LIGO Document E1100856-v2

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

Document #:
LIGO-E1100856-v2
Document type:
E - Engineering documents
Other Versions:
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.

Notes and Changes:
Corrected tf data for Phase II-a testing
Phase II-b testing added

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