TY - CONF AU - Charles, T.K. AU - Aumon, S. AU - Holzer, B.J. AU - Oide, K. AU - Zimmermann, F. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Low Emittance Tuning of FCC-ee J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The FCC-ee project studies the design of a future 100 km e⁺/e⁻ circular collider for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁶ cm⁻²s⁻¹. In order to reach these luminosity requirements, extreme focusing is needed in the interaction regions. For the Z energy (45.6 GeV) lattice, the maximum beta value is 8322 m, and the vertical beta function is 0.8 mm at the IP. These aspects of the FCC-ee lattice make it particularly susceptible to misalignments and field errors, and therefore present an appreciable challenge for emittance tuning. A challenging correction scheme is proposed to reduce the coupling and the vertical emittance. We describe a comprehensive correction strategy used for the low emittance tuning. The strategy includes special programs, that had been developed to optimise the lattice based on Dispersion Free Steering, linear coupling compensation based on Resonant Driving Terms and beta beat correction utilising response matrices. Thousands of misalignment and field error random seeds were introduced in MADX simulations and the final corrected lattices are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 574 EP - 577 KW - emittance KW - coupling KW - lattice KW - quadrupole KW - sextupole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB001 UR - http://jacow.org/ipac2019/papers/moprb001.pdf ER - TY - CONF AU - Lafky, M.P. AU - Atkinson, M.P. AU - Giansiracusa, P.J. AU - Hearder, L.N. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Improvements to Injector System Efficiency at the Australian Synchrotron J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - New instrumentation, software, and hardware upgrades have allowed Operations personnel to increase the overall injector system efficiency from 50% to 80% at the Australian Synchrotron. This paper will provide an overview of the methods used to achieve this result. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1378 EP - 1380 KW - linac KW - booster KW - injection KW - synchrotron KW - klystron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW001 UR - http://jacow.org/ipac2019/papers/tupgw001.pdf ER - TY - CONF AU - D'Auria, G. AU - Aicheler, M. AU - Aksoy, A.A. AU - Alesini, D. AU - Apsimon, R. AU - Arnesano, J.M. AU - Bellaveglia, M. AU - Bernhard, A. AU - Bosco, F. AU - Buonomo, B. AU - Burt, G. AU - Calvi, M. AU - Cardelli, F. AU - Castaneda Cortes, H.M. AU - Castilla, A. AU - Clarke, J.A. AU - Croia, M. AU - Cross, A.W. AU - Dattoli, G. AU - Di Mitri, S. AU - Diomede, M. AU - Dowd, R.T. AU - Dunning, D.J. AU - Fang, W.D. AU - Faus-Golfe, A. AU - Ferrario, M. AU - Ficcadenti, L. AU - Gallo, A. AU - Gazis, E.N. AU - Gazis, N. AU - Geometrante, R. AU - Gethmann, J. AU - Giribono, A. AU - Goryashko, V.A. AU - Han, Y. AU - Jacewicz, M. AU - Janssen, X.J.A. AU - Kokole, M. AU - Latina, A. AU - Liu, X. AU - Luiten, O.J. AU - Marcos, J. AU - Marín, E. AU - Mostacci, A. AU - Mutsaers, P.H.A. AU - Muñoz Horta, R. AU - Nguyen, F. AU - Palumbo, L. AU - Petralia, A. AU - Piersanti, L. AU - Priem, J.M.A. AU - Pérez, F. AU - Rochow, R.A. AU - Rossi, C. AU - Ruber, R.J.M.Y. AU - Schmidt, T. AU - Schulte, D. AU - Spataro, B. AU - Stapnes, S. AU - Stragier, X.F.D. AU - Taylor, G. AU - Thompson, N. AU - Vaccarezza, C. AU - Wu, X.W. AU - Wuensch, W. AU - Zhang, K. AU - Zhang, L. AU - Zhu, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The CompactLight Design Study Project J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The H₂020 CompactLight Project (www. CompactLight.eu) aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), the most advanced concepts for bright electron photo injectors, and innovative compact short-period undulators. Compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, and will be significantly more compact, with a smaller footprint,  as a consequence of the lower energy and the high-gradient X-band structures. In addition, the whole infrastructure will also have a lower electrical power demand as well as lower construction and running costs. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1756 EP - 1759 KW - FEL KW - linac KW - electron KW - undulator KW - brightness DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB032 UR - http://jacow.org/ipac2019/papers/tuprb032.pdf ER - TY - CONF AU - Charles, T.K. AU - Björklund Svensson, J. AU - Latina, A. AU - Thorin, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - First Experimental Measurements of the Caustic Nature of Trajectories in Bunch Compressors J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Theoretical advancements describing density perturbations in accelerated charge particle beams, known as caustics, has been recently developed * This proceeding describes the first experimental measurements of the caustic nature of charged particle trajectories in a particle accelerator. Caustics by their nature are discontinuities that result from small continuous perturbations of an input. Under certain conditions, small density modulations will reliably produce striking changes in the corresponding output current profile. These current modulations can shift alone the bunch with varying higher-order longitudinal dispersion. The MAX IV linac double-bend achromats provide the perfect test bed for experimentally verifying how the caustic lines evolve. The natural amplification of small perturbations makes caustics an attractive diagnostic tool, and effective tool for characterise the bunch compressors. This approach also allows us to modify and improve the longitudinal charge profile, removing current spikes or creating tailor shaped current profiles. