2021 Fiscal Year Research-status Report
Time-resolved diagnostics of relativistic plasma singularities
| Project/Area Number |
19KK0355
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| Research Institution | National Institutes for Quantum Science and Technology |
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Principal Investigator |
PIROZHKOV Alex 国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 光量子科学研究部, 上席研究員 (00446410)
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| Project Period (FY) |
2020 – 2022
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| Keywords | Coherent x-ray source / New imaging paradigm / BISER / Relativistic plasma / Plasma singularities |
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| Outline of Annual Research Achievements |
I visited the Counterpart Research Institution, the Central Laser Facility (CLF), Rutherford Appleton Lab (RAL), UK, during July-December 2021. We performed the planned joint international experiment with the Astra laser, experiment #19210005. The experiment was rather successful, we dramatically (~100 times) enhanced the BISER x-ray yield, and by this might achieve one of the main Goals of the Root Project, i.e. dramatic BISER enhancement by singularity control. However, most of the collaborators from Japan and UK could not join the experiment due to the COVID pandemic. Thus, the experiment was performed with only ~2 (sometimes 3-4) researchers, while we expected 5-6 persons working all the time. Further, the CLF schedule before the experiment was severely affected and there were restrictions on the work in the Lab, resulting in significant delays and problems in experiment preparation.
Due to the lack of man power and preparation problems, two main optical diagnostics were operated in a limited mode without high temporal resolution. Thus, our experimental knowledge of relativistic plasma dynamics was limited. We are now analyzing the existing data, which were anyway high-quality, and performing simulations to unravel the physics behind the achieved BISER enhancement.
Apart from this, we upgraded our imaging XUV spectrograph to provide 4D information, namely 1D spectrally + 1D spatially + 2D angularly resolved data.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
COVID-19 caused delays and problems.
The goals of the Astra experiment #19210005 were high-resolution imaging of plasma singularities by time-resolved Top View imager and 10 fs Schlieren optical probe. Due to COVID-19, the Central Laser Facility (CLF) schedule was delayed; further, most of the collaborators could not come. Thus, we could not obtain time-resolved Top View, neither we could get 10 fs optical probe. Instead, we used time-integrated Top View and ~50 fs optical probe, which limited our understanding of physics behind the great (>100x) BISER enhancement. Despite the problems, we managed to significantly improve performance of these diagnostics compared to the previous experiments: Top View resolution was enhanced from ~2 um (our previous best) down to sub-um, and the Shadow (used previously) was upgraded to the more-informative Schlieren optical probe.
We are now analyzing these high-quality optical data (although without high temporal resolution), very informative x-ray data, and performing hydrodynamic simulations of the supersonic gas jet flow and PIC simulations of relativistic laser-plasma interaction to understand the BISER enhancement physics.
We developed and tested a new 4D XUV spectrograph: We used a strongly-aperiodic VLS grating to focus the 1st spectral order and get 1D spectral resolution of ~300 and 1D spatial resolution of ~8um, while the defocused 0th order was used for simultaneous 2D angular distribution measurement. This provided new insight into the BISER coherent x-ray source properties from the x-ray diagnostics side.
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| Strategy for Future Research Activity |
The 2021 Astra experiment generated extremely bright BISER and it is very important to understand the physics of this enhancement. We plan to reproduce this with the J-KAREN-P laser in the next joint international experiment in Japan, and to further improve our Top View Imaging and Schlieren Optical Probe for obtaining in-depth information on relativistic plasma singularities. With these, we plan to obtain the Project and Root Project Goals, i.e. achieve the Filamentation and Self-Focusing control for further BISER brightness enhancement.
The 2021 Astra experiment also showed that the BISER angular distribution is wider than acceptance angle of our present x-ray optics. Thus, we need larger-diameter x-ray optics in order to collect the entire coherent x-ray beam. We cannot acquire such large optics as this was not in an initial Project plan. Instead, in 2022 we will estimate the BISER angular distribution and try to select best positions for our small x-ray mirrors. This will not be a real angular distribution measurement (just an estimation), nor the full-beam collection. A real measurement and full collection would cost additionally 1,500-2,000 man yen and could probably result in hundreds of micro-Joules and >10^13 photons of collected coherent soft x-rays, i.e. similar to soft x-ray FEL performance. This remains an outstanding scientific problem and a #1 goal for future Projects.
