TY - CONF AU - Santamaría García, A. AU - Albright, S.C.P. AU - Antoniou, F. AU - Asvesta, F. AU - Bartosik, H. AU - Di Giovanni, G.P. AU - Mikulec, B. AU - Rafique, H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Identification and Compensation of Betatronic Resonances in the Proton Synchrotron Booster at 160 Mev J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Proton Synchrotron Booster (PSB) is the first circular accelerator in the injector chain to the Large Hadron Collider (LHC) and accelerates protons from 50 MeV to 1.4 GeV. The PSB will need to deliver two times the current brightness after the LHC Injectors Upgrade (LIU) in order to meet the High Luminosity LHC (HL-LHC) beam requirements. At the current injection energy a large incoherent space charge tune spread limits the brightness of the beams, which is one of the main motivations to increase the injection energy to 160 MeV with the injection provided by Linac4, a new H⁻ linear accelerator. The higher injection energy will allow doubling the beam intensity while maintaining a space charge tune spread similar to current values. The degradation of the beam brightness due to the tune spread can be minimized with a proper choice of working point and an efficient compensation of resonances. In this paper, we present the measurement of the betatronic resonances in the four rings of the PSB at 160 MeV before the Long Shutdown 2, as well as the results of a proposed compensation scheme. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1054 EP - 1057 KW - resonance KW - space-charge KW - injection KW - proton KW - emittance DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS086 UR - http://jacow.org/ipac2019/papers/mopts086.pdf ER - TY - CONF AU - Antoniou, F. AU - Albright, S.C.P. AU - Asvesta, F. AU - Bartosik, H. AU - Di Giovanni, G.P. AU - Forte, V. AU - Fraser, M.A. AU - Garcia-Tabares, A. AU - Huschauer, A. AU - Mikulec, B. AU - Prebibaj, T. AU - Santamaría García, A. AU - Skowroński, P.K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Transverse Emittance Studies at Extraction of the CERN PS Booster J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Transverse emittance discrepancy in the beam transfer between the Proton Synchrotron Booster (PSB) and the Proton Synchrotron (PS) is observed in operational conditions for the LHC beams at CERN. The ongoing LHC Injectors Upgrade (LIU) project requires a tight budget for beam degradation along the injector chain and therefore the reason for this emittance discrepancy needs to be understood. Systematic measurements have been performed for various beam characteristics (beam intensity, transverse and longitudinal emittance). In this paper, a comparison between the emittance measurements using all available beam instrumentation with different emittance computation algorithms is presented. The results are compared to measurements at PS injection. Furthermore, the impact on the LIU project requirements for the emittance preservation along the LHC Injectors Complex is discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1058 EP - 1061 KW - emittance KW - optics KW - operation KW - booster KW - injection DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS087 UR - http://jacow.org/ipac2019/papers/mopts087.pdf ER - TY - CONF AU - Asvesta, F. AU - Antoniou, F. AU - Bartosik, H. AU - Di Giovanni, G.P. AU - Papaphilippou, Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Coupling and Space Charge Studies at the CERN PSB J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the nominal optics of the CERN PS-Booster (PSB), the fourth order coupling resonance is excited by space charge (Montague resonance) due to the same integer tune values. This resonance can be avoided by changing the tunes to different integers. A new PSB optics is presented and emittance measurements crossing the coupling resonance for the nominal and the new optics are shown. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3192 EP - 3195 KW - resonance KW - optics KW - coupling KW - emittance KW - space-charge DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS041 UR - http://jacow.org/ipac2019/papers/wepts041.pdf ER - TY - CONF AU - Asvesta, F. AU - Bartosik, H. AU - Huschauer, A. AU - Papaphilippou, Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Space Charge Driven Resonances in the CERN PS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the CERN Proton Synchrotron space charge driven resonances are excited around the operational working point due to the periodicity of the optics functions. In this paper, the resonances are studied using analytical methods, i.e. the evaluation of the resonance driving terms connected to the space charge potential of Gaussian distributions. Furthermore, the resonances are characterized in measurements and simulations for various beams. The beams considered are different in terms of brightness, in order to study the dependence of the resonance strength on the space charge force. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3216 EP - 3219 KW - resonance KW - space-charge KW - brightness KW - simulation KW - lattice DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS047 UR - http://jacow.org/ipac2019/papers/wepts047.pdf ER -