| Paper |
Title |
Page |
| MOPG59 |
Time Correlated Single Photon Counting Using Different Photon Detectors |
201 |
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- L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
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Time Correlated Single Photon Counting (TCSPC) is used in accelerators to measure the filling pattern and perform bunch purity measurements. The most used photon detectors are photomultipliers (PMTs), generally used to detect visible light; and Avalanche Photo-Diodes (APDs), which are often used to detect X-rays. At ALBA synchrotron light source, the TCSPC using a standard PMT has been developed and is currently in operation and further tests are performed using an APD. This work presents the experimental results using both detectors, and compares their performances.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-MOPG59
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| MOPG73 |
Transverse Beam Size Diagnostics using Brownian Nanoparticles at ALBA |
248 |
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- M. Siano, B. Paroli, M.A.C. Potenza
Universita' degli Studi di Milano & INFN, Milano, Italy
- A. Goldblatt, S. Mazzoni, G. Trad
CERN, Geneva, Switzerland
- U. Iriso, A.A. Nosych, L. Torino
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
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In this work we describe a novel beam diagnostic method based on coherence characterization of broad-spectrum bending magnet radiation through the Heterodyne Near Field Scattering (HNFS) technique. HNFS is a self-referencing technique based on the interference between the transmitted beam and the spherical waves scattered by each particle of a colloidal suspension. The resulting single-particle interferogram shows circular fringes modulated by the spatio-temporal Complex Coherence Factor (CCF) of the radiation. Superposition of a number of these patterns results in a stochastic speckle field, from which spatial and temporal coherence information of the source can be retrieved in near field conditions. Here we describe the basics of this technique, the experimental setup mounted along the hard X-ray pinhole at the ALBA synchrotron light source, and the possibility of transverse electron beam size retrieval from the spatial coherence function of the emitted dipole radiation. We also show preliminary results concerning power spectral density of visible synchrotron radiation as obtained from temporal coherence.
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Poster MOPG73 [1.804 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-MOPG73
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| WEBL03 |
Beam Shape Reconstruction Using Synchrotron Radiation Interferometry |
589 |
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- L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
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Synchrotron Radiation Interferometry (SRI) through a double-aperture system is a well known technique to measure the transverse beam size using visible light. In many machines the beam is tilted in the transverse plane, but the SRI technique only allows to directly measure the size of the projection of the beam shape along the axis connecting the two apertures. A method to fully reconstruct the beam in the transverse plane using SRI has been developed and successfully tested at the ALBA synchrotron light source. This report shows the full beam reconstruction technique and presents the results at ALBA. Moreover, we also discuss how this technique could improve the measurement of very small beam sizes, improving the resolution of standard SRI.
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Slides WEBL03 [20.443 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-WEBL03
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