| Paper | Title | Other Keywords | Page | ||
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| PM05 | Optical Transmission Line For Streak Camera Measurements at Pitz | diagnostics, electron, gun, optics, PITZ | 98 | ||
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The photoinjector injector test facility at DESY Zeuthen (PITZ) [1]
produces electrons with a momentum of about 4 MeV/c. It is the aim to
measure the temporal characteristics of the electron bunch train and
single bunches with high accuracy of the order of 1 ps and less. Several
types of streak cameras will be used in combination with different
radiators which transform particle energy in light. The problem to be
solved is the light transport over a distance of about 27 m. Basic demands
to the optical system and design principles will be explained. The
optical and technical solutions will be presented. The strategy of
adjustment and commissioning of the optical system will be described. The
system contains switchable optics to use different radiators (OTR,
Cherenkov radiators). Diagnostic tools are foreseen at different
positions along the optical axis. The results of different measurements
in the lab and using the original system will be presented. The problems
on the minimalization of the time dipersion in the system will be
discussed.
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[1] F.Stephan, et al., Photo injector test facility under construction at DESY Zeuthen, FEL 2000, Durham |
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| PM28 | Application of Beam Diagnostics for Intense Heavy Ion Beams at the GSI UNILAC | heavy ion, linac, space charge | 161 | ||
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With the new High Current Injector (HSI) of the GSI UNILAC the beam pulse
intensity had been increased by approximately two orders of magnitudes.
The HSI was mounted and commissioned in 1999; since this time the UNILAC
serves as an injector for the synchrotron SIS, especially for high
uranium intensities. Considering the high beam power of up to 1250 kW and
the short stopping range for the UNILAC beam energies (≤12 MeV/u),
accelerator components could be destroyed, even during a single beam
pulse. All diagnostic elements had to be replaced preferably by
non-destructive devices. The beam current is mainly measured by beam
transformers instead of Faraday cups, beam positions are measured with
segmented capacitive pick-ups and secondary beam monitors instead of
profile harps. The 24 installed pick-ups are also used to measure
intensities, widths and phase of the bunches, as well beam energies by
evaluating pick-ups at different positions. The residual gas ionization
monitors allow on-line measurements of beam profiles. The knowledge of
the real phase space distribution at certain position along the linac is
necessary for optimizing the machine tuning, for the improvement of the
matching to the synchrotron and for a better understanding of beam
dynamic issues under space charge conditions. The paper will report the
application of different beam diagnostic devices for the measurement of
transverse beam emittances at different UNILAC beam energies and for
different beam intensities. Additionally, measurements of the bunch
structure after the HSI and a the design of a new device for the
measurement of the longitudinal emittance at the end of the UNILAC will
be included.
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| PT12 | Beam Phase Measurements in the AGOR Cyclotron | diagnostics, instrumentation, cyclotron, ion | 193 | ||
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Beamphase measurement to optimize the isochronism is an essential part of
the diagnostics in multi-particle, multi-energy cyclotrons. In the AGOR
cyclotron an array of 13 nondestructive beamphase pick-ups is installed.
To reduce the large disturbances from the RF-system the measurements are
traditionally performed at the 2nd harmonic of the RF-frequency. To
further improve the sensitivity intensity modulation of the beam has been
introduced. This creates side-bands in the Fourier spectrum, that are
completely free of interference from the RF-system. These side-bands
contain information on both the beamphase with respect to the
accelerating voltage and the number of revolutions up to the radius of
the measurement. A specific case is intensity modulation at the orbital
frequency, where the side-bands contain only information on the
beamphase. Measurements with the different methods will be presented,
demonstrating that the intensity modulation strongly improves the
sensitivity of the measurement. Useful beamphase measurements can now be
made for beam intensities down to 10 nA.
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| PT22 | Measurement of the longitudinal phase space at the Photo Injector Test Facility at DESY Zeuthen | diagnostics, electron | 222 | ||
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The photo injector test facility at DESY Zeuthen (PITZ) has been
developed with the aim to deliver low emittance electron beams and study
its characteristics for future applications at free electron lasers and
linear accelerators. The energy of the electron beam varies in the range
between 4 and 5 MeV. One of the important properties of the delivered
beam is the longitudinal phase space of the electron beam. Measurements
of the momentum distributions show a small energy spread. The principle
of the measurement of the bunch length will be discussed, time
resolutions will be shown and preliminary results will be given. The
design to measure the correlation between momentum and time distribution
of the electron bunch will be shown with calculated resolutions.
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