21 results on '"Tuo, Zhu"'
Search Results
2. Multi-keV x-ray radiator from titanium cylindrical cavity at the Shenguang-III prototype laser facility
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Yi Tao, Lifei Hou, Dong Yang, Yukun Li, Chao Zeng, Yimeng Yang, Jiyan Zhang, Bo Qing, Longfei Jing, Jiamin Yang, Yuxue Zhang, Tianming Song, Xingsen Che, Junwen Gao, Yang Zhao, Yan Zhao, Tuo Zhu, Zheng Yuan, Ruizhen Yu, Xiayu Zan, Gang Xiong, Bo Yu, Guohong Yang, Minxi Wei, Zhimin Hu, Rongqing Yi, Yunsong Dong, Min Lv, Zhichao Li, Chengwu Huang, Hang Zhao, Kaiming Zhou, Zhiyu Zhang, and Jinghui Chen
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Physics ,Range (particle radiation) ,Thomson scattering ,business.industry ,Energy conversion efficiency ,Plasma ,Electron ,Photon energy ,Condensed Matter Physics ,Laser ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Optics ,law ,0103 physical sciences ,Electron temperature ,010306 general physics ,business - Abstract
Great efforts have been made to create a bright K-shell source using the thin metal cylindrical cavities in the past few decades. Several metal materials such as titanium (Ti), iron, and so on have been tested for high x-ray conversion efficiency mainly at the OMEGA and NIF laser facilities. Recently, x-ray sources in Ti K-shell transition energy range were investigated at the Shenguang-III prototype laser facility with ∼5 kJ laser energy. The experiments were aimed to reproduce the previous ones at OMEGA, but with an extraordinarily small volume of cylindrical cavity and detailed characterizations of the x-ray source. The cavities were 800 μm inner diameter, 800 μm length, and 30 μm thick plastic tubes supporting 1 μm thick Ti. Seven laser beams were focused to 200 μm diameter. The combination of the small cavity volume and the focused laser spots is intended to improve the electron temperature with limited laser energy since the electron temperature is a key issue for high x-ray conversion efficiency. Thomson scattering was adopted to experimentally probe the electron temperatures at special time and space zones as well as the average temperature obtained from the Ti K-shell spectrum. The evolutions of the electron temperature and density are predicted by the radiation hydrodynamic simulation. A top view and two photon energy bands of x-ray source images provide a way to directly observe the plasma movement toward the cavity axis and distinguish the different emission mechanisms between the Ti K-shell and lower energy x rays. Six Higher-energy x-ray detectors located at different angles were used to record the Ti K-shell x-ray emission and demonstrate its isotropic feature. The characteristics of the x-ray radiate intensity including the time evolution, the angular distribution, and the total yields for both the photon energy regions above and below 4 keV are compared between the cavity and planar targets. Obviously, different behaviors were found between the two photon energy regions and the two types of targets. The x-ray conversion efficiency of the Ti cylinder was determined to be ∼ 4 % and ∼ 21 % in 4 π sr in the Ti K-shell (4–7 keV) and
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- 2021
3. Continued Study on Hohlraum Radiation Source with Approximately Constant Radiation Temperature
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Jiamin Yang, Zhichao Li, Tianming Song, Tuo Zhu, and Chengwu Huang
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Physics ,business.industry ,medicine.medical_treatment ,Plasma ,Radiation ,Condensed Matter Physics ,Laser ,Ablation ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Pulse (physics) ,Optics ,Hohlraum ,law ,Power Balance ,0103 physical sciences ,medicine ,010306 general physics ,business ,Flattop - Abstract
An experiment was performed on the Shenguang III prototype laser facility to continue the study on hohlraum radiation source with approximately constant radiation temperature using a continuously shaped laser pulse. A radiation source with a flattop temperature of about 130 eV that lasted about 5 ns was obtained. The previous analytical iteration method based on power balance and self-similar solution of ablation was modified taking into account the plasma movements and it was used to design the laser pulse shape for experiment. A comparison between experimental results and simulation is presented and better agreement was achieved using the modified method. Further improvements are discussed.
