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Matter and Radiation at Extremes
Contents
2017
Volume: 2 Issue 6
8 Article(s)
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Matter and Radiation at Extremes2017年第2卷第6期 总目录
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 1 (2017)
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Acknowledgement to Reviewers
Acknowledgement to Reviewers
[in Chinese]
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 309 (2017)
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Discussion
Public debate on metallic hydrogen to boost high pressure research
Hua Y. Geng
Instead of praises from colleagues, the claim of observation of metallic hydrogen at 495 GPa by Dias and Silvera met much skepticism, and grew into a public debate at the International Conference on High-Pressure Science and Technology, AIRAPT26. We briefly review this debate, and extend the topic to show that this dis
Instead of praises from colleagues, the claim of observation of metallic hydrogen at 495 GPa by Dias and Silvera met much skepticism, and grew into a public debate at the International Conference on High-Pressure Science and Technology, AIRAPT26. We briefly review this debate, and extend the topic to show that this disputation could be an opportunity to benefit the whole high pressure community..
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 275 (2017)
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GUIDE for AUTHORS
GUIDE FOR AUTHORS
[in Chinese]
.
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 310 (2017)
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Research Article
Transport properties of warm and hot dense iron from orbital free and corrected Yukawa potential molecular dynamics
H.Y. Sun, Dongdong Kang, Yong Hou, and J.Y. Dai
The equation of states, diffusions, and viscosities of strongly coupled Fe at 80 and 240 eV with densities from 1.6 to 40 g/cm3 are studied by orbital-free molecular dynamics, classical molecular dynamics with a corrected Yukawa potential and compared with the results from average atom model. A new local pseudopotentia
The equation of states, diffusions, and viscosities of strongly coupled Fe at 80 and 240 eV with densities from 1.6 to 40 g/cm
3
are studied by orbital-free molecular dynamics, classical molecular dynamics with a corrected Yukawa potential and compared with the results from average atom model. A new local pseudopotential is generated for orbital free calculations. For low densities, the Yukawa model captures the correct ionic interaction behavior around the first peak of the radial distribution function (RDF), thus it gives correct RDFs and transport coefficients. For higher densities, the scaled transformation of the Yukawa potential or adding a short range repulsion part to the Yukawa potential can give correct RDFs and transport coefficients. The corrected potentials are further validated by the force matching method..
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 287 (2017)
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A tabletop, ultrashort pulse photoneutron source driven by electrons from laser wakefield acceleration
X.J. Jiao, J.M. Shaw, T. Wang, X.M. Wang, H. Tsai, P. Poth, I. Pomerantz, L.A. Labun, T. Toncian, M.C. Downer, and B.M. Hegelich
Relativistic electron beams driven by laser wakefield acceleration were utilized to produce ultrashort neutron sources. The experiment was carried out on the 38 fs, ~0.5 J, 800 nm Ti:Sapphire laser in the 10 TW UT3 laser lab at University of Texas at Austin. The target gas was a high density pulsed gas jet composed of
Relativistic electron beams driven by laser wakefield acceleration were utilized to produce ultrashort neutron sources. The experiment was carried out on the 38 fs, ~0.5 J, 800 nm Ti:Sapphire laser in the 10 TW UT
3
laser lab at University of Texas at Austin. The target gas was a high density pulsed gas jet composed of 90% He and 10% N
2
. The laser pulse with a peak intensity of 1.5×10
18
W/cm
2
interacted with the target to create a cylindrical plasma channel of 60 mm radius (FWHM) and 1.5 mm length (FWHM). Electron beams of ~80 pC with the Gaussian energy distribution centered at 37 MeV and a width of 30 MeV (FWHM) were produced via laser wakefield acceleration. Neutron fluences of ~2.4×10
6
per shot with hundreds of ps temporal length were generated through bremsstrahlung and subsequent photoneutron reactions in a 26.6 mm thick tungsten converter. Results were compared with those of simulations using EPOCH and GEANT4, showing agreement in electron spectrum, neutron fluence, neutron angular distribution and conversion rate..
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 296 (2017)
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Lifetime and shelf life of sealed tritium-filled plasma focus chambers with gas generator
B.D. Lemeshko, А.К. Dulatov, Yu V. Mikhailov, I.A. Prokuratov, A.N. Selifanov, T.S. Fatiev, and V.G. Andreev
The paper describes the operation features of plasma focus chambers using deuteriumetritium mixture. Handling tritium requires the use of sealed, vacuum-tight plasma focus chambers. In these chambers, there is an accumulation of the impurity gases released from the inside surfaces of the electrodes and the insulator wh
The paper describes the operation features of plasma focus chambers using deuteriumetritium mixture. Handling tritium requires the use of sealed, vacuum-tight plasma focus chambers. In these chambers, there is an accumulation of the impurity gases released from the inside surfaces of the electrodes and the insulator while moving plasma current sheath inside chambers interacting with b-electrons generated due to the decay of tritium. Decay of tritium is also accompanied by the accumulation of helium. Impurities lead to a decreased yield of neutron emission from plasma focus chambers, especially for long term operation. The paper presents an option of absorption type gas generator in the chamber based on porous titanium, which allows to significantly increase the lifetime and shelf life of tritium chambers. It also shows the results of experiments on the comparison of the operation of sealed plasma focus chambers with and without the gas generator..
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 303 (2017)
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Review Article
The pulsed high magnetic field facility and scientific research at Wuhan National High Magnetic Field Center
Xiaotao Han, Tao Peng, Hongfa Ding, Tonghai Ding, Zengwei Zhu, Zhengcai Xia, Junfeng Wang, Junbo Han, Zhongwen Ouyang, Zhenxing Wang, Yibo Han, Houxiu Xiao, Quanliang Cao, Yiliang Lv, Yuan Pan, and Liang Li
Wuhan National High Magnetic Field Center (WHMFC) at Huazhong University of Science and Technology is one of the top-class research centers in the world, which can offer pulsed fields up to 90.6 T with different field waveforms for scientific research and has passed the final evaluation of the Chinese government in 201
Wuhan National High Magnetic Field Center (WHMFC) at Huazhong University of Science and Technology is one of the top-class research centers in the world, which can offer pulsed fields up to 90.6 T with different field waveforms for scientific research and has passed the final evaluation of the Chinese government in 2014. This paper will give a brief introduction of the facility and the development status of pulsed magnetic fields research at WHMFC. In addition, it will describe the application development of pulsed magnetic fields in both scientific and industrial research..
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Matter and Radiation at Extremes
Publication Date: Jan. 01, 1900
Vol. 2, Issue 6, 278 (2017)
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Acknowledgement to Reviewers
Discussion
GUIDE for AUTHORS
Research Article
Review Article