TY - CONF AU - Biagini, M.E. AU - Antonelli, M. AU - Bacci, A. AU - Bauce, M. AU - Blanco-García, O.R. AU - Boscolo, M. AU - Cesarini, G. AU - Chaikovska, I. AU - Chehab, R. AU - Ciarma, A. AU - Collamati, F. AU - Giribono, A. AU - Guiducci, S. AU - Liuzzo, S.M. AU - Lucchesi, D. AU - Pastrone, N. AU - Raimondi, P. AU - Vaccarezza, C. AU - Variola, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Positron Driven Muon Source for a Muon Collider: Recent Developments J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. The Low Emittance Muon Accelerator (LEMMA) concept *,** presents in this paper an upgraded layout of a positron driven muon source. The positron beam, stored in a ring with high energy acceptance and low emittance, is extracted and driven in a push-pull configuration to a multi-target system, to produce muon pairs at threshold on the target’s electrons. This solution alleviates the issues related to the power deposited and the integrated Peak Energy Density Deposition on the targets. Muons produced in the multi-target system will then be accumulated in many parallel rings before acceleration and injection in the collider. A special multi-target line lattice has been designed to cope with the focusing of both the positron and muon beams. Studies on the number, material and thickness of the targets have been carried out. A general layout of the overall scheme and a description is presented, as well as plans for future R&D. PB - JACoW Publishing CP - Geneva, Switzerland SP - 49 EP - 52 KW - target KW - emittance KW - damping KW - collider KW - positron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOZZPLS2 UR - http://jacow.org/ipac2019/papers/mozzpls2.pdf ER - TY - CONF AU - White, S.M. AU - Carmignani, N. AU - Dubrulle, M. AU - Morati, M. AU - Raimondi, P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Transparent Injection for ESRF-EBS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The commissioning of the ESRF-EBS storage ring will start in December 2019 ultimately providing a horizontal emittance of 130 pm, 30 times lower than the present one. Due to the reduced beam lifetime top-up operation will be required for all operating modes. Transparent injection, i.e. with negligible perturbations on the stored beam, is necessary to allow continuous data acquisition for beam lines experiments. Several options have been considered at ESRF to reduce these perturbations down to a fraction of the rms beam size: i) new kickers power supplies with slow ramping time to facilitate active compensation are under development and will be implemented in the coming years ii) in parallel, long term solutions using non-linear kickers and longitudinal on-axis injection have been investigated. PB - JACoW Publishing CP - Geneva, Switzerland SP - 78 EP - 81 KW - injection KW - kicker KW - SRF KW - sextupole KW - power-supply DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW008 UR - http://jacow.org/ipac2019/papers/mopgw008.pdf ER - TY - CONF AU - Blanco-García, O.R. AU - Antonelli, M. AU - Biagini, M.E. AU - Boscolo, M. AU - Cesarini, G. AU - Ciarma, A. AU - Collamati, F. AU - Guiducci, S. AU - Li Voti, R. AU - Raimondi, P. AU - Vaccarezza, C. AU - Variola, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Multi-Target Lattice for Muon Production From e⁺ Beam Annihilation on Target J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Low Emittance Muon Accelerator~(LEMMA) aims at producing small emittance muons from positron annihilation with electrons in a target. Given the low cross section of the production process, a large number of positrons on the target are required, exposing it to high power deposition and the beam to large degradation because of multiple scattering and bremstrahlung. A multi-target IP, and multi-IP line has been studied to reduce the power deposition per target and the degradation of the positron beam while preserving the number of muon pairs produced. The lattice copes with the focusing and transport of three beams at two different energies, the positron beam at 45 GeV, and µ⁺+ and µ⁻ beams at 22.5~GeV. Studies on the beam dynamics, number of targets, material and thickness of the targets are reported in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 578 EP - 581 KW - target KW - positron KW - emittance KW - lattice KW - site DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB003 UR - http://jacow.org/ipac2019/papers/moprb003.pdf ER - TY - CONF AU - Liuzzo, S.M. AU - Carmignani, N. AU - Franchi, A. AU - Perron, T.P. AU - Scheidt, K.B. AU - Taurel, E.T. AU - Torino, L. AU - White, S.M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Preparation of the EBS Beam Commissioning J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In 2020 the ESRF storage ring will be upgraded to a Hybrid Multi Bend Achromat (HMBA) lattice. The commissioning of the new ring will require dedicated tools, either updated from the existing ones or newly developed. Most of the software and procedures were tested on the existing storage ring before its decommissioning. In particular we present experiments on first-turn steering and beam accumulation, check of magnet polarity and calibration, and injection tuning. The use of a control-system simulator proved to be crucial for the debugging of the software and the development of the new control system, as far as beam measurements and manipulations are concerned. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1388 EP - 1391 KW - SRF KW - MMI KW - storage-ring KW - controls KW - injection DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW005 UR - http://jacow.org/ipac2019/papers/tupgw005.pdf ER - TY - CONF AU - Carmignani, N. AU - De Nolf, W. AU - Franchi, A. AU - Nash, B. AU - Sahle, C. AU - Torino, L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Measurements of the Momentum Compaction Factor of the ESRF Storage Ring J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In a storage ring, the momentum compaction factor can be obtained by measuring the variation of the beam energy as a function of the RF frequency. In this paper we present the measurement of the momentum compaction factor from two different methods. With the first, we measure the variation of the undulator spectra for different RF frequencies. With the second, we measure the variation of the hard x-rays flux produced by a dipole for different RF frequencies. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1392 EP - 1395 KW - radiation KW - undulator KW - electron KW - SRF KW - synchrotron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW006 UR - http://jacow.org/ipac2019/papers/tupgw006.pdf ER - TY - CONF AU - Revol, J.-L. AU - Farvacque, L. AU - Hardy, L. AU - Raimondi, P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - THE ESRF FROM 1988 TO 2018, 30 YEARS OF INNOVATION AND OPERATION J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In 1988, eleven European countries joined forces to build the European Synchrotron Facility in Grenoble [France]. The ESRF was the first third-generation light source worldwide. After 30 years of innovation and user operation, the present storage ring was shut down to leave room for a new and brighter source. This paper describes the evolution of the facility from its origin to the Ex-tremely Bright Source (EBS). Firstly, the operational aspects including reliability and beam modes are consid-ered. This is followed by the presentation of the progress of lattice and the implementation of top-up. Finally, the development of the radio frequency and vacuum systems are discussed. To conclude, the lessons learned from 30 years operation are summarized, especially in view of EBS. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1400 EP - 1403 KW - operation KW - SRF KW - vacuum KW - injection KW - emittance DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW009 UR - http://jacow.org/ipac2019/papers/tupgw009.pdf ER - TY - CONF AU - Dehler, M.M. AU - Alberti, S. AU - Citterio, A. AU - Hahn, M. AU - Hogge, J.P. AU - Liu, X.Y. AU - Marques, H.P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Characterization of NEG Coatings for SLS 2.0 J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - To limit desorption and ameliorate pumping of the narrow 20 mm aperture vacuum chamber of SLS2.0, it is planned to fully coat it with nonevaporable getter (NEG) material. NEG coating can be produced with different structural characteristics, from dense films to columnar growth, with corresponding distinct electrical properties affecting the machine impedance and the instability threshold of the accelerator. In order to evaluate and characterize the coating process for geometries similar to the SLS chamber, we measured the resonance properties of coated and uncoated shorted waveguide pieces. First tests were done with standard X band waveguides at 12 and 7 GHz. Test setups using elliptical cross sections are in preparation, also for higher frequencies allowing the characterization of thin NEG layers. The final goal is to have a standardized process to test of samples coated by external producers. We describe the setups and first results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1662 EP - 1665 KW - GUI KW - impedance KW - resonance KW - coupling KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW108 UR - http://jacow.org/ipac2019/papers/tupgw108.pdf ER - TY - CONF AU - Salvant, B. AU - Amorim, D. AU - Antipov, S.A. AU - Arsenyev, S. AU - Beck, M.S. AU - Biancacci, N. AU - Brüning, O.S. AU - Campelo, J.V. AU - Carideo, E. AU - Caspers, F. AU - Dalascu, T. AU - Farricker, A. AU - Grudiev, A. AU - Kaltenbacher, T. AU - Koukovini-Platia, E. AU - Kramer, P. AU - Lasheen, A. AU - Migliorati, M. AU - Mounet, N. AU - Métral, E. AU - Nagaoka, R. AU - Nasr Esfahani, N. AU - Persichelli, S. AU - Popovic, B.K. AU - Rijoff, T.L. AU - Rumolo, G. AU - Shaposhnikova, E.N. AU - Smaluk, V.V. AU - Spataro, B. AU - Vaccaro, V.G. AU - Vollinger, C. AU - Wang, N. AU - White, S.M. AU - Zannini, C. AU - Zotter, B. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Building the Impedance Model of a Real Machine J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A reliable impedance model of a particle accelerator can be built by combining the beam coupling impedances of all the components. This is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics nonlinearities, transverse damper, noise, space charge, electron cloud, beam-beam (in a collider). The main phases to create a realistic impedance model, and verify it experimentally, will be reviewed, highlighting the main challenges. Some examples will be presented revealing the levels of precision of machine impedance models that have been achieved. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2249 EP - 2254 KW - impedance KW - simulation KW - wakefield KW - coupling KW - cavity DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEYPLS1 UR - http://jacow.org/ipac2019/papers/weypls1.pdf ER -