Browsing by Author "Dowd, RT"
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- ItemApplications of online optimization algorithms for injection at the Australian Synchrotron(JACoW Publishing, 2019-05-19) Auchettl, R; Dowd, RTAccelerators have hundreds of design parameters that makeup the design space. The optimization of complex nonlinear systems (like accelerators) is not straightforward. Trade-offs between competing nonlinear design variables means that optimizing a target objective (such as optics matching) can lack any obvious deterministic method. At the Australian Synchrotron, accelerator tuning predominantly occurs via manual optimization or traditional optimization techniques such as the Linear Optics from Closed Orbits (LOCO) algorithm. While we have had distinct success with the implementation of LOCO [1] and manual tuning, these strategies are not without their downsides. Some situations (such as the optimization of synchrotron beam dynamics) produce a design space too large and multifaceted for manual tuning while implementing LOCO can be computationally expensive. Also, without sufficient diagnostic systems, both LOCO and manual tuning do not necessarily guarantee that the optimal solution will be found. Motivated by the successful implementation of online optimization algorithms at SPEAR3 [2], this paper outlines the application of online optimization algorithms to improve the performance of the Australian Synchrotron injection system. We apply the efficient Robust Conjugate Direction Search (RCDS) Algorithm to reduce beam size in the storage ring.
- ItemBeam dynamics, injection and impedance studies for the proposed single pulsed nonlinear injection kicker at the Australian Synchrotron(JACoW Publishing, 2019-05-19) Auchettl, R; Dowd, RT; Tan, YREThe Australian Synchrotron are currently investigating the use of a single pulsed nonlinear injection kicker (NLK) to free floor space within the ring for future beamline development. The NLK has a zero and flat magnetic field at the stored beam to leave the stored beam undisturbed but has a maximum field off-axis where the injected beam is located. After the kick, the injected beam is stored. While NLKs have been prototyped at many facilities around the world, injection efficiency and heat loading have been the main impediment to deployment of the NLK. The wakefields that pass through the ceramic chamber aperture can cause severe heat loading and impedance. Despite achieving impressive injection efficiencies, a previous prototype at BESSY II * showed that strong interactions of the stored beam resulted in high heat load causing the thin 5µm Titanium coated ceramic chamber to reach temperatures > 500 °C and fail. To avoid beam induced heat loads, this paper presents studies of the wake impedance and thermal behaviour for our proposed NLK design. Injection simulations and future considerations for installation and operation at the Australian Synchrotron will be discussed.
- ItemInvestigation of option for damping trapped IVU resonances(JACoW Publishing, 2018-05-01) Dowd, RT; Chi, WJ; Pelz, DTrapped resonances have been observed within the three In-Vacuum Undulators (IVUs) insertion devices at the Australian Synchrotron. These resonances can create vertical beam instability if not controlled through transverse feedback systems. Similar resonances have been observed at other synchrotron light sources around the world. Under certain conditions of undulator gap, these resonances can couple quite strongly to the beam, requiring high feedback gain. An investigation of the resonances has been carried out using 3D eigenmode and wakefield simulations to understand the resonances and determine the effectiveness of various schemes for modifying the damping the resonances. © 2018 The Authors - CC-BY 3.0 licence
- ItemProceedings of the 10th International Particle Accelerator Conference(JACoW, 2019-05-19) Boland, MP; Tanaka, H; Button, D; Dowd, RT; Schaa, VRW; Tan, YREThe 10th International Particle Accelerator Conference (IPAC’19), will be held in Melbourne, Australia from May 19 -24, 2019. The venue will be the world-leading Melbourne Convention and Exhibition Centre (MCEC) located in the spectacular Southbank precinct and overlooking Melbourne city and Yarra River. IPAC is the main international event for the worldwide accelerator community and industry. Attendees will be presented with cutting-edge accelerator research and development results and gain the latest insights into accelerator facilities across the globe. With over 1000 delegates and 70 industry exhibits, this is a unique opportunity to network with, learn from and meet a wide range of decision makers, opinion leaders, buyers and new kids on the block. Melbourne has been ranked the Word’s Most Liveable City for seven years running and is also the gateway to some of Australia’s most scenic and beautiful regions including the Great Ocean Road, Yarra Valley, Mornington Peninsula, and Central Goldfields. Melbourne itself is home to world-class restaurants, galleries, shopping, and assorted cultural highlights. At IPAC’19, you will have the opportunity to meet and interact with accelerator scientists, engineers, students, and vendors while experiencing the world’s most liveable city.
- ItemSimulations and design of a compact beamline for Inverse compton scattering at the University of Melbourne X-lab.(Australian Institute of Physics, 2022-12-11) Taylor, GN; Volpi, M; Rassool, RP; Dowd, RT; William, SD; Sheehy, SLA presentation of the conceptual design and simulation of a compact beamline using high gradient X-band accelerating structures at the University of Melbourne X-lab which can be used as input for an Inverse Compton Scattering X-ray light source.
- ItemThe southern hemisphere’s first X-band radio-frequency test facility at the University of Melbourne.(Australian Institute of Physics, 2022-12-11) Pushkarna, D; Taylor, GN; Volpi, M; Rassool, RP; Dowd, RT; Williams, SD; Sheehy, SLThe first Southern Hemisphere X-band Laboratory for Accelerators and Beams (X-LAB) is under construction at the University of Melbourne, it will form the basis for developing a compact accelerator for medical applications, such as radiotherapy and compact light sources.
- ItemStatus of the compactlight design study(JACoW Publishing, 2019-05-19) D'Auria, G; Mitri, SD; Rochow, RA; Latina, A; Liu, X; Rossi, C; Schulte, D; Stapnes, S; Wu, X; Castañeda Cortes, HM; Clarke, J; Dunning, DJ; Thompson, N; Fang, W; Gazis, E; Gazis, N; Tanke, E; Trachnas, E; Goryashko, V; Jacewicz, M; Ruber, R; Taylor, G; Dowd, RT; Zhu, D; Aksoy, A; Nergiz, Z; Apsimon, R; Burt, G; Castilla, A; Priem, H; Janssen, X; Luiten, J; Mutsaers, P; Stragier, X; Alesini, D; Bellaveglia, M; Buonomo, B; Cardelli, F; Croia, M; Diomede, M; Ferrario, M; Gallo, A; Giribono, A; Piersanti, L; Scifo, J; Spataro, B; Vaccarezza, C; Geometrante, R; Kokole, M; Arnesano, J; Bosco, F; Ficcadenti, L; Mostacci, A; Palumbo, L; Dattoli, G; Nguyen, F; Petralia, A; Marcos, J; Marín, E; Muñoz Horta, R; Perez, F; Faus-Golfe, A; Han, Y; Bernhard, A; Gethmann, J; Calvi, M; Schmidt, T; Zhang, K; Esperante, D; Fuster, J; Gimeno, B; Gonzalez-Iglesias, D; Aicheler, M; Hoekstra, R; Cross, AW; Nix, L; Zhang, LCompactLight (XLS) is an International Collaboration of 24 partners and 5 third parties, funded by the European Union through the Horizon 2020 Research and Innovation Programme. The main goal of the project, which started in January 2018 with a duration of 36 months, is the design of an hard X-ray FEL facility beyond today’s state of the art, using the latest concepts for bright electron photo-injectors, high-gradient accelerating structures, and innovative shortperiod undulators. The specifications of the facility and the parameters of the future FEL are driven by the demands of potential users and the associated science cases. In this paper we will give an overview on the ongoing activities and the major results achieved until now. © The Authors - CC-BY 3.0 licence