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TY - CONF AU - Shaposhnikova, E.N. AU - Argyropoulos, T. AU - Bohl, T. AU - Cruikshank, P. AU - Goddard, B. AU - Kaltenbacher, T. AU - Lasheen, A. AU - Perez Espinos, J. AU - Repond, J. AU - Salvant, B. AU - Vollinger, C. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Removing Known SPS Intensity Limitations for High Luminosity LHC Goals J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - In preparation of the SPS as an LHC injector its impedance was significantly reduced in 1999 - 2000. A new SPS impedance reduction campaign is planned now for the High Luminosity (HL)-LHC project, which requires bunch intensities twice as high as the nominal one. One of the known intensity limitations is a longitudinal multi-bunch instability with a threshold 3 times below this operational intensity. The instability is presently cured using the 4th harmonic RF system and controlled emittance blow-up, but reaching the HL-LHC parameters cannot be assured without improving the machine impedance. Recently the impedance sources responsible for this instability were identified and implementation of their shielding and damping is foreseen during the next long shutdown (2019 - 2020) in synergy with two other important upgrades: amorphous carbon coating of (part of) the vacuum chamber against the e-cloud effect and rearrangement of the 200 MHz RF system. In this paper the strategy of impedance reduction is presented together with beam intensity achievable after its realisation. The potential effect of other proposals on remaining limitations is also considered. PB - JACoW CP - Geneva, Switzerland SP - 989 EP - 991 KW - impedance KW - vacuum KW - simulation KW - emittance KW - shielding DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-MOPOY058 UR - http://jacow.org/ipac2016/papers/mopoy058.pdf ER -