A5017541166- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Electron and X-Ray Spectroscopy Techniques
- Advanced Data Storage Technologies
- Advancements in Photolithography Techniques
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Optical measurement and interference techniques
- Magnetic confinement fusion research
- Distributed and Parallel Computing Systems
- Electromagnetic Compatibility and Measurements
- Optical Systems and Laser Technology
- Non-Destructive Testing Techniques
- Microwave Imaging and Scattering Analysis
- Advanced Chemical Physics Studies
- Advanced Measurement and Metrology Techniques
- Microwave and Dielectric Measurement Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Adaptive optics and wavefront sensing
- Crystallography and Radiation Phenomena
ALBA Synchrotron (Spain)
2006-2024
Roslin Cells (United Kingdom)
2021
European Organization for Nuclear Research
2017
Universität Hamburg
2016
Universitat Autònoma de Barcelona
2006-2008
Brookhaven National Laboratory
2004-2006
RIKEN BNL Research Center
2006
Synchrotron radiation interferometry (SRI) is widely used in particle accelerators to monitor the transverse beam profile, and thus critical emittance parameter. We introduce a novel technique SRI using closure amplitudes, inspired by radio interferometry, determine two-dimensional profile of synchrotron beam. Previous techniques have required multiple interferograms or accurate estimates non-uniform aperture illuminations. In contrast, our method amplitudes avoids need estimate...
Synchrotron radiation interferometry (SRI) is widely used in particle accelerators to monitor the transverse beam profile, and thus critical emittance parameter. We introduce a novel technique SRI using closure amplitudes, inspired by radio interferometry, determine two-dimensional profile of synchrotron beam. Previous techniques have required multiple interferograms or accurate estimates non-uniform aperture illuminations. In contrast, our method amplitudes avoids need estimate...
Linear optics measurements and correction for charged particle beams are reviewed, including the historical path, recent trends, a comparison of different approaches, providing valuable reference years to come.
Since 2001, the Relativistic Heavy Ion Collider has experienced electron cloud effects, some of which have limited beam intensity. These include dynamic pressure rises (including instabilities), tune shifts, a reduction instability threshold for bunches crossing transition energy, and possibly incoherent emittance growth. We summarize main observations in operation dedicated experiments as well countermeasures including baking, nonevaporable getter coated warm pipes, solenoids, bunch...
The $N$ beam position monitor method ($N$-BPM) which was recently developed for the LHC has significantly improved precision of optics measurements that are based on BPM turn-by-turn data. main improvement is due to consideration correlations statistical and systematic error sources, as well increasing amount combinations used derive $\ensuremath{\beta}$-function at one location. We present how this technique can be applied light sources like ALBA, compare results with other methods.
The electron cloud effect has been studied by means of detailed simulation codes that typically track the particles' evolution under influence corresponding electromagnetic forces and fields. In this paper we show that, for RHIC case, can be treated from an abstract point view as a bunch to using simple maps. Secondly, how treatment yields useful conclusion, which is otherwise difficult obtain: fixed number bunches total beam current in RHIC, it possible determine best way distribute pattern...
Molecular desorption coefficients from electron bombardment of the warm Relativistic Heavy Ion Collider beam pipe are derived measurements for both baked and unbaked stainless steel. For this, we analyze detector pressure gauge signals in presence an cloud. Finally, present a comparison between measured simulated energy spectrum cloud electrons.
Transverse beam coupling impedance is a source of instabilities that limits the machine performance in circular accelerators. Several based techniques have been used to measure transverse an accelerator, usually on optics distortion produced by itself. Beam position monitor turn-by-turn analysis for characterization has employed large circumference machines, while synchrotron light sources mainly slow orbit techniques. Instead, work presented this paper uses first time data at ALBA advance...
In this paper we report on recent two-dimensional (2D) electron beam size measurements with a nonconventional synchrotron radiation interferometric technique based x-ray heterodyne near field speckles (HNFS). The method relies Fourier analysis of the random speckle patterns generated by water suspension nanospheres to assess full 2D transverse coherence incoming x rays. horizontal and vertical sizes are then retrieved means statistical optics approaches. manuscript thoroughly describes HNFS...
