Professor Adrian Oeftiger: Publications

Space charge mitigation with longitudinally hollow bunches

HB 2016 - Proceedings of the 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams (2016) 130-135

Authors:

A Oeftiger, S Hancock, G Rumolo

Abstract:

Hollow longitudinal phase space distributions have a flat profile and hence reduce the impact of transverse space charge. Dipolar parametric excitation with the phase loop feedback systems provides such hollow distributions under reproducible conditions. We present a procedure to create hollow bunches during the acceleration ramp of CERN’s PS Booster machine with minimal changes to the operational cycle. The improvements during the injection plateau of the downstream Proton Synchrotron are assessed in comparison to standard parabolic bunches.

Space charge modules for pyheadtail

HB 2016 - Proceedings of the 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams (2016) 124-129

Authors:

A Oeftiger, S Hegglin

Abstract:

PyHEADTAIL is a 6D tracking tool developed at CERN to simulate collective effects. We present recent developments of the direct space charge suite, which is available for both the CPU and GPU. A new 3D particle-in-cell solver with open boundary conditions has been implemented. For the transverse plane, there is a semi-analytical Bassetti-Erskine model as well as 2D self-consistent particle-in-cell solvers with both open and closed boundary conditions. For the longitudinal plane, PyHEADTAIL offers line density derivative models. Simulations with these models are bench-marked with experiments at the injection plateau of CERN’s Super Proton Synchrotron.

Flat Bunches with a Hollow Distribution for Space Charge Mitigation

ArXiv 1605.01616 (2016)

Authors:

Adrian Oeftiger, Hannes Bartosik, Alan James Findlay, Steven Hancock, Giovanni Rumolo

Beam Instabilities in Hadron Synchrotrons

IEEE Transactions on Nuclear Science Institute of Electrical and Electronics Engineers (IEEE) 63:2 (2016) 1001-1050

Authors:

E Métral, T Argyropoulos, H Bartosik, N Biancacci, X Buffat, JF Esteban Muller, W Herr, G Iadarola, A Lasheen, K Li, A Oeftiger, T Pieloni, D Quartullo, G Rumolo, B Salvant, M Schenk, E Shaposhnikova, C Tambasco, H Timko, C Zannini, A Burov, D Banfi, J Barranco, N Mounet, O Boine-Frankenheim, U Niedermayer, V Kornilov, S White

Flat bunches with a hollow distribution for space charge mitigation

IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference (2016) 652-655

Authors:

A Oeftiger, H Bartosik, A Findlay, S Hancock, G Rumolo

Abstract:

Longitudinally hollow bunches provide one means to mitigate the impact of transverse space charge. The hollow distributions are created via dipolar parametric excitation during acceleration in CERN's Proton Synchrotron Booster. We present simulation work and beam measurements. Particular emphasis is given to the alleviation of space charge effects on the long injection plateau of the downstream Proton Synchrotron machine, which is the main goal of this study.

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