TwinCAT Library for ALS Laser Locking

Document #:

LIGO-E1300482-v4

Document type:

E - Engineering documents

Abstract:

Library for autolocking of ALS PLL at end stations. Includes a function block that checks for error that may prevent locking and a slow servo that adjusts the laser crystal temperature.

Files in Document:

• E1300482-v4.pdf (224.1 kB)

Other Files:

• E1300482-v4.docx (176.0 kB)

Topics:

• Sensing and Control

Authors:

• Sheila Dwyer

Keywords:

ALS PLL

Notes and Changes:

Updated documentation to better reflect current implementation.
Adding the ability to specify a separate beat note strength.
Adding a choice to select if the Fiber Trans PD measured the total power or only the light in the correct polarization.

Related Documents:

• LIGO-T1300883: Nominal ALS Frequencies

Referenced by:

• LIGO-T1300891-v1: State Diagram for ALS PLL autolocking
• LIGO-E1200381: aLIGO, Slow Controls, EtherCAT Software