SGER: Exploratory Investigation of Simulation of Solar Plasma with Accelerated Compact Toroid

SGER：利用加速紧凑环形线圈模拟太阳等离子体的探索性研究

• 批准号: 0135347
• 负责人: David Hwang
• 金额: $ 2.94万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0135347&HistoricalAwards=false
• 关键词: SGER; Exploratory; Investigation; Simulation; Solar

The investigators will generate magnetic plasmoids that can excite non-linear processes relevant to solar and inter planetary plasmas. The main effort is to develop the laboratory diagnostics capable of measuring the non-linear processes and to develop theoretical and computer models of the physical processes and their relevancy to solar and interplanetary plasmas. The Spheromak-like compact toroid (SCT) is a magnetized blob of ionized material (plasmoid) with self-generated equilibrium magnetic field structures that can confine the plasma over its lifetime of several tens of microseconds. This type of plasmoid is of great interest in laboratory magnetic fusion experiments and its development has been supported through DOE projects. One of the unique properties of the SCT is that it can withstand a tremendous accelerating force, so high speed (over 100 km/sec) can be reached in relatively short distance. Therefore, SCT accelerators are fairly compact and easily usable in laboratory experiments. In the past, one of the drawbacks of the SCT accelerator is the limit on its repetition rate by lack of high power repeatable switches. The low rate limits the use of this apparatus in physics experiment where statically meaningful database is required in a reasonable time frame. The investigators have now developed and operated a repeatable SCT accelerator using passive switching. At present, the pulse rate has increased from one per minute to one every 5 seconds. Improvement in the gas valve system will increase the rate to over 100 Hz. Moreover, the reliability of the accelerator has achieved over 1000 shots at the .2 Hz rate. Laboratory plasmas have the distinct advantage that its physical parameters can be carefully controlled and dynamic processes can be precisely diagnosed. Neither of these is possible with astrophysical plasmas.

研究人员将产生磁性等离子体，可以激发与太阳和行星间等离子体相关的非线性过程。主要工作是发展能够测量非线性过程的实验室诊断，并发展物理过程及其与太阳和行星际等离子体的相关性的理论和计算机模型。球状环状物（SCT）是一种磁化的电离物质（等离子体），具有自生成的平衡磁场结构，可以在几十微秒的寿命内限制等离子体。这种类型的等离子体在实验室磁聚变实验中引起了极大的兴趣，它的发展得到了美国能源部项目的支持。SCT的独特特性之一是它可以承受巨大的加速力，因此可以在相对较短的距离内达到高速（超过100公里/秒）。因此，SCT加速器相当紧凑，易于在实验室实验中使用。在过去，SCT加速器的缺点之一是由于缺乏高功率可重复开关而限制了其重复率。在物理实验中，需要在合理的时间框架内建立有意义的静态数据库，但由于速率低，限制了该设备的使用。研究人员现在已经开发并操作了一种使用无源开关的可重复SCT加速器。目前，脉冲率已从每分钟一次增加到每5秒一次。气体阀系统的改进将使速率提高到100赫兹以上。此外，加速器的可靠性已达到1000次以上。2hz速率。实验室等离子体具有明显的优势，它的物理参数可以被仔细控制，动态过程可以被精确诊断。这两种情况在天体物理等离子体中都不可能发生。