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26 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3 [Next/Last]

Instruments / Technical Area	Publication Details	Published
Magnets	Reduction of stored beam oscillations during injection at Diamond Light Source R. T. Fielder , M. Apollonio , R. Bartolini , C. Bloomer , I. P. S. Martin IPAC2019 DOI: 10.18429/JACoW-IPAC2019-WEPMP042 Open Access Show Abstract ▼ Abstract: At Diamond injection is performed by means a of a four kicker off-axis system, relying on a perfect timing and amplitude setting to produce a closed bump. Ageing of some of the kicker vessel components has progressively spoiled the performance of the system, causing oscillations in the stored beam. Various schemes to control these oscillations have been considered including introducing an additional compensating kicker, and installing a non-linear injection kicker. Results of simulations analysing these schemes are presented, along with measurements taken in the storage ring using an existing pinger magnet. The effects of the reduction on the quality of beam seen by beamlines is also considered.	Jun 2019
Magnets Optics	Characterization of the double-double bend achromat lattice modification to the Diamond Light Source storage ring I. P. S. Martin , M. Apollonio , R. T. Fielder , Ei. Koukovini-Platia , B. Singh , R. Bartolini Physical Review Accelerators And Beams 21 DOI: 10.1103/PhysRevAccelBeams.21.060701 Open Access Show Abstract ▼ Abstract: The Diamond storage ring has recently been modified by replacing one of the original double bend achromat (DBA) cells with a double-DBA (DDBA) cell. The new cell marks a fundamental break to the machine symmetry, and the final engineered solution shares many design features in common with modern multi-bend achromat cells. In this paper we review the impact that the modification has had on the linear and nonlinear optics, collective effects, and overall performance. Where appropriate, comparison to model predictions are also made.	Jun 2018
Controls	Online multi objective optimisation at diamond light source M. Apollonio , R. Bartolini , R. T. Fielder , I. P. S. Martin , G. Henderson , J. Rogers 9th International Particle Accelerator Conference DOI: 10.18429/JACoW-IPAC2018-WEPAF054 Open Access Show Abstract ▼ Abstract: At Diamond Light Source we have developed an Optimization Package currently used online to improve the performance of the machine, usually measured in terms of lifetime, injection efficiency or beam disturbance at injection. The tool is flexible in that control variables in order to optimise objectives (or their functions) can be easily specified by means of EPICS process variables (PV), making it suitable for virtually any sort of optimization. At present three different algorithms can be used to perform optimizations in a multi-objective fashion: Multi-Objective Genetic Algorithm (MOGA), Particle Swarm Optimizer (MOPSO) and Simulated Annealing (MOSA). We present a series of tests aimed at characterizing the algorithm as well as improving the performance of the machine itself.	Jun 2018
Diagnostics Magnets Mechanical Engineering Optics Vacuum	Double-double bend achromat cell upgrade at the Diamond Light Source: From design to commissioning R. Bartolini , C. Abraham , M. Apollonio , C. P. Bailey , M. P. Cox , A. Day , R. T. Fielder , N. P. Hammond , M. T. Heron , R. Holdsworth , J. Kay , I. P. S. Martin , S. Mhaskar , A. Miller , T. Pulampong , G. Rehm , E. C. M. Rial , A. Rose , A. Shahveh , B. Singh , A. Thomson , R. P. Walker Physical Review Accelerators And Beams 21 DOI: 10.1103/PhysRevAccelBeams.21.050701 Open Access Show Abstract ▼ Abstract: Diamond has recently successfully commissioned a major change in the lattice consisting of the substitution of a standard double-bend achromat (DBA) cell with a modified four-bend achromat (4BA) cell called “double-double bend achromat” (DDBA). This work stems from the original studies initiated in 2012 towards a Diamond upgrade and provides the benefit of an additional straight section in the ring available for insertion devices. This paper reviews the DDBA design and layout, the implications for technical subsystems, the associated engineering challenges and the main results of the commissioning completed in April 2017.	May 2018
Insertion Devices RF	Multi-Bunch Instabilities Measurement and Analysis at the Diamond Light Source Riccardo Bartolini , R. Fielder , E. Koukovini-platia , G. Rehm IPAC2017 DOI: 10.18429/JACoW-IPAC2017-THPVA028 Open Access Show Abstract ▼ Abstract: The characterisation of the multi-bunch dynamics at the Diamond light source is performed with an advanced TMBF system that is capable of operating fast grow damp experiments thus allowing the exploration of many machine conditions. We report here the latest results of the measurement campaign, the implication on the machine impedance model and some of the intricacies of the analysis and interpretation of the experimental data.	May 2017
