用于高能中微子探测的岩盐射电传播测量
Measurements of radio propagation in rock salt for the detection of high-energy neutrinos
摘要：
我们目前的测量无线电/微波脉冲通过盐在科特布兰奇盐矿由北美盐业公司在圣玛丽教区，路易斯安那州。这些结果来自西南地区1500英尺的数据。(457 m）在我们第三次也是最近一次访问矿井时，矿井的深层。我们从三个垂直钻孔内发射和接收了一个快速，高功率，宽带脉冲，这些钻孔钻到100英尺深。(30 m）和200 ft.低于1500英尺。使用带宽跨度为125至900 MHz的三对不同的偶极天线进行水平测量。通过测量间隔为50 m和169 m的钻孔之间接收到的脉冲的相对强度，我们推导出归因于盐介质的信号的衰减。我们将衰减的频率依赖性拟合为幂律，并发现最佳拟合场衰减长度在150 MHz时为93 \pm 7 m，在300 MHz时为63 \pm 3 m，在800 MHz时为36 \pm 2 m。这是迄今为止对天然盐层中无线电衰减的最精确测量。我们评估这种测量的影响，为未来的中微子探测器在盐。
英文摘要：
We present measurements of the transmission of radio/microwave pulses through salt in the Cote Blanche salt mine operated by the North American Salt Company in St. Mary Parish, Louisiana. These results are from data taken in the southwestern region of the 1500 ft. (457 m) deep level of the mine on our third and most recent visit to the mine. We transmitted and received a fast, high-power, broadband pulse from within three vertical boreholes that were drilled to depths of 100 ft. (30 m) and 200 ft. below the 1500 ft. level using three different pairs of dipole antennas whose bandwidths span 125 to 900 MHz. By measuring the relative strength of the received pulses between boreholes with separations of 50 m and 169 m, we deduce the attenuation of the signal attributed to the salt medium. We fit the frequency dependence of the attenuation to a power law and find the best fit field attenuation lengths to be 93 \pm 7 m at 150 MHz, 63 \pm 3 m at 300 MHz, and 36 \pm 2 m at 800 MHz. This is the most precise measurement of radio attenuation in a natural salt formation to date. We assess the implications of this measurement for a future neutrino detector in salt.
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