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[Presentation] BISER enhancement with Astra laser2022
Author(s)
A.N.Shatokhin; A.V.Kotov; T.M.Jeong; G.M.Grittani; T.Dzelzainis; G.Hull; S.Dann; A.Sagisaka; E.A.Vishnyakov; A.O.Kolesnikov; M.Koike; T.Zh.Esirkepov; M.Kando; K.Ogura; T.A.Pikuz; J.K.Koga; H.Kiriyama; A.A.Soloviev; E.N.Ragozin; S.V.Bulanov; K.Kondo; T.Kawachi; D.R.Symes; D.Neely; A.S.Pirozhkov
Organizer
The 69th JSAP Spring Meeting 2022
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[Presentation] Multiple diagnostics in laser-plasma experiment at ~10^22 W/cm^22021
Author(s)
A.S.Pirozhkov; A.Sagisaka; K.Ogura; T.Zh.Esirkepov; B.Gonzalez Izquierdo; A.N.Shatokhin; E.A.Vishnyakov; C.Armstrong; T.A.Pikuz; M.A.Alkhimova; S.A.Pikuz; W.Yan; T.M.Jeong; S.Singh; P.Hadjisolomou; O.Finke; G.Grittani; M.Nevrkla; C.Lazzarini; A.Velyhan; T.Hayakawa; Y.Fukuda; J.K.Koga; M.Ishino; Ko.Kondo; et al.
Organizer
The Optics & Photonics International Congress 2021 - International Conference on High-Energy Density Sciences 2021
Int'l Joint Research
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[Presentation] Generation of hard x-rays at intensities approaching ~10^22 W/cm^22021
Author(s)
A.S.Pirozhkov; A.Sagisaka; K.Ogura; T.Zh.Esirkepov; B.Gonzalez Izquierdo; A.N.Shatokhin; E.A.Vishnyakov; C.Armstrong; T.A.Pikuz; M.A.Alkhimova; S.A.Pikuz; W.Yan; T.M.Jeong; S.Singh; P.Hadjisolomou; O.Finke; G.Grittani; M.Nevrkla; C.Lazzarini; A.Velyhan; T.Hayakawa; Y.Fukuda; J.K.Koga; M.Ishino; Ko.Kondo; et al.
Organizer
3rd International Conference on Nuclear Photonics 2020 (NP2020)
Int'l Joint Research
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[Presentation] Overview of the 10^22 Experiment with the J-KAREN-P laser2021
Author(s)
A.S.Pirozhkov; A.Sagisaka; K.Ogura; T.Zh.Esirkepov; B.Gonzalez Izquierdo; A.N.Shatokhin; E.A.Vishnyakov; C.Armstrong; T.A.Pikuz; M.A.Alkhimova; S.A.Pikuz; W.Yan; T.M.Jeong; S.Singh; P.Hadjisolomou; O.Finke; G.Grittani; M.Nevrkla; C.Lazzarini; A.Velyhan; T.Hayakawa; Y.Fukuda; J.K.Koga; M.Ishino; Ko.Kondo; et al.
Organizer
OPTO-2021 Symposium on Photon and Beam Science
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[Presentation] Experiment towards the Gamma Flare regime2021
Author(s)
A.S.Pirozhkov; A.Sagisaka; K.Ogura; T.Zh.Esirkepov; B.Gonzalez Izquierdo; A.N.Shatokhin; E.A.Vishnyakov; C.Armstrong; T.A.Pikuz; M.A.Alkhimova; S.A.Pikuz; W.Yan; T.M.Jeong; S.Singh; P.Hadjisolomou; O.Finke; G.Grittani; M.Nevrkla; C.Lazzarini; A.Velyhan; T.Hayakawa; Y.Fukuda; J.K.Koga; M.Ishino; Ko.Kondo; et al.
Organizer
The 5th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP)
Int'l Joint Research / Invited
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[Presentation] 2021 Astra BISER experiment highlights2021
Author(s)
Alexey Shatokhin; Alexander Kotov; Tae Moon Jeong; Gabriele Maria Grittani; Thomas Dzelzainis; Gregory Hull; Stephen Dann; Akito Sagisaka; Eugene Vishnyakov; Alexey Kolesnikov; Timur Esirkepov; Masaki Kando; Alexander Soloviev; Eugene Ragozin; Dan Symes; David Neely ; and Alexander Pirozhkov
Organizer
Christmas High Power Laser Science Community Meeting
Int'l Joint Research
