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Taking into account the time behavior of laser power errors in the Laser MegaJoule robustness study 考虑激光功率误差的时间行为,进行激光兆焦耳鲁棒性研究
Pub Date : 2003-12-12 DOI: 10.1117/12.537396
J. Giorla, F. Poggi
In the Laser MegaJoule indirect drive experiments, the time-averaged radiation asymmetry on a Deuterium-Tritium (DT) capsule must be minimized to achieve high-yield implosions. A two-dimensional model estimates the time-averaged effect of power imbalance, laser beam pointing and target fabrication errors on the final DT deformation, which is then submitted to an ignition threshold. As these errors will take random values from one LMJ shot to another, the robustness study aims at quantifying the probability of failing to reach ignition. Here, we focus on laser power imbalance. We distinguish two types of error sources in laser performance, according to whether they take long-time (more than the laser pulse duration) or short-time (less than the laser pulse duration) correlated values. Indeed, as the final DT deformation results from the whole laser pulse history, the failure probability depends on the error time-correlation. A 1D-time model of the laser beam power, from the front-end to the target, was developed to quantify the variations of the output power imbalance due to the source contributions. Taking into account this detailed time behavior, instead of modeling all errors as long-time correlated values, leads to cut the global effect of power imbalance on ignition probability by half.
在激光百万焦耳间接驱动实验中,为了实现高产量的内爆,必须最小化氘-氚(DT)胶囊上的时间平均辐射不对称性。二维模型估计了功率不平衡、激光束指向和目标制造误差对最终DT变形的时间平均影响,然后将其提交到点火阈值。由于这些误差从一次LMJ射击到另一次LMJ射击将取随机值,因此鲁棒性研究旨在量化未达到点火的概率。在这里,我们关注激光功率不平衡。我们区分了两种类型的激光性能误差源,根据他们是否采取长时间(大于激光脉冲持续时间)或短时间(小于激光脉冲持续时间)相关值。实际上,由于最终的DT变形是整个激光脉冲历史的结果,因此失效概率取决于误差的时间相关性。建立了从前端到目标的激光功率的一维时间模型,以量化由于源的贡献而导致的输出功率不平衡的变化。考虑到这种详细的时间行为,而不是将所有误差建模为长时间相关值,可以将功率不平衡对点火概率的整体影响减少一半。
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引用次数: 1
Amplification of acoustic oscillations by short laser pulses due to fast heating of electrons 由于电子的快速加热,用短激光脉冲放大声振荡
Pub Date : 2003-12-12 DOI: 10.1117/12.537383
Y. V. Afanasiev, B. Chichkov, V. Isakov, A. P. Kanavin, S. A. Uryupin
It is shown that heating of electrons due to the inverse bremsstrahlung absorption of high-power short-pulse laser radiation results in parametric generation of ion-acoustic waves. The range of wave numbers where the amplitude of the ion-acoustic oscillations increases by more than an order of magnitude is determined.
结果表明,高功率短脉冲激光辐射的逆轫致吸收使电子受热,导致离子声波的参数化产生。确定了离子声振荡幅度增加超过一个数量级的波数范围。
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引用次数: 0
Laser-produced post-pulse crater formation in solids observed in PALS facility interaction experiment 在PALS装置相互作用实验中观察到的固体激光脉冲后坑形成
Pub Date : 2003-12-12 DOI: 10.1117/12.536517
I. Y. Doskach, S. Gus'kov, K. Jungwirth, M. Kalal, A. Kasperczuk, B. Králiková, E. Krouský, J. Limpouch, K. Mašek, M. Pfeifer, T. Pisarczyk, K. Rohlena, V. Rozanov, J. Skála, J. Ullschmied
Results from PALS facility laser-massive Al target interaction experiments are reported. Main attention is devoted craters formation under the action of laser pulses of various energy (from 100 J up to 600 J), intensity (from 1013 W/cm2 up to 1015 W/cm2), laser wavelength (0.438 μm and 1.315 μm), and focal beam radius (from 35 μm up to 600 μm). Crater replicas were made of wax and their depths and radii were subsequently obtained by microscopy measurements. Duration of the laser-pulse-initiated shock wave propagation into the targets was much longer than that of the laser pulse itself (400 ps). This was an important feature of the experimental arrangement. Theoretical model of the post-pulse crater formation by the shock wave propagating and decaying in solids after the end of the laser pulse is presented and applied for explanation of the results obtained in experiments.
