Magnetostrictive tuners for SRF cavities

Energen Inc. has demonstrated two new tuners to address slow and fast SRF cavity tuning requirements. The slow tuner uses a linear stepper motor to deliver high-force, sub-micron linear motion of tens of millimeters at cryogenic temperatures resulting in hundreds of kilohertz tuning range. A separate actuator delivers fast tuning capability for microphonics and Lorenz detuning compensation. These tuning systems are based on magnetostrictive actuators that can deliver high force precision motion at cryogenic temperatures. Performance and capabilities of this prototype SRF cavity tuner will be reported.