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2270 EP - 2273 KW - linac KW - electron KW - FEL KW - experiment KW - sextupole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEYYPLS2 UR - http://jacow.org/ipac2019/papers/weyypls2.pdf ER - TY - CONF AU - Giansiracusa, P.J. AU - Boland, M.J. AU - Lafky, M.P. AU - Lucas, T.G. AU - Rassool, R.P. AU - Volpi, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Effect of the SLED Installation on Extracted and Lost Beam at the Australian Synchrotron Linac. J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A recent upgrade to the high power RF network of the linac at the Australian Synchrotron included a SLED Type 1 Pulse Compressor allowing for the operation of its 100 MeV linac using a single klystron. We explore the effects of the SLED installation on the properties of the beam extracted from the linac with a particular focus on the energy spread and bunch train profile. Additionally, the optical fibre beam loss monitor (oBLM), also recently commissioned, was employed to provide shot-by-shot feedback on loss location and intensity to investigate the change in beam losses. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2794 EP - 2797 KW - linac KW - synchrotron KW - network KW - klystron KW - injection DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB001 UR - http://jacow.org/ipac2019/papers/weprb001.pdf ER - TY - CONF AU - Shafqat, N. AU - Bopp, M. AU - Giannessi, L. AU - Lucas, T.G. AU - Masciovecchio, C. AU - Milloch, M. AU - Serpico, C. AU - Svandrlik, M. AU - Trovò, M. AU - Zennaro, R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Commissioning of S-band Cavity Test Facility at Elettra for Conditioning of High Gradient Structures for the Fermi Linac Upgrade J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - FERMI is the seeded Free Electron Laser (FEL) user facility at Elettra laboratory in Trieste, operating in the VUV to soft X-rays spectral range. In order to extend the FEL spectral range to shorter wavelengths, a feasibility study for increasing the Linac energy from 1.5 GeV to 1.8 GeV is actually going on. A short prototype of a new High Gradient (HG) S-band accelerating structure has been built in collaboration with Paul Scherrer Institute (PSI). The new structures are intended to replace the present Backward Travelling Wave (BTW) sections and tailored to be operated at a gradient of 30 MV/m. For RF conditioning and high power testing of prototype, a Cavity Test Facility (CTF) is commissioned at FERMI. The test facility is equipped with RF pulse compressor system and a dedicated diagnostic for breakdown rate (BDR) measurements and events localization. In this paper we present in detail cavity test facility of FERMI and high power testing of the first prototype. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2846 EP - 2848 KW - cavity KW - LLRF KW - FEL KW - hardware KW - linac DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB021 UR - http://jacow.org/ipac2019/papers/weprb021.pdf ER - TY - CONF AU - Banon-Caballero, D. AU - Boronat, M. AU - Catalán Lasheras, N. AU - Faus-Golfe, A. AU - Gimeno, B. AU - Lucas, T.G. AU - Millar, W.L. AU - Paszkiewicz, J. AU - Pitman, S. AU - Sánchez Sebastián, V. AU - Vnuchenko, A. AU - Volpi, M. AU - Widorski, M. AU - Wuensch, W. AU - del Pozo Romano, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Dark Current Analysis at CERN’s X-band Facility J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. In this paper, an analysis of dark current is presented for four accelerating structures that were tested and conditioned in CERN’s X-band test facility for CLIC. The dependence on power, and therefore on accelerating gradient, of the dark current signals is presented. The Fowler-Nordheim equation for field emission seems to be in accordance with the experimental data. Moreover, the analysis shows that the current intensity decreases as a function of time due to conditioning, but discrete jumps in the dark current signals are present, probably caused by breakdown events that change the emitters’ location and intensity. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2944 EP - 2947 KW - radiation KW - operation KW - electron KW - ECR KW - linac DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB059 UR - http://jacow.org/ipac2019/papers/weprb059.pdf ER - TY - CONF AU - del Pozo Romano, V. AU - Bursali, H. AU - Catalán Lasheras, N. AU - Grudiev, A. AU - Pitman, S. AU - Serpico, C. AU - Syratchev, I. AU - Volpi, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - High Power Conditioning of X-Band Variable Power Splitter and Phase Shifter J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The three X-band test facilities currently at CERN aim at qualifying CLIC structures prototypes but are also exten- sively used to qualify X-band components operation at high power. In order to upgrade one of the facilities from a single test line to a double test line facility, a high power variable splitter and variable phase shifter have been designed and manufactured at CERN. They have been power tested, first in a dedicated test and also in their final configuration, to en- sure stable power operation before installing them together with an accelerating structure. In this paper, we broadly describe the RF and mechanical design, manufacturing and low power measurements agreement with simulations. We report the high power qualification of both components and their suitability to be used in existing and planned X-band facilities. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2964 EP - 2967 KW - simulation KW - klystron KW - GUI KW - ISOL KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB064 UR - http://jacow.org/ipac2019/papers/weprb064.pdf ER -