aLIGO, ISC, TransMon

Document #:

LIGO-E1200166-x0

Document type:

E - Engineering documents

Abstract:

Document tree for the interferometer sensing and control system, transmission monitor in EX and EY. The transmission monitor senses the beam transmitted by the ETM using two QPDs (near- and far-field). These QPD signals are used for global arm cavity alignment control. The transmission monitor also includes an optical path for the green ALS beam to inject it into the arm cavity, including 2 QPDs for pointing control of the green beam.

For the optical layout and optics specifications see:

EX: https://dcc.ligo.org/LIGO-D1201457

EY: https://dcc.ligo.org/LIGO-D1201458

Files in Document:

None

Topics:

• Sensing and Control

Authors:

• Daniel Sigg
• Rich Abbott
• Peter Fritschel

Keywords:

aLIGO ISC Transmission Monitor

Related Documents:

• LIGO-T0900385: The advanced LIGO ETM transmission monitor
• LIGO-E1200167: aLIGO, ISC, TransMonEX
• LIGO-E1200168: aLIGO, ISC, TransMonEY
• LIGO-E1200453: Fine Initial Alignment Procedure of the Transmission Monitor Telescope
• LIGO-E1100537: TRANSMISSION MONITOR TELESCOPE SUSPENSION (TMS) FINAL DESIGN
• LIGO-E1000222: Interface Control Document, ICD - Trans Mon Suspension (TMS) to Interferometer Sensing and Control (ISC) and TMS to Suspension (SUS)
• LIGO-D1201458: TRANSMON ISC EY: component specifications and beam routing

Referenced by:

• LIGO-E1200155: aLIGO, ISC, Optical & Opto-Mechanical Components and Assemblies
• LIGO-E1200198: aLIGO, ISC, Opto-Mechanical Layouts