New design and simulation of the ion guide for neutron-induced fission products at the IGISOL facility
Gao, Z., Solders, A., Al-Adili, A., Cannarozzo, S., Lantz, M., Penttilä, H., & Pomp, S. (2023). New design and simulation of the ion guide for neutron-induced fission products at the IGISOL facility. In C. M. Mattoon, R. Vogt, J. Escher, & I. Thompson (Eds.), ND 2022 : 15th International Conference on Nuclear Data for Science and Technology (284, Article 04011). EDP Sciences. EPJ Web of Conferences. https://doi.org/10.1051/epjconf/202328404011
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2023Copyright
© The Authors, published by EDP Sciences.
Measurements of independent fission yield distributions in neutron-induced fission at high neutron energies are important for our fundamental understanding of the fission process, and are also relevant for reactor physics applications. So far, measurements of independent fission yields in proton-induced fission have been performed at the IGISOL facility at the University of Jyväskylä, using the Penning trap as a high resolving-power mass-filter. In order to also facilitate measurements of neutron-induced fission, a dedicated ion guide and a proton-to-neutron converter was developed. However, the first measurement indicates that fewer fission products than expected reach the Penning trap. To explore potential reasons and possible improvements, a simulation model was also developed and benchmarked. The benchmark showed that the model is able to reproduce the performance of the ion guide remarkably well and that the main reason for the low yield of fission products is the low collection efficiency of the ion guide.
Based on the benchmark, a new ion guide is being designed. In the new design, the positions of the uranium targets and volume of the ion guide have been changed to increase the collection of fission products. This results in a five-fold increase of the yield. However, the collection efficiency of the new ion guide still needs to be improved in order to achieve intensities of the extracted fission products that are large enough to allow for reasonable measurement times.
Because the volume of the ion guide is increased significantly, the extraction time of the ions is expected to be longer than that from the previous ion guide. Therefore, an electric field guidance system that consists of a combination of a stationary electric field and an RF-carpet is considered to be deployed. The stationary field, produced from a set of DC-ring electrodes, accelerates the ions towards the RF-carpet at end plate of the ion guide. The RF-carpet consists of a time-dependent field, produced from a radio-frequent structure of concentric rings, with a DC-component that guides the ions towards the exit hole in the center of the end plate. In this paper we present the current status of the simulations and design of the new ion guide.
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ND 2022 : 15th International Conference on Nuclear Data for Science and TechnologyISSN Search the Publication Forum
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RIA Research and Innovation Action, H2020
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
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The computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at Uppmax partially funded by the Swedish Research Council through grant agreement no. 2018-05973. This work was supported by the Swedish research council Vetenskapsrådet (Ref. No. 2017-06481), the European Commission within the Horizon 2020 Framework Programme through Fission-2019-SANDA (Project No. 847552), the Swedish Radiation Safety Authority (SSM), and the Swedish Nuclear Fuel and Waste Management Co. (SKB). ...License
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