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2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)最新文献

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Spin-lattice separation of the spin-ladder compound BIP-TENO by microsecond megagauss field 微秒强场对自旋阶梯化合物BIP-TENO的自旋-晶格分离
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722650
K. Nomura, A. Ikeda, Y. Kohama, Y. Matsuda, S. Takeyama, N. Amaya, T. Ono, Y. Hosokoshi
{"title":"Spin-lattice separation of the spin-ladder compound BIP-TENO by microsecond megagauss field","authors":"K. Nomura, A. Ikeda, Y. Kohama, Y. Matsuda, S. Takeyama, N. Amaya, T. Ono, Y. Hosokoshi","doi":"10.1109/MEGAGAUSS.2018.8722650","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722650","url":null,"abstract":"We have conducted magnetization measurements of the $S = 1$ spin-ladder compound BIP-TENO using the single-turn coil method which generates micro-second pulsed magnetic field. We observed three magnetization plateaus in the magnetization process up to 100 T. We have also found that the magnetization process depends on the sweep speed of the magnetic fields. Possible origins of this phenomenon are (1) lowering temperature of the samples due to magnetocaloric effect with adiabatic condition realized in the fast (micro-second) pulsed magnetic field, and (2) spin-lattice separation due to a slow response of the magnetostriction whose response time is longer than microsecond range.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131514233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MHD Modeling of Shock Physics Experiments with the PHELIX Portable High Magnetic Field Drive PHELIX便携式强磁场驱动器冲击物理实验的MHD建模
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722663
C. Rousculp, M. Freeman, T. Voorhees, D. Fredenburg, J. Griego, D. Oró, A. Patten, J. Bradley, R. Reinovsky, P. M. Donovan, J. Dunwoody, F. Fierro, J. C. Lamar, F. Mariam, L. Neukirch, R. Randolph, W. Reass, A. Saunders, S. Sjue, Z. Tang, P. Turchi
{"title":"MHD Modeling of Shock Physics Experiments with the PHELIX Portable High Magnetic Field Drive","authors":"C. Rousculp, M. Freeman, T. Voorhees, D. Fredenburg, J. Griego, D. Oró, A. Patten, J. Bradley, R. Reinovsky, P. M. Donovan, J. Dunwoody, F. Fierro, J. C. Lamar, F. Mariam, L. Neukirch, R. Randolph, W. Reass, A. Saunders, S. Sjue, Z. Tang, P. Turchi","doi":"10.1109/MEGAGAUSS.2018.8722663","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722663","url":null,"abstract":"The PHELIX portable pulsed power driver has recently completed a set of experiments examining the response of granular material to convergent shock loading. Here a nearly 4 MA peak current is delivered to a Z-pinch load with a quarter wave cycle time of ~3 μs. This produces B ~ 0.30 MG field at the surface of a ~3 cm diameter, 1 mm thick, 3 cm tall Al liner. The liner is accelerated to ~800 km/s before shock impacting a target cylinder filled with fine-grain CeO2 powder. Design and analysis simulations are performed with 2D MHD Lagrangian/ALE code to predict the liner performance and material response. Computational results are compared to the PHELIX Faraday rotation measurements for load current as well as proton radiographic imaging of the evolution of the density profile in the CeO2.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134478329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Stabilized Liner Compressor Update 稳定尾管压缩机更新
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722677
G. Kiuttu, M. Frese, S. Frese, P. Turchi
{"title":"Stabilized Liner Compressor Update","authors":"G. Kiuttu, M. Frese, S. Frese, P. Turchi","doi":"10.1109/MEGAGAUSS.2018.8722677","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722677","url":null,"abstract":"The Stabilized Liner Compressor (SLC), described at the EAPPC-BEAMS-Megagauss conference [1], grew out of the original Linus program at the Naval Research Laboratory in the 1970s [2]. The idea then, as now, was to create a stable liner to compress magnetic fields or magnetized plasmas to high energy densities up to thermonuclear fusion conditions. Other liner compression schemes have been unsuccessful because of instabilities - in particular the Rayleigh-Taylor instability. In the case of Linus and SLC, stability is provided by rotation of the liner, which is formed from liquid metal. The current project has been supported by the Advanced Research Projects Agency - Energy (ARPA-E) under the ALPHA program, whose goal is to further technologies enabling lower-cost fusion approaches [3]. A critical tool for understanding and designing compression systems is MACH2, a 2 1/2-D ALE magnetohydrodynamics simulation code [4]. In this paper, we present the results of simulations leading to a point design for SLC demonstration, as well as an engineering description of the point design. We also describe technical issues encountered.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133665770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Explosive Magnetic Generators to Study Dynamic Properties of Materials under Shock-Wave Loading 爆炸磁发生器在冲击波载荷下材料动态特性研究中的应用
