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The design study of IceCube DeepCore [Elektronische Ressource] : characterization and veto studies / put forward by Olaf Schulz

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The design study of IceCubeDeepCore: Characterization andveto studiesOlaf SchulzMax-Planck Institut fur KernphysikHeidelberg 2010Dissertationsubmitted to theCombined Faculties of the Natural Sciences and Mathematicsof the Ruperto-Carola-University of Heidelberg, Germanyfor the degree ofDoctor of Natural SciencesPut forward byOlaf Schulzborn in Hamburg, Germanyoral examination: 21.07.2010The design study of IceCube DeepCore:Characterization and veto studiesReferees: Privatdozent Dr. Konrad Bernl ohrProf. Dr. Christopher WiebuschAbstractIn this thesis the design study for the low energy extension to the IceCube neutrinotelescope, called DeepCore, is presented. IceCube and DeepCore are currently underconstruction at the geographic South Pole, Antarctica. With DeepCore the energythreshold of IceCube is signi cantly lowered, opening new possibilities to, e.g., improvelow-energy point source searches, to measure standard vacuum neutrino oscillationsand to increase the sensitivity to solar dark matter annihilation signals. In parallel tothe DeepCore design study a, software based, active atmospheric muon veto techniquehas been developed, which for the rst time, allows IceCube to measure neutrinos witha full sky (4) acceptance, although at a signi cantly reduced e ective volume.

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Published 01 January 2010
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The design study of IceCube
DeepCore: Characterization and
veto studies
Olaf Schulz
Max-Planck Institut fur Kernphysik
Heidelberg 2010Dissertation
submitted to the
Combined Faculties of the Natural Sciences and Mathematics
of the Ruperto-Carola-University of Heidelberg, Germany
for the degree of
Doctor of Natural Sciences
Put forward by
Olaf Schulz
born in Hamburg, Germany
oral examination: 21.07.2010The design study of IceCube DeepCore:
Characterization and veto studies
Referees: Privatdozent Dr. Konrad Bernl ohr
Prof. Dr. Christopher WiebuschAbstract
In this thesis the design study for the low energy extension to the IceCube neutrino
telescope, called DeepCore, is presented. IceCube and DeepCore are currently under
construction at the geographic South Pole, Antarctica. With DeepCore the energy
threshold of IceCube is signi cantly lowered, opening new possibilities to, e.g., improve
low-energy point source searches, to measure standard vacuum neutrino oscillations
and to increase the sensitivity to solar dark matter annihilation signals. In parallel to
the DeepCore design study a, software based, active atmospheric muon veto technique
has been developed, which for the rst time, allows IceCube to measure neutrinos with
a full sky (4) acceptance, although at a signi cantly reduced e ective volume.
Furthermore, in the course of the active atmospheric muon veto development, a new
opportunity has been discovered to also reduce the measured rate of atmospheric muon
neutrinos, a previously irreducible background to any search for extra-terrestrial neu-
trinos. This e ect has been analytically studied, independent of any detector design.
As of today, the rst data-taking period with full atmospheric muon veto capabilities
lies ahead. This thesis concludes with a rst look on early data taken with DeepCore
and a rst estimation of a sensitivity to a southern hemisphere point source.
Zusammenfassung
In dieser Arbeit wird die zentrale Design-Studie fur die Niedrig-Energie Erweiterung
\DeepCore", des IceCube Neutrino Teleskops, vorgestellt. IceCube und DeepCore
be nden sich derzeit im Bau am geographischen Sudp ol. Mit DeepCore wird die Energi-
eschwelle von IceCube signi kant gesenkt, was neue M oglichkeiten ero net um, unter
anderem, die Suche nach galaktischen Neutrino-Punktquellen zu optimieren, Neutrino-
Oszillationen in einem bisher nur grob vermessenen Energiebereich zu messen und eineh ohere Sensitivit at fur etwaige, durch Annihilation dunkler Materie induzierte, Neu-
trino Signale von der Sonne zu erreichen.
Parallel zu der DeepCore Design-Studie, wurde eine neuartige, Software-basierte, Tech-
nik entwickelt um den Hintergrund von atmosph arischen Myonen zu reduzieren (Myon-
Veto). Mit dieser Technik ist es IceCube erstmals m oglich im gesamten messbaren En-
ergiebereich nach Neutrinos aus der sudlic hen Hemisph are zu suchen, wenn auch mit
reduziertem e ektivem Volumen.
Desweiteren wurde, im Laufe der Entwicklung dieser Myon-Veto Technik, eine M oglichkeit
entdeckt, auch die gemessene Rate von atmosph arischen Neutrinos zu reduzieren. Diese
stellen einen bislang unreduzierbaren Hintergrund fur alle Suchen nach Neutrinos extra-
terrestrischen Ursprungs dar. Dieser E ekt wurde, unabh angig von einem etwaigen
Detektor-Design, analytisch untersucht.
Zum Zeitpunkt der Beendigung dieser Arbeit beginnt die erste Datennahme von Ice-
Cube mit DeepCore bei der die volle Myon-Veto Kapazit at zur Verfugung steht. Diese
Arbeit endet mit einem ersten Blick auf mit DeepCore genommene Daten und einer
ersten Absch atzung der Sensitivit at DeepCores zur Messung einer Punktquelle am
Sudhimmel.Fur Kathrin und Marleneii