• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fusion Engineering and Design >Mechanical design of the high-powered helicon antenna and stripline feed in the DⅢ-D Tokamak
【24h】

Mechanical design of the high-powered helicon antenna and stripline feed in the DⅢ-D Tokamak

机译：DⅢ-DTokamak大功率螺旋天线和带状线馈电的机械设计

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A high-powered "comb-line" helicon antenna for use within the DIII-D Tokamak is currently in design and fabrication at General Atomics. The antenna will drive current in high beta discharges using electromagnetic helicon waves. The high-powered helicon antenna (HPHA) is expected to couple up to one MW of power into DIII-D plasmas at a frequency of 476 MHz. The antenna design includes 30 individual, inductively coupled modules fastened to six internally water-cooled Inconel back-plates. The end modules have special design features to provide RF stripline feed attachment points. Each back-plate is mounted to a pedestal, which is secured to the vessel wall via a combination of studs and welded brackets. The mechanical design includes features to minimize and survive disruption forces, thermal loading from RF losses, vacuum vessel bake (350C), and installation considerations. Thermal stress design challenges include plasma heat loads, thermal ratcheting, and bake-out cycles that result in thermal growth differences between the stripline and the vessel. Splitting the back-plate into six sections each with a central pedestal support significantly reduces the disruption loads. A single stripline folded in half, fed near the fold provides a 180 degrees phase shift between the stripline module connections for driving the two module straps. This looped mono RF coaxial stripline design was chosen to enable using one feed-through, to optimize space limitations, ease of installation, structural rigidity, and RF tuning ability. The striplines are supported by a quarter-wavelength "stub", mid span, for support during thermal cycling and plasma disruption events. Multiphysics FEA analyses are performed to optimize the geometric shapes to meet the aforementioned design challenges. A description of the mechanical design, fabrication, installation, and analyses of the HPHA and stripline feeds will be presented.
机译：目前，General Atomics正在设计和制造DIII-D Tokamak中使用的大功率“梳状线”螺旋天线。天线将使用电磁螺旋波以高β放电驱动电流。高功率螺旋天线（HPHA）有望以476 MHz的频率将高达1 MW的功率耦合到DIII-D等离子体中。天线设计包括30个独立的电感耦合模块，这些模块固定在六个内部水冷Inconel背板上。终端模块具有特殊的设计功能，可提供RF带状线馈电连接点。每个背板均安装在一个基座上，该基座通过双头螺栓和焊接托架的组合固定在容器壁上。机械设计包括以下功能：最小化和承受破坏力，RF损耗造成的热负荷，真空容器烘烤（350C）和安装注意事项。热应力设计面临的挑战包括等离子热负荷，热棘轮运动和烘烤周期，这会导致带状线和容器之间的热增长差异。将背板分为六个部分，每个部分都有一个中央基座支撑，可以大大减少干扰负荷。一条折叠成两半的带状线，靠近折痕处进给，可在带状线模块连接之间提供180度的相移，以驱动两个模块带。选择这种环形单射频同轴带状线设计可以使用一个馈通，以优化空间限制，安装简便性，结构刚度和射频调谐能力。带状线由四分之一波长的“ stub”（中间跨度）支撑，用于在热循环和等离子体破坏事件期间提供支撑。进行多物理场FEA分析以优化几何形状，以满足上述设计挑战。将介绍HPHA和带状线进料的机械设计，制造，安装和分析。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号