Optimierung der transversalen Elektronenpolarisation von HERA bei 26.7 GeV

In the framework of this diploma thesis at different operational conditions of the electron storage ring HERA by the application of different optimization procedures an as high as possible degree of polarization should be reached and the stability and reproducibility of the electron polarization be shown. Furthermore by means of the resonance depolarization an exact measurement of the electron energy of the storage ring should be performed. After a description of the construction of the applied Compton polarimeter and an introduction to the foundations of the polarization determinationby means of the Compton scattering of polarized photons on polarized electrons the for the degree of polarization in a storage ring relevant processes were explained. The methods applied for the optimization of the transverse electron polarization were presented in the following and the measurements performed by this extensively described. By these measurements could be shown that in pure electron-beam operation a degree of polarization of P#propor to#67% can be reached. A adjustment of the electron storage ring determined by this allows also under luminosity conditions without further optimization an only fewly deminuished transverse electron polarization. The measured polarization values where thereby over several hours stable and could also after months be reproduced. An interference of the polarization by electron-proton collisions could not be stated in the framework of the measurements. In an optimization of the electron polarization performed during the luminosity operation polarization values of P#propor to#67% could be reached. Thereby could be stated that an optimization of the electron polarization can be perforemd parallel to the data taking of the experiments H1 and ZEUS without fearing of extensive interferences for the measurement conditions of the experiments. By means of the resonance depolarization, which was at HERA for the first time successfully applied, the electron energy was determined with a maximal error of #propor to#3 MeV and an energy calibration of the HERA electron storage ring performed. At this energy calibration a mean deviation of the nominal energy from the energy values, which were determined by means of the depolarization measurements, of #propor to#35 MeV resulted. By the different studies on the transverse electron polarization and by the production of the worldwide first longitudinally polarized electron beam in a storage ring, in which a degree of polarization of P_l_o_n_g#>=#55% was observed, could be shown that a data taking of the experiment HERMES can be pursued parallel to the experiments H1 and ZEUS in the electron storage ring HERAAvailable from TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman