Performance of BPM Readout Electronic Based on Pilot-Tone Generator and a Modified Libera Spark at ALBA
108
L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
As many synchrotron radiation sources, ALBA is also going through an upgrade project. At the same time, the world of BPM electronic is evolving fast to keep up with the stringent requirement of new facilities. In order to follow the situation closely and develop know-how for the future, we decided to install and test in our storage ring a BPM readout system composed by a Pilot-Tone generator (developed by Elettra) and a modified Libera Spark (by Instrumentation Technologies). We compare position measurement results and stability with the ones obtained by our standard Libera Brilliance and a Libera Brilliance+ electronics.
Two-Dimensional Beam Size Measurements with X-Ray Heterodyne Near Field Speckles
176
M. Siano, L. Teruzzi
Università degli Studi di Milano, Milano, Italy
D. Butti, A. Goetz, T. Lefèvre, S. Mazzoni, G. Trad
CERN, Meyrin, Switzerland
U. Iriso, A.A. Nosych, E. Solano, L. Torino
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
B. Paroli, M.A.C. Potenza
Universita’ degli Studi di Milano & INFN, Milano, Italy
We report on 2D beam size measurements with a novel interferometric technique named Heterodyne Near Field Speckles, capable of resolving few-micrometer beam sizes. It relies on the interference between the weak spherical waves scattered by a colloidal suspension and the intense transilluminating X-ray beam. Fourier analysis of the resulting speckles enables full 2D coherence mapping of the incoming radiation, from which the beam sizes along the two orthogonal directions are retrieved. We show experimental results obtained with 12.4 keV X-rays at the NCD-SWEET undulator beamline at ALBA, where the vertical beam size has been changed between 5 and 15 micrometers by varying the beam coupling. The results agree well with the estimated beam sizes from the pinhole calculations. Finally, we discuss recent investigations on alternative targets aimed at improving the signal-to-noise ratio of the technique.
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