Differences between revisions 15 and 21 (spanning 6 versions)
Revision 15 as of 2022-10-26 11:26:46
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Revision 21 as of 2022-11-02 09:12:15
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 * Phasing is done by Kenta
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 * Phasing is done by Kenta
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 * Phasing is done by Kenta in June
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 * There is only QPD2 ({{{K1:TMS-X_IR_QPDA2_{PIT,YAW}}}}) on the TMSX in-air path. At a random Gouy phase position.  * There is only QPD2 ({{{K1:TMS-X_IR_QPDA2_{PIT,YAW} }}}) on the TMSX in-air path. At a random Gouy phase position.
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  * Is the TMSX in-air beam clipped in the TMS in-vac?
   * https://klog.icrr.u-tokyo.ac.jp/osl/?r=22762
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 * QPD1 is used to the beam position control feeding back to the BS ({{{K1:ASC-DOF1_{P,Y}}}})  * QPD1 is used to the beam position control feeding back to the BS ({{{K1:ASC-DOF1_{P,Y} }}})
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  * {{{{K1:ASC-POP_FORWARD_QPDA1_DC_{PIT,YAW}}}}   * {{{K1:ASC-POP_FORWARD_QPDA1_DC_{PIT,YAW} }}}
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 * {{{K1:ASC-DC{5,6,7}_{P,Y}}}} are to be used for the WFS DC centering loops  * {{{K1:ASC-DC{5,6,7}_{P,Y} }}} are to be used for the WFS DC centering loops
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 * {{{K1:ASC-DC5_{P,Y}}}} are used for the DC centering controls  * {{{K1:ASC-DC5_{P,Y} }}} are used for the DC centering controls
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 * Output matrix
  * {{{K1:ASC-DSOFT_{P,Y} }}} to IY
  * {{{K1:ASC-DHARD_{P,Y} }}} to EY
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  * {{{K1:ASC-DSOFT_{P,Y}}}} to IY
  * {{{K1:ASC-DHARD_{P,Y}}}} to EY

Angular Sensing and Control (Oct, 2022)

WFS ports

REFL (17, 45 MHz)

POP (17, 45 MHz)

AS (17, 28 MHz)

DC QPD ports

TMSX

TMSY

POP Forward

  • There are two DC QPDs on POP Forward, used for the initial alignment
    • K1:ASC-POP_FORWARD_QPDA1_DC_{PIT,YAW} 

    • They can be found on sitemap > ASC overview > All DC QPDs

DC PDs

  • There are POP_P and POP_S DC PDs on POP.
    • K1:LSC-POP_S{P}POL_DC

    • Can anyone add them on an MEDM screen somewhere?

WFS Commissioning

WFS DC centering

General

  • Beam spots on the quadrant diodes must be centered (DC centering)
  • If the beam is off from the WFSs, use the picomotors first because the PZT ranges are not large
  • K1:ASC-DC{5,6,7}_{P,Y}  are to be used for the WFS DC centering loops

REFL

  • Open the REFL shutter first for REFL WFS
  • K1:ASC-DC5_{P,Y}  are used for the DC centering controls

    • FM filters:
      • Gains: null (gain of 0) and Gain(UGF40)
      • LPF: p1 (pole at 1 Hz)
      • Integrator: p0:z1 (pole at 0 Hz, zero at 1 Hz) - turn this on after the LPF

POP

  • DC control loop not implemented yet

AS

  • DC control loop not implemented yet

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)