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= Mode Cleaner =

 . The Input Mode Cleaner is a suspended triangular cavity. Each mirror of the triangle is 0.25 kg, 3" in diameter and 1" thick. The input mode cleaner length is ~13.5 m (27 m round trip), the Finesse is ~1460. Cavity pole is 3.79kHz.

= Locking =
Lock Settings for IMC.
Note C1:IOO-MC_FASTSW = 1 (Enable) and C1:IOO-MC_POL = 1 (Minus) is required state for autolocker to catch lock.

{{attachment:IMC_Lock_Settings.png|IMC Lock settings}}

= Mode Cleaner Model =
  . [[MC_model| MC model ]]
 

= Beam centering =
 . http://nodus.ligo.caltech.edu:8080/40m/2863

 . http://nodus.ligo.caltech.edu:8080/40m/2864

 . http://nodus.ligo.caltech.edu:8080/40m/2867

 . http://nodus.ligo.caltech.edu:8080/40m/2870

= Alignment Sensing and Control =
 . [[MC_WFS| MC Wave Front Sensors ]]

= Analog circuits =

 . [[attachment:MC-Schematic.pdf|common mode servo circuit board]]

= Documents and Links =
 * [[http://www.ligo.caltech.edu/docs/T/T020145-00.pdf|LIGO-T020145-00-R]], "Characterization and commissioning of digital suspensions for the 40m Mode Cleaner"
 * [[http://www.ligo.caltech.edu/docs/T/T020147-00.pdf|LIGO-T020147-00-R]], "Characterizing the length sensing and control system of the mode cleaner in the LIGO 40m lab"
 * [[RF_ASC]], "Interferometer Wave Front Sensing"

Mode Cleaner

  • The Input Mode Cleaner is a suspended triangular cavity. Each mirror of the triangle is 0.25 kg, 3" in diameter and 1" thick. The input mode cleaner length is ~13.5 m (27 m round trip), the Finesse is ~1460. Cavity pole is 3.79kHz.

Locking

Lock Settings for IMC. Note C1:IOO-MC_FASTSW = 1 (Enable) and C1:IOO-MC_POL = 1 (Minus) is required state for autolocker to catch lock.

IMC Lock settings

Mode Cleaner Model

Beam centering

Alignment Sensing and Control

Analog circuits

Documents and Links

  • LIGO-T020145-00-R, "Characterization and commissioning of digital suspensions for the 40m Mode Cleaner"

  • LIGO-T020147-00-R, "Characterizing the length sensing and control system of the mode cleaner in the LIGO 40m lab"

  • RF_ASC, "Interferometer Wave Front Sensing"

Mode_Cleaner (last edited 2022-08-16 23:41:42 by AnchalguptaATligoDOTorg)