Paper |
Title |
Other Keywords |
Page |
IT10 |
Advanced Diagnostics of Lattice Parameters in Hadron Colliders
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collider, diagnostics, instrumentation, lattice |
45 |
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- J.-P. Koutchouk
CERN, Geneva, Switzerland
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With a beam stored energy exceeding by several orders of magnitude the
quench level of the magnets and non-negligible non-linear field
components, the control of the beam dynamics and losses in LHC must be
very precise. This is a strong incentive to strengthen as much as
possible the potential of beam diagnostics. This paper reviews some of
the developments in various laboratories that appear to have a large
potential. They either allow for a much better access to classical beam
parameters or for the measurement of quantities formerly not accessible.
Examples are a fast measurement of the betatron tunes, the use of PLL for
reliable tune tracking and feedback, new methods or ideas to measure the
chromaticity with the potential of feedback systems and similarly for the
betatron coupling, the measurement of high-order non-linear fields and
resonances and the potential of AC dipole excitation. This list is bound
to be incomplete as the field is fortunately very dynamic.
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CT05 |
Beam Loss Detection at Radiation Source ELBE
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diagnostics, instrumentation, linac, electron, radiation, beam-transport |
65 |
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- P. Michel, J. Teichert, R. Schurig, H. Langenhagen
FZR, Forschungszentrum Rossendorf, Dresden, Germany
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The Rossendorf superconducting Electron Linac of high Brilliance and low
Emittance (ELBE) delivers an 40 MeV, 1 mA cw-beam for different
applications such as bremsstrahlung production, electron channelling,
free-electron lasers or secondary particle beam generation. In this
energy region in case of collisions of the electron beam with the pipe
nearly all beam power will be deposited into the pipe material. Therefore
a reliable beam loss monitoring is essential for machine protection
at ELBE. Different systems basing on photo multipliers, compton diodes
and long ionization chambers were studied. The pros and cons of the
different systems will be discussed. Ionization chambers based on
air-isolated RF cables installed some cm away parallel to the beam line
turned out to be the optimal solution. The beam shut-off threshold was
adjusted to 1 μC integral charge loss during a 100 ms time interval. Due
to the favourable geometry the monitor sensitivity varies less than ±50%
along the beam line (different shielding conditions).
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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, coherent-effects, damping, feedback, kicker, pick-up |
214 |
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PT30 |
Ionisation Chambers for the LHC Beam Loss Detection
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instrumentation, radiation |
245 |
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PT31 |
Optical Fibre Dosimeter for SASE FEL Undulators
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diagnostics, free-electron-laser, 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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PT32 |
Beam Loss Diagnostics Based on Pressure Measurements
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beam diagnostics, heavy ion beam, instrumentation, synchrotron |
251 |
|
- E. Badura, B. Franczak, W. Kaufmann, P. Horn, H. Reeg, H. Reich-Sprenger, P. Schütt, P. Spiller, K. Welzel, U. Weinrich
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
|
The GSI is operating a heavy ion synchrotron, which is currently
undergoing an upgrade towards higher beam intensities. It was discovered
that beam losses induce a significant pressure increase in the vacuum
system. In order to detect the time constants of the pressure increase
and decrease, fast total pressure measurements were put into operation.
With the recently installed partial pressure diagnostics it is also
possible to follow up which types of molecules are released. The
presentation will focus on the different techniques applied as well as on
some measurement results. The potential and difficulties of this
diagnostic tool will also be discussed.
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