Detection of electrons in a combined trap by phase modulation of the confining microwave field

The unique capability to confine particles with opposite charge and very different mass simultaneously in the same spatial region makes the combined trap a promising device for future synthesis of antihydrogen. For recombination experiments it is desirable to detect particles in the combined trap non-destructively. A detection scheme is proposed for that purpose which is based upon the interaction between stored electrons (or positrons) and the field in the microwave trap resonator