The Two-beam Test-stand (TBTS) in the CLIC Test Facility CTF3 offers unique possibilities to
conduct RF-breakdown related experiments on the accelerating structures and the power extraction
and transfer structures with beam. We report on the set-up of two such experiments, one for the
measurement of the transverse kick and the other for the measurement of positive ion currents.
The purpose of the transverse kick measurements is to determine the effects of a RF-breakdown
event on the beam. Five BPMs in the TBTS will be used to study the trajectory of a pulse train
after a RF-breakdown event, with important implications for the operation of CLIC. Ion currents
ejected from accelerating structures during RF-breakdown events have already been observed at
the 30 GHz test stand at the present test facility. Results and their implications for RF-breakdown
physics are presented, as well as plans for similar measurements at the TBTS.