aLIGO HAM-ISI, Test Report, Phase I: Assembly Validation, LHO Unit #3

Document #:

LIGO-E1000312-v5

Document type:

E - Engineering documents

Abstract:

This unit was first assembled and tested in 2010, until October 11th 2010. Following the discovery of un-authorized repairs, the unit was disassembled. Testing done before disassembly can be seen under v1 of this document. The unit was re-assembled and tested late 2012. The assembly was validated on December 23rd 2012.

Particularities:
-------------------
-Test GS13 were used. Production GS13s have to be installed, and tested, before in-chamber installation of the unit.
-No L4C

Complementary inquiry:
--------------------------------
-Investigation of the narrow peaks featured on CPS spectra. It proved that they were caused by the spectral properties of ground motion.

Minor issues that don’t imply further work:
----------------------------------------------------------
-CPS gap measurement with a jig was waived to avoid scratching targets
-Stage 0, and stage 1 level are slightly out of requirements, but good enough for this phase of testing
-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.
-Damping loops implementation and testing were waived and need to be performed during the next phase of testing.

Files in Document:

• E1000312-v5_HAM_ISI_Unit_3_Testing_Phase_I_Report.pdf (5.8 MB)

Other Files:

• E1000312-v5_HAM_ISI_Unit_3_Testing_Phase_I_Report.docx (5.1 MB)

Topics:

• Subsystem Test
• Seismic Isolation

Authors:

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

Keywords:

Ham-ISI Unit #3 Assembly validation

Notes and Changes:

Board S/N updated for CPSs 12029 and 12040 based on E1100369 information.

Referenced by:

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