报道了PALS装置激光与大质量铝靶相互作用实验的结果。主要研究了激光脉冲能量(100j ~ 600j)、强度(1013 W/cm2 ~ 1015 W/cm2)、波长(0.438 μm ~ 1.315 μm)、聚焦光束半径(35 μm ~ 600 μm)等不同激光脉冲作用下的弹坑形成。陨石坑的复制品是用蜡制成的,它们的深度和半径随后通过显微镜测量得到。激光脉冲引发的冲击波传播到目标的持续时间比激光脉冲本身的传播时间(400 ps)长得多。这是实验安排的一个重要特点。提出了激光脉冲结束后冲击波在固体中传播衰减形成脉冲后弹坑的理论模型,并应用该模型对实验结果进行了解释。
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引用次数: 5
Skin depth theory for nonlinear-force driven block ignition laser-ICF based on anomalous picosecond terawatt laser-plasma interaction 基于异常皮秒太瓦激光等离子体相互作用的非线性力驱动块点火激光icf的趋肤深度理论
Pub Date : 2003-12-12 DOI: 10.1117/12.536769
H. Hora, J. Badziak, F. Boody, R. Hoepfl, K. Jungwirth, B. Králiková, J. Krása, L. Laska, M. Pfeifer, K. Rohlena, P. Parys, J. Skála, J. Ullschmied, J. Wołowski, E. Woryna
The experiment of Badziak et al has shown that irradiation of copper by 1.5 ps laser pulses produced 50 times lower maximum ion energies than the 22 MeV expected after relativistic self focusing from laser pulses of about ns duration. This discrepancy was confirmed in the following reported experiments specifically designed for this clarification, where MeV Au+30 maximum ion energies needed 400 times higher intensity with ps pulses than with 0.5 ns pulses. Comparing the theory for generating the fastest ions by relativistic self focusing and of the second fastest group by a quiver-collision model, we arrived at the conclusion that the mentioned ps-TW-generated ions are not following these usual theories but that a skin depth model with exclusion of relativistic self focusing explains the experiments. The essential importance is the suppression of the prepulse. We conclude how the experiment by Norreys et al. with the highest ever reported fusion gains may be increased to fusion reactor conditions if our results of prepulse control and suppression of relativistic self focusing would be applied following our skin layer interaction model. This extends the fast ignitor to the nonlinear-force block ignition without plasma precompression.
Badziak等人的实验表明,1.5 ps激光脉冲照射铜产生的最大离子能量比持续约ns的激光脉冲相对论性自聚焦后预期的22 MeV低50倍。这种差异在以下专门为澄清而设计的实验中得到了证实,其中MeV Au+30的最大离子能量需要比0.5 ns脉冲高400倍的强度。通过比较相对论自聚焦产生最快离子的理论和振动碰撞模型产生第二快离子的理论,我们得出结论,上述ps- tw产生的离子不是遵循这些通常的理论,而是一个排除相对论自聚焦的皮肤深度模型来解释实验。最重要的是抑制预脉冲。我们的结论是,如果我们的预脉冲控制和抑制相对论性自聚焦的结果将应用于我们的皮肤层相互作用模型,那么Norreys等人所进行的具有有史以来最高聚变增益的实验可能会增加到聚变反应堆条件。这将快速点火器扩展到没有等离子体预压缩的非线性力块点火。
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引用次数: 3
Laser generated high-pressure shock wave experiments and their simulations 激光产生高压激波的实验与模拟
Pub Date : 2003-12-12 DOI: 10.1117/12.534320
V. Senecha, M. Shukla, B. K. Godwal, H. C. Pant
Laser driven shock wave experiments were performed to study the equation of state (EOS) of Cu material using impedance-matching technique with Al as reference material. An Nd:YAG laser chain (2 Joule, 1.06 μm wavelength, 200 ps pulse FWHM) was used for generating shocks in the planar Al foils and Al-Cu layered targets. EOS of materials at shock pressure up to 11 Mbar is obtained with pressure enhancement by a factor of 1.67 at Al-Cu interface. Numerical simulations performed using one-dimensional radiation hydrodynamic code MULTI show close agreement with the experimental value of shock pressure enhancement. Simulation reveals the fact that 5 - 6 μm thickness of Al foil as a reference material is sufficient to prevent the x-ray preheating effect as well as to attain planar and steady shock wave propagation for a given laser beam used in the experiment. The experimental Hugoniot data points obtained are in excellent agreement with the existing standard SESAME data and with other reported experimental results.
