*Time
  *8:00 ~ 12:00 or until the end of CAL just before restarting the observation
  *The max end time: 16:00


 *Contents
  *(1)8-9: CAL for the previous week's observation(CAL-G). The shooting of the mirror height(Yuzurihara). Finesse measurement(Oshino).
  *(2)9-11(or 12):
   *Kamioka Mine Company: Tunnel Inspection
   *Kagra site staff: Instrument checks
   *VAC/CRY: Checked by Kimura-san + KAGRA site staff
   *VIS offload if necessary (Takahashi.R)
  *(3)After(2): CAL for the next week's observation.
  *(4)Restart observation after(3)

 *CAL activities
  *Measurement items: [[https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0149/L2314903/001/CAL_measurement_O4.html|JGW-L2314903]]
  *Weekly change in SDF: [[https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0149/L2314962/001/Expected_SDF_changes_in_CAL_during_O4.html|JGW-L2314962]]

 *DGS
  *In basic, we don't touch.