Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors
Abstract Sensitivity to ultra-high-energy neutrinos ( E > 17 eV) can be obtained cost-efficiently by exploiting the Askaryan effect in ice, where a particle cascade induced by the neutrino interaction produces coherent radio emission that can be picked up by antennas. As the near-surface ice prop...
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crioppubl:10.1088/1748-0221/18/01/p01036 2024-06-02T08:07:37+00:00 Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors Beise, J. Glaser, C. 2023 http://dx.doi.org/10.1088/1748-0221/18/01/p01036 https://iopscience.iop.org/article/10.1088/1748-0221/18/01/P01036 https://iopscience.iop.org/article/10.1088/1748-0221/18/01/P01036/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0/ https://iopscience.iop.org/info/page/text-and-data-mining Journal of Instrumentation volume 18, issue 01, page P01036 ISSN 1748-0221 journal-article 2023 crioppubl https://doi.org/10.1088/1748-0221/18/01/p01036 2024-05-07T13:57:02Z Abstract Sensitivity to ultra-high-energy neutrinos ( E > 17 eV) can be obtained cost-efficiently by exploiting the Askaryan effect in ice, where a particle cascade induced by the neutrino interaction produces coherent radio emission that can be picked up by antennas. As the near-surface ice properties change rapidly within the upper ????(100 m), a good understanding of the ice properties is required to reconstruct the neutrino properties. In particular, continuous monitoring of the snow accumulation (which changes the depth of the antennas) and the index-of-refraction n ( z ) profile are crucial for an accurate determination of the neutrino's direction and energy. We present an in-situ calibration system that extends the radio detector station with two radio emitters to continuously monitor the firn properties within the upper 40 m by measuring the time differences between direct and reflected (off the surface) signals (D'n'R). We determine the optimal positions of two transmitters at all three sites of current and future in-ice radio detectors: Greenland, Moore's Bay, and the South Pole. For the South Pole we find that the snow accumulation Δ h can be measured with a resolution of 3 mm and the parameters of an exponential n ( z ) profile α and z 0 with 0.04% and 0.14% precision respectively, which constitutes an improvement of more than a factor of 10 as compared to the inference of the n ( z ) profile from density measurements. Additionally, as this technique is based on the measurement of the signal propagation times we are not bound to the conversion of density to index-of-refraction. We quantify the impact of these ice uncertainties on the reconstruction of the neutrino vertex, direction, and energy and find that the calibration device measures the ice properties to sufficient precision to have negligible influence. Article in Journal/Newspaper Greenland South pole IOP Publishing Greenland South Pole Journal of Instrumentation 18 01 P01036 |
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Abstract Sensitivity to ultra-high-energy neutrinos ( E > 17 eV) can be obtained cost-efficiently by exploiting the Askaryan effect in ice, where a particle cascade induced by the neutrino interaction produces coherent radio emission that can be picked up by antennas. As the near-surface ice properties change rapidly within the upper ????(100 m), a good understanding of the ice properties is required to reconstruct the neutrino properties. In particular, continuous monitoring of the snow accumulation (which changes the depth of the antennas) and the index-of-refraction n ( z ) profile are crucial for an accurate determination of the neutrino's direction and energy. We present an in-situ calibration system that extends the radio detector station with two radio emitters to continuously monitor the firn properties within the upper 40 m by measuring the time differences between direct and reflected (off the surface) signals (D'n'R). We determine the optimal positions of two transmitters at all three sites of current and future in-ice radio detectors: Greenland, Moore's Bay, and the South Pole. For the South Pole we find that the snow accumulation Δ h can be measured with a resolution of 3 mm and the parameters of an exponential n ( z ) profile α and z 0 with 0.04% and 0.14% precision respectively, which constitutes an improvement of more than a factor of 10 as compared to the inference of the n ( z ) profile from density measurements. Additionally, as this technique is based on the measurement of the signal propagation times we are not bound to the conversion of density to index-of-refraction. We quantify the impact of these ice uncertainties on the reconstruction of the neutrino vertex, direction, and energy and find that the calibration device measures the ice properties to sufficient precision to have negligible influence. |
format |
Article in Journal/Newspaper |
author |
Beise, J. Glaser, C. |
spellingShingle |
Beise, J. Glaser, C. Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
author_facet |
Beise, J. Glaser, C. |
author_sort |
Beise, J. |
title |
Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
title_short |
Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
title_full |
Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
title_fullStr |
Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
title_full_unstemmed |
Simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
title_sort |
simulation study for an in-situ calibration system for the measurement of the snow accumulation and the index-of-refraction profile for radio neutrino detectors |
publisher |
IOP Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1088/1748-0221/18/01/p01036 https://iopscience.iop.org/article/10.1088/1748-0221/18/01/P01036 https://iopscience.iop.org/article/10.1088/1748-0221/18/01/P01036/pdf |
geographic |
Greenland South Pole |
geographic_facet |
Greenland South Pole |
genre |
Greenland South pole |
genre_facet |
Greenland South pole |
op_source |
Journal of Instrumentation volume 18, issue 01, page P01036 ISSN 1748-0221 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-0221/18/01/p01036 |
container_title |
Journal of Instrumentation |
container_volume |
18 |
container_issue |
01 |
container_start_page |
P01036 |
_version_ |
1800752727269048320 |