Mechanical Engineering	Electron beam commissioning of the ddba modification to the diamond storage ring I. P. S. Martin , M. Apollonio , C. P. Bailey , C. Christou , R. T. Fielder , M. J. Furseman , E. Koukovini-platia , T. Pulampong , G. Rehm , W. Rogers , B. Singh , R. Bartolini IPAC2017 DOI: 10.18429/JACoW-IPAC2017-WEPAB095 Open Access Show Abstract ▼ Abstract: The Diamond storage ring has been modified by replacing one of the existing double bend achromat (DBA) cells with a double-DBA (DDBA) cell*. This change represents the largest modification to the storage ring since it was first commissioned in 2006, and was installed and fully commissioned during a single 8 week shutdown in autumn 2016. In view of this tight schedule, the planned commissioning steps and all high-level software needed to be developed and thoroughly tested in advance. Electron beam commissioning occupied the final 2 weeks of the shutdown, during which the injected electrons were captured and accumulated, the correct linear lattice was established, the nonlinear beam dynamics were studied, IDs were closed and the target 300 mA was achieved. This paper presents an overview of these activities.	May 2017
NONE-No attached Diamond beamline Insertion Devices	Studies to Install a Multipole Wiggler by Removing a Chromatic Sextupole in the Diamond Storage Ring B Singh , Marco Apollonio , Riccardo Bartolini , Richard Fielder , Eirini Koukovini-platia , Ips Martin , T Pulampong , Rp Walker 7th International Particle Accelerator Conference, 8 – 13 May, 2016. Busan, Korea. DOI: 10.18429/JACoW-IPAC2016-THPMR050 Open Access Show Abstract ▼ Abstract: Investigations are underway for the possible use of an achromat to install a short multipole wiggler by removing a chromatic sextupole in cell-11 of the storage ring. The effect on emittance and energy spread are found to be small, however the impact on lifetime and injection are very significant if the chromaticity is corrected normally (globally). The MOGA genetic algorithm is used to optimize the lifetime and injection efficiency in this case. We used local mirror chromatic sextupole and other chromatic sextupole family for chromaticity correction in which case the genetic algorithm found solution that restores lifetime and injection efficiency. In this paper the results of MOGA simulations using various schemes for chromaticity correction and test results in presently operational optics will be discussed.	Jun 2016
Accelerator Physics Theoretical Physics	ANALYSIS OF MULTI-BUNCH INSTABILITIES AT THE DIAMOND STORAGE RING Riccardo Bartolini , Richard Fielder , Guenther Rehm , V Smaluk IPAC2016 Show Abstract ▼ Abstract: We present the result of the analytical, numerical and experimental analysis of multi-bunch instabilities at the Diamond storage ring. This work compares the impedance estimates with CST with the analysis of the growth rates of the excited multi-bunch modes in different machine configurations. The contribution of a number of wakefield sources has been identified with very high precision thanks to high quality data provided by the existing TMBF diagnostics.	May 2016
Accelerator Physics	SINGLE BUNCH INSTABILITY STUDIES AT DIAMOND LIGHT SOURCE E. Koukovini-platia , M. Apollonio , R. Bartolini , R. Fielder , I. Martin IPAC2016 Show Abstract ▼ Abstract: Single bunch instability thresholds, the associated coherent tune shifts and the bunch lengthening have been studied at Diamond light source for nominal optics. Measurements were taken under different settings of chromaticity, radiofrequency (RF) voltage and aperture of the insertion devices (IDs). The macro-particle code sbtrack was used to evaluate the instability thresholds and bunch lengthening where different impedance contributions are taken into account such as the resistive wall impedance, a broad-band resonator model and inductive impedance for the longitudinal plane. A comparison of simulation using the developed model impedance with measurements is shown for all cases.	May 2016
Diagnostics	Beam-based model of broad-band impedance of the Diamond Light Source Victor Smaluk , Ian Martin , Richard Fielder , Riccardo Bartolini Physical Review Special Topics - Accelerators And Beams 18 DOI: 10.1103/PhysRevSTAB.18.064401 Open Access Show Abstract ▼ Abstract: In an electron storage ring, the interaction between a single-bunch beam and a vacuum chamber impedance affects the beam parameters, which can be measured rather precisely. So we can develop beambased numerical models of longitudinal and transverse impedances. At the Diamond Light Source (DLS) to get the model parameters, a set of measured data has been used including current-dependent shift of betatron tunes and synchronous phase, chromatic damping rates, and bunch lengthening. A matlab code for multiparticle tracking has been developed. The tracking results and analytical estimations are quite consistent with the measured data. Since Diamond has the shortest natural bunch length among all light sources in standard operation, the studies of collective effects with short bunches are relevant to many acilities including next generation of light sources.	Jun 2015

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