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/megagauss.2018.8722679
V. K. Baranov, P. Duday, A.G. Golubinskiy, A. M. Glybin, A. Ivanovskiy, D.A. Irinitchev, A. I. Krayev, S. A. Kostyukov, S. S. Nadezhin, R. Tagirov, A. A. Zimenkov
{"title":"Application of Explosive Magnetic Generators to Study Dynamic Properties of Materials under Shock-Wave Loading","authors":"V. K. Baranov, P. Duday, A.G. Golubinskiy, A. M. Glybin, A. Ivanovskiy, D.A. Irinitchev, A. I. Krayev, S. A. Kostyukov, S. S. Nadezhin, R. Tagirov, A. A. Zimenkov","doi":"10.1109/megagauss.2018.8722679","DOIUrl":"https://doi.org/10.1109/megagauss.2018.8722679","url":null,"abstract":"In recent years, the method of driving the liner with a magnetic field in a classical Z-pinch scheme has been intensively developed by the world research laboratories. The application of this method with the use of a liner as a cylindrical impactor opens up wide possibilities for studying the dynamic properties of materials under conditions of shock-wave axisymmetric loading. The paper presents the studies of the dynamic properties of various materials in the liner experiments using a helical EMG equipped with an explosive switch as a source of pulsed power. The setup and results of a series of experiments investigating the shear strength of beryllium in the strain rate range of 103–104 s−1 are described. A comparative analysis of applicability of various computational models for a description of the deformation process in axisymmetric geometry has been performed. The results of experiments studying the lead “ejecta” process under conditions of shock-wave loading are presented. The numerical simulation has determined the influence of the ejecta-forming surface profile on the velocity and distribution of particles in a dust cloud by varying the amplitude of the shock wave in the range of 15–40 GPa.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124797991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Effect of Metal Temper on Explosively-Formed Fuse Performance 金属回火对爆炸成型熔断器性能的影响
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722668
D. Tasker
{"title":"The Effect of Metal Temper on Explosively-Formed Fuse Performance","authors":"D. Tasker","doi":"10.1109/MEGAGAUSS.2018.8722668","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722668","url":null,"abstract":"A strong dependence of the dynamic resistivity of Explosively-Formed Fuses (EFF) on metal temper is reported. The explosively driven switch has been extremely effective in a wide range of large-scale experiments but good, predictive, computational models of its performance have proven elusive, possibly because the temper of the metal conductor has not been previously considered. Small-scale experiments were employed to study the effects of metal temper. It was found that the dynamic resistivity of the switch increased significantly with metal hardness; the dynamic resistivity of the hardest foils being approximately three times that of the dead-soft material. These results suggest that metal fracture is an important aspect of the EFF behavior.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127627373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Electric Field and Breakdown Modeling of Helical Explosive Generators 螺旋爆炸发生器的电场与击穿模型
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722646
G. Kiuttu, J. Chase, J. Javedani
{"title":"Electric Field and Breakdown Modeling of Helical Explosive Generators","authors":"G. Kiuttu, J. Chase, J. Javedani","doi":"10.1109/MEGAGAUSS.2018.8722646","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722646","url":null,"abstract":"At the 14th International Conference on Megagauss Magnetic Field and Related Topics (MG-XIV) Chase et al reported on modeling electrical breakdown in helical explosive generators [1]. The onset of electrical breakdown between stator and armature was predicted to occur just ahead of the advancing shock front of the expanding armature. A special set of generators was constructed without the usual stator wire insulation, so that the nitrogen fill gas was the only dielectric in the system. In this simplified configuration it was possible to predict when and where electrical breakdown would occur and benchmark the model. In this paper we describe the technique used to calculate the internal electric fields in helical generators, including the cases of only gas insulation and gas plus solid dielectric at the stator. The electric field model has been incorporated into the CAGEN explosive generator modeling code [2–4] and applied to the LLNL Mini-G [5,6] helical generator design.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117238599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
MEGAGAUSS 2018 Conference Photo MEGAGAUSS 2018会议照片
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/megagauss.2018.8722673
