Results from phase 1 of the HAYSTAC microwave cavity axion experiment
Results from phase 1 of the HAYSTAC microwave cavity axion experiment
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DOI：
10.1103/physrevd.97.092001
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发表时间：
2018-03
影响因子：
5
通讯作者：
L. Zhong;S. Al Kenany;K. Backes;B. Brubaker;S. Cahn;G. Carosi;Y. Gurevich;W. Kindel;S. Lamoreaux;K. Lehnert;S. Lewis;M. Malnou;R. Maruyama;D. Palken;N. Rapidis;J. Root;M. Simanovskaia;T. Shokair;D. Speller;I. Urdinaran;K. Van Bibber
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文献类型：
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作者：
L. Zhong;S. Al Kenany;K. Backes;B. Brubaker;S. Cahn;G. Carosi;Y. Gurevich;W. Kindel;S. Lamoreaux;K. Lehnert;S. Lewis;M. Malnou;R. Maruyama;D. Palken;N. Rapidis;J. Root;M. Simanovskaia;T. Shokair;D. Speller;I. Urdinaran;K. Van Bibber
我们报告了在HAYSTAC实验中使用频率在5.6-5.8 $\, \rm Ghz$之间的微波腔探测器搜索暗物质轴子的结果。我们排除了具有双光子耦合的轴子模型$g_{a\gamma\gamma}\,\gtrsim\,2\times10^{-14}\,\rm GeV^{-1}$，在质量范围23.15 $\,<\,$$m_a \,$ < $\,$ 24.0 $\,\mu\rm eV$上比基准KSVZ模型高出2.7倍。这是我们之前报告的范围的两倍。我们通过在温度$T<h\nu/2k_B$下操作并结合约瑟夫森参数放大器（JPA）实现了近量子限制的灵敏度，改进了腔体的冷却，进一步将实验的系统噪声温度降低到其工作频率下的标准量子极限的两倍，比迄今为止任何其他暗物质微波腔实验都好一个数量级。这个结果结束了使用传统铜腔和单个JPA的HAYSTAC计划的第一阶段。
We report on the results from a search for dark matter axions with the HAYSTAC experiment using a microwave cavity detector at frequencies between 5.6-5.8$\, \rm Ghz$. We exclude axion models with two photon coupling $g_{a\gamma\gamma}\,\gtrsim\,2\times10^{-14}\,\rm GeV^{-1}$, a factor of 2.7 above the benchmark KSVZ model over the mass range 23.15$\,<\,$$m_a \,$<$\,$24.0$\,\mu\rm eV$. This doubles the range reported in our previous paper. We achieve a near-quantum-limited sensitivity by operating at a temperature $T<h\nu/2k_B$ and incorporating a Josephson parametric amplifier (JPA), with improvements in the cooling of the cavity further reducing the experiment's system noise temperature to only twice the Standard Quantum Limit at its operational frequency, an order of magnitude better than any other dark matter microwave cavity experiment to date. This result concludes the first phase of the HAYSTAC program utilizing a conventional copper cavity and a single JPA.