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⇤ ← Revision 1 as of 2022-10-26 08:55:49 →
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Editor: KeikoKokeyama
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Editor: KeikoKokeyama
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Deletions are marked like this. Additions are marked like this.
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<<TableOfContents()>>
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=== REFL === === REFL (17, 45 MHz) ===
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 * REFL PZT1, REFL PZT2, and REFL_WFS picomotors are available to center the beam on REFL_WFS1 and REFL_WFS2   * Same as O3GK
 * PZT1, PZT2, and REFL_WFS picomotors are available to center the beam on REFL_WFS1 and REFL_WFS2
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=== POP === === POP (17, 45 MHz) ===
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  * POP WFSs were newly installed after O3GK
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 * POP PZT1, POP PZT2, and POP_WFS picomotors are available to center the beam on POP_WFS1 and POP_WFS2
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=== AS ===
=== AS (17, 28 MHz) ===
 * Optical layout
  * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9817
  * Mostly same as O3GK
 * PZT1, PZT2, and AS_WFS picomotors are available to center the beam on AS_WFS1 and AS_WFS2
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 * QPD1 is used to steer the beam from BS (ASC DOF1 is the TMSY QPD loop feeding back to the BS)
 * Beam profile
  * https://klog.icrr.u-tokyo.ac.jp/osl/?r=22479
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 * There is only one DC QPD installed on the TMSX in-air path
 * The beam is NOT centered on the DC QPD when the X-arm is locked
 * TMSX in-air table power budget
  * https://klog.icrr.u-tokyo.ac.jp/osl/?r=22310
 * The in-air beam is extremely astigmatic
  * https://klog.icrr.u-tokyo.ac.jp/osl/?r=22221
 * There are strong PIT-YAW coupling depending on the position of the beam
  * https://klog.icrr.u-tokyo.ac.jp/osl/?r=22228
  * Matteo-san's previous measurement did not show a strong coupling. It seems to depend on the position of the DC QPDs.
   * https://klog.icrr.u-tokyo.ac.jp/osl/?r=20263
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=== POP Forward ===
 * There are two DC QPDs on POP Forward, used for the initial alignment
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== DC PDs ==
 * There are POP_P and POP_S DC PDs on POP.
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 * Loops or noise haven't been characterized  * Loops or noise haven't been characterized
 * No offsets were necessary on the sensors
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= Next Steps =
== Infrastructure ==
 * Guardian implementation
  * DC centering loops on REFL, POP, and AS
  * Single Y, X arms, and PRMI guardstates for initial alignment
 * Add trigger for the main ASC switch (K1:ASC-WFS_GAIN) similarly to the IMC switch (K1:IMC-WFS_GAIN)
== Simulation ==
 * Compare the measured sensing matrices against the simulation
  * Koyama-kun's simulation GUI tool is available on the workstations
   * sitemap > Commissioning Top > finesse GUI
== Integration ==
 * Implement single-Y, single-X, and PRMI controls for the initial alignment
  * If the alignment is too off, first ADS then WFS control?
 * PRFPMI/DRFPMI angular controls
 * Noise budget

= Known issues =
 * TMSX PIT-YAW coupling
  * The beam is slightly not centered in yaw on the second lens on the in-air table. Adjusting the beam position on the lens might fix the problem.

Angular Sensing and Control (2022)

Contents

  1. Angular Sensing and Control (2022)
    1. WFS ports
      1. REFL (17, 45 MHz)
      2. POP (17, 45 MHz)
      3. AS (17, 28 MHz)
    2. DC QPD ports
      1. TMSY
      2. TMSX
      3. POP Forward
    3. DC PDs
    4. WFS Commissioning
      1. WFS DC centering
      2. Single Y arm
      3. Single X arm
      4. PRMI
      5. PRFPMI
      6. DRFPMI
  2. Next Steps
    1. Infrastructure
    2. Simulation
    3. Integration
  3. Known issues

WFS ports

REFL (17, 45 MHz)

POP (17, 45 MHz)

AS (17, 28 MHz)

DC QPD ports

TMSY

TMSX

POP Forward

  • There are two DC QPDs on POP Forward, used for the initial alignment

DC PDs

  • There are POP_P and POP_S DC PDs on POP.

WFS Commissioning

WFS DC centering

  • Open the REFL shutter for REFL WFS
  • Beam spots on the quadrant diodes must be centered (DC centering)
    • PZTs and picomotors are available

Single Y arm

Single X arm

PRMI

PRFPMI

DRFPMI

Next Steps

Infrastructure

  • Guardian implementation
    • DC centering loops on REFL, POP, and AS
    • Single Y, X arms, and PRMI guardstates for initial alignment
  • Add trigger for the main ASC switch (K1:ASC-WFS_GAIN) similarly to the IMC switch (K1:IMC-WFS_GAIN)

Simulation

  • Compare the measured sensing matrices against the simulation
    • Koyama-kun's simulation GUI tool is available on the workstations

      • sitemap > Commissioning Top > finesse GUI

Integration

  • Implement single-Y, single-X, and PRMI controls for the initial alignment
    • If the alignment is too off, first ADS then WFS control?
  • PRFPMI/DRFPMI angular controls
  • Noise budget

Known issues

  • TMSX PIT-YAW coupling
    • The beam is slightly not centered in yaw on the second lens on the in-air table. Adjusting the beam position on the lens might fix the problem.

KAGRA/Subgroups/MIF/AngularSensing (last edited 2022-11-02 09:12:15 by KeikoKokeyama)