TY  - CONF
AU  - Esposito, L.S.
AU  - Addesa, F.M.
AU  - Afonin, A.G.
AU  - Bestman, P.
AU  - Borg, J.E.
AU  - Butcher, M.E.J.
AU  - Calviani, M.
AU  - Chesnokov, Y.A.
AU  - Denisov, A.S.
AU  - Di Castro, M.
AU  - Donzé, M.
AU  - Durum, A.A.
AU  - Fraser, M.A.
AU  - Galluccio, F.
AU  - Garattini, M.
AU  - Gavrikov, Y.
AU  - Gilardoni, S.S.
AU  - Goddard, B.
AU  - Hall, G.
AU  - Iacoangeli, F.
AU  - Ivanov, Yu.M.
AU  - James, T.
AU  - Kain, V.
AU  - Kovalenko, A.D.
AU  - Koznov, M.A.
AU  - Lendaro, J.
AU  - Maisheev, V.A.
AU  - Malyarenko, L.G.
AU  - Masi, A.
AU  - Murtas, F.
AU  - Natochii, A.
AU  - Pari, M.
AU  - Pesaresi, M.
AU  - Prieto, J.
AU  - Rossi, R.
AU  - Sandomirskiy, Yu.E.
AU  - Scandale, W.
AU  - Seidenbinder, R.
AU  - Serrano Galvez, P.
AU  - Skorobogatov, V.
AU  - Stoel, L.S.
AU  - Taratin, A.M.
AU  - Velotti, F.M.
AU  - Yanovich, A.A.
AU  - Zhovkovska, V.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Crystal for Slow Extraction Loss-Reduction of the SPS Electrostatic Septum
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The use of a bent crystal was investigated in order to reduce the losses at the CERN Super Proton Synchrotron (SPS) electrostatic septa (ZS) during the slow extraction of 400 GeV protons toward the North Area. The crystal, installed a few meters upstream the ZS, bends protons that would otherwise impinge on the ZS wires. Since particle deflection with good efficiency is achieved only when the crystal lattice is aligned within ~10 urad to the trajectory of the particles (at p = 400 GeV/c), a compact goniometer was built to allow the correct angular alignment of the crystal with respect to the incoming beam with a precision of few urad. In this paper, we report on the crystal features measured during a dedicated beam test by the UA9 experimental installation in the CERN H8 beam line. Details of the goniometer and its installation are also reported. The first results achieved during dedicated Machine Development (MD) sessions are finally presented.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2379
EP  - 2382
KW  - extraction
KW  - proton
KW  - experiment
KW  - ECR
KW  - alignment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPMP028
UR  - http://jacow.org/ipac2019/papers/wepmp028.pdf
ER  - 

TY  - CONF
AU  - Velotti, F.M.
AU  - Addesa, F.M.
AU  - Afonin, A.G.
AU  - Bestmann, P.
AU  - Borg, J.E.
AU  - Butcher, M.E.J.
AU  - Calviani, M.
AU  - Chesnokov, Y.A.
AU  - Denisov, A.S.
AU  - Di Castro, M.
AU  - Donzé, M.
AU  - Durum, A.A.
AU  - Esposito, L.S.
AU  - Fraser, M.A.
AU  - Galluccio, F.
AU  - Garattini, M.
AU  - Gavrikov, Y.
AU  - Gilardoni, S.S.
AU  - Goddard, B.
AU  - Hall, G.
AU  - Iacoangeli, F.
AU  - Ivanov, Yu.M.
AU  - James, T.
AU  - Kain, V.
AU  - Koznov, M.A.
AU  - Lendaro, J.
AU  - Maisheev, V.A.
AU  - Malyarenko, L.G.
AU  - Masi, A.
AU  - Mirarchi, D.
AU  - Murtas, F.
AU  - Pari, M.
AU  - Pesaresi, M.
AU  - Prieto, J.
AU  - Redaelli, S.
AU  - Rossi, R.
AU  - Sandomirskiy, Yu.E.
AU  - Scandale, W.
AU  - Seidenbinder, R.
AU  - Serrano Galvez, P.
AU  - Skorobogatov, V.
AU  - Stoel, L.S.
AU  - Yanovich, A.A.
AU  - Zamantzas, C.
AU  - Zhovkovska, V.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Demonstration of Loss Reduction Using a Thin Bent Crystal to Shadow an Electrostatic Septum During Resonant Slow Extraction
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - A proof-of-principle experiment demonstrating the feasibility of using a thin, bent crystal aligned upstream of an extraction septum (ES) to increase the efficiency of the third-integer resonant slow extraction process has been carried out at the CERN Super Proton Synchrotron (SPS). With the primary aim of reducing the beam loss and induced radio-activation of the SPS, the crystal was aligned to both the beam and the septum to reduce by up to 40% the beam intensity impinging the ES and increase the intensity entering the external transfer line. In this contribution, we introduce the concept and the prototype system that was installed in 2018 before reporting in detail on the dedicated program of machine development studies carried out to characterise its performance and demonstrate operational feasibility. The performance reach and compatibility with other loss reduction techniques proposed to further increase the extraction efficiency, such as phase space folding with octupoles, is discussed in view of future high intensity operation.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3399
EP  - 3403
KW  - extraction
KW  - operation
KW  - septum
KW  - optics
KW  - experiment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THXXPLM2
UR  - http://jacow.org/ipac2019/papers/thxxplm2.pdf
ER  -