Resonant Antenna for Monitoring Gravitational Wave Bursts in our Galaxy

用于监测银河系中引力波爆发的谐振天线

• 批准号: 05402004
• 负责人: KURODA Kazuaki
• 金额: $ 7.3万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05402004/
• 关键词: Gravitational Wave; Resonant Antenna; Laser Transducer; General Relativity; 一般相対性理論; 銀河系; 超新星爆発; 2重中性子星合体; ファブリーペロー干渉計; スタック型防振装置; 不動点支持

In the first year of this project, almost all hardware are completed ; a vacuum chamber containing an resonant oscillator made of aluminum alloy weighing 1.8 tone, vibration-isolation stacks for supporting the antenna, vacuum monitoring system, main frame of a laser transducer and so on. Specifications of these parts were experimentally confirmed and checked. During the course of these experiments we confirmed the correctness of supporting through a nodal point to keep high mechanical Q of the antenna and we found a simple formula to design the stack isolation system. We also found a knowledge about outgassing of polymer material that is harmful to ultra high vacuum. Finding an enormous thermal noise originating in diffused resonance in membranes of a hinge mechanism for the laser transducer, we could not help changing the hinge to a pendulum which would bring more difficulties in this development. In the final year, we mounted the laser transducer on the antenna and tested its sensitivity both in the air and in the vacuum. During these test we had troubles which made a delay in this project : one is a failure of a laser source of YAG laser pumped by laser diode, which stopped the experiment for three months. The second is that it was not easy to set the pendulum stable by feedback with a frequency band far below the observational frequency, which reacked 4 kHz. For data acquisition we adopted a VME bus with a work station computer and developed several software for continuous operation of the antenna.In conclusion we developed the planed detector and obtained a technique to attain the initial end, we have not fully finished in the point of sensitivity, though. In the next year, we start its continuous operation and try to reach the expected sensitivity.

在项目的第一年，几乎所有的硬件都完成了，包括一个真空室，里面有一个1.8tone的铝合金谐振振荡器，用于支撑天线的隔振叠层，真空监测系统，激光换能器的主框架等等。这些部件的规格都通过实验确认和检查。在实验过程中，我们证实了通过节点支撑以保持天线的高机械Q的正确性，并找到了设计叠层隔离系统的简单公式。我们还发现了对超高真空有害的聚合物材料放气的知识。由于激光换能器的铰链机构在膜片中产生的扩散共振引起了巨大的热噪声，我们不得不将铰链改为钟摆，这将给激光换能器的研制带来更大的困难。在最后一年，我们将激光传感器安装在天线上，并在空气和真空中测试其灵敏度。在实验过程中，我们遇到了一些问题，导致了项目的延迟：一个是激光二极管泵浦的YAG激光器的激光源发生故障，使实验停止了三个月。第二，通过远低于观测频率的频带（达到4 kHz）的反馈来稳定摆是不容易的。在数据采集方面，我们采用了VME总线和工作站计算机，并开发了几种天线连续工作的软件。总之，我们开发了平面探测器，并获得了一种达到初始目标的技术，但在灵敏度方面还没有完全完成。在接下来的一年里，我们开始连续运行，并试图达到预期的灵敏度。

项目成果

K.Kuroda and K.Shimizu: "Buckiling of a vibration-isolation stack for gravity wave detedtors" Review of Scientific Instrument. 65. 1017-1018 (1993)

K.Kuroda 和 K.Shimizu：“重力波探测器隔振堆栈的屈曲”科学仪器评论。

Kazuaki Kuroda: "Buckling of a vibration-isolation stack for gravity wave detectors" Review of Physical Instruments.(94.4月発表予定). (1994)

Kazuaki Kuroda：“重力波探测器振动隔离堆栈的屈曲”物理仪器评论。（计划于 1994 年 4 月出版）（1994 年）。

Kazuaki Kuroda: "Resonant antenna for monitoring gravitational wave bursts in our Galaxy" Frontiers of Neutrino Astrophysics edited by Y.Suzuki and K.Nakamura. 589-589 (1993)

Kazuaki Kuroda：“用于监测银河系引力波爆发的谐振天线”中微子天体物理学前沿，由 Y.Suzuki 和 K.Nakamura 编辑。

K.Kuroda and K.Shimizu: "Buckiling of a vibration-isolation stack for gravity wave detectors" Rev.of Sci.Instr.65. 1017-1018 (1993)

K.Kuroda 和 K.Shimizu：“重力波探测器振动隔离堆栈的屈曲”Rev.of Sci.Instr.65。