aLIGO BSC-ISI, Test Report, Phase 2, LLO Unit #2 (L1-BSC1 - ITMY)

Document #:

LIGO-E1100856-v2

Document type:

E - Engineering documents

Abstract:

This document presents series of tests (Phase II) performed on the ISI-BSC1 (ITMY) after the ITMY quad suspension (in final configuration) was mated with the ISI and the ISI rebalanced.
Phase 2-a tests started in on October 24th 2012. Testing was completed on October 31st 2012.

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All results appear satisfying, apart from a few test waived (will be done during phase II-b):
- Added mass on Stage 2 is more 36 kgs lighter than it used to be during testing (requirement is 25 kgs). We think the uncertainty on the loaded payload is such that this is not worrysome.
- Static tests in the Cartesian basis (redundant with the static test in the local basis)
- Linearity test: some corners have slightly different slopes but nothing strikingly alarming. We have seen in the past (HAM-ISI phase 2 testing) stronger slopes different, blamed on different cable lengths inside the LVEA.
- St 1 corner 2 actuators are wired in the opposite direction and St 2 corner 3 actuator cables are flipped. This can be corrected after the cartridge install.
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Phase 2b testing was conducted between December 5th and December 17th 2012. The dome was approved to be closed and closed on December 17th 2012.
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All results appear satisfying, apart from a few test waived (will be done during phase II-b):
-
-Static tests in the Cartesian basis (redundant with the static test in the local basis)
- Linearity test: some corners have slightly different slopes but nothing strikingly alarming. We have seen in the past (HAM-ISI phase 2 testing) stronger slopes different, blamed on different cable lengths inside the LVEA.
- St 1 corner 2 actuators are wired in the opposite direction in some of the static tests. This was corrected before closing the dome.

Files in Document:

• E1100856-V2 - L1 ISI-BSC1- Phase II report.pdf (2.2 MB)

Other Files:

• E1100856-V2 - L1 ISI-BSC1- Phase II report.doc (3.4 MB)

Topics:

• Seismic Isolation
• Subsystem Test

Authors:

• Vincent Lhuillier
• Celine Ramet
• Adrien Le Roux
• Michael Puma

Keywords:

BSC-ISI Testing BSC1 ITMY test

Notes and Changes:

Corrected tf data for Phase II-a testing
Phase II-b testing added

Referenced by:

• LIGO-E1100990: aLIGO BSC-ISI, Phase II Testing Reports (Integration process)