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- 2016
4. Experimental study of X-ray emission properties of laser produced plasmas with Au and Au foam layer targets
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Tuo Zhu, Wanli Shang, Tianming Song, Chenwu Huang, Wenhai Zhang, Yunsong Dong, and Jiamin Yang
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Materials science ,Spectral power distribution ,Astrophysics::High Energy Astrophysical Phenomena ,Mechanical Engineering ,Energy conversion efficiency ,Metals and Alloys ,X-ray ,Plasma ,Laser ,law.invention ,Angular distribution ,Mechanics of Materials ,law ,Materials Chemistry ,Atomic physics ,Layer (electronics) - Abstract
The X-ray emission properties of Au plasmas consist of spectral distribution, M band fraction (2–4 keV), X-ray angular distribution and X-ray conversion efficiency, are imperative for various X-ray source applications. In order to investigate the X-ray emission properties of laser produced plasmas with Au and Au foam targets, experiments were carried out in Shenguang II laser facility. Au foam targets with densities of 0.6 and 0.4 g/cm3 were employed. The X-ray emission properties were measured. Excellent agreements of the experimental and theoretical spectral distributions and M band fractions were achieved.
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- 2013
5. The investigation on hydrogenation platform for silicon solar cells based on high intensity infrared LEDs
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Li Chao, Guoqing Chen, Xi Xi, Rulong Chen, Jianbo Shao, Tuo Zhu, Wang Xiao, Guilin Liu, Weiying Qian, Guohua Li, and Yiqing Zhu
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010302 applied physics ,Materials science ,Silicon ,Passivation ,Renewable Energy, Sustainability and the Environment ,Infrared ,business.industry ,chemistry.chemical_element ,02 engineering and technology ,Carrier lifetime ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,Monocrystalline silicon ,Light intensity ,chemistry ,law ,0103 physical sciences ,Optoelectronics ,0210 nano-technology ,business ,Common emitter ,Light-emitting diode - Abstract
The research on the hydrogen passivation process for silicon solar cells has been developed for a long time. Recently, researchers have investigated the use of lasers as light sources. It has been found that hydrogen passivation technology can improve the minority carrier lifetime and passivate some impurities and defects in silicon solar cells. In this paper, a hydrogenation platform for silicon solar cells based on high intensity infrared LEDs of 940 nm was built. After a number of comparative experiments, electrical characteristics, photo-luminescence images, and light beam induced current were applied before and after hydrogenation to distinguish the passivation effect. It was found that the effect of hydrogen passivation on monocrystalline boron-doped passivated emitter and rear contact (PERC) solar cells by using infrared LEDs as the light source was satisfactory under the condition of suitable light intensity and temperature. It has a remarkable effect on improving the electrical characteristics an...
- Published
- 2018
6. Efficient soft x-ray sources from laser-irradiated gold foam targets with well-controlled impurities
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Tuo Zhu, Huabing Du, Xiayu Zhan, Tianming Song, Jiamin Yang, Yunsong Dong, Wanli Shang, Lu Zhang, Yongkun Ding, Wenhai Zhang, Feng Wang, Zhichao Li, Chengwu Huang, Shaoen Jiang, and Shenye Liu
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Nuclear and High Energy Physics ,Brightness ,Materials science ,business.industry ,Astrophysics::High Energy Astrophysical Phenomena ,Energy conversion efficiency ,Nanotechnology ,Plasma ,Condensed Matter Physics ,Kinetic energy ,Laser ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,law ,Impurity ,0103 physical sciences ,Optoelectronics ,Irradiation ,010306 general physics ,business ,Power density - Abstract
As an important x-ray source, enhancement of x-ray emissions from laser-produced plasmas is significant for various applications. Due to less expanding kinetic loss, gold foam with low initial density can have an enhanced x-ray conversion efficiency compared with solid-density gold. However, low-Z impurities within gold foam targets will diminish the enhancement remarkably, and should be tightly controlled. This paper presents an experimental study of a high brightness laser plasma soft x-ray source, based on a g gold foam target with negligible impurities irradiated by nanosecond laser pulses with power density around 3 × 10 W at the Shenguang II laser facility. A conversion efficiency, from multi-eV to multi-keV, of % is achieved in the x-ray emissions—about 21% relative enhancement compared with a solid-density gold target, and the highest conversion efficiency for Au foam planar targets yet. Good agreement has been achieved between the semi-analytical model prediction and the experimental results.
