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RIS citation export for THBP15: Optimizing Resonance Driving Terms Using MAD-NG Parametric Maps

TY  - CONF
AU  - Deniau, L.
AU  - Kostoglou, S.
AU  - Maclean, E.H.
AU  - Paraschou, K.
AU  - Persson, T.H.B.
AU  - Tomás García, R.
ED  - Cai, Yunhai
ED  - Nagaitsev, Sergei
ED  - Kim, Dong Eon
ED  - Marx, Michaela
ED  - Schaa, Volker R. W.
TI  - Optimizing Resonance Driving Terms Using MAD-NG Parametric Maps
J2  - Proc. of HB2023, Geneva, Switzerland, 09-13 October 2023
CY  - Geneva, Switzerland
T2  - ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams
T3  - 68
LA  - english
AB  - In 2023, a review of the LHC octupolar resonance driving terms at injection was carried out, motivated by two observations: (i) unwanted losses during the injection process with strongly powered octupoles and (ii) an expected reduction in emittance growth from e-cloud effects in simulations with weaker octupolar resonances. The MAD-NG code was used to simultaneously optimise the main octupolar resonances: 4Qx, 4Qy, and 2Qx-2Qy by adjusting 16 quadrupole families and 16 octupole families, for a total of 32 parameters. These knobs were introduced as parameters in the transfer map, allowing the Jacobian required by the optimiser to be calculated in a single pass, saving 32 additional optics evaluations and avoiding finite difference approximations. Constraints on tunes, amplitude detuning and optics around the machine were also considered as part of the optimisation process. This paper reviews the parametric optimisation with MAD-NG and compares the results with MADX-PTC.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 483
EP  - 486
KW  - optics
KW  - resonance
KW  - injection
KW  - octupole
KW  - emittance
DA  - 2024/04
PY  - 2024
SN  - 2673-5571
SN  - 978-3-95450-253-0
DO  - doi:10.18429/JACoW-HB2023-THBP15
UR  - https://jacow.org/hb2023/papers/thbp15.pdf
ER  -