| Article | |
| Report number | CARE-CONF-05-054-SRF ; CARE-CONF-2005-054-SRF |
| Title | Full Characterization at Low Temperature of Piezoelectric Actuators Used for SRF Cavities Active Tuning |
| Author(s) | Fouaidy, Mohammed ; Blivet, Sebastien ; Chatelet, Frederic ; Hammoudi, Nourredine ; Martinet, Guillaume ; Olivier, Aurelia ; Saugnac, Herve |
| Affiliation | (IPN, Orsay) |
| Publication | 2005 |
| In: | 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.728 |
| Subject category | Accelerators and Storage Rings |
| Abstract | In the frame of the CARE project activities, supported by EU, IPN Orsay participate to the development of a fast cold tuning system for SRF cavities operating at a temperature T=2 K. The study is aimed at full characterization of piezoelectric actuators at low temperature. A new experimental facility was developed for testing various prototypes piezoelectric actuators and successfully operated for T in the range 1.8 K-300 K. Different parameters were investigated as function of T: piezoelectric actuator displacement vs. applied voltage V, capacitance vs. T, dielectric and thermal properties vs. T and finally heating DT due to dielectric losses vs. modulating voltage Vmod and frequency. We observed a decrease of the Full Range Displacement (FRD or DX) of the actuator from 40μm @ 300K down to 1.8μm-3μm @ 1.8K, depending on both material and fabrication process of the piezostacks. Besides, both material and fabrication process have a strong influence on the shape of the characteristics DX vs. T dependence. Moreover, the variations of losses tangent with T show a maximum at T in the range 30 K-120 K. Finally a dedicated facility located at CERI (Orléans, France) for radiation hardness tests of actuators with fast neutrons at T=4.2 K was developed and the first beam tests results are summarized. |
Record created 2006-02-09, last modified 2024-02-23