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- 2017
7. Measurement of residual carbon in chamber of Shenguang II laser facility
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Tuo Zhu, Ruizhen Yu, S. Y. Liu, Fang Wang, Wan-Li Shang (尚万里), Shuqing Jiang, Jianlun Yang, and Wenhai Zhang
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Physics ,business.industry ,Condensation ,Analytical chemistry ,Plasma ,Condensed Matter Physics ,Laser ,Residual ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Optics ,K-edge ,law ,Torr ,0103 physical sciences ,010306 general physics ,business ,Inertial confinement fusion ,FOIL method - Abstract
It is reported that in National Ignition Facility's shock timing campaign, there is a 2 μm layer of residual air condensation on the cold laser entrance hole window, and residual gas level of ∼5×10−6 Torr ( ∼6.6×10−4 Pa) in the chamber [Robey et al., Phys. Plasmas 19, 042706 (2012)]. On Shenguang (SG) II and III laser facilities, a nominal residual gas level in the chamber is ∼10−2 Pa in experiment. In this work, the residual Carbon (C) level in the SG II chamber is investigated experimentally using a transmission grating spectrometer (TGS). The experimental result shows that there is a clear C K edge (280–300 eV), which implies that there is residual C condensation on the charge-coupled device (CCD) silicon oxide layer. The effect of the C condensation on the CCD response is studied with a condensed-C-foil model. With the modified CCD responses, the unfolded spectra by TGS are shown, and the significant C K edge decreases as the C foil thickness increases. Compared to the simulated C K edge depth, the me...
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- 2017
8. Radiative cooling induced plasma collapse observed in laser irradiation of a CH-tamped gold micro-disk
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Bo Deng, Yang Zhao, Xiayu Zhan, Bo Qing, Zheng Yuan, Min Lv, Gang Xiong, Yongkun Ding, Tuo Zhu, Jiamin Yang, Jiyan Zhang, Zhimin Hu, and Rongqing Yi
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Physics ,Physics and Astronomy (miscellaneous) ,Radiative cooling ,business.industry ,Collapse (topology) ,Plasma ,Laser ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Transverse plane ,Optics ,Cooling rate ,Physics::Plasma Physics ,law ,0103 physical sciences ,Irradiation ,Laser pulse duration ,Atomic physics ,010306 general physics ,business - Abstract
Time-resolved x-ray self-emission imaging was used to study the dynamic evolution of a laser-produced gold plasma tamped by plastic (CH), and a significant plasma collapse was observed during the laser irradiation. The plasma collapse, a kind of transverse contraction, has been ascribed to the radial compression caused by the different radiative cooling rates and thus different pressures between the central high-Z gold plasma and the surrounding low-Z CH plasma, and this has been reproduced by numerical simulations using the two-dimensional radiation-hydrodynamics code Multi2D. The experimental results represent an observation of the radiative cooling induced plasma jet within a 1 ns laser pulse duration, much more quickly than those reported previously. In addition, our experiment design may offer a method to study the radiative cooling rates of high-Z plasmas. The measured cooling rate is a factor of 2 higher than the theoretical result [Post et al., At. Data Nucl. Data Tables 20, 397 (1977)], but is wi...
