Understanding electrospray

[Ricardinio]

In a schematic diagram of an electrospray inlet/ion source a COUNTER ELECTRODE is indicated. My question and doubt is: "Does the counter electrode correspond to the spray shield?".
Thank you for your comments and/or explanations.

[MG]

It is my understanding that anything held at lower potential than the spray needle, upon which the ions or charged droplets impinge (thus completing the circuit), serves as the counter electrode. I think most of this should happen on the spray shield or its equivalent, as you said.

[Ricardinio]

Thank you MG