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<<TableOfContents()>> |
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| * Same as O3GK | |
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| * POP WFSs were newly installed after O3GK | |
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| * | * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9817 * Mostly same as O3GK |
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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) | |
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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 * * There are strong PIT-YAW coupling depending on the position of the beam * https://klog.icrr.u-tokyo.ac.jp/osl/?r=22545 |
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| == DC PDs == * There are POP_P and POP_S DC PDs on POP. |
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= Next Steps = * Guardian implementation * Add trigger for the main ASC switch (K1:ASC-WFS_GAIN) similarly to the IMC switch (K1:IMC-WFS_GAIN) * 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
WFS ports
REFL (17, 45 MHz)
- Optical layout
- PZT1, PZT2, and REFL_WFS picomotors are available to center the beam on REFL_WFS1 and REFL_WFS2
POP (17, 45 MHz)
- Optical layout
https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9623
- POP WFSs were newly installed after O3GK
- POP-S and POP-P cameras are available
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
- AS and OMC_TRANS CCDs are available
- OMC_REFL CCD hasn't been connected
DC QPD ports
TMSY
- TMSY QPD1 and 2 are placed on the TMSY in-air table, with 90 degrees separated in Gouy phase
- QPD1 is used to steer the beam from BS (ASC DOF1 is the TMSY QPD loop feeding back to the BS)
- Beam profile
- No PIT-YAW coupling
TMSX
- 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
- The in-air beam is extremely astigmatic
- There are strong PIT-YAW coupling depending on the position of the beam
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
- Sensing matrix
- Input matrix
- Loops closed
- DSOFT is IY, DHARD is EY
- Loops or noise haven't been characterized
Single X arm
PRMI
PRFPMI
DRFPMI
Next Steps
- Guardian implementation
- Add trigger for the main ASC switch (K1:ASC-WFS_GAIN) similarly to the IMC switch (K1:IMC-WFS_GAIN)
- 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.