PMT Test Facility at MPIK Heidelberg and Double Chooz Super Vertical Slice

Proceedings supplement for conference poster at Neutrino 2010, Athens, Greece

Transit Time and Charge Correlations of Single Photoelectron Events in R7081 PMTs

During the calibration phase of the photomultiplier tubes (PMT) for the Double Chooz experiment the PMT response to light with single photoelectron (SPE) intensity was analysed. With our setup we were able to measure the combined transit time and charge response of the PMT and therefore we could deconstruct and analyse all physical effects having an influence on the PMT signal. Based on this analysis charge and time correlated probability density functions were developed to include the PMT response in a Monte Carlo simulation.Comment: minor changes by referee reques

Transit Time and Charge Correlations of Single Photoelectron Events in R7081 PMTs

During the calibration phase of the photomultiplier tubes (PMT) for the Double Chooz experiment the PMT response to light with single photoelectron (SPE) intensity was analysed. With our setup we were able to measure the combined transit time and charge response of the PMT and therefore we could deconstruct and analyse all physical effects having an influence on the PMT signal. Based on this analysis charge and time correlated probability density functions were developed to include the PMT response in a Monte Carlo simulation.Comment: minor changes by referee reques

Background, Sensitivity and Directionality Studies for the Double Chooz Experiment

The goal of the Double Chooz experiment is the measurement of the neutrino oscillation angle theta13. So far, only an upper limit for its magnitude is known. Two reactors of a nuclear power plant at the French Chooz village provide a source of electron antineutrinos, whose ux is measured with a near and far detector. While the far detector is sensitive to neutrino oscillation, the near detector minimizes different systematic errors. In spring 2011 the far detector will start collecting data, while the near detector will follow roughly 18 months later. For the sensitivity of the experiment it is crucial to minimize the systematic error. Therefore, knowledge on background events is important. In this thesis the different sources of background are characterized and the eciency of various rejection techniques is investigated. Furthermore, different options to determine the background rate from the experimental data are analyzed. The inuence of different background rates on the sensitivity of Double Chooz is calculated. Another central aspect of this thesis is the directional reconstruction of neutrino events. It is demonstrated that the direction of the two reactors can be resolved with neutrino events within the rst few months. This thesis designs a precise reconstruction of neutrino directions and thus provides an important benchmark for the applicability of future large scale scintillator experiments in both geo- and astrophysics

Experimente zur Ionisation von atomarem Wasserstoff im Ionenstoß

In spite of the profound theoretical understanding of the correlated quantum dynamics in atomic or molecular collisions, significant discrepancies were observed quite recently between experimental data for single ionization of helium in collisions with fast C6+- projectiles and all theoretical models. A modern imaging spectrometers was used in this experiment, which allowed to cover completely new geometries of the momentum phase-space of the collision fragments. One of the problems that arise in the theoretical treatment is to appropriately describe the role and the importance of the second helium electron. Therefore, it is advantageous to use atomic hydrogen as a target in experiments. This diploma thesis describes the best available theoretical models to explain the new experimenal data as well as the generation of atomic hydrogen as a target for ion collision measurements. In addition, differential and even fully differential cross sections for ionization of atomic hydrogen by C4+-projectiles will be presented and interpreted taking into account the experimental resolution by means of a Monte-Carlo simulation

Afterpulse Measurements of R7081 Photomultipliers for the Double Chooz Experiment

We present the results of afterpulse measurements performed as qualification test for 473 inner detector photomultipliers of the Double Chooz experiment. The measurements include the determination of a total afterpulse occurrence probability as well as an average time distribution of these pulses. Additionally, more detailed measurements with different light sources and simultaneous charge and timing measurements were performed with a few photomultipliers to allow a more detailed understanding of the effect. The results of all measurements are presented and discussed

Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment

The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu Photonics K.K. (HPK) is used in various experiments in particle and astroparticle physics. We describe the test and calibration of 474 PMTs for the reactor antineutrino experiment Double Chooz. The unique test setup at Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate 30 PMTs simultaneously and to characterize the single photo electron response, transit time spread, linear behaviour and saturation effects, photon detection efficiency and high voltage calibration

Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment

The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu Photonics K.K. (HPK) is used in various experiments in particle and astroparticle physics. We describe the test and calibration of 474 PMTs for the reactor antineutrino experiment Double Chooz. The unique test setup at Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate 30 PMTs simultaneously and to characterize the single photo electron response, transit time spread, linear behaviour and saturation effects, photon detection efficiency and high voltage calibration

Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment

The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu Photonics K.K. (HPK) is used in various experiments in particle and astroparticle physics. We describe the test and calibration of 474 PMTs for the reactor antineutrino experiment Double Chooz. The unique test setup at Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate 30 PMTs simultaneously and to characterize the single photo electron response, transit time spread, linear behaviour and saturation effects, photon detection efficiency and high voltage calibration

Afterpulse Measurements of R7081 Photomultipliers for the Double Chooz Experiment

We present the results of afterpulse measurements performed as qualification test for 473 inner detector photomultipliers of the Double Chooz experiment. The measurements include the determination of a total afterpulse occurrence probability as well as an average time distribution of these pulses. Additionally, more detailed measurements with different light sources and simultaneous charge and timing measurements were performed with a few photomultipliers to allow a more detailed understanding of the effect. The results of all measurements are presented and discussed