The high gradient operation of superconducting
elliptical multicells in pulsed mode is required for linear
colliders or free-electron lasers based on the
superconducting technology. Such an operation is limited
by dynamic Lorentz force detuning if no compensation
for this effect is attempted. The RF power headroom
required for accelerating field amplitude and phase
stabilisation by low-level RF control techniques solely
would be too costly. A new active tuner with integrated
piezo actuators has been developped in the framework of
the european CARE/SRF program to solve this issue. The
design is based on the lever-arm concept of the Saclay
tuner already installed on running TTF cavities. We have
carried out integrated tests of the 9-cell cavity equipped
with the piezo tuner and power coupler in the CryHoLab
horizontal test cryostat. Characterisation of the
electromechanical system consisting of the cavity and
piezo-tuner assembly and full power pulsed tests will be
presented. | 
