742 research outputs found
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
Fiber technology applications for a future e+e- linear collider detector
The advantages and possibilities of fiber technology for the detection of
particles in 500 GeV e+e- reactions are considered. It is suggested to build a
fast trigger which could be used also for intermediate tracking. A fiber
preshower in front of the electromagnetic calorimeter would allow to identify
electrons and photons with a space precision better than 0.1 mm.Comment: 7 pages, 9 figures. Contributed to Workshop on Scintillating Fiber
Detectors (SCIFI97), Notre Dame, IN, 2-6 Nov 199
Introducing TAXI: a Transportable Array for eXtremely large area Instrumentation studies
A common challenge in many experiments in high-energy astroparticle physics
is the need for sparse instrumentation in areas of 100 km2 and above, often in
remote and harsh environments. All these arrays have similar requirements for
read-out and communication, power generation and distribution, and
synchronization. Within the TAXI project we are developing a transportable,
modular four-station test-array that allows us to study different approaches to
solve the aforementioned problems in the laboratory and in the field.
Well-defined interfaces will provide easy interchange of the components to be
tested and easy transport and setup will allow in-situ testing at different
sites. Every station consists of three well-understood 1 m2 scintillation
detectors with nanosecond time resolution, which provide an air shower trigger.
An additional sensor, currently a radio antenna for air shower detection in the
100 MHz band, is connected for testing and calibration purposes. We introduce
the TAXI project and report the status and performance of the first TAXI
station deployed at the Zeuthen site of DESY.Comment: 4 pages, 3 figures, presented at ARENA 2014, Annapolis, MD, June 201
Alternative Detection Methods for Highest Energy Neutrinos
Several experimental techniques are currently under development, to measure
the expected tiny fluxes of highest energy neutrinos above 10**18 eV. Projects
in different stages of realisation are discussed here, which are based on
optical and radio as well as acoustic detectors. For the detection of neutrino
events in this energy range a combination of different detector concepts in one
experiment seems to be most promising.Comment: 8 pages, 8 figures, to be published in Nuclear Physics B (Proceedings
Supplement): Proceedings of the XXIst International Conference on Neutrino
Physics and Astrophysics, Paris, June 14-19, 200
An effective method to read out large scintillator areas with precise timing
Using scintillator tile technology several square meters of plastic
scintillator are read out by only two photomultiplier with a time precision of
about 1.5 nsec.
Two examples are discussed to build a detector based on this technology to
search for cosmic muons and neutrinos.Comment: 8 pages, 9 figures. Contributed to Workshop on Scintillating Fiber
Detectors (SCIFI97), Notre Dame, IN, 2-6 Nov 199
Simulation of a Hybrid Optical/Radio/Acoustic Extension to IceCube for EeV Neutrino Detection
Astrophysical neutrinos at EeV energies promise to be an interesting
source for astrophysics and particle physics. Detecting the predicted
cosmogenic (``GZK'') neutrinos at 10 - 10 eV would test models of
cosmic ray production at these energies and probe particle physics at 100
TeV center-of-mass energy. While IceCube could detect 1 GZK event per
year, it is necessary to detect 10 or more events per year in order to study
temporal, angular, and spectral distributions. The IceCube observatory may be
able to achieve such event rates with an extension including optical, radio,
and acoustic receivers. We present results from simulating such a hybrid
detector.Comment: 4 pages, 2 figures; to appear in the Proceedings of the 29th ICRC,
Pune, Indi
Testrun results from prototype fiber detectors for high rate particle tracking
A fiber detector concept has been realized allowing to registrate particles
within less than 100 nsec with a space point precision of about 0.1 mm at low
occupancy. Three full size prototypes have been build by different producers
and tested at a 3 GeV electron beam at DESY. After 3 m of light guides 8-10
photoelectrons were registrated by multichannel photomultipliers providing an
efficiency of more than 99%. Using all available data a resolution of 0.086 mm
was measured.Comment: 18 pages, 17 figure
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