guest ::
| Home > Publications database > Demonstration of High Energy-Transfer Efficiency for Quality-Preserving, Beam-Driven Plasma-Wakefield Accelerators |
| Home > Publications database > Demonstration of High Energy-Transfer Efficiency for Quality-Preserving, Beam-Driven Plasma-Wakefield Accelerators |
| Dissertation / PhD Thesis | PUBDB-2025-01278 |
; ;
2024
This record in other databases:
Please use a persistent id in citations: urn:nbn:de:gbv:18-ediss-119070 doi:10.3204/PUBDB-2025-01278
Abstract: With the advancement of climate change, greenhouse gas emissions in all aspects of society must be reduced, including research. Particle collider and free-electron laser (FEL) facilities have become increasingly large as their scientific reach has been extended by using higher-energetic particles. While they have proven indispensable in fundamental research and industry and have impelled technological advances, they also have a large environmental footprint.Plasma accelerators, which accelerate particle bunches in the wakefields of a charged bunch propagating through a plasma, can sustain orders-of-magnitude-greater accelerating gradients than state-of-the-art accelerators. This would shrink the size of collider and FEL facilities, reducing their construction-arising environmental footprint and costs. However, a large fraction of the carbon footprint across the lifetime of such high-beam-power machines comes from power consumption during operation. Plasma accelerators must operate at high energy-transfer efficiency to ensure that the benefits of a smaller facility are not rendered futile by excessive power consumption. This thesis treats the topic of energy efficiency in plasma accelerators, presenting experimental results with high energy efficiency in the two transfers occurring within the plasma: from the driving bunch to the plasma and from the plama to the accelerating bunch. However, these types of facilities require high-quality bunches. Therefore, the experimental results must also be relevant for quality-preserving acceleration.Measuring high-quality bunches and a high energy-transfer efficiency requires precise diagnostics, for which a detailed dipole spectrometer calibration is performed. This allowed demonstrating experimentally the acceleration of a particle bunch at 0.8 GV/m while preserving its energy spread, charge, and transverse emittance. The plasma-to-accelerating-bunch energy-transfer efficiency in this first quality-preserving working point is 22%, close to the literature’s record efficiencies.The main result of this thesis is the experimental demonstration of (59 ± 3)% driver-to-plasma energy-transfer efficiency – an order of magnitude larger than previous results in the literature. This result was achieved at the limit of re-acceleration, a process that would hinder preserving the quality of an accelerating bunch, where the first driver electrons become non-relativistic, slip backward in phase and get re-accelerated. For the first time, this process, which limits the energy efficiency of a plasma accelerator, is measured in detail and with two separate diagnostics.While the high efficiency of these results was achieved separately, they represent key milestones in demonstrating high-efficiency and quality-preserving plasma accelerators.
; 
|
The record appears in these collections: |
PDF
PDF (PDFA)