| Paper |
Title |
Page |
| TUPC16 |
Ultimate Resolution of Soleil X-Ray Pinhole Camera
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180 |
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- M.-A. Tordeux, L. Cassinari, O. V. Chubar, J.-C. Denard, D. Pédeau, B. Pottin
SOLEIL, Gif-sur-Yvette
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During the commissioning of the SOLEIL Storage Ring, beam emittances have been measured with an X-ray pinhole camera system. The evolution of the system and its performances are presented here. As a result of the excellent alignment of the ring magnets, the vertical beam size is smaller than expected, that led us to an effort towards improving the initial resolution of the instrument. A high sensitivity CCD camera allows us to select the harder X-ray part of the radiation which is a key element for resolution improvement. Finally an evaluation of the ultimate pinhole resolution is made for SOLEIL.
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| TUPC20 |
The SOLEIL BPM and Orbit Feedback Systems
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189 |
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- N. Hubert, L. Cassinari, J.-C. Denard, N. L. Leclercq, A. Nadji, L. S. Nadolski, D. Pédeau
SOLEIL, Gif-sur-Yvette
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SOLEIL is a third generation light source built in France, near Paris. Its BPM system is important for machine studies and for delivering stable beams to the users. A beam stable to 1/10th of the dimensions requires submicron stability in the vertical plane. The monitors, anchored either to the girders or to the ground, are fixed points of the vacuum chamber. Bellows avoid transverse drifts due to mechanical stress. The electronics design was driven by combined efforts through an active communication between accelerator labs (SOLEIL at first, later joined by DIAMOND) and Instrumentation Technologies. The result is the “Libera Electron” beam position processor. It combines a 0.2μm rms resolution and micron level stability for beam delivery with accurate turn-by-turn measurements (3μm resolution at 0.8MHz) for machine commissioning and beam physics studies. It also features position interlock, tune measurement, and postmortem capabilities. A Slow Orbit Feedback for correcting low frequency drifts (0 to 0.1Hz) is currently in operation. The Fast Orbit Feedback to be implemented soon will suppress higher frequency perturbations up to 100Hz.
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| WEPB05 |
Streak Camera Measurements of the SOLEIL Bunch Length
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241 |
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- M. Labat, L. Cassinari, M.-E. Couprie, R. Nagaoka, D. Pédeau
SOLEIL, Gif-sur-Yvette
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A double sweep streak camera (C5680, Hamamatsu) has been installed on the French third generation light source SOLEIL. The visible radiation of the diagnostics beam-line is used to study the longitudinal profile of the stored electron bunches. We report on the commissioning of the streak camera, as well as on its first uses. Measurements of single-bunch length as a function of various machine parameters such as RF cavity voltage and frequency, and beam current with a few picoseconds resolution are reported, and interpreted in terms of vacuum chamber impedance and beam stability.
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