180 research outputs found
The IceCube neutrino observatory: Status and initial results
The IceCube collaboration is building a cubic kilometer scale neutrino
telescope at a depth of 2 km at the geographic South Pole, utilizing the clear
Antarctic ice as a Cherenkov medium to detect cosmic neutrinos. The IceCube
observatory is complemented by IceTop, a square kilometer air shower array on
top of the in-ice detector. The construction of the detector is nearly finished
with 79 of a planned 86 strings and 73 of 80 IceTop stations deployed. Its
completion is expected in the winter 2010/11. Using data from the partially
built detector, we present initial results of searches for neutrinos from
astrophysical sources such as supernova remnants, active galactic nuclei, and
gamma ray bursts, for anisotropies in cosmic rays, and constraints on the dark
matter scattering cross section. Further, we discuss future plans and R&D
activities towards new neutrino detection techniques.Comment: Proceedings of ECRS 2010, Turku, Finland, August 201
Drilling deep in South Pole Ice
To detect the tiny flux of ultra-high energy neutrinos from active galactic
nuclei or from interactions of highest energy cosmic rays with the microwave
background photons needs target masses of the order of several hundred cubic
kilometers. Clear Antarctic ice has been discussed as a favorable material for
hybrid detection of optical, radio and acoustic signals from ultra-high energy
neutrino interactions. To apply these technologies at the adequate scale
hundreds of holes have to be drilled in the ice down to depths of about 2500 m
to deploy the corresponding sensors. To do this on a reasonable time scale is
impossible with presently available tools. Remote drilling and deployment
schemes have to be developed to make such a detector design reality. After a
short discussion of the status of modern hot water drilling we present here a
design of an autonomous melting probe, tested 50 years ago to reach a depth of
about 1000 m in Greenland ice. A scenario how to build such a probe today with
modern technologies is sketched. A first application of such probes could be
the deployment of calibration equipment at any required position in the ice, to
study its optical, radio and acoustic transmission properties.Comment: 4 pages, 3 figures, contribution to the Workshop ARENA2014, June 9-12
2014, Annapoli
A radio air shower surface detector as an extension for IceCube and IceTop
The IceCube neutrino detector is built into the Antarctic ice sheet at the
South Pole to measure high energy neutrinos. For this, 4800 photomultiplier
tubes (PMTs) are being deployed at depths between 1450 and 2450 meters into the
ice to measure neutrino induced charged particles like muons. IceTop is a
surface air shower detector consisting of 160 Cherenkov ice tanks located on
top of IceCube. To extend IceTop, a radio air shower detector could be built to
significantly increase the sensitivity at higher shower energies and for
inclined showers. As air showers induced by cosmic rays are a major part of the
muonic background in IceCube, IceTop is not only an air shower detector, but
also a veto to reduce the background in IceCube. Air showers are detectable by
radio signals with a radio surface detector. The major emission process is the
coherent synchrotron radiation emitted by e+ e- shower particles in the Earths
magnetic field (geosynchrotron effect). Simulations of the expected radio
signals of air showers are shown. The sensitivity and the energy threshold of
different antenna field configurations are estimated.Comment: 4 pages, 6 figures, to be published in Proceedings of the 30th
International Cosmic Ray Conferenc
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