Development of a modified Spinfilter for metastable Hydrogen atoms

For 20 years Lamb-shift polarimeter are built in the Institute for Nuclear Physics in Jülich and used for several experiments. For example, the nuclear polarization of the hydrogen/deuterium atoms of the polarized internal target of the ANKE experiment are measured. They are used to measure the polarization of molecules after the recombination of polarized atoms to study the recombination process in more details or to optimize the surfaces for future storage cell targets like for the coming gas target at LHCb@CERN. Even at the Budger Institute in Novosibirsk and the PNPI in St. Petersburg Lamb-shift polarimeter made in Jülich are used for similar projects.The improvement of nuclear fusion with polarized fuel is also a very interesting topic in this context. Limited energy supplies, such as coal and hydrocarbons, as well as fuel for nuclear fission energy generation, will be depleted in the long term. With the use of spin-polarized fuel particles (D, T, and 3He) the yield of nuclear fusion reactions could be enhanced.The most important component of such a polarimeter is the Spinfilter. It is able due to a combination of homogeneous magnetic and static electric fields and an induced radio frequency of 1.61 GHz to separate metastable (2S1/2) hydrogen atoms in two different hyperfine substates (α-states) from the others so that the occupation numbers can be determined separately to calculate the nuclear polarization. Up to now these Spinfilter could not separate the hyperfine substates with the electron spin mj=-1/2 (β-states). But for the BOB-project (Bound beta decay) of the Tech. University in Munich (TUM) it is very important to measure the occupation numbers of hydrogen atoms in the hyperfine substate |β3> =|mJ=-1/2, mI=-1/2> that are produced due to the rare decay of neutrons into hydrogen atoms and anti-electron-neutrinos. Here, the measurement of the occupation numbers of all 4 hyperfine substates allows one to determine the helicity of the anti-neutrino. For this purpose, a modified version of such a Spinfilter is to be designed at the IKP in Jülich that should be able to separate all 4 substates from each other. It should exist of a cavity to induced two different radiofrequencies at the same time and a corresponding solenoid to produce again a homogeneous longitudinal magnetic field.This Bachelor thesis deals with the tuning of the new cavity, for the correct frequencies and quality factors and design of the solenoid around this cavity for the needed magnetic homogeneity forming a modified Spin Filter