Speaker
Description
Piezoelectric actuators are widely used in SRF accelerators to compensate for Lorentz force detuning. Since the stroke (displacement) of piezo actuators decreases at cryogenic temperature, accurate evaluation under operating conditions is important. Existing approaches either use the SRF cavity response as an indirect indicator or estimate the stroke from capacitance measurements during cool-down. These methods do not measure the actuator stroke directly and involve trade-offs in precision, complexity, cost, and measurement time.
To address this, we developed a setup* for direct measurement of piezo actuator displacement at cryogenic temperature using a laser displacement sensor inside a cryocooler-cooled cryostat. The system was used to characterize two piezo actuators for the MEXT-ATD cryomodule. In this contribution we present the details of the direct stroke measurement setup and its comparison with the capacitance measurement approach.
Footnotes
*https://arxiv.org/abs/2604.04382
| I have read and accept the Privacy Policy Statement | Yes |
|---|