采用阻抗匹配技术,以Al为参比材料,进行了激光驱动激波实验,研究了Cu材料的状态方程。利用Nd:YAG激光链(2焦耳,波长1.06 μm,脉冲FWHM 200ps)在平面Al箔和Al- cu层状靶上产生激波。在冲击压力高达11 Mbar时,材料的EOS在Al-Cu界面上的压力增加了1.67倍。利用一维辐射流体动力代码MULTI进行的数值模拟结果与激波压力增强的实验值吻合较好。仿真结果表明,对于实验中使用的给定激光束,5 ~ 6 μm厚度的Al箔作为基准材料足以防止x射线的预热效应,并达到平面和稳定的冲击波传播。获得的Hugoniot实验数据点与现有的标准SESAME数据和其他报道的实验结果非常吻合。
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引用次数: 1
Dependence of the hydrogen permeability of glasses on thermal expansion and the structure connectedness factor 玻璃的氢渗透性与热膨胀和结构连通系数的关系
Pub Date : 2003-12-12 DOI: 10.1117/12.537287
E. Medvedev
All glass properties are dependent by their structure. It was established that hydrogen permeation, characterized by lgKH as one of properties, is determined on the factor of glass network connectedness and the thermal expansion coefficient, which confirm the existing of free structure volume. Equations have been obtained for calculation of 1gKH. They may be applied for predicting the changes in hydrogen permeability as a function of the indicated criterions.
玻璃的所有性能都取决于它们的结构。建立了以lgKH为表征的氢渗透是由玻璃网连通性和热膨胀系数决定的,证实了自由结构体积的存在。得到了1gKH的计算公式。它们可以用来预测氢渗透率的变化,作为指示标准的函数。
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引用次数: 0
Electron acceleration by few-cycle laser pulse with single-wavelength spot size 单波长光斑尺寸的少周期激光脉冲的电子加速
Pub Date : 2003-12-12 DOI: 10.1117/12.536958
G. Dudnikova, V. Bychenkov, A. Maksimchuk, G. Mourou, J. Nees, S. G. Bochkarev, V. Vshivkov
Generation of relativistic electrons from the interaction of a laser pulse with a high density plasma foil, accompanied by an underdense preplasma in front of it, has been studied with 2D particle-in-cell (PIC) simulations for pulse duration comparable to a single-cycle and for single-wavelength spot size. The primary mechanism responsible for electron acceleration is identified. Simulations show that the energy of the accelerated electrons has a maximum versus the pulse-duration for relativistic laser intensities. The most effective electron acceleration takes place when the preplasma scale length is comparable to the pulse-duration. Electron distribution functions have been found from PIC simulations. Their tails are well approximated by Maxwellian distributions with a hot temperature in the MeV range.
利用二维粒子池(PIC)模拟研究了激光脉冲与高密度等离子体箔相互作用产生的相对论性电子,并在其前面伴有低密度的预等离子体,其脉冲持续时间可与单周期和单波长光斑大小相媲美。确定了导致电子加速的主要机制。模拟结果表明,在相对论激光强度下,加速电子的能量随脉冲持续时间的变化有一个最大值。最有效的电子加速发生在等离子体前尺度长度与脉冲持续时间相当的时候。从PIC模拟中发现了电子分布函数。它们的尾巴很好地近似于麦克斯韦分布,温度在MeV范围内。
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引用次数: 0
Reduction of the spatial coherence of a laser beam propagating in an underdense semicollisional plasma 在低密度半碰撞等离子体中传播的激光束空间相干性的降低
Pub Date : 2003-12-12 DOI: 10.1117/12.537090
P. Michel, C. Labaune, G. Bonnaud, J. Fuchs, H. Bandulet, S. Depierreux, G. Riazuelo, F. Walraet
Within the context of inertial confinement fusion, experiments involving the "self-induced smoothing" of a laser beam propagating in an underdense semicollisional plasma are presented. These results, which reveal severe modifications of the focal spot intensity pattern via increased angular spreading and hot spot size reduction, are compared with three-dimensional simulations from the code PARAX.
