Seismic Isolation System Upgrade SECOND REVIEW
18 April, 2003
8:00 am to ~12:00 pm PT
Teleconference:
Participant No.: 610339
Domestic Call In No.: 800-486-2726
Foreign Call In No.: 201-368-8643
Design Review Viewgraphs:
|
Time (PT) |
Presenter |
PDF Viewgraphs |
PPT Viewgraphs |
Topic |
|
8:00 – 8:10 |
S. Whitcomb, D. Coyne |
none |
none |
opening comments, charge to
the committee |
|
8:10 – 9:00 |
J. Giaime |
|
Global control issues associated with seismic isolation,
an update on the LLO environment (90% percentile) and requirements |
|
|
9:00 – 9:30 |
B. Lantz |
|
An overview of the EPI system designs and their
implementation in prototypes at LASTI |
|
|
9:30 – 9:40 |
|
|
|
Break |
|
9:40 – 10:10 |
B. Lantz |
|
Hydraulic External Pre-Isolator (HEPI) Performance |
|
|
10:10 – 10:40 |
R. Mittleman, D. Ottaway |
electro-Magnetic External Pre-Isolator (MEPI) Performance |
||
|
10:40 – 11:10 |
D. Coyne |
Evaluation of EPI Approaches |
||
|
11:10 – 11:30 |
D. Coyne |
Cost and Schedule |
||
|
11:30 – 11:45 |
S. Whitcomb |
none |
none |
Wrap-up |
Photographs of the EPI Hardware:
|
Photos |
Description |
|
MEPI/HAM System including stiffening beam |
|
|
HEPI/BSC System |
|
|
HEPI Pump Station |
|
|
HEPI
Actuator |
Design Review Documentation for the 2nd Review:
|
Number |
Title |
|
E. Daw, Results from Analysis of Two Years of Band Limited RMS Monitor Seismic Data |
|
|
J. Giaime, Piezoelectric Pre-Isolation and Microseism Feedforward for S2 |
|
|
K. Mason, et. al., Structural Modifications |
|
|
L. Zuo, O. Rifai, S. Nayfeh, Modal Analysis and Feedback Control of HAM MEPI (Note: The modal identification is
prior to the structural modifications and the control comments are early
comments before much control investigation.) |
|
|
D. Coyne, EPI evaluation D. DeBra, Comments on the EPI
Evaluation |
|
|
1st
Review Committee, Report of the Seismic Retrofit Review Panel |
|
|
pending |
D.
Coyne, Response to the Review Committee Report |
|
B. Lantz, C. Hardham, Control and Performance of the HEPI at LASTI |
|
|
R. Mittleman, D. Ottaway, D. Coyne, MEPI Control Strategies on the HAM Platform |
|
|
L. Zhang, Optical Contamination Cavity Test Results for Hydraulic Fluids |
|
|
G. Harry, MEPI Magnetic Field Coupling to Suspensions |
|
|
EPI Cost Estimate |
Relevant Design Review Documentation from the 1st Review:
|
Number |
Title |
|
Initial LIGO Seismic Isolation
System Upgrade: |
|
|
Initial LIGO Seismic Isolation
System Upgrade: |
|
|
External Seismic Pre-Isolation Retrofit Design EPI |
|
|
Quite Hydraulic Actuators for
Initial LIGO HEPI |
|
|
Pre-Isolator with
Electromagnetic Actuator MEPI |
Additional Supporting Documentation:
|
Number |
Title |
|
VME Implementation of the EPI
System Electronics (block diagram) |
|
|
pending |
Seismic Retrofit Project
Schedule |
|
pending |
Hydraulic External Pre-Isolator
(HEPI) Piping & Instrumentation Drawing |
|
Hydraulic Pump Station: Final
Design and Production Proposal |
|
|
E030100-00,
LASTI Drawing List |
Hydraulic Pump Station Drawings |
|
Hydraulic Fluid Data Sheets |
|
|
EPI Spring/Actuator Assembly CAD
Images |
|
|
Electro-Magnetic External
Pre-Isolator (MEPI) Top Assembly Drawing |
|
|
Tuned Dampers for the HAM
Stiffening Beam |
|
|
|
Hydraulic External Pre-Isolator
(HEPI) Top Assembly Drawing |
|
LLO Seismic Time Series Data: a number of 1500 s data sets of the 9 channels of
Streckeisen velocity outputs from LLO. The goal is to make a
"bayou torture test" of ground noise to use as inputs to our
retrofit design models and for Advanced LIGO system models. |
|
|
pending |
LHO Seismic Time Series Data: For windy conditions |