Speaker
Description
The muon production target of the J-PARC MLF adopts a rotating graphite wheel to disperse radiation damage and heat load due to proton beam injection. The target is installed in a beamline vacuum, and the target is driven by a rotary drive transmission system using a drive-line component. Data on the rotational torque and speed of the target are monitored, and the interlock is introduced to stop the rotation and the beam in case of an anomaly. However, even if an anomaly is detected, immediately replacing or repairing the target is difficult in a high-radiation environment. Therefore, preventive detection and identification of the location of the abnormality are necessary.
We confirmed that an FFT analysis of the rotational torque and the rotational speed could detect the vibration in the bearing of the rotary induction motor. This means that the location of abnormalities is identified even from the multiple bearings in the drive system. In addition, we found the existence of minute vibration patterns from the kurtosis and skewness of the signal during low-torque vibration, confirmed that the vibration in the bearing was gradually increasing. In the future, we plan to develop a diagnosis system to determine the lifetime of the bearing using long-short time memory (LSTM).
| Themes for the contribution | 7 Operation of targets and beam dumps: |
|---|
