用于加速器的快速开关铁电材料
Fast Switching Ferroelectric Materials for Accelerator Applications
摘要：
介绍了最近研制的BST（M）（含镁基添加剂的钡锶钛氧化物）铁电材料的快开关（< 10纳秒）测量结果。这些材料可用作适用于高梯度加速器的新型先进技术组件的基础。铁电陶瓷具有依赖于电场的介电常数，该介电常数可以通过施加偏置电压来改变。铁电材料为线性对撞机应用提供了显著的优势，特别是对于需要<10纳秒的极短响应时间的开关和控制元件。测量结果表明，新型BST（M）陶瓷具有很高的可调谐系数：40-50 kV/cm的偏置场可使介电常数降低1.3-1.5倍。最近开发的大直径（110厘米）薄壁铁电环上的金偏压接触沉积技术允许在见证样品实验中的几纳秒开关时间。铁电环可以在高脉冲功率（几十兆瓦）下用于X波段组件，以及在几千瓦范围内的高平均功率下用于L波段移相器，正在开发用于ILC射频耦合的优化。加速器应用包括快速有源X波段和Ka波段高功率铁电开关、高功率X波段和L波段移相器以及可调介质加载加速结构。
英文摘要：
Fast switching (< 10 nsec) measurement results on the recently developed BST(M) (barium strontium titanium oxide composition with magnesium-based additions) ferroelectric materials are presented. These materials can be used as the basis for new advanced technology components suitable for high-gradient accelerators. A ferroelectric ceramic has an electric field-dependent dielectric permittivity that can be altered by applying a bias voltage. Ferroelectric materials offer significant benefits for linear collider applications, in particular, for switching and control elements where a very short response time of <10 nsec is required. The measurement results presented here show that the new BST(M) ceramic exhibits a high tunability factor: a bias field of 40-50 kV/cm reduces the permittivity by a factor of 1.3-1.5. The recently developed technology of gold biasing contact deposition on large diameter (110 cm) thin wall ferroelectric rings allowed ~few nsec switching times in witness sample experiments. The ferroelectric rings can be used at high pulsed power (tens of megawatts) for X-band components as well as at high average power in the range of a few kilowatts for the L-band phase-shifter, under development for optimization of the ILC rf coupling. Accelerator applications include fast active X-band and Ka-band high-power ferroelectric switches, high-power X-band and L-band phase shifters, and tunable dielectric-loaded accelerating structures.
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