aLIGO HAM-ISI, Test Report, Phase I: Assembly Validation, LHO Unit #1

Document #:

LIGO-E1000310-v7

Document type:

E - Engineering documents

Abstract:

This unit was first assembled and tested in 2010, until June 17th 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 early 2012. The assembly was validated on February 16th 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 effect of the top mass’s boundary conditions on the TF of HAM-ISIs.

Minor issues that don’t imply further work:
----------------------------------------------------------
-CPS gap measurement with a jig was waived to avoid scratching targets
-Stage 0 level is out of requirements
-Blade #1 spring profile slightly out of requirements
-Adjustment of locker D is borderline
-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:

• E1000310-v7_HAM_Unit_1_Testing_Phase_I_Report.pdf (12.8 MB)

Other Files:

• E1000310-v7_HAM_Unit_1_Testing_Phase_I_Report.docx (22.7 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:

Cable S/N updated

Related Documents:

• LIGO-G1000721: aLIGO SEI, HAM-ISI, LHO Unit #1, Testing Presentation - Part II

Referenced by:

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