Investigation of the Remanent Field of the SPS Main Dipoles and Possible Solutions for Machine Operation

Velotti, Francesco; Bartosik, Hannes; Bauche, Jeremie; Buzio, Marco; Cornelis, Karel; Fraser, Matthew; Kain, Verena

doi:10.18429/JACoW-IPAC2017-THPAB146

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RIS citation export for THPAB146: Investigation of the Remanent Field of the SPS Main Dipoles and Possible Solutions for Machine Operation

TY - CONF
AU - Velotti, F.M.
AU - Bartosik, H.
AU - Bauche, J.
AU - Buzio, M.C.L.
AU - Cornelis, K.
AU - Fraser, M.A.
AU - Kain, V.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Investigation of the Remanent Field of the SPS Main Dipoles and Possible Solutions for Machine Operation
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - The CERN Super Proton Synchrotron (SPS) provides different types of beams at different extraction energies. The main magnets of the SPS are regulated with a current loop, but it has turned out that hysteresis effects from the main dipoles have a significant impact on reproducibility and hence efficiency and availability. Beam and machine parameters were found to depend on the programmed sequence of magnetic cycles - the so-called super cycle - representing the production of the different beams. The scientific program of the SPS requires frequent changes of the supercycle composition and the effect of the main magnet hysteresis has to be understood, modelled and used in accelerator control system. This paper summarises the first main field measurements carried out with the currently available systems during operational conditions as well as measurements of vital machine and beam parameters as a function of the super cycle composition. Finally, ideas will be presented to provide reproducibility by automatically correcting different parameters taking the magnetic history of the main magnets into account.
PB - JACoW
CP - Geneva, Switzerland
SP - 4069
EP - 4072
KW - dipole
KW - closed-orbit
KW - operation
KW - extraction
KW - proton
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-THPAB146
UR - http://jacow.org/ipac2017/papers/thpab146.pdf
ER -