorption caused by ionizing radiation is
measured in radiation sensitive optical fibers. The dose system enables
relatively fast particle loss tuning during accelerator operation and
allows the monitoring of the accumulated dose. Dose measurements in
narrow gaps which are inaccessible for any other (online) dosimeter type
become possible. The electromagnetic insensitivity of optical fibre
sensor is an advantage of applications in strong magnetic undulator
fields. At each location the light absorption is measured by using an
optical power-meter. The dynamic range is about 50 dB and covers the
linear range of the dose calibration of the fibre. The resolution of the
system is 140 mGy. The time between successive measurements is about 5
minutes. The system was installed and successfully tested at the TESLA
Test Facility TTF1. The fibre sensors will be a standard diagnostic tool
in the soft X-ray user facility TTF2.
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