[Kimura, Yasui]

　On May 18, during a routine inspection, Masahiro Takahashi reported that the #39 ion pump power supply had stopped operating and was displaying “Error 20.”
The content of the displayed Error 20 is: “HV interlock not satisfied or HV switch is off. HV cannot run. See section on digital inputs for details.”
After confirming that there were no signs of arcing at the high-voltage cable connections and other parts of the ion pump power supply, the unit was restarted, and it was confirmed that it could operate without any issues.
As a precaution, a spare ion pump power supply and high-voltage cable were temporarily placed near the #39 ion pump power supply to serve as replacements in the event that the unit malfunctions again.