| Paper |
Title |
Page |
| PS19 |
Status of the Delta Synchrotron Light-Monitoring-System
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148 |
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- U. Berges, K. Wille
DELTA, Institute for Accelerator Physics and Synchrotron Radiation, University of Dortmund, Dortmund, Germany
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Synchrotron radiation sources like DELTA need an optical monitoring
system to measure the beam size at different points of the ring with high
resolution and accuracy. An investigation of the emittance of the storage
ring can also be done by these measurements.
Scope of this paper is the investigation of the resolution limit of the
different types of optical synchrotron light monitors at DELTA, a third
generation synchrotron radiation source. At first the normal synchrotron
light monitor is analysed. The minimum measurable electron beamsize at
DELTA is about 80μm. Emphasis is then put on a special synchrotron
light interferometer, developed for DELTA, which has been built up and
tested. This interferometer uses the same beamline and can measure
beamsizes down to about 8μm. So its resolution is about ten times
better and sufficient for the expected small vertical beamsizes at DELTA.
Measurements of the electron beamsize and emittance were done with both
(synchrotron light monitor and interferometer) at different energies.
The image processing system based on a PC Framegrabber generates a
gaussian fit to the images from different synchrotron light-monitors and
calculates the beamsizes and positions.
An investigation of possible reasons of beam movements will be appended,
because the theoretical values of the present optics are smaller than the
measured emittance.
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| PM01 |
Position Monitoring of Accelerator Components as Magnets and Beam Position Monitors
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159 |
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- G. Schmidt, E. Kasel, D. Schirmer, K. Wille
DELTA, University of Dortmund, Germany
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In third generation light sources a large amount of heat load from
synchrotron radiation must be dissipated from the vacuum chamber. The
synchrotron radiation hits the outer chamber wall and leads to a bending
of the vacuum chamber.
Due to the fact that very often beam position monitors are included into
the vacuum chamber, they start to move with increased heat load onto the
vacuum chamber.
An inexpensive and precise method to monitor this movement has been
tested at the Dortmunder Electron Test Accelerator (DELTA). Commercially
available Linear Variable Differential Transformers (LVDTs) have been
used.
In addition it was possible to demonstrate that due to the vacuum chamber
contact to quadrupole magnets the quadrupoles were moving with increasing
beam current leading to a significant orbit drift.
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