Standard quadrupole beam-based alignment (BBA) techniques rely on orbit data and the sequential variation of corrector magnets (OCM). This results in time-consuming measurements order several hours most circular accelerators. Fast (10 kHz) beam position monitors (BPM) OCMs with ac power supplies are routinely used modern synchrotron light sources to drive fast feedback systems. In this paper we show how they can be employed also dramatically reduce time for any BBA minutes only, ensuring...
For frequencies below 10 MHz the classical two wire transmission line method is subject to difficulties in sensitivity and measurement uncertainties. Thus for evaluation of low frequency transverse impedance properties LHC dump kicker a modified version has been used. It consists, present case, turn loop approximately 1 meter length 2 cm width. The change input measured as function surroundings by using proper reference (metallic beam pipe) these changes are converted into meaningful...
Since 2001 RHIC has experienced electron cloud effects, which have limited the beam intensity. These include dynamic pressure rises - including instabilities, tune shifts, a reduction of stability threshold for bunches crossing transition energy, and possibly incoherent emittance growth. We summarize main observations in operation dedicated experiments, as well countermeasures baking, NEG coated warm pipes, solenoids, bunch patterns, anti-grazing rings, pre-pumped cold scrubbing, with long...
A methodology has been developed to perform electrical characterization of the stripline BPMs for future Gamma Beam System ELI Nuclear Physics facility in Romania. Several prototype units are extensively benchmarked and results presented this paper. The BPM sensitivity function is determined using a uniquely designed motorized test bench with stretched wire measure response map. Here, feedthroughs connected Libera Brilliance electronics fed by continuous wave signal, while two...
Electron clouds sometimes limit accelerator performance by their appearance when the circulating bunch population exceeds a threshold value. Dynamical models of cloud buildup, and phase transition from ``cloud off'' to on'', are enhanced simple coupling between electron ion is included. Maps then capable reproducing first order transitions seen in practice. They also predict that hysteresis, period doubling, chaotic phenomena may be observed.
Beam induced pressure rise in RHIC warm sections is one of the machine luminosity limits. The electron cloud and beam transition are discussed. Countermeasures studies for upgrade reported.
The extraction system for the CLIC Damping Rings has very tight specifications. Therefore a full characterisation of behaviour stripline kicker under conditions as close possible to expected working will be valuable. To that end been installed in ALBA Synchrotron Light Source and characterised with beam. Prior its installation, effect on machine impedance assessed. installation required design an absorber screen from synchrotron radiation additional BPMs have better kick angle determination....
We demonstrate the shape-orientation-size conservation principle for a three-element interferometer using aperture plane masking at ALBA visible synchrotron radiation light source. then use these data to image self-calibration.
Double-aperture Young interferometry is widely used in accelerators to provide a one-dimensional beam measurement. We improve this technique by combining and further developing techniques of non-redundant aperture masking self-calibration from astronomy. Using visible synchrotron radiation, tests at the ALBA show that method provides an accurate two-dimensional transverse characterisation, even single 1ms interferogram. The resistant phase fluctuations might be introduced vibration optical...
We demonstrate the Shape-Orientation-Size conservation principle for a 3-element interferometer using aperture plane masking at ALBA visible synchrotron radiation light source. then use these data to Image Plane Self-Calibration.
Emittance measurements using synchrotron radiation are usually performed x-rays to avoid diffraction limits. Interferometric techniques visible light also used measure either the horizontal or vertical beam projection. Several rotating interferometry axis needed obtain a full reconstruction. In this report we present new interferometric multi-aperture masking technique and data analysis, inspired by astronomical methods, that able provide 2-D transverse reconstruction in single acquisition....
Double-aperture young interferometry is widely used in accelerators to provide a one-dimensional beam measurement. We improve this technique by combining and further developing techniques of nonredundant, two-dimensional, aperture masking, self-calibration from astronomy. Using visible synchrotron radiation, tests at the ALBA show that method provides an accurate two-dimensional transverse characterization, even single 1 ms interferogram. The nonredundancy mask enables it be resistant...