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Beam Loading in a Proton Driven Plasma Wakefield Accelerator

Olsen, Veronica Kristine Berglyd
Doctoral thesis
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PhD--Berglyd-Olsen--2019.pdf (11.83Mb)
Year
2019
Permanent link
http://urn.nb.no/URN:NBN:no-70049

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  • Fysisk institutt [2944]
Abstract
The Advanced Wakefield Experiment (AWAKE) at CERN is the first plasma wakefield experiment to exploit the self-modulation instability in a long proton bunch in order to accelerate electrons to high energies. The first run saw electrons accelerated from 19 MeV to 2 GeV in just 10 metres of ionised Rubidium vapour, achieving a gradient of nearly 200 MV/m.

A challenge facing such accelerator designs is the final quality of the accelerated bunch. Retaining a low spread in energy and emittance, while achieving a high accelerating gradient, are goals that to an extent are in conflict.

This thesis shows, using computer simulations, that it is possible to accelerate 30–70 pC of electrons up to 1.8–2 GeV in a 4 metre plasma stage, with an energy spread of less than 2 percent, and with no significant emittance growth.

Low energy spread is achieved by finely tuning the witness bunch size and density to fit the plasma parameters as well as the wakefields generated by the drive bunch. Low emittance growth is achieved by exploiting the wake generated by the head of the witness bunch to create a stable condition for its tail. This provides a potential experiment setup for the next stage of AWAKE.
List of papers
Paper I: Loading of a Plasma-Wakefield Accelerator Section Driven by a Self-Modulated Proton Bunch. V. K. Berglyd Olsen, E. Adli, P. Muggli, L. D. Amorim, J. M. Vieira. Proceedings of IPAC 2015, Richmond, Virginia, USA. ISBN 978-3-95450-168-7. The paper is included in the thesis.
Paper II: Loading of Wakefields in a Plasma Accelerator Section Driven by a Self-Modulated Proton Beam. Veronica K. Berglyd Olsen, Erik Adli , Patric Muggli, Jorge M. Vieira. Proceedings of NAPAC 2016. ISBN 978-3-95450-180-9. The paper is included in the thesis.
Paper III: Data Acquisition and Controls Integration of the AWAKE Experiment at CERN. Veronica K. Berglyd Olsen, Spencer J. Gessner, Jozef J. Batkiewicz, Stephane Deghaye, Edda Gschwendtner, Patric Muggli. Proceedings of IPAC 2017, Copenhagen, Denmark. ISBN 978-3-95450-182-3. The paper is included in the thesis.
Paper IV: Emittance Preservation of an Electron Beam in a Loaded Quasilinear Plasma Wakefield. Veronica K. Berglyd Olsen, Erik Adli, Patric Muggli. Physical Review Accelerators and Beams, 2018, 21, 011301. DOI: 10.1103/PhysRevAccelBeams.21.011301. The paper is included in the thesis. Also available in DUO: http://urn.nb.no/URN:NBN:no-68429
 
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