{"title":"MEGAGAUSS 2018 Conference Photo","authors":"","doi":"10.1109/megagauss.2018.8722673","DOIUrl":"https://doi.org/10.1109/megagauss.2018.8722673","url":null,"abstract":"","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123230390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Field-Induced Spin Nematic Phase in the $S=1$ Anisotropic Spin Ladder $S=1$各向异性自旋阶梯中的场致自旋向列相
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722674
Ryo Yamanokuchi, K. Okamoto, T. Sakai
{"title":"Field-Induced Spin Nematic Phase in the $S=1$ Anisotropic Spin Ladder","authors":"Ryo Yamanokuchi, K. Okamoto, T. Sakai","doi":"10.1109/MEGAGAUSS.2018.8722674","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722674","url":null,"abstract":"The $S=1$ spin ladder with the easy-axis single-ion anisotropy is investigated using the numerical diagonalization and the finite-size scaling analysis. It is found that the field-induced nematic Tomonaga-Luttinger liquid phase appears above the critical field. In addition, there exists another critical field at which the quantum phase transition from the nematic Tomonaga-Luttinger liquid phase to the conventional field-induced Tomonaga- Luttinger liquid phase occurs. Besides some phase diagrams are presented.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122929212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of Pulse Duration of the Soft X-ray Free Electron Laser at SACLA BL1 with Single-Shot Spectrometry 用单次光谱法评价SACLA BL1软x射线自由电子激光器的脉冲持续时间
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/megagauss.2018.8722659
Y. Kubota, I. Inoue, K. Togawa, R. Kinjo, H. Iwayama, J. Harries, Y. Inubushi, S. Owada, K. Tono, Takashi Tanaka, T. Hara, M. Yabashi
{"title":"Evaluation of Pulse Duration of the Soft X-ray Free Electron Laser at SACLA BL1 with Single-Shot Spectrometry","authors":"Y. Kubota, I. Inoue, K. Togawa, R. Kinjo, H. Iwayama, J. Harries, Y. Inubushi, S. Owada, K. Tono, Takashi Tanaka, T. Hara, M. Yabashi","doi":"10.1109/megagauss.2018.8722659","DOIUrl":"https://doi.org/10.1109/megagauss.2018.8722659","url":null,"abstract":"We performed single-shot spectrometry to evaluate the pulse duration of the soft X-ray free electron laser (FEL) at BL1 of SPring-8 Angstrom Compact free electron LAser (SACLA). The soft X-ray FEL beam was focused with a Kirkpatrick-Baez (KB) focusing mirror system and single-shot spectra were measured with a grating and a two dimensional detector. The spike widths of the spectra, which are inversely proportional to the pulse duration, varied when we changed the operation conditions of the accelerator. By comparing the spike widths with a simulation, the pulse duration was evaluated to be less than 100 fs.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123383376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Progress on high current pulse transmission based on the Primary Test Stand 基于主试验台的大电流脉冲传输研究进展
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS) Pub Date : 2018-09-01 DOI: 10.1109/MEGAGAUSS.2018.8722647
W. Zou, Guilin Wang, J. Dan, S. Duan, Bing Wei, Zhaohui Zhang
{"title":"Progress on high current pulse transmission based on the Primary Test Stand","authors":"W. Zou, Guilin Wang, J. Dan, S. Duan, Bing Wei, Zhaohui Zhang","doi":"10.1109/MEGAGAUSS.2018.8722647","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2018.8722647","url":null,"abstract":"High efficiency pulse current transmission is critical important for inertial confinement fusion (ICF), dynamic material property research and other high energy density physics experiments, in which current density in several MA/cm will achieved on the electrode surface near the load. Independent on power generation, high current pulse transmission to load has to deal with structural transition in transmission line, massive electrons/ions insulation, ~MA/cm current density, megagauss (MG) magnetic field and its diffuse into conductor. The current loss across transition and the penetration of MG magnetic fields into conductors may cause anode-cathode gap closure, and even transmission failure. In order to understand the pulse transmission property in MA/cm range, two types of experiments were carried out on the Primary Test Stand. In the stainless steel electrode transmission experiments, the expansion velocity of conductor at several MG magnetic field was recorded with displacement interferometer system and the evolution process of dense plasma were recorded by shadowgraphy system. One dimensional magneto-hydrodynamics (MHD) simulations to the experiments were carried out and a threshold magnetic field of 3.3 MG for thermal plasma formation was inferred for stainless steel. In the coaxial-conical transition experiment, current transmission efficiency under MA/cm current density was derived for different states. In this paper, the pulsed power platform, the experimental designs and results will be presented.","PeriodicalId":207949,"journal":{"name":"2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129771255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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