• Mode_Cleaner

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.

Mode Cleaner Model

• Simulink 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 Wave Front Sensors

Analog circuits

• common mode servo circuit board

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"