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Revision 395 as of 2019-02-22 14:47:24
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==== Report for the week of 2/18 ==== ==== Report for the week of 2/25 ====
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 * On Friday and Saturday last week the pump down of the central area took place. We monitored the drift in the four Type B IPs.
 * During the week we recovered the four suspensions successfully: we recovered the alignment of IMs, GAS filters, IPs, oplevs and measured TFs.
 * Terrence, Enzo and Mark installed the length sensing components in SR2 oplev. It's working now and we should use it now to measure the optic's corresponding TF.
 * The SRM IM is still drifting but the speed is decreasing. Yesterday Thursday the speed was '''-81 nrad/min'''. With the aim of predicting when the drift may stop Terrece removed offsets from the time series segments and spliced them in order. The work is still on progress.
 * Terrence did more work in changing the real-time models.
 * Mark did some initial debugging on the stepper reset system, starting with SRM. However there seems to be some model-related problem. A BIO Checker Board gave sensible results for the low 32 bits of DIO card #0 (used for the TM LPCD) but nothing for the high 32 bits (used for steppers, and eventually also the WD). He added the stepper reset stuff to the circuit diagram (D1503660) and made other corrections.

==== Plan for week of 2/25 ====
 * Mark from Tuesday.
 * Enzo from Monday lunchtime.
 * Continue debugging stepper reset system.
 * Fabian monitored suspensions during the vent.
 * Terrence and Mark made lots of changes to the Guardians and RTMs:
  * Added UI to take snapshots with ALIGNED/MISALIGNED channels (for late use by Guardian).
  * Changed "IM1" and "IM2" in channel names to "IMV" and "IMH"; also "DIO" and "BO" -> "BIO".
  * Created library blocks for BIO and made all the Type B models use them.
  * Tweaked the control topology to be more LIGO-style: the error signal for DC control is sensor-setpoint (not setpoint-sensor as in many controls textbooks); the input to the damping block is the uninverted sensor signal(s); there is a hard-wired -1 after the damping block representing default negative gain.
 * Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.)
 * Terrence traced the geophone issue to a group of dead channels (#20-23) on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the TILT OL path (#24-27) that we had planned to debug next.
 * We retested the BIO for stepper remote enable system and this time it was working (probably due to the refactoring of the BIO stuff in the model and/or all the restarts).
 * We rebuilt all the IOP models after removing an unneeded ADC1 block (corresponding to hardware that Yoshizawa-san had removed).
 * Enzo and Terrence wrote Python scripts to automate the process of adapting the control filters to the new topology (where the DAMP and DCCTRL functions are in parallel instead of series).
==== Plan for week of 3/4 ====
 * Enzo at Mitaka.
 * Mark, Fabian Mon-Wed (Thu is farewell party).
 * Final tweaks of SRM?
 * Monitor (re-)pumpdown.
 * Tests of new Guardian.
 * Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off).
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 * Install new RTMs and Guardian.
 * Debug SRM geophones.
 * Setup SRM and SR3 LEN OLs (low priority).
 * Setup SRM and SR3 LEN OLs.
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==== Plan for week of 3/11 =====
 * Mark at Kamioka full week?
 * Enzo at Kamioka Mon, Tue, then JPS.
 *
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 * Enzo vacation, 3/5 and possibly 3/6.  * Enzo vacation, 3/5 and 3/6.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for the week of 2/25

  • Fabian monitored suspensions during the vent.
  • Terrence and Mark made lots of changes to the Guardians and RTMs:
    • Added UI to take snapshots with ALIGNED/MISALIGNED channels (for late use by Guardian).
    • Changed "IM1" and "IM2" in channel names to "IMV" and "IMH"; also "DIO" and "BO" -> "BIO".

    • Created library blocks for BIO and made all the Type B models use them.
    • Tweaked the control topology to be more LIGO-style: the error signal for DC control is sensor-setpoint (not setpoint-sensor as in many controls textbooks); the input to the damping block is the uninverted sensor signal(s); there is a hard-wired -1 after the damping block representing default negative gain.
  • Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.)
  • Terrence traced the geophone issue to a group of dead channels (#20-23) on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the TILT OL path (#24-27) that we had planned to debug next.
  • We retested the BIO for stepper remote enable system and this time it was working (probably due to the refactoring of the BIO stuff in the model and/or all the restarts).
  • We rebuilt all the IOP models after removing an unneeded ADC1 block (corresponding to hardware that Yoshizawa-san had removed).
  • Enzo and Terrence wrote Python scripts to automate the process of adapting the control filters to the new topology (where the DAMP and DCCTRL functions are in parallel instead of series).

Plan for week of 3/4

  • Enzo at Mitaka.
  • Mark, Fabian Mon-Wed (Thu is farewell party).
  • Final tweaks of SRM?
  • Monitor (re-)pumpdown.
  • Tests of new Guardian.
  • Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off).
  • Continue monitoring SRM yaw drift.
  • Setup SRM and SR3 LEN OLs.
  • Work on Type B paper.

==== Plan for week of 3/11 =====

  • Mark at Kamioka full week?
  • Enzo at Kamioka Mon, Tue, then JPS.

Vacation/Travel Info

  • Enzo vacation, 3/5 and 3/6.
  • Enzo et al. Farewell Party, 3/7.
  • Enzo at JPS then final vacation, 3/13-29
  • Terrence's last day, 3/29.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-06-24 12:23:36 by fabian.arellano)