Investigation of the First Mirror on Tokamak

The study progress of NNSF in 2006 has been presented in this paper. The aim and plan of this item have been described briefly. Three test mirror exposure experiments have been done in this year. The main components of the deposited materials on the first mirror are carbon and iron analyzed by AES. The first mirror is polluted easier during glow discharge and wall processing than omhic discharge.     

Measurement of One— and Two—Neutron Transfers in Reaction of ^6He＋^9Be at 25MeV／u

The cross sections one-and two-neutron transfers induced by 6He at 25MeV/u on a^9Be target were measured in RIKEN.Clear identification of the recoiled Be isotopes was achieved.In total five 11Be and 371 ^10Be events,the corresponding two-and one-neutron transfers were obtained and analysed for transfer reaction cross sections.The results are useful to determine the spectroscopic factors of the internal halo structure of the 6He nucleus.     

介质中的核子–孩子碰撞截面及其对原子核反应总截面的影响

给出了一个在较大能量范围内描述介质中核子-核子碰撞截面的计算公式,并结合微观修正的Glauber模型,研究了介质效应对原子核反应总截面的影响.     

电荷对称破缺

1930年 ,物理学家海森伯曾认为 ,中子与质子实质上是在质量上具有微小差别的同一种粒子 ,他将两者统称为“核子” .近代的核物理学家赞同这样的观点 ,即在大量的核反应中 ,如果用中子来代替质子时 ,核反应过程将以相同方式继续进行下去 ,反之亦然 .但这种相似性在某些情况下会发生破坏 ,因为它将导致电荷对称破缺 ,简称为CSB .2 0 0 3年 4月 ,在美国费城召开的美国物理学会的会议上 ,有两个实验室分别独立地宣布 ,他们完成了对电荷对称破缺的实验观测 .一个是美国印第安那大学回旋加速器实验室 (IUCF) .IUCF的E .Stephenson教授宣…     

Application of Soft X-ray Tomography on HL-2A Tokamak

Soft X-ray emission from tokamak plasma is dependent on various plasma parameters, such as density and temperature, and one can thus infer information about them by observing this radiation. For multi-channel diagnostics, computed tomography is necessary to reconstruct the 2-D spatial distribution of the emission intensity g（r,θ） in a plasma. Therefore, soft X-ray tomography has become an important tool to study various phenomena in fusion plasma, such as sawtoothing, m = 1 precursor oscillation, snake, m ≥ 2 instabilities, and disruption, as well as plasma position, impurity radiation, etc.     

原子核形状演变的又一个特征指标E0跃迁及对102—110Pd偶偶核的应用

利用相互作用玻色子模型分别在U(5)—SU(3)和U(5)—O(6)描述下研究了^102—110Pd偶偶核的电单极跃迁.研究表明,这些偶偶Pd核能够用U(5)—SU(3)更好地描述.     

聚芴材料低能级发射现象及其机理研究现状

聚芴是一类重要的蓝光发射材料,有高亮度、高效率等优点;然而聚芴类材料在发光器件中使用一段时间之后,光致发光光谱在530～550 nm、电致发光光谱在2.2～2.3e V的区域出现新的发射带,使得器件的发射变成绿光或蓝绿光,在色度失纯的同时,器件的发光效率也迅速降低.本文概述了目前提出的有关聚芴材料低能级发射形成的原因的假说、试验依据、理论计算、以及基于假说所提出的消除低能级发射、改善材料发射稳定性的方法等研究现状.     

Edge Plasma Performance of Lower Hybrid Wave Injection on the HL-1M Tokamak

Recently, the L-mode to H-mode (L-H) transition in tokamak plasma confinement was found to be related to the presence of the poloidal flow shear near the plasma edge. An important mechanism is the ion orbit loss caused by interaction with the limiter. A complementary explanation is the generation of poloidal flows by plasma fluctuations via the Reynolds stress and the poloidal spin-up of plasmas from poloidal asymmetryof particle and momentum sources.