Guide to Troubleshooting aLIGO RFPDs

Document #:

LIGO-T1300488-v4

Document type:

T - Technical notes

Abstract:

This note provides data and methods useful in troubleshooting aLIGO RFPDs. The inaccessibility of the in-vacuum LSC and ASC detectors necessitates a guide to permit diagnosis prior to a vacuum incursion. The graphs and data in this note apply to in-air detectors as well.

Files in Document:

• PDF Version (RFPD_Troubleshooting_v4.pdf, 693.8 kB)

Other Files:

• Word Version (RFPD_Troubleshooting_v4.docx, 2.4 MB)

Topics:

• Sensing and Control
• Subsystem Test

Authors:

• Rich Abbott

Keywords:

RFPD

Notes and Changes:

Version 4 adds S11 data taken at LLO in August 2013. Explanatory text has been added to help diagnose cable problems in and out of the vacuum envelope.

Related Documents:

• LIGO-D1101614: aLIGO ASC RF Photodetector (WFS) Schematic
• LIGO-T1000264: List of ISC Photodetectors in Advanced LIGO

Referenced by:

• LIGO-T1300506-v1: aLIGO RFPD Spot Check Procedure
• LIGO-E1400103: aLIGO ASC RF Photodetector (WFS)