在惯性约束聚变的背景下,提出了激光光束在低密度半碰撞等离子体中传播的“自诱导平滑”实验。这些结果表明,通过增加角扩散和减小热点尺寸,焦点光斑强度模式发生了严重的变化,并与PARAX代码的三维模拟结果进行了比较。
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引用次数: 0
2D-Lagrangian code LATRANT for simulation radiation gas dynamic problems 模拟辐射气体动力学问题的二维拉格朗日代码LATRANT
Pub Date : 2003-12-12 DOI: 10.1117/12.536544
E. Aristova, A. Iskakov, I. Lebo, V. Tishkin
United algorithm LATRANT for a simulation of a radiative gas flows in 2D cylindrical geometry has been developed on the basis of the gas-dynamic code ATLANT and the program for the radiation transport calculation LATRA. The developed program takes into account the radiation transport in the multi-group approximation and the gas dynamics within the framework of the improved Lagrangian method. Two modifications of LATRANT code for spherical and plane problems in r-z geometry respectively have been developed. A quasi-one-dimensional simulation of the heating and compression of a two-layer spherical target irradiated by isotropic X-rays has been carried out to demonstrate qualitative difference between LATRANT and three-temperature approximation results. Essentially 2D simulation of compression of the same target by the angular-nonhomogeneous radiation has revealed fuel preheating and radiative symmetrization of the inner shell compression, which are typical for the indirect compression schemes. Transition of infrared radiation to X-rays has been observed in 2D simulation of plain Al foil acceleration by Nd laser pulse.
在气体动力学代码ATLANT和辐射输运计算程序LATRA的基础上,提出了二维圆柱形辐射气体流动模拟的统一算法LATRANT。该程序考虑了多群近似下的辐射输运和改进拉格朗日方法框架内的气体动力学。提出了两种分别适用于球面和平面几何问题的LATRANT代码的修正。本文对各向同性x射线辐照下两层球形目标的加热和压缩过程进行了准一维模拟,证明了LATRANT近似结果与三温度近似结果的质的区别。利用非均质角辐射对同一目标进行压缩的二维模拟,揭示了间接压缩方案中典型的燃料预热和内壳压缩辐射对称现象。用Nd激光脉冲对平面铝箔进行二维加速模拟,观察到红外辐射向x射线的转变。
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引用次数: 6
Study of properties and preparation conditions of plasmochemical SiO2 films 等离子体化学SiO2薄膜的性能及制备条件研究
Pub Date : 2003-12-12 DOI: 10.1117/12.537457
V. M. Izgorodin, Yu. V. Tolokonnikova, A. A. Aushev, A. I. Vasil'eva, V. G. Gogolev, A. F. Kovylov, E. G. Orlikova, I. G. Sevrugin
The results of research of properties and preparation conditions of the plasmochemical SiO2 films are submitted. These films coated various substrates (glass, metals, NaCl). Film deposition was carried out by decomposition of the tetraethoxycilane vapor by the electrical discharge with the frequency of about 18 kHz. The excessive products of decomposition were pumped out with maintenance of the tetraethoxycilane vapor and argon pressure of about 0.2 Torr. The study of element structure has shown that the film represents SixOy with x ≈ 1 and y ≈ 2 and contains an impurity of organic inclusions. Density and index of refraction of a coating are close to these parameters for glass SiO2. The form of the film surface is investigated depending on the coating conditions. Infrared spectra of absorption and Raman spectra are investigated. The results of attempts of the iodine in this film as an impurity are given. This method is applied for preparing of the covering with uniform thickness on glass microspheres used as targets in laser fusion experiments on the installation "Iskra-5."
介绍了等离子体化学SiO2薄膜的性能和制备条件的研究结果。这些薄膜涂覆各种基底(玻璃、金属、NaCl)。采用频率约为18 kHz的放电对四乙氧基香烷气相进行分解,形成薄膜。在保持四乙氧基香烷蒸汽和约0.2 Torr的氩气压力的条件下,泵出过量的分解产物。元素结构研究表明,该薄膜为x≈1和y≈2的SixOy,含有有机夹杂物杂质。涂层的密度和折射率与玻璃SiO2的这些参数接近。根据不同的涂层条件,研究了薄膜表面的形状。研究了红外吸收光谱和拉曼光谱。本文给出了该薄膜中碘作为杂质的试验结果。该方法应用于“以色列-5”装置激光聚变实验靶用玻璃微球表面均匀厚度覆盖物的制备。
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引用次数: 0
期刊
European Conference on Laser Interaction with Matter
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