​​Plan for the long brake towards O3c
​​[Hardware]
  • ​​Electronics.
  • ​​Signal generator cards for the LVDT driver.
  • ​​Release sensor monitor.
  • ​​Additional filters for the LVDT combiner. Prototype test is necessary in advance.
  • ​​New Oplev covers.
  • ​​Thermal control.
  • ​​blushing up the auto-offloading system. (Including guardian implementation)
  • ​​Comment: this is not for O3c. Likely we would need to lock the IP for this work to take place and the plan is not to open the vacuum chamber.
  • ​​Task: Install new beams in the BS chamber (Mirapro). Mirapro will come to measure the frame so they can design the new beams. In principle this can be finished within six months.
  • ​​Test of modified ACC at the site.
​​
​​[Software]
  • ​​New control scheme.
  • ​​IP Blending with sensor correction (+ feedforward?)
  • ​​Comment: this is not for O3c, but for O4. This is about making the Guardian easier to use.
  • ​​Task: Agree on clear guidelines for Guardian, write them down and create a new implementation. It’s possible test the new code without disturbing the suspensions by using fake Guardian which in turn uses fake Ezca. See klog entry 11559.
  • ​​Comment: this is not for O3c, but for O4. This is about making the medm screen easy to read by choosing a suitable layout common to all suspensions.
  • ​​Task: Redesign medm screens. Okutomi-san began but then he stopped.
  • ​​Comment: this is not for O3c, but for general management.
  • ​​Task: Retrieve information about the status of fishing rods in Type-A and Type-Bp suspensions and write them in the VIS Fishing Rod wiki page.
  • ​​Comment: This should be for O3c. It’s important in case an LVDT driver breaks.
  • ​​Task: Survey all LDVT drivers and measure values of their resistances. This is important in case a driver requires replacing. The only one completely surveyed is SR3 driver (klog 9658). SRM (klog 7437), SR2 (klog 8941) and BS (klog 8951) drivers yet require the measurement of six more resistances each. Type-A, PRM and PR3 have not been surveyed at all. PR2 was partly surveyed (klog 8952).
  • ​​Comment: enabling for O3c but testing for O4. In order to make sure the limit switches work we would need to move the IP likely by a lot, which is risky if we don’t plan to open the vacuum chamber. It would be good to test them and watch the motors visually.
  • ​​Task: Enable IP stepper motor limit switches which only require software additions (as explained in JGW-E2011534). What’s the current status?
  • ​​Comment: this is not for O3c, but in general to make our life far easier than now.
  • ​​Task: Decide on suitable adjustment methods which should be applied for all suspensions and write documentation that everybody can follow:
  • ​​IP LVDT diagonalization: several klog entries.
  • ​​IP geophone diagonalization: klog 9064 and others.
  • ​​IM OSEMs diagonalization: no reference.
  • ​​Mirror actuation coil balancing: klog entries 13739 and 13614.
  • ​​Finish preparation for the time in which we can open the chambers.
​​