Commissioning Shift P14

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P14 (19.7.2019 - 5.8.2019)

• Commissioning Shift Period: 14
• Dates: 19.7.2019 - 5.8.2019
• Commissioning Shift Leader: Yusuke Suda
• Commissioning Shifters / Experts:
  • Drive: shift crew
  • Camera: Mitsunari Takahashi (until 23.7), Daniel Kerszberg (from 22.7), Juan Abel Barrio (22.7 - 2.8), Julien Houles (23.7 - 1.8)
  • AMC / Mirrors: Satoshi Fukami, Tomohiro Inada, Yoshiki Ohtani (from 22.7)

Summary

• Drive
  • Adjustment of CSS locking was done
  • Installation of webcams are ongoing
  • New elevation bolt system has been tested

• Pointing
  • New Az offset value (0.57) was derived by Satoshi
  • Strange PSF spot shift when the telescope passes Az of both 0 deg and 180 deg. Ongoing discussion between Drive and Optics experts

• AMCs
  • Sometimes PC4 needed to reboot
  • Almost full LUT for low-Zd (15-30 deg) was completed (some mirrors should be adjusted soon)
  • Current PSF in low-Zd: D80 = 34.8 mm (requirement: 25 mm)
  • We took PSF image for high-Zd (around 50 deg) and confirmed the necessity of a different LUT for high-Zd

• Camera (CaCo, EvB)
  • Module blocked at high rate (>15 kHz) fixed
  • CaCo: SIS became operable again
  • CaCo: Protection to prevent movement of SIS was implemented (Zd <90 deg)
  • CaCo: Protection of enabling HV for front light
  • CaCo: CalibBox can be controlled by CaCo
  • CaCo: All the needed controls of sub-system to take data only using CaCo interface were completed
  • New EvB v3 was installed and working well at high rate (>15 kHz), No more crash while changing state, Achieved faster transition (ex. READY → OBSERVING in 10 sec)
  • GPS was not receiving -> Reboot -> Work fine (receiver and DHCP working)
  • We took rate scans, pedestal and flatfield runs
  • We could take test shower data (with SIS, pointing to a bright star)
  • Standard data taking procedure with CaCo only was successfully tested (Mrk501)

• Temperature monitor inside the sunlight protection for the wire
  • Eric saw smoke from the temperature monitor
  • Seems to be a power shortcut between the charging cable shielding and the positive pole of the battery on the PCB board
  • Replaced the damaged PCB with another PCB Also, connected the module to a solar charger
  • Eric asked us to try to monitor the temperature via “nRF connect” app, but we couldn’t find the signal (he is out of his office until August 26th)

• Problems and Visits
  • Jul. 22th: A problem in the Flywheel PLC prevented to park out the telescope (lost connection with PLC). Because of this trouble, we could not operate the telescope this day. Jul. 23th: By Koji's instruction from remote, we unplugged the power cable of the PLC and replugged. Then, the PLC is back online. For more detail, see ENERGY#32
  • Jul. 23th - 25th: Two Schneider engineers worked on a cooling unit for IT container and they fixed it. Now 2 out of 3 units are available
  • Jul. 24th: Dragados put gravel in the south east side of the telescope area
  • Jul. 26th: Drive GUI stuck due to a wrong shutdown procedure (a human error, access tower&CSS statuses were not properly checked before entering the telescope area) For more detail, see DRIVE#269
  • Jul. 27th: Visit of AMANAR from Morocco (14 kids + 16 adults), fully satisfied
  • Aug. 1st - 2nd: Visit of CTA site video shooting (Megan) was successfully done
  • Aug. 2nd: Dead bird was found below the mirror surface. It seems that bird hit to a lowest mirror because we can see a black spot in that mirror. This is the second bird strike. We may need some kind of bird prevention
  • Aug. 2nd: New elevation bolt was mistakenly left inside the rail after engineer’s work and the telescope stuck when it tried to unpark. Thanks to Ino’s intervention, we could remove the bolt smoothly. There were no visible damages in both the bolt and rail. For more detail, see GENERAL#64

Commissioning shift reports

• LST EB Weekly Meeting on Jul. 30th. See Report1
• LST Commissioning Meeting on Aug. 6th. See Report2