Depolarization of spin-polarized hydrogen via collisions with chlorine atoms at ultrahigh density

Spiliotis, Alexandros K.; Xygkis, Michalis; Koutrakis, Michail E.; Sofikitis, Dimitris; Rakitzis, T. Peter

doi:10.1016/j.chphi.2021.100022

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…The high-energy LSP electrons can be generated in a controllable laser wakefield acceleration scheme, [67][68][69][70][71][72][73] in which a prepolarized gas target can be prepared experimentally via ultraviolet photodissociation of a hydrogen-halogen molecule. [74][75][76][77]…”

Section: Results and Discussion A Theoretical Analysis Of Manipulatio...mentioning

confidence: 99%

Manipulation of γ-ray polarization in Compton scattering

Wang,

Ababekri,

Wan

et al. 2024

Physics of Plasmas

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High-brilliance high-polarization γ rays based on Compton scattering are of great significance in broad areas, such as nuclear physics, high-energy physics, astrophysics, etc. However, the transfer mechanism of spin angular momentum in the transition from linear through weakly into strongly nonlinear processes is still unclear, which severely limits the simultaneous control of brilliance and polarization of high-energy γ rays. In this work, we clarify the transfer mechanism in the transition regions and put forward a clear way to efficiently manipulate the polarization of emitted photons. We find that to simultaneously generate high-energy, high-brilliance, and high-polarization γ rays, it is better to increase the laser intensity for the initially spin-polarized electron beam. However, for the case of employing the initially spin-nonpolarized electron beam, in addition to increasing laser intensity, it is also necessary to increase the energy of the electron beam. Because the γ photon polarization emitted through the single-photon absorption channel is mainly attributed to the spin transfer of laser photons, while in multi-photon absorption channels, the electron spin plays a major role. Moreover, we confirm that the signature of γ-ray polarization can be applied to observing the nonlinear effects (multi-photon absorption) of Compton scattering with moderate-intensity laser facilities.

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Section: Results and Discussion A Theoretical Analysis Of Manipulatio...mentioning

confidence: 99%

Manipulation of γ-ray polarization in Compton scattering

Wang,

Ababekri,

Wan

et al. 2024

Physics of Plasmas

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“…Two density regimes are observed depending on the focusing geometry [11]. If the laser beam is unfocused, then ∼0.1% of the HY is photodissociated and the produced densities of the spin-polarized atoms are of the order of 10 16 cm -3 .…”

Section: Pos(pstp2022)032mentioning

confidence: 99%

Development of polarized sources based on molecular photodissociation

Kannis¹,

Büscher²,

Engels³

et al. 2023

Proceedings of 19th Workshop on Polarized Sources, Targets and Polarimetry — PoS(PSTP2022)

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Molecular photodissociation is an innovative method for the preparation of polarized atoms and molecules. It is a fundamental chemical process that involves the absorption of one or more polarized photons by a molecule including its fragmentation into polarized atomic (or molecular) fragments. Recently, T. P. Rakitzis' group produced high densities of spin-polarized hydrogen atoms applying molecular photodissociation to hydrogen halides. The obtained densities (10 19 cm −3 ) and short production times (ns timescales) surpass by several orders of magnitude conventional methods such as spin-exchange optical pumping and Stern-Gerlach spin separation. These density and time regimes make it an ideal candidate for a broad range of applications, e.g., laserinduced acceleration from polarized gas targets and polarized five-nucleon fusion reactions (d-3 H, d-3 He). The second has been shown to have an increased cross section by ∼50% compared to the unpolarized case. The photodissociation method has been adopted by M. Büscher's group for the production of polarized proton and deuteron beams at the Forschungszentrum Jülich. Here, we report on the production and detection scheme of these beams.

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“…The photo-dissociation of hydrogen halides (HCl, HBr) and deuterium iodide (DI), with circularly polarized UV laser pulses, has been shown to produce ultrahigh density spin-polarized H and D atoms [16,17], and opens the way for the production of very intense polarized proton and deuteron beams. The expected density has been shown to be at least in the order of 10 19 cm −3 [18], which is then very promising for the fusion research, or for the polarized ion beams in accelerator physics, which involves also the group of HHUD and FZJ.…”

Section: The Prefer Challenges: Study Production and Test Of Polarize...mentioning

confidence: 99%

Polarized H₂, D₂ and HD Molecules and Their Possible Use to Feed a Polarized \(\text{H}_{2}^{ + }\), \(\text{D}_{2}^{ + }\) or HD⁺ Ion Source for Stripping Injection into Storage Rings

Engels

Grigoryev

Valdau

et al. 2022

Proceedings of the 24th International Spin Symposium (SPIN2021)

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The PREFER (Polarization REsearch for Fusion Experiments and Reactors) collaboration aims to address the know-hows in different fields and techniques to the challenging bet on fusion with polarized fuel. The efforts on a variety of duties and goals are shared between different research groups, indicated here by underlining in the authors' list the scientific responsibles. Starting from still open questions of fusion reaction physics, as for example the study of D+D spin-dependent cross-sections (Vasilyev) to the acceleration of polarized ions from laser-induced plasmas (Büscher), there are many connections between the involved research groups. The collaboration is also tackling the production of nuclear polarized molecules, recombined from a polarized atomic beam (Engels), and its cryogenic condensation and transport (Ciullo). Other options for the production of polarized fuel are investigated in parallel, like spin separation of molecules in polarized molecular beam sources (Toporkov), or via photodissociation of molecules into polarized hydrogen/deuterium atoms (Rakitzis). The status of the different fields under investigation and the connections between these topics and the different research groups will be provided.

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Depolarization of spin-polarized hydrogen via collisions with chlorine atoms at ultrahigh density

Cited by 7 publications

References 16 publications

Manipulation of γ-ray polarization in Compton scattering

Manipulation of γ-ray polarization in Compton scattering

Development of polarized sources based on molecular photodissociation

Polarized H₂, D₂ and HD Molecules and Their Possible Use to Feed a Polarized \(\text{H}_{2}^{ + }\), \(\text{D}_{2}^{ + }\) or HD⁺ Ion Source for Stripping Injection into Storage Rings

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Depolarization of spin-polarized hydrogen via collisions with chlorine atoms at ultrahigh density

Cited by 7 publications

References 16 publications

Manipulation of γ-ray polarization in Compton scattering

Manipulation of γ-ray polarization in Compton scattering

Development of polarized sources based on molecular photodissociation

Polarized H2, D2 and HD Molecules and Their Possible Use to Feed a Polarized \(\text{H}_{2}^{ + }\), \(\text{D}_{2}^{ + }\) or HD+ Ion Source for Stripping Injection into Storage Rings

Contact Info

Product

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Polarized H₂, D₂ and HD Molecules and Their Possible Use to Feed a Polarized \(\text{H}_{2}^{ + }\), \(\text{D}_{2}^{ + }\) or HD⁺ Ion Source for Stripping Injection into Storage Rings