Combined Langmuir-magnetic probe measurements of type-Ⅰ ELMy filaments in the EAST tokamak

Detailed investigations on the filamentary structures associated with the type-I edge-localized modes(ELMs) should be helpful for protecting the materials of a plasma-facing wall on a future large device.Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak(EAST) using combined Langmuir-magnetic probes.The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 kms~(-1) in the far scrape-off layer(SOL) region.It is remarkable that the electron temperature of these filaments is detected to be ~50eV,corresponding to a fraction of 1/6 to the temperature near the pedestal top,while the density ~3×10~(19)m~(-3) of these filaments could be approximate to the line-averaged density.In addition,associated magnetic fluctuations have been clearly observed at the same time,which show good agreement with the density perturbations.A localized current on the order of ~100kA could be estimated within the filaments.     

用于超短强激光与气体靶相互作用实验的新型前置差分抽运系统

介绍了用于超短超强激光脉冲 -脉冲气体靶相互作用研究的新型差分抽运系统 ,与高效高分辨率大面积透射光栅光谱仪配合 ,进行了超短激光脉冲辐照下氩气喷靶的软 X射线发射特性的实验研究。实验表明 ,该谱仪有足够的灵敏度参与超短强激光脉冲辐照气体靶的软 X射线产生、X射线激光乃至高次谐波实验的软 X射线光谱诊断工作。     

HT-7托卡马克等离子体逃逸电子螺旋角散射研究

在托卡马克等离子体中,相同的等离子体电流条件下,若在较低的等离子体密度条件下发生反常多普勒共振,将会导致逃逸电子快螺旋角散射（FPAS）的发生;若在较高的等离子体密度条件下发生反常多普勒共振,则会导致逃逸电子正常螺旋角散射（NPAS）的发生。通过研究FPAS和NPAS条件下的逃逸电子行为,发现FPAS和NPAS均可一定程度增加逃逸电子的螺旋角,增加逃逸电子的同步辐射损失,减小逃逸电子的能量;且NPAS和FPAS对逃逸电子的影响主要集中在高能部分,对低能逃逸电子的影响较小。     

Combined Langmuir-magnetic probe measurements of type-I ELMy filaments in the EAST tokamak

Detailed investigations on the filamentary structures associated with the type-I edge-localized modes (ELMs) should be helpful for protecting the materials of a plasma-facing wall on a future large device. Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak (EAST) using combined Langmuir-magnetic probes. The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 km s^-1 in the far scrape-off layer (SOL) region. It is remarkable that the electron temperature of these filaments is detected to be ～50 eV, corresponding to a fraction of 1/6 to the temperature near the pedestal top, while the density (~3×10 ¹⁹ m ^-3) of these filaments could be approximate to the line-averaged density. In addition, associated magnetic fluctuations have been clearly observed at the same time, which show good agreement with the density perturbations. A localized current on the order of ～100 kA could be estimated within the filaments.     

高次谐波的双峰分裂现象

本文主要报道我们在强光光学开放研究实验室的 ４５ ｆｓ／５．４ ＴＷ钛宝石激光装置上进行高次谐波实验研究的一个最新结果． 当一个原子受到强激光场的作用时,会产生许多用传统的激扰理论无法解释的物理现象,高次谐波辐射正是这诸多强场物理现象中的一种．近几年来,无论在理论上,还是从实验上,人们一直对强场高次谐波辐射现象进行着广泛而深入的研究．一方面,利用高次谐波辐射可以获得可调谐的相干极紫外和软Ｘ射线辐射源;另一方面,利用高次谐波辐射还可以获得相干的极短脉冲．一般说来,当驱动激光场的强度为１０１４～１０１５…     

飞秒强激光作用下微毛细管等离子体X射线辐射特性

进行了超短强激光脉冲与玻璃微毛细管相互作用的探索性研究。对不同能量下 ,不同长度的玻璃毛细管的X射线谱进行了测量、分析。结果表明由于微毛细管的光导作用 ,随着微毛细管长度的增加 ,X射线的强度显著增强。利用复合辐射吸收边测量了作用过程中毛细管等离子体温度 ,表明随着激光能量增加电子温度升高     

SOLPS-ITER drift modeling of neon impurity seeded plasmas in EAST with favorable and unfavorable toroidal magnetic field direction

To better understand divertor detachment and asymmetry in the Experimental Advanced Superconducting Tokamak(EAST),drift modeling via the comprehensive edge plasma code SOLPS-ITER of neon impurity seeded plasmas in favorable/unfavorable toroidal magnetic field(BT) has been performed. Firstly, electrostatic potential/field(f/E) distribution has been analyzed, to make sure that f and E are correctly described and to better understand drift-driven processes. After that, drift effects on divertor det...     

低温等离子体灭菌实验研究

相对于传统的灭菌方法来讲,利用低温等离子体灭菌有许多优点。本文详细介绍了一个低温等离子体灭菌实验装置,并运用此装置对大肠杆菌和金黄色葡萄球菌进行了灭菌实验研究。通过对灭菌D值的比较发现大肠杆菌(革兰氏阴性菌)较之金黄色葡萄球菌(革兰氏阳性菌)易于灭杀。     

透射光栅谱仪光谱法测量ICF辐射温度

辐射温度是间接驱动ＩＣＦ研究中一个非常重要的参量。利用透射光栅谱仪,结合光谱还原技术对辐射温度进行测量,并对辐射输运过程作细致的研究。本文介绍了透射光栅光谱还原技术的一般方法,以及在重复频率脉冲激光等离子体Ｘ射线光源上进行ＸＵＶ二极管标定和光栅标定的一般过程。     

纳秒、飞秒激光脉冲下铝等离子体发射光谱及其空间特性的比较

研究了４５ ｆｓ和６ ｎｓ的强激光脉冲作用铝靶等离子体的发射光谱特性,发现在飞秒下Ｘ射线发射以Ｋ 壳层为主,等离子体的温度（５００ ｅＶ）,电子密度（３×１０２１／ｃｍ ３）比纳秒情况（１００ ｅＶ,２×１０２０／ｃｍ ３）下要高;铝等离子体的Ｘ射线发射长度短而且强区更靠近靶面。