HL-2M环向场线圈电磁场和受力的计算分析

在建的HL-2M装置的环向场线圈采用了比特板式结构,介绍了采用封闭多边形电流丝模型计算分析HL-2M装置环向场线圈电磁场和纹波情况;环向场线圈电流与环向场引起的电磁力以及与极向场产生的倾覆力也做了计算。计算结果对环向场线圈的设计具有一定的参考意义。     

HL-2M极向场线圈电磁力的计算分析

在建的HL-2M装置的PF线圈采用了混合式结构。在放电过程中,线圈之间有很强的电磁耦合,每一个线圈都会受到很大电磁力的作用。采用解析法,在最大I_p=3MA等离子体电流和各种位形的放电条件下,计算分析了PF线圈受到的电磁力。这些计算结果对PF线圈及其支撑结构的设计都是具有参考价值的。     

氩气驱动液态锂回路的总体设计及初步运行结果

为了研究等离子体与自由液态锂表面相互作用的物理过程,建立了用氩气驱动的液态锂回路装置。介绍了建立的液态锂回路装置的组成部分、技术参数及运行原理。此回路主要由主回路、等离子体与液态锂相互作用试验段和单阴极高密度等离子体发生装置三部分组成。目前,此回路已取得一些初步的模拟结果和实验结果。     

HL-2M 主机线圈冷却系统设计和优化

用一维网络仿真和解析计算方法对HL-2M 磁体TF 线圈、PF 线圈和CS 线圈水冷却系统进行设计和计算,给出了冷却系统工程设计所需要的水力参数。通过优化冷却系统的资用压力和流量分配,得到满足子系统动力输出的最大流量为400m³•h⁻¹,最大压力为1.8MPa,满足线圈在最大流速4.5m•s⁻¹ 下热交换的要求。     

HL-2M 环向场线圈水冷数值模拟与分析

建立了环向场线圈的水冷计算模型,根据热传导和对流换热方程进行了数值模拟分析。计算结果表明：指形接头与铜板的界面接触热阻和接触电阻对指形接头的温升影响较大,但在平顶电流为140kA 及其电流平顶7s 时,由焦耳热引起的最高温升40℃以下,故环向场线圈的温度均不会超过80℃,且15min 后TF 线圈温度均降至30℃以下。在平顶电流为190kA 时,线圈通电持续时间可根据界面实测接触热阻、接触电阻以及线圈初始温度来确定。     

Structure change of 156Yb at high-spin states

High-spin states of ¹⁵⁶Yb have been studied via the ¹⁴⁴Sm(¹⁶O,4n)¹⁵⁶Yb fusion-evaporation reaction at beam energy 102~MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. The characteristics of the negative-parity sequence above the 25^－ state may related to the excitation from the nucleon in the Z=64, N=82 core. The E-GOS curve for the positive-parity yrast sequence in ¹⁵⁶Yb indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. The Cranked Woods-Saxon-Strutinsky calculations by means of Total-Routhian-Surface (TRS) methods has been made to understand this structure change.     

Shape evolution and test of the critical-point symmetry X(5) in 176Os

The lifetimes of excited states in the yrast band of ¹⁷⁶Os have been measured up to I=20h level using the Doppler shift attenuation method. The high-spin states of ¹⁷⁶Os were populated via fusion evaporation reaction ¹⁵²Sm(²⁸Si, 4n)¹⁷⁶Os at a beam energy of 140 MeV. The results support an X(5) structure for ¹⁷⁶Os at low spin. This structure disappears at high spin and shows a symmetry rotor character. The shape change of ¹⁷⁶Os is similar to that of ¹⁷⁸Os.     

Study of magnetic-rotation in ~(82)Rb by g-factor measurements

Magnetic rotation in ⁸²Rb has been investigated for the first time by g-factor measurement of intra-band states of the magnetic-rotational band built on the 11- state. The g-factors were measured by a TMF-IMPAD method and calculated by a semi-classical model of independent particle angular momentum coupling assumption. The g-factors and deduced shears angles decrease with the increasing of spin along the band, illustrating a step-by-step alignment of the valence protons and neutrons. The rapid alignment of the valence neutrons leads to a decrease of g-factors. The present results vividly reveal the shears mechanism of magnetic rotation.     

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利用TSC程序对HL-2M装置的纯欧姆放电参数进行了首次数值放电模拟,证实了极向场线圈系统具有实现预设的宏观等离子体参数的能力。数值放电模拟还利用基本的位移控制和等离子体电流控制系统实现了从孔栏位形到下单零偏滤器位形的稳定演变。模拟提供的一些主要结果为工程和物理目标设计提供重要的参考。     

柱前衍生高效液相色谱法分析海洋褐藻多糖药物的糖醛酸组成

采用三氟乙酸(TFA)分别将藻酸双酯钠(PSS)、甘糖酯(PMS)和古糖酯(PGS)3种海洋褐藻多糖药物进行降解,再与1-苯基-3-甲基-5-吡唑啉酮(PMP)进行柱前衍生,建立了3种药物糖醛酸组成分析的高效液相色谱方法.结果表明:PSS、PMS、PGS的最适降解条件:在110 ℃下降解6 h,TFA浓度3 mol/L;最适衍生条件:反应温度70 ℃,反应90 min,PMP与供试品的摩尔比为12∶ 1,NaOH与供试品的摩尔比为2∶ 1;色谱条件为:0.1 mol/L 磷酸盐(pH 6.7)缓冲液-乙腈(82∶ 18,V/V),检测波长:245 nm,流速:1 mL/min.在此色谱条件下,甘露糖醛酸(M)和古罗糖醛酸(G) 分离良好,测得PSS、PMS、PGS的M/G分别为2.37±0.05、6.60±0 22和0.22±0 03,该方法具有良好的精密度和重现性,灵敏度高,适合于海洋褐藻多糖类药物的微量分析.