Development of Remote Controls for the Motorized Polarization Controller in LIGO’s Arm Length Stabilization System
- Document #:
- LIGO-T1700331-v1
- Document type:
- T - Technical notes
Other Versions:
- Abstract:
- The arm length stabilization (ALS) system allows the arms of the interferometer to be locked separately, decoupling these two degrees of freedom from the Fabry-Perot and recycling cavities; this system faces issues with polarization drift along fiber optic cables, however, due to factors such as thermal stress, mechanical stress, and irregularities in the shape of the core. If this drift is not corrected, the mismatch in polarization can prevent the interferometer from observing. Currently, this drift is corrected by a motorized polarization controller (MPC) that must be adjusted manually on a regular basis. This project aims to develop comprehensive, user-friendly, and robust remote controls for the polarization controller to streamline the drift correction. The controller was connected through a serial port to TwinCAT Programmable Logic Controller software, on which the controls were written in IEC-1131 structured text. User input through a graphic interface is interpreted and written to this code, allowing the user to remotely control the polarization. In the future, this program could be used to automate the correction process.
- Files in Document:
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- SURF Final Report (SURF Final Report.pdf, file is not accessible)
- Other Files:
- Midterm Talk (Midway Talk PDF.pdf, file is not accessible)
- Midterm Talk Draft 1 (Midway Talk.pptx, file is not accessible)
- SURF Final Presentation (Final Talk.pptx, file is not accessible)
- SURF Final Presentation (pdf) (Final Talk.pdf, file is not accessible)
- SURF Interim Report 1 (Progress Report 1.pdf, file is not accessible)
- SURF Interim Report 2 (interim-report-2.pdf, file is not accessible)
- Topics:
- Authors:
- Referenced by:
- LIGO-T1800048: Final reports from LIGO SURF program, Summer 2017