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145 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3, 4, 5, 6, 7, 8 [Next/Last]

Instruments / Technical Area	Publication Details	Published
Accelerator Physics	Storage ring design for synchrotron radiation sources R. Bartolini DOI: 10.1007/978-3-030-23201-6_7 Show Abstract ▼ Abstract: Modern storage ring light sources have been very successful in providing high-flux, high-brightness, highly stable photon beams for many scientific applications. Their success is underpinned by sophisticated lattice designs that allow small emittance electron beams to be reached with a large complement of straight sections for insertion devices. The design of such lattices is in continuous evolution, with the most modern trends aiming at diffraction-limited storage rings. In this chapter we review the users’ requirements and their implications on the storage ring design strategies. The rationale of the design based on double-bend achromats (DBA) and triple-bend achromats (TBA) isare presented along with the most recent solutions based on multi-bend achromats (MBA) and damping wigglers. The strategies for the optimizsation of the linear and nonlinear optics are discussed. We conclude with a review of the injection schemes, including nonlinear pulsed kicker injection and the implications of top-up operation.	May 2020
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
Accelerator Physics	Injection studies for the proposed Diamond-II storage ring I. P. S. Martin , R. Bartolini , H. Ghasem , J. Kennedy , B. Singh IPAC2019 DOI: 10.18429/JACoW-IPAC2019-WEPMP043 Open Access Show Abstract ▼ Abstract: The baseline design for the Diamond-II storage ring consists of a Modified-Hybrid 6-Bend Achromat, combining the ESRF-EBS low-emittance cell design with the DDBA mid-straight concept,. This cell design provides sufficient dynamic aperture to permit an off-axis injection scheme, provided the emittance of the injected beam is sufficiently low. In this paper we present simulations of an injection scheme using the anti-septum concept**, along with the design of an upgrade to the existing booster synchrotron. Alternate injection strategies are also discussed.	Jun 2019
Electrical Engineering	Early commissioning simulation of the Diamond storage ring upgrade H. Ghasem , M. Apollonio , R. Bartolini , J. P. Kennedy , I. P. S. Martin IPAC2019 DOI: 10.18429/JACoW-IPAC2019-TUPGW076 Open Access Show Abstract ▼ Abstract: A low beam emittance lattice has been designed for up-grade of the Diamond storage ring. Due to the use of strong focusing elements and rather small vacuum chamber and considering the required short dark time, commissioning of the designed storage ring becomes very challenging. This paper briefly explains the progress of early commissioning simulations of the storage ring, gives the required engineering tolerances, presents the first simulation results and discusses the non-linear beam dynamics (NLBD) issues after successful commissioning with and without insertion devices (IDs).	Jun 2019
Electrical Engineering	Harmonic cavity design choice for lifetime increase in Diamond-II Teresia Olsson , R. Bartolini , I. P. S. Martin IPAC2019 DOI: 10.18429/JACoW-IPAC2019-TUPGW078 Open Access Show Abstract ▼ Abstract: The ongoing trend towards synchrotron light storage rings with ultralow emittance leads to a requirement for strong magnet gradients, which reduce the dynamic aperture and thus the Touschek lifetime of the machine. This is also the case for the planned upgrade of the Diamond Light Source. One option to increase the Touschek lifetime is to lengthen the electron bunches with a harmonic cavity operated close to a harmonic of the fundamental RF frequency. This paper presents studies of a harmonic cavity for Diamond-II with the focus on maximising the lifetime increase. It is foreseen that the ring will have to operate with a gap in the fill pattern to avoid instabilities and therefore multiparticle tracking was used to determine the effect on stability and lifetime for various cavity parameters taking into account transient beam loading.	Jun 2019
Magnets Optics	Impact of the DIAD wiggler and ’missing-sextupole’ optics on the Diamond storage ring I. P. S. Martin , R. Bartolini , B. Singh IPAC2019 DOI: 10.18429/JACoW-IPAC2019-TUPGW077 Open Access Show Abstract ▼ Abstract: In order to generate space for a short, out-of-vacuum multipole wiggler for the DIAD beamline, a single sextupole was removed from one of the DBA arcs in the Diamond Storage Ring during June 2018. The removal of this sextupole presented a number of challenges to the operation of the storage ring, requiring a re-optimisation of the remaining sextupole strengths*, a change in tune-point and modification of the orbit and coupling correction schemes. In this paper we describe the implementation of these changes, and provide an assessment of the impact that the installed wiggler has made on the storage ring parameters.	Jun 2019
Accelerator Physics	Genetic optimisation of beamline design for DIAMOND F. Bakkali Taheri , M. Apollonio , R. Bartolini , B. Singh IPAC2019 DOI: 10.18429/JACoW-IPAC2019-THPGW071 Open Access Show Abstract ▼ Abstract: The problem of optimisation of beamline structures is studied, from the point of view of multi-objective genetic algorithms. While this approach has been successfully used in the exploration of potential particle accelerator lattices, it has never been applied to beamline design. In this paper, the Non-Dominated Sorting Genetic Algorithm II (NGSA II) is used to optimize a structure where photons are assumed to propagate through the optical elements according to the wavefront model as implemented in SRW. It is shown that appropriate objective functions can help to set up an interesting set of parameters, with competitive computational resources compared to the traditional approach. Examples illustrating this optimization method are shown in the context of DIAMOND.	Jun 2019
Optics	Exploratory lattice design studies for Diamond-II B. Singh , R. Bartolini , J. Bengtsson , H. Ghasem , I. P. S. Martin IPAC2019 DOI: 10.18429/JACoW-IPAC2019-TUPGW079 Open Access Show Abstract ▼ Abstract: We pursue Robust Design of a Ring-Based Synchrotron Light Source as a System. In particular, the Design Philosophy is based on: ’ To Control the Nonlinear Dynamics: Control the Linear Optics. In particular, by: ’ Optimal Control of Natural Chromaticity. ’ ’-I Transformer’ between Chromatic Sextupoles for Unit Cell. ’ Higher-Order-Achromat for Super Period. In addition, by pushing the Requirements for Robust & Efficient Injection ’Upstream’, i.e., by considering On-Axis Injection, and by utilizing Reverse Bends (to trans-cend the reductionist Theoretical Minimum Emittance Cell), either: ’ the Natural Emittance can be reduced further, ’ or the Touschek Lifetime can be improved. Bottom line, a Design Choice.	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

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