Submarine actuator for the actuation of a submarine device comprises a container body, from which a drive shaft projects that is suitable for inserting in a seat of said submarine device, which through its rotation actuates said submarine device. The lower frame assembly includes a pair of recessed channels formed on a base portion of the lower frame assembly and extending the width of the lower frame assembly. A selected bid based upon a bid selection process that evaluates a bid from each of the one or more of the plurality of content delivery network providers based upon the auction set of publisher parameters is received from the auction engine. A period specifying unit specifies a detection period of an electric current, which is supplied from the switching elements presently switched and deactivated, by a predetermined time period between an edge, which is caused when the PWM signal changes in level to deactivate the switching elements, and a time point in advance of the edge in the energization period. By bunching the ions in the linear trap 30 prior to ejection, and by focussing the ions in time of flight upon the entrance of the electrostatic trap 130, the ions arrive at the electrostatic trap 130 as a convolution of short, energetic packets of similar mz.