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- 2017
9. Fluorescence based imaging for M-band drive symmetry measurement in hohlraum
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Li Yao, Min Lv, Yang Zhao, Sanwei Li, Guohong Yang, Xiayu Zhan, Zheng Yuan, Bo Deng, Qi Li, Jin Li, Minxi Wei, Zhimin Hu, Jiyan Zhang, Jiamin Yang, Longfei Jing, Bo Qing, Jun Li, Yongkun Ding, Tuo Zhu, Yimeng Yang, Gang Xiong, Chengwu Huang, and Chunxiao Su
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Physics ,business.industry ,media_common.quotation_subject ,Physics::Optics ,Plasma ,Radiation ,Condensed Matter Physics ,Laser ,01 natural sciences ,Asymmetry ,Corona ,Fluorescence ,010305 fluids & plasmas ,law.invention ,Optics ,law ,Hohlraum ,0103 physical sciences ,Plasma diagnostics ,Atomic physics ,010306 general physics ,business ,media_common - Abstract
We describe an experimental technique to measure the drive symmetry of M-band radiation on the capsule in hohlraum. M-band radiation from the corona of the laser-produced gold plasma, especially the laser spot regions in the cavity, was used to pump x-ray fluorescence of a thin layer of Si-tracer coated on a solid CH-ball. The fluorescence images were time resolvedly recorded by an x-ray framing camera and the drive asymmetry due to M-band radiation was deduced from these fluorescence images. Moreover, a Si-doped gold cavity was used with the initial purpose of maximizing the fluorescence signal through resonance transitions. Since the Si-plasma expands more rapidly than the gold-plasma, the evolution of drive asymmetry was accelerated in Si-doped hohlraum.
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- 2016
10. Experimental study on the incident-angle-dependent laser coupling features of polystyrene targets
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Chengwu Huang, Tuo Zhu, Yunsong Dong, Xingsen Che, Yu Mei, Jiamin Yang, Huabing Du, Huiyue Wei, and Tian-Ming Song
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Materials science ,Backscatter ,Aperture ,business.industry ,Scattering ,Energy conversion efficiency ,Physics::Optics ,Plasma ,Nanosecond ,Condensed Matter Physics ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010305 fluids & plasmas ,law.invention ,Optics ,Physics::Plasma Physics ,law ,0103 physical sciences ,010306 general physics ,business ,Inertial confinement fusion ,Mathematical Physics - Abstract
Laser-produced plasmas have attracted great interest due to their potential utility in wide-ranging applications, especially in the field of inertial confinement fusion (ICF). For direct-driven ICF, laser coupling with polystyrene targets is a crucial and fundamental problem. In addition, oblique incidence is also a common phenomenon for laser facilities with multiple beams. It is necessary to evaluate the effects of oblique incidence on the laser coupling features relevant to the direct-driven ICF. Experiments using an intense nanosecond flat-top laser at around W cm–2 to irradiate polystyrene planar targets from three different incidence angles have been performed on the Shenguang-III prototype laser facility. The time-integrated absolute values of the full aperture backscatter (FABS), near backscatter scattering (NBS), and the x-ray conversion efficiency (CE) have been measured quantitatively. According to the experimental results, with the increase of the incidence angle, the percentage of the stimulated Brillouin backscatter and the overall x-ray CE decreased while the stimulated Raman backscatter fraction rose. Theoretical analyses based on hydrodynamic simulations and linear theory were qualitatively consistent with the experimental results. In addition, the specularly reflected light was also observed at 30° laser oblique incidence.
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- 2016
11. Experimental demonstration of laser to x-ray conversion enhancements with low density gold targets
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Xiayu Zhan, Wanli Shang, Yunsong Dong, Feng Wang, Mei Yu, Bo Deng, Liang Guo, Baohan Zhang, Riccardo Betti, Wenhai Zhang, Jiamin Yang, Shenye Liu, Yongkun Ding, Zhichao Li, Shaoen Jiang, Sanwei Li, Chengwu Huang, Tuo Zhu, and Ruizhen Yu
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Physics and Astronomy (miscellaneous) ,law ,Chemistry ,0103 physical sciences ,X-ray ,Low density ,Atomic physics ,010306 general physics ,Laser ,01 natural sciences ,010305 fluids & plasmas ,law.invention - Abstract
The enhancement of laser to x-ray conversion efficiencies using low density gold targets [W. L. Shang, J. M. Yang, and Y. S. Dong, Appl. Phys. Lett. 102, 094105 (2013)] is demonstrated. Laser to x-ray conversion efficiencies with 6.3% and 12% increases are achieved with target densities of 1 and 0.25 g/cm3, when compared with that of a solid gold target (19.3 g/cm3). Experimental data and numerical simulations are in good agreement. The enhancement is caused by larger x-ray emission zone lengths formed in low density targets, which is in agreement with the simulation results.
