Scheuren, Stefan (2024)
Comprehensive characterization of laser-driven neutron sources and a pathway towards miniaturization.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00028656
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Comprehensive characterization of laser-driven neutron sources and a pathway towards miniaturization | ||||
Language: | English | ||||
Referees: | Roth, Prof. Dr. Markus ; Kuschel, Prof. Dr. Stephan | ||||
Date: | 22 November 2024 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | xii, 152 Seiten | ||||
Date of oral examination: | 14 October 2024 | ||||
DOI: | 10.26083/tuprints-00028656 | ||||
Abstract: | Over the past decade, laser-driven neutron sources (LDNS) have garnered much interest as a compact, cost-efficient alternative to established neutron sources. During this time, the field of laser-driven neutron sources has progressed from early investigations focusing on the characteristics of the generated neutron field to the first proof-of-principle demonstration of applications. This work presents a comprehensive characterization of a LDNS intended to be used as a blueprint for future experiments and the eventual design of a laser-based neutron facility. The characterization is based on in-depth Monte Carlo simulations that are compared and validated by experimental measurements. The Monte Carlo simulations allow for investigation into the constituents that make up the neutron fluence at the position of the detectors. Furthermore, the contribution of neutron scattering and the neutron resolution function for the detectors used during the experimental campaign are determined. In this way, it could be demonstrated that up to 25 % of the neutrons at the detector position originate outside the catcher and that up to 90 % of the neutrons are affected by scattering. This thesis also demonstrated the viability of thermal neutron resonance imaging at LDNS in a proof-of-principle experiment. During the experiment, the energy-dependent attenuation of a Cd sample was measured, allowing for the determination of its position in the neutron image. A concept for driving highly efficient LDNS based on laser-accelerated electron beams is also presented. These sources hold much promise as compact, laboratory-scale LDNS. It could be demonstrated that electronbased sources should perform much better than ion-based sources for low laser pulse energies. Finally, a new method for analyzing and calculating neutron fluences from bubble detector measurements was developed. The method was used to analyze the data recorded during the characterization campaign, and the results from the Monte Carlo simulations showed good agreement. Compared to previously used methods, the neutron fluences calculated by the new method are up to 55 % lower than those calculated from previously used methods. |
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Uncontrolled Keywords: | Laser-Driven Neutron Sources, Neutronen, Monte Carlo Simulation, Laser Particle Acceleration | ||||
Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-286565 | ||||
Classification DDC: | 500 Science and mathematics > 530 Physics | ||||
Divisions: | 05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Laser- und Plasmaphysik | ||||
Date Deposited: | 22 Nov 2024 10:08 | ||||
Last Modified: | 25 Nov 2024 07:26 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/28656 | ||||
PPN: | 524052948 | ||||
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