Investigation of the Energy Confinement in Ohmic and LHCD Plasmas in HT-7

Investigation of the energy confinement in ohmic and lower hybrid current drive （LHCD） plasmas in HT-7 has been performed. In ohmic discharges at low densities the global energy confinement time rE increases almost linearly with the density, saturates at a critical density （2.5×10^13/cm^3 for HT-7） and is nearly constant at higher densities. The energy confinement time is in good agreement with the Neo-Alcator scaling law at different densities and currents. In the LHCD plasmas the global energy confinement time similar to that of the L-mode discharges has been observed to be in good agreement with the low confinement mode （L mode） scaling law of ITER89-P in higher electron density and plasma current.     

一个通用的并行函数库

并行程序的设计在思路和方法上与串行程序有着本质的差别,其开发难度也比较大。为此,设计开发了一个通用的函数库来降低并行程序的开发难度。该函数库以MPI为基础,对并行程序开发中的常用功能进行了封装,具有一定的通用性。该函数库可以大大简化MPI并行程序的开发。并从区域分解、数组下标和循环变量的转换、数据交换和全局规约、输入输出等几个方面对该函数库进行了介绍,然后以数值求解二维拉普拉斯方程为例介绍了使用该函数库将串行程序改为并行程序的方法和步骤。目前已经成功地将其应用到风暴潮数值模式的并行化中,取得了较好的效果。     

运用Visual Basic实现PC与89C51 单片机之间的串行通信

在Visual Basic开发环境下,运用VB提供的通信控件,实现PC机与89C51单片机之间的串行通信.     

Experimental Results of MHD Suppression with Modulated LHCD on the HT-7 Tokamak

Modulation of lower hybrid current drive was used successfully to suppress MHD activity. This was achieved in discharges with MHD m = 2 tearing modes during the discharge conditions Ip = 110 kA, Bt = 1.75 T, ne0 - 1.1 ×1013 cm-3. The delivering time of LHCD pulse is less then 30 μs. The amplitude, interval and the period of LHCD modulation pulse can be adjusted very conveniently. The modulation LHCD can be delivered very fast at any time during the discharge. The modulation LHCD period was always much shorter than the plasma resistive time (Tη≈100 ms). So the profile of plasma current is changed much faster than the plasma resistive time. The different forms of LHCD modulating can be proved.     

大型超导托卡马克装置中的可编程控制器的应用设计

本文介绍了世界第三大超导托卡马克装置电源控制系统可编程控制器的应用设计，介绍了西门子Ｓ５－１３５Ｕ系列的软件编主外围硬件电路设计，对大型核聚变装置及类似的控制系统设计有一定的参考价值。     

基于RIA的EAST数据采集远程控制系统的设计

随着EAST实验水平不断提高,用户对EAST数据采集控制系统提出了更高的要求;基于RIA (Rich Internet Applications富因特网应用程序)的EAST数据采集远程控制系统采用B/S结构:使用基于Flex的富因特网应用程序作为采集控制系统的用户界面展现,采用一系列J2EE开源框架完成服务器端数据库处理;新采集控制系统在以下方面做出重大改进:多用户权限管理,远程个性化操作,针对性、实时性日志更新,友好的用户界面;测试表明新采集控制系统完全符合EAST实验数据采集的新要求.     

基于富因特网应用的EAST数据采集管理系统

随着EAST实验的进行,原有的基于C/S模式的采集管理系统已经不能满足多用户、易操作和易管理的需要。针对这些问题,本系统提出了基于富因特网应用的数据采集管理系统,实现了多用户按组分权限管理,当用户修改信息时,可以自动记录日志,并提示其他在线用户。同时,为了减少实验期间采集管理人员的负担,该系统实现故障自动恢复机制,故障严重时给管理员发送短信通知。经测试,该系统有效的实现了预期目标。     

新型变频晶闸管电源触发器

介绍一种基于工控机构成的、具有可跟踪电源频率的、一周期内多次改变α角的新型晶闸管触发控制器。它是一种新颖的智能化仪器,在实时控制领域具有很高的实用价值。     

风暴潮数值模式的并行化

实现了风暴潮数值模式基于MPI的并行化;根据该模式数值计算的特点提出了一种并行求解三对角方程组的新方法,相对于传统算法编程简单而且并行效率更高;负载平衡是并行程序性能优化首先要解决的问题,以水格点的个数作为任务分解的标准,实现了较好的负载平衡,相比水陆格点不作区分的分解方法性能有明显的提高;在SMP平台上使用8个CPU时加速比可以达到7.0,在集群平台上为6.5。     

Vertical Instability in EAST： Comparison of Model Predictions with Experimental Results

Growth rates of the axisymmetric mode in elongated plasmas in the experimental advanced superconducting tokamak （EAST） are measured with zero feedback gains and then compared with numerically calculated growth rates for the reconstructed shapes. The comparison is made after loss of vertical position control. The open-loop growth rates were scanned with the number of vessel eigenmodes, which up to 20 is enough to make the growth rates settled. The agreement between the growth rates measured experimentally and the growth rates determined numerically is good. The results show that a linear RZIP model is essentially good enough for the vertical position feedback control.