Author: Richard James LewisPublisher:
ISBN:
Category : Neutrinos
Languages : en
Pages : 0
Book Description
Development of a Raman System for In-line Monitoring of Tritium at the Karlsruhe Tritium Neutrino (KATRIN) Experiment
Author: Richard James LewisPublisher:
ISBN:
Category : Neutrinos
Languages : en
Pages : 0
Book Description
Accurate Calibration of Raman Systems
Author: Magnus SchlösserPublisher: Springer
ISBN: 3319062212
Category : Science
Languages : en
Pages : 226
Book Description
Neutrinos can arguably be labeled as the most fascinating elementary particles known as their small but non-zero rest mass points to new mass generating mechanisms beyond the Standard Model, and also assigns primordial neutrinos from the Big Bang a distinct role in shaping the evolution of large-scale structures in the universe. The open question of the absolute neutrino mass scale will be addressed by the Karlsruhe Tritium Neutrino (KATRIN) experiment, currently under construction. This thesis reports major contributions to developing and implementing new laser-spectroscopic precision tools to continuously monitor the isotope content of the windowless gaseous tritium source of KATRIN. The method of choice, Raman spectroscopy, is ideally suited for in-situ monitoring of all six hydrogen isotopologues. In a series of beautiful experiments the author obtained two independent novel calibration methods, first based on a comparison of experimental Raman depolarization ratios with corresponding quantum-chemical calculations, and second on a gas sampling technique. Both methods yield consistent cross-calibration results and, as well as yielding improvements in precision, will be of major importance in reducing systematic effects in long-term neutrino mass measurements. The methods developed in this thesis also have great potential to further broaden the applications of Raman spectroscopy to study extended sources such as in atmospheric physics.
Accurate Calibration of Raman Systems
Author: Accurate Calibration of the Raman System for the Karlsruhe Tritium Neutrino Experiment
Author: Magnus Richard Hermann SchlösserPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A Spatially Resolved Study of the KATRIN Main Spectrometer Using a Novel Fast Multipole Method
Author: John Patrick Barrett (Ph. D.)Publisher:
ISBN:
Category :
Languages : en
Pages : 350
Book Description
The Karlsruhe Tritium Neutrino (KATRIN) experiment is intended to make a sensitive (~ 200 meV) model-independent measurement of the neutrino mass through high precision electrostatic spectroscopy of the tritium /-decay spectrum. One of the principle components in this experiment is the main spectrometer which serves as an integrating MAC-E filter with 0(1) eV resolution. Thorough understanding of the transmission properties of the main spectrometer system is an inextricable challenge associated with this effort, and requires a very accurate and fast method for calculating the electrostatic fields created within its volume. To this end, the work described in this thesis documents the development of a novel variation on the Fast Multipole Method (FNM), which is a hybrid of the canonical algorithm and the Fast Fourier Transform on Multipoles (FFTM) method. This hybrid technique has been implemented to take advantage of scalable parallel computing resources and has been used to solve the Laplace boundary value problem using the Boundary Element Method with millions of degrees of freedom. Detailed measurements taken during the KATRIN main spectrometer commissioning phase are used to validate the fully three-dimensional electrostatic field calculation and the hybrid fast multipole method. Then, the hybrid method is used to greatly accelerate charged particle tracking in a high-statistics Monte Carlo simulation. The data from this simulation is then used to develop a spatially resolved model of the main spectrometer transmission function. This full transmission function model is then used to evaluate the performance of several of approximate transmission function models, the results of which show that a purely axially symmetric treatment of the main spectrometer is not sufficient. We conclude by addressing the appropriate level of measurement detail needed in order to reconstruct a realistic, non-axially symmetric transmission function model.
Development of a Highly Sensitive Hollow Waveguide Based Raman System for the Compositional Analysis of the KATRIN Tritium Source Gas
Author: Simone RuppFrontiers of Surface-Enhanced Raman Scattering
Author: Yukihiro OzakiPublisher: John Wiley & Sons
ISBN: 111870357X
Category : Science
Languages : en
Pages : 466
Book Description
A comprehensive presentation of Surface-Enhanced Raman Scattering (SERS) theory, substrate fabrication, applications of SERS to biosystems, chemical analysis, sensing and fundamental innovation through experimentation. Written by internationally recognized editors and contributors. Relevant to all those within the scientific community dealing with Raman Spectroscopy, i.e. physicists, chemists, biologists, material scientists, physicians and biomedical scientists. SERS applications are widely expanding and the technology is now used in the field of nanotechnologies, applications to biosystems, nonosensors, nanoimaging and nanoscience.
Analysis Tools and Methods for Tritium Data Taking with the KATRIN Experiment
Author: Florian HeizmannRarefied Gas Dynamics
Author: Felix SharipovPublisher: John Wiley & Sons
ISBN: 352741326X
Category : Technology & Engineering
Languages : en
Pages : 330
Book Description
Aimed at both researchers and professionals who deal with this topic in their routine work, this introduction provides a coherent and rigorous access to the field including relevant methods for practical applications. No preceding knowledge of gas dynamics is assumed.
Neutrino Mass
Author: Guido AltarelliPublisher: Springer
ISBN: 3540449019
Category : Science
Languages : en
Pages : 0
Book Description
Reviews the current state of knowledge of neutrino masses and the related question of neutrino oscillations. After an overview of the theory of neutrino masses and mixings, detailed accounts are given of the laboratory limits on neutrino masses, astrophysical and cosmological constraints on those masses, experimental results on neutrino oscillations, the theoretical interpretation of those results, and theoretical models of neutrino masses and mixings. The book concludes with an examination of the potential of long-baseline experiments. This is an essential reference text for workers in elementary-particle physics, nuclear physics, and astrophysics.