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- 2016
12. Design and experimental study of a secondary hohlraum radiation source with laser focal spots blocked
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Chengwu Huang, Feng Wang, Tianming Song, Zhichao Li, Huan Zhang, Tao Xu, Jiamin Yang, Peng Xiaoshi, and Tuo Zhu
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Shock wave ,Physics ,business.industry ,Radiation ,Condensed Matter Physics ,Laser ,01 natural sciences ,Velocity interferometer system for any reflector ,010305 fluids & plasmas ,law.invention ,Optics ,law ,Hohlraum ,Secondary emission ,0103 physical sciences ,Shielded cable ,Astronomical interferometer ,010306 general physics ,business - Abstract
A design of secondary hohlraum radiation source with laser focal spots blocked is introduced. The hard x-ray radiation such as the gold M-band emission and hot electrons from the coronal plasma were designed to be shielded using a cylindrical shield. Three-dimensional view factor analysis was carried out to optimize the shield structure to achieve higher radiation temperature. An experiment was performed at Shenguang III prototype laser facility to verify the design. Velocity Interferometer System for Any Reflector was used to measure the shock wave speed in a three-stepped Al sample driven by this radiation source and the peak radiation temperature of the radiation source was estimated to be about 90 eV.
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- 2016
13. Observation of hydrodynamic processes of radiation-ablated plasma in a small hole
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Zhiwei Lin, H. C. Zhang, Hang Li, Shenye Liu, Tuo Zhu, Jianhua Zheng, Longyu Kuang, Jiamin Yang, Ruizhen Yu, Shaoen Jiang, Jian Zheng, Bin Zhao, Guang-yue Hu, Tianming Song, and Yongkun Ding
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Physics ,business.industry ,Plasma ,Radiation ,Condensed Matter Physics ,Laser ,law.invention ,Optics ,Physics::Plasma Physics ,Hohlraum ,law ,Plasma diagnostics ,Area density ,Atomic physics ,business ,Electronic band structure ,Inertial confinement fusion - Abstract
In the hohlraum used in laser indirect-drive inertial confinement fusion experiments, hydrodynamic processes of radiation-ablated high-Z plasma have a great effect on laser injection efficiency, radiation uniformity, and diagnosis of hohlraum radiation field from diagnostic windows (DW). To study plasma filling in the DWs, a laser-irradiated Ti disk was used to generate 2–5 keV narrow energy band X-ray as the intense backlighter source, and laser-produced X-ray in a hohlraum with low-Z foam tamper was used to heat a small hole surrounded by gold wall with 150 μm in diameter and 100 μm deep. The hydrodynamic movement of the gold plasma in the small hole was measured by an X-ray framing camera and the results are analyzed. Quantitative measurement of the plasma areal density distribution and evolution in the small hole can be used to assess the effect of plasma filling on the diagnosis from the DWs.
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- 2015
14. Detection of plasma produced in the interaction between an Nd:YAG laser and a metal-nitride-oxide-semiconductor-type charge-coupled device
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Jian-Ping Chen, Jian Lu, Xiaowu Ni, Zhonghua Shen, Yixin Zhang, and Tuo Zhu
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Distributed feedback laser ,Materials science ,business.industry ,Plasma ,Nitride ,Condensed Matter Physics ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,X-ray laser ,Optics ,law ,Nd:YAG laser ,Charge-coupled device ,Electrical and Electronic Engineering ,business ,Microwave - Abstract
In this paper, the interaction process of a high-power Q-switched YAG laser and a metal–nitride–oxide–semiconductor (MNOS)-type charge-coupled device (CCD) is studied with the help of the plasma shape and structure under the repeated actions of laser pulses. Mach–Zehnder interferograms of plasmas and related experimental results produced by a 1064 nm laser beam with a pulse width of 15 ns acting upon the MNOS-type CCD are obtained. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 160–162, 1997.
- Published
- 1997
15. A simple method to verify the opacity and equation of state of high-Z plasmas
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Jiamin Yang, W. Y. Zhang, Tuo Zhu, Shiyang Zou, Guangwei Meng, Min Wang, and Jinghong Li
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Physics ,Equation of state ,Opacity ,Plasma ,Radiation ,Condensed Matter Physics ,Laser ,law.invention ,Computational physics ,law ,Simple (abstract algebra) ,Z-pinch ,Atomic physics ,Inertial confinement fusion - Abstract
Accurate opacity and equation of state (EOS) data are important parameters for reliable modeling and understanding many phenomena of high energy density physics. However, they are difficult to obtain either theoretically or experimentally especially for high-Z plasmas. In this paper, we proposed a simple method to verify the opacity and EOS of high-Z plasmas in rarefactive states, which is build on the two key aspects of ablation processes, i.e., the propagation of heatwave into materials and the hydrodynamic expansion of the blow-off plasmas. Based on the integrated analysis of the Au foil burnthrough and foam-confined plasma expansion experiments performed on the Shenguang II and Shenguang III prototype laser facilities, we suggested two semi-empirical multipliers to adjust the opacity and EOS of Au plasma. These adjusted opacity and EOS may then provide a foundation for other radiation hydrodynamic simulations under similar drive conditions.
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- 2013
16. K -Shell Spectra from CH Foam Tamped Ti Layers Irradiated with Nanosecond Laser Pulses
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Chengwu Huang, Tianming Song, Guohong Yang, Yang Zhao, Minxi Wei, Zhimin Hu, Wanli Shang, Gang Xiong, Jiyan Zhang, Jiamin Yang, and Tuo Zhu
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Electron density ,Materials science ,Analytical chemistry ,Electron shell ,General Physics and Astronomy ,chemistry.chemical_element ,Plasma ,Laser ,law.invention ,chemistry ,Transition metal ,law ,Irradiation ,Emission spectrum ,Titanium - Abstract
Hot dense titanium plasma was produced by irradiating a CH foam coated titanium layer with nanosecond laser pulses. The time-integrated emission spectra of He-like titanium were measured by using an absolutely calibrated flat crystal spectrometer. The synthetic spectra obtained by the steady collisional-radiative (CR) equilibrium model associated with the hydrodynamic simulations were compared with the experimental spectra. The results show that the electron density increases up to 5 × 1021 cm−3 with CH foam of density 40 mg/cc. This work indicates that an overlay of CH foam on a solid target is beneficial to create an optimum condition for K-shell emissions from a high density plasma region.
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- 2012
17. Beneficial effect of CH foam coating on x-ray emission from laser-irradiated high-Z material
- Author
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Shuanggui Li, Jiamin Yang, Tuo Zhu, and Yan Xu
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Physics ,business.industry ,Energy conversion efficiency ,X-ray ,engineering.material ,Condensed Matter Physics ,Laser ,law.invention ,Optics ,Coating ,Hohlraum ,Thermal radiation ,law ,engineering ,Irradiation ,Composite material ,business ,Layer (electronics) - Abstract
Laser-irradiated Au layer with CH foam coating is investigated numerically. It is found that when coated with under-critical density CH foam more thermal radiation is produced, while less radiation is produced when coated with over-critical density CH foam. The under-critical density CH foam coating, which is heated supersonically and volumetrically by lasers, hampers the expansion of high-Z plasma and helps increase the density and temperature of Auplasma in the radiation zone. It is a practical and simple way to increase the laser x-ray conversion efficiency of hohlraum by coated with low-Z foam of under-critical density. This idea is tested with an experiment in an analogous geometry. The line emission from laser-irradiated Ti layer coated with CH foam was measured, and the increment of x-ray when coated with under-critical density CH foam was found.
- Published
- 2011
18. One-dimensional space resolving flat-field holographic grating soft x-ray framing camera spectrograph for laser plasma diagnostics
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Guohong Yang, Gang Xiong, Hang Li, Jiyan Zhang, Wanli Shang, Minxi Wei, Zhimin Hu, Jiamin Yang, Yang Zhao, and Tuo Zhu
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Physics ,Spectrometer ,Holographic grating ,Opacity ,business.industry ,Holography ,Grating ,law.invention ,Optics ,law ,Blazed grating ,Optoelectronics ,Spectral resolution ,business ,Instrumentation ,Spectrograph - Abstract
A 1D space resolving x-ray spectrum diagnostic system has been developed to study the radiation opacity of hot plasma on SG-II laser facility. The diagnostic system consists of a 2400 lines/mm flat-field holographic grating and a gated microchannel plate coupled with an optical CCD and covers the wavelength range of 5-50 Å. The holographic grating was compared with a ruled one by measuring the emission spectra from a laser-produced molybdenum plasma. The results indicate that the holographic grating possesses better sensitivity than the ruled grating having nearly similar spectral resolution. The spectrograph has been used in radiative opacity measurement of Fe plasma. Simultaneous measurements of the backlight source and the transmission spectrum in appointed time range in one shot have been accomplished successfully with the holographic grating spectrometer. The 2p-3d transition absorption of Fe plasma near 15.5 Å in has been observed clearly.
- Published
- 2011
19. Studies of the focus of holographic grating and its applications
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Tuo Zhu and Steen Grüner Hanson
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Physics ,Wavefront ,Diffraction ,Holographic grating ,business.industry ,Optical engineering ,Holography ,Grating ,law.invention ,Optics ,law ,business ,Focus (optics) ,Diffraction grating - Abstract
We present a result of studying holographic grating focus both in theory and experiment. It is based on a geometric analysis of a point source grating, through a detailed study of a typical holographic grating we show the grating focus place and its possible application.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
- Published
- 1993
20. Experimental study of the hydrodynamic trajectory of an x-ray-heated gold plasma
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Jiamin Yang, Xiaoan He, Yaonan Ding, Yongkun Ding, Jinhong Li, Yan Xu, Tuo Zhu, Guangwei Meng, Rongqing Yi, Zhiming Hu, Jiyan Zhang, and Shenye Liu
- Subjects
Physics ,law ,Thermal radiation ,X-ray ,Plasma diagnostics ,Plasma ,Atomic physics ,Radiation ,Condensed Matter Physics ,Laser ,Trajectory (fluid mechanics) ,law.invention ,Line (formation) - Abstract
Hydrodynamic processes of radiation-ablated high-Z plasmas have great influence on the x-ray radiation transport both in a high-Z tube with low-Z foam filling and in a low-Z filling indirect drive cavity. Using the intense x-ray radiation to heat a low-Z foam-tamped high-Z gold plate from a half cavity, the hydrodynamic moving process of the x-ray-ablated gold plasma has been studied by an imaging method with Ti He-α line emission as the backlighter source. The hydrodynamic trajectory of the x-ray-heated gold plasma was obtained and the average trajectory velocity of (36.5±1.2) km/s was derived. The experimental trajectory was compared with the simulations using the one-dimensional (1D) RDMG [P. Gu et al., Sci. China, Ser. G 48, 345 (2005)] and two-dimensional (2D) LARED-R [K. Lan et al., Laser Part. Beams 23, 275 (2005)] codes separately. It is shown that the 2D LARED-R code simulated the measured plasma trajectory much better than the 1D RDMG code due to the fact that the lateral x-ray radiation loss wa...
- Published
- 2010
21. Note: X-ray streak camera sweep speed calibration
- Author
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Bo Deng, Dong Yang, Tuo Zhu, Xiaoan He, Jiamin Yang, and Zhebin Wang
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Physics ,Streak camera ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Streak ,Pulse duration ,Laser ,law.invention ,Optics ,law ,Calibration ,Charge-coupled device ,Transient (oscillation) ,business ,Instrumentation ,Inertial confinement fusion - Abstract
X-ray streak cameras are extensively used to study transient x-ray processes in experiments carried out on various laser facilities at the Research Center of Laser Fusion. Precise calibration and clear description of the sweep speed of the x-ray streak camera are vital for obtaining precise temporal information to understand the fast physics phenomena. An x-ray streak camera named wide-slit x-ray streak camera has been calibrated using a small-scale laser facility with pulse duration of 8 ps. Sweep speeds on most part of the output screen (charge coupled device) are obtained. These calibration results can be used to correct the nonlinearity of sweep speed in measurement of temporal processes.
- Published
- 2010
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