Investigation of Rapid Adiabatic Passage for Controlling Collisional Frequency Shifts in a Caesium Fountain Clock

We explore the method of rapid adiabatic passage for collisional frequency shift measurements in the primary caesium fountain clock PTB-CSF2 at the Physikalisch-Technische Bundesanstalt (PTB). This method can be used to vary the local density distribution of the atom cloud by exactly a factor of 2. We investigate the performance of the method for different parameter ranges and obtained agreement b...