aLIGO HAM-ISI, Test Report, Phase I: Assembly Validation, LHO Unit #4 (HAM2)

Document #:

LIGO-E1000313-v2

Document type:

E - Engineering documents

Abstract:

HAM-ISI Unit #4 was built in March 2012. Tests presented here were performed between March 28th 2012 and April 4th 2012.

Particularities:
------------------
-This Unit received two production GS13s from Unit #2
-Full set of production GS13
-L4C Brackets but no L4C

Complementary inquiry:
--------------------------------
Investigation of the effect of washers’ disposition/thickness on high frequency unwanted resonances/noise (LHO alog # 2520)

Minor issues that don’t imply further work:
----------------------------------------------------------
-CPS gap measurement with a jig was waived to avoid scratching targets
-Excessive STD measured on CPSs is associated to ground motion

Minor issues that imply further work:
---------------------------------------------------
-Actuators linearity is within requirement. However the average slope deviation is out of spec. It seems to correlate with the cable+actuator resistance measurements. This observation needs to be correlated with the final measurements made with the in-field cables.

Files in Document:

• E1000313-v2_HAM_Unit_4_Testing_Phase_I_Report.pdf (8.3 MB)

Other Files:

• E1000313-v2_HAM_Unit_4_Testing_Phase_I_Report.docx (4.0 MB)

Topics:

• Seismic Isolation
• Subsystem Test

Authors:

• Hugo Paris
• Fabrice Matichard
• Jim Warner
• Hugh Radkins
• Mitchell Robinson
• Corey Gray
• Greg Grabeel
• Eric Allwine
• Vincent Lhuillier

Keywords:

HAM-ISI Testing Phase I

Notes and Changes:

The assembly is validated.
Comments were added to failed tests.

Referenced by:

• LIGO-E1100996: aLIGO HAM-ISI, Phase I Testing Reports