Accelerator Measurements of the Askaryan effect in Rock Salt: A Roadmap Toward Teraton Underground Neutrino Detectors
Accelerator Measurements of the Askaryan effect in Rock Salt: A Roadmap Toward Teraton Underground Neutrino Detectors
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DOI：
10.1103/physrevd.72.023002
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发表时间：
2004-12
影响因子：
5
通讯作者：
P. Gorham;D. Saltzberg;R. Field;E. Guillian;R. Milincic;D. Walz;D. W. U. O. H. A. Manoa;Ucla;Stanford Linear Accelerator Center
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文献类型：
--
作者：
P. Gorham;D. Saltzberg;R. Field;E. Guillian;R. Milincic;D. Walz;D. W. U. O. H. A. Manoa;Ucla;Stanford Linear Accelerator Center
我们报告进一步SLAC测量的Askaryan效应：相干无线电发射的电荷不对称的电磁级联。我们使用合成岩盐作为介电介质，并在最终聚焦测试束处由GeV韧致辐射光子产生级联。我们将先前的发现测量扩展到更宽的参数空间范围，并探索对大规模超高能中微子探测器具有巨大潜在兴趣的电介质中的效应：岩盐（岩盐），它天然存在于高纯度地层中，在许多情况下含有数百立方公里的水当量质量。我们观察到强相干脉冲无线电发射的频率从0.2-15 GHz。通过埋设双极化天线的网格来确定线极化的高度，并跟踪簇射周围电场矢量方向随方位角的变化。在4个数量级的簇射能量的相干性。在UHF和微波频率的两个数量级上测试辐射的频率依赖性。我们还首次观测到了来自Askaryan电荷过剩的相干跃迁辐射，其结果与理论预言符合得很好。基于这些结果，我们对盐丘内的现实GZK中微子望远镜阵列进行了详细和保守的模拟，我们发现即使是最保守的GZK中微子模型，它每年也能探测到10个或更多的包含事件。«少
We report on further SLAC measurements of the Askaryan effect: coherent radio emission from charge asymmetry in electromagnetic cascades. We used synthetic rock salt as the dielectric medium, with cascades produced by GeV bremsstrahlung photons at the Final Focus Test Beam. We extend our prior discovery measurements to a wider range of parameter space and explore the effect in a dielectric medium of great potential interest to large scale ultra-high energy neutrino detectors: rock salt (halite), which occurs naturally in high purity formations containing in many cases hundreds of cubic km of water-equivalent mass. We observed strong coherent pulsed radio emission over a frequency band from 0.2-15 GHz. A grid of embedded dual-polarization antennas was used to confirm the high degree of linear polarization and track the change of direction of the electric-field vector with azimuth around the shower. Coherence was observed over 4 orders of magnitude of shower energy. The frequency dependence of the radiation was tested over two orders of magnitude of UHF and microwave frequencies. We have also made the first observations of coherent transition radiation from the Askaryan charge excess, and the result agrees well with theoretical predictions. Based on these results we have performed detailedmore » and conservative simulation of a realistic GZK neutrino telescope array within a salt-dome, and we find it capable of detecting 10 or more contained events per year from even the most conservative GZK neutrino models.« less