LIGO Weekly Report for the week of 12 March - 16 March 2018

LIGO Laboratory Administration LIGO Laboratory Safety
Computer Security LIGO Hanford Observatory (LHO) and Interferometer Operations LIGO Livingston Observatory (LLO) and Interferometer Operations Engineering Data Analysis and Astrophysics LabWide Activities Advanced Distributed Data Analysis R&D Laboratory Computing Advanced LIGO
Past Weekly Reports

There will be no meeting of the Executive Committee this coming Monday due to the LVC spring meeting.

Calendar of future Executive Committee Meetings

LIGO Laboratory Administration
Hannah Hansen

Revision of FY1923 proposal budget

Property Administration
Nichole Washington
Financial Systems
Giselle Hepker
Procurements and Subcontracts Management
Eric Garcia
General Business Services
Julie Hiroto
Carolyn Peterson

LIGO Laboratory Safety
Albert Lazzarini (Richard Oram, Bubba Gateley)

The safety committee held its monthly meeting.

Computer Security
Ryan Blair

LIGO Hanford Observatory (LHO) and Interferometer Operations
Facilities Operations/Maintenance
Michael Landry
Detector Maintenance/Operations
Betsy Weaver

From Betsy

From Jason


Optical Lever

Electronics, Control and Data Systems Operations
Richard Mccarthy
Control Room Operators
Corey Gray


Jeff Bartlett:

Corey Gray:

Ed Merilh:

Travis Sadecki:

TJ Shaffer:

Cheryl Vorvick:

Information Technologies
Jonathan Hanks

CDS Computing

H1 Commissioning
Daniel Sigg (Keita Kawabe)

No commissioning due to vent activities.

LIGO Livingston Observatory (LLO) and Interferometer Operations
L1 Commissioning
Valery Frolov

After the installation of the four acoustic mode dampers (AMD) on ETMX the full interferometer locking was resumed for one week (until the end of this week) to evaluate the AMD performance as well as potential impact on the interferometer noise. The Q factor of the parametric instability modes was significantly reduced such that the ringdown time for modes at ~20 kHz became <~1s but for modes at lower frequency ~15 kHz the Q factor reduction was 10–100 apparently due to detuning of the AMD resonant frequency by ~5 kHz (this needs more modeling to understand). Never the less the current version of AMDs would extend the interferometer operation from 25 to ~140 W without active damping with ESDs. The contribution of the AMD thermal noise to DARM was evaluated: no excess noise was found in 100–200 Hz frequency range at the level of ~1% of the OMPDs cross spectrum (the averaging is not statistically limited, on the other hand the stationarity of the cross correlated noise has not been investigated at this level).

The squeezed light injection commissioning continued this week. A ~1.5 dB improvement of the shot noise down to ~100 Hz was achieved in full interferometer lock (the bns range at the time was ~95 Mpc due to the HAM6 vacuum pump) without a significant noise injection (from backscatter etc). The squeezer control loop optimization, commissioning and noise investigation are in progress. The squeezer angular control loops are not yet fully operational due to the limited range of one of the two tip-tilt actuators (ZM1) which will be addressed during the upcoming shutdown for the ETMs swap.

Vacuum Group
Scott Mccormick (Richard Oram)

Reporting for the Vacuum Team, Harry Overmier, Justin Schexnayder, Brent Hymel, Scott McCormick

Detector Group
Janeen Romie (Richard Oram)

Detector Engineering weekly summary for Stuart Aston, Matt Heintze, Adam Mullavey & Arnaud Pele

Control Room Operators
Gary Traylor (Richard Oram)

Reporting for:

Gary Traylor, Mike Fyffe, Doug Lormand, Joe Hanson, Danny Sellers, Tom Evans, William Parker

William Parker

Gary Traylor

Mike Fyffe

Danny Sellers

Doug Lormand

Computing and Electronics (CDS, etc.)
Keith Thorne

Michael Thomas

Alyssa Bramley (on leave)

Doug Lormand

Keith Thorne

Paul Corban

Carl Adams, Michael Laxen

Education and Outreach
William Katzman

Dennis Coyne
Mechanics, Optics & Vacuum
Garilynn Billingsley
Norna Robertson
Fabrice Matichard

Squeezer engineering: A first round of gasket change has been performed on the VBO needed to bake the spare parts, but it was unfortunately not sufficient to fix the leak. We’ll disassemble and try to inspect the knife edges on Monday. Continuing to produce spare components in the