The scan rate of an axion haloscope is proportional to the square of the cavity volume. In this paper, a new class of thin-shell cavities are proposed to search for axionic dark matter. These cavities feature active volume much larger (>20X) than that of a conventional cylindrical haloscope, comparable quality factor Q, and a similar frequency tuning range. Full 3D numerical finite-element analyses have been used to show that the TM_010 eigenmodes are singly polarized throughout the volume of the cavity and can facilitate axion-photon conversion in uniform magnetic field produced by a superconducting solenoid. To mitigate spurious mode crowding and volume loss due to localization, a pre-amplification binary summing network will be used for coupling. Because of the favorable frequency-scaling, the new cavities are most suitable for centimeter-wavelength (~ 10-100 GHz), corresponding to the promising post-inflation axion production window. In this frequency range, the tight machining tolerances required for high-Q thin-shell cavities are achievable with standard machining techniques for near-infrared mirrors.

中文翻译：

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用于轴子搜索的大体积厘米波腔

axion haloscope 的扫描速率与腔体积的平方成正比。在本文中，提出了一类新的薄壳腔来寻找轴离子暗物质。这些空腔具有比传统圆柱形占星镜大得多 (>20X) 的有效容积、可比的品质因数 Q 和相似的频率调谐范围。全 3D 数值有限元分析已被用于表明 TM_010 本征模式在整个腔体中是单极化的，并且可以促进超导螺线管产生的均匀磁场中的轴子-光子转换。为了减轻由于定位引起的伪模拥挤和体积损失，将使用预放大二进制求和网络进行耦合。由于有利的频率缩放，新腔最适合厘米波长（~ 10-100 GHz），对应于有希望的膨胀后轴子生产窗口。在这个频率范围内，使用近红外镜的标准加工技术可以实现高 Q 薄壳腔所需的严格加工公差。