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Authors = Manfred Lennartz

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17 pages, 8426 KiB  
Article
Polarimetry for 3He Ion Beams from Laser–Plasma Interactions
by Chuan Zheng, Pavel Fedorets, Ralf Engels, Chrysovalantis Kannis, Ilhan Engin, Sören Möller, Robert Swaczyna, Herbert Feilbach, Harald Glückler, Manfred Lennartz, Heinz Pfeifer, Johannes Pfennings, Claus M. Schneider, Norbert Schnitzler, Helmut Soltner and Markus Büscher
Instruments 2022, 6(4), 61; https://doi.org/10.3390/instruments6040061 - 10 Oct 2022
Cited by 2 | Viewed by 2165
Abstract
We present a compact polarimeter for 3He ions with special emphasis on the analysis of short-pulsed beams accelerated during laser–plasma interactions. We discuss the specific boundary conditions for the polarimeter, such as the properties of laser-driven ion beams, the selection of the [...] Read more.
We present a compact polarimeter for 3He ions with special emphasis on the analysis of short-pulsed beams accelerated during laser–plasma interactions. We discuss the specific boundary conditions for the polarimeter, such as the properties of laser-driven ion beams, the selection of the polarization-sensitive reaction in the polarimeter, the representation of the analyzing-power contour map, the choice of the detector material used for particle identification, as well as the production procedure of the required deuterated foil-targets. The assembled polarimeter has been tested using a tandem accelerator delivering unpolarized 3He ion beams, demonstrating good performance in the few-MeV range. The statistical accuracy and the deduced figure-of-merit of the polarimetry are discussed, including the count-rate requirement and the lower limit of accuracy for beam-polarization measurements at a laser-based ion source. Full article
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19 pages, 17047 KiB  
Article
A High-Density Polarized 3He Gas–Jet Target for Laser–Plasma Applications
by Pavel Fedorets, Chuan Zheng, Ralf Engels, Ilhan Engin, Herbert Feilbach, Ulrich Giesen, Harald Glückler, Chrysovalantis Kannis, Franz Klehr, Manfred Lennartz, Heinz Pfeifer, Johannes Pfennings, Claus Michael Schneider, Norbert Schnitzler, Helmut Soltner, Robert Swaczyna and Markus Büscher
Instruments 2022, 6(2), 18; https://doi.org/10.3390/instruments6020018 - 25 Apr 2022
Cited by 8 | Viewed by 3429
Abstract
A laser-driven spin-polarized 3He2+-beam source for nuclear–physics experiments and for the investigation of polarized nuclear fusion demands a high-density polarized 3He gas-jet target. Such a target requires a magnetic system providing a permanent homogeneous holding field for the nuclear [...] Read more.
A laser-driven spin-polarized 3He2+-beam source for nuclear–physics experiments and for the investigation of polarized nuclear fusion demands a high-density polarized 3He gas-jet target. Such a target requires a magnetic system providing a permanent homogeneous holding field for the nuclear spins plus a set of coils for adjusting the orientation of the polarization. Starting from a transport vessel at a maximum pressure of 3 bar, the helium gas is compressed for a short time and can be injected into a laser–interaction chamber through a non-magnetic opening valve and nozzle, thus forming jets with densities of about a few 1019 cm−3 and widths of about 1 mm. The target comprises a 3D adjustment system for precise positioning of the jet relative to the laser focus. An auxiliary gas system provides remote target operation and flushing of the gas lines with Ar gas, which helps to reduce polarization losses. The design of the target, its operation procedures and first experimental results are presented. Full article
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