IBIC2015 - List of Authors (Iriso, U.)

Paper	Title	Page
TUPB046	Integration of the Diamond Transverse Multibunch Feedback System at ALBA	414
	A. Olmos, U. Iriso, J. Moldes, F. Pérez ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain M.G. Abbott, G. Rehm, I.S. Uzun DLS, Oxfordshire, United Kingdom
	A Transverse Multi-Bunch Feedback system (TMBF) has been commissioned at the ALBA storage ring for stabilization of the beam instabilities. The system is based on the Libera Bunch-By-Bunch electronics, controlled using a specific software developed at Diamond Light Source. This system refurbishes the existing FPGA code to include several features for machine studies, like fast and precise tune measurements using a Phase Locked Loop, sequences of grow-damp experiments that allow measuring damping rates on a mode-by-mode basis, and precise bunch cleaning. We describe the TMBF system and the integration of the control software into the ALBA machine. Finally we show examples of beam stabilization and machine studies using this system.
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TUPB047	Electrostatic Finite-element Code to Study Geometrical Nonlinear Effects of BPMs in 2D	418
	A.A. Nosych, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain J. Olle UAB, Barcelona, Spain
	We have developed a 2D finite element-based software for Matlab to study non-resonant effects in BPMs of arbitrary geometry, in particular the geometric nonlinearities. The developed code called BpmLab utilizes an open-source tetrahedral mesh generator DistMesh, combined with a short implementation of FEM with linear basis functions to find the electrostatic field distribution for boundary electric potential excitation. The BPM response as a function of beam position is calculated in a single simulation for all beam positions using the potential ratios, according to the Green's reciprocity theorem. The code offers ways to correct the geometrical nonlinear distortion, either by polynomials or by direct inversion of the electrode signals through numerical optimization. This work is an overview of the BpmLab capabilities to date, including its extensive benchmarking and validation against other methods
	Poster TUPB047 [8.291 MB]
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TUPB048	Measurements and Calibration of the Stripline BPM for the ELI-NP facility with the Stretched Wire Method	423
	A.A. Nosych, C. Colldelram, A. Crisol, U. Iriso, A. Olmos ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain F. Cioeta, A. Falone, A. Ghigo, M. Serio, A. Stella INFN/LNF, Frascati (Roma), Italy A. Mostacci Rome University La Sapienza, Roma, Italy
	A methodology has been developed to perform electrical characterization of the stripline BPMs for the future Gamma Beam System of ELI Nuclear Physics facility in Romania. Several prototype units are extensively benchmarked and the results are presented in this paper. The BPM sensitivity function is determined using a uniquely designed motorized test bench with a stretched wire to measure the BPM response map. Here, the BPM feedthroughs are connected to Libera Brilliance electronics and the wire is fed by continuous wave signal, while the two software-controlled motors provide horizontal and vertical motion of the BPM around the wire. The electrical offset is obtained using S-parameter measurements with a Network Analyzer (via the "Lambertso" method) and is referenced to the mechanical offset.
	Poster TUPB048 [4.978 MB]
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TUPB049	Limitations and Solutions of Beam Size Measurements via Interferometry at ALBA	428
	L. Torino, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The interferometry beamline at ALBA had several limitations which have been overcome over the past years until currently, beam size measurements are successfully performed using this technique. The main limitation has been related to vibrations in the light wavefront transportation along the beamline. Several counter-measures have been taken to overcome these limitations, related both to the software analysis and the mechanical setup, where the conventional double slit system is substituted by a double pinhole in order to obtain more light and a better interferogram. This report describes the current interferometry setup at ALBA, and show some results.
	Poster TUPB049 [1.077 MB]
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Paper

Title

Page

Integration of the Diamond Transverse Multibunch Feedback System at ALBA

414

A. Olmos, U. Iriso, J. Moldes, F. Pérez
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
M.G. Abbott, G. Rehm, I.S. Uzun
DLS, Oxfordshire, United Kingdom

A Transverse Multi-Bunch Feedback system (TMBF) has been commissioned at the ALBA storage ring for stabilization of the beam instabilities. The system is based on the Libera Bunch-By-Bunch electronics, controlled using a specific software developed at Diamond Light Source. This system refurbishes the existing FPGA code to include several features for machine studies, like fast and precise tune measurements using a Phase Locked Loop, sequences of grow-damp experiments that allow measuring damping rates on a mode-by-mode basis, and precise bunch cleaning. We describe the TMBF system and the integration of the control software into the ALBA machine. Finally we show examples of beam stabilization and machine studies using this system.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB047

Electrostatic Finite-element Code to Study Geometrical Nonlinear Effects of BPMs in 2D

418

A.A. Nosych, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
J. Olle
UAB, Barcelona, Spain

We have developed a 2D finite element-based software for Matlab to study non-resonant effects in BPMs of arbitrary geometry, in particular the geometric nonlinearities. The developed code called BpmLab utilizes an open-source tetrahedral mesh generator DistMesh, combined with a short implementation of FEM with linear basis functions to find the electrostatic field distribution for boundary electric potential excitation. The BPM response as a function of beam position is calculated in a single simulation for all beam positions using the potential ratios, according to the Green's reciprocity theorem. The code offers ways to correct the geometrical nonlinear distortion, either by polynomials or by direct inversion of the electrode signals through numerical optimization. This work is an overview of the BpmLab capabilities to date, including its extensive benchmarking and validation against other methods

Poster TUPB047 [8.291 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB048

Measurements and Calibration of the Stripline BPM for the ELI-NP facility with the Stretched Wire Method

423

A.A. Nosych, C. Colldelram, A. Crisol, U. Iriso, A. Olmos
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
F. Cioeta, A. Falone, A. Ghigo, M. Serio, A. Stella
INFN/LNF, Frascati (Roma), Italy
A. Mostacci
Rome University La Sapienza, Roma, Italy

A methodology has been developed to perform electrical characterization of the stripline BPMs for the future Gamma Beam System of ELI Nuclear Physics facility in Romania. Several prototype units are extensively benchmarked and the results are presented in this paper. The BPM sensitivity function is determined using a uniquely designed motorized test bench with a stretched wire to measure the BPM response map. Here, the BPM feedthroughs are connected to Libera Brilliance electronics and the wire is fed by continuous wave signal, while the two software-controlled motors provide horizontal and vertical motion of the BPM around the wire. The electrical offset is obtained using S-parameter measurements with a Network Analyzer (via the "Lambertso" method) and is referenced to the mechanical offset.

Poster TUPB048 [4.978 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB049

Limitations and Solutions of Beam Size Measurements via Interferometry at ALBA

428

L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The interferometry beamline at ALBA had several limitations which have been overcome over the past years until currently, beam size measurements are successfully performed using this technique. The main limitation has been related to vibrations in the light wavefront transportation along the beamline. Several counter-measures have been taken to overcome these limitations, related both to the software analysis and the mechanical setup, where the conventional double slit system is substituted by a double pinhole in order to obtain more light and a better interferogram. This report describes the current interferometry setup at ALBA, and show some results.

Poster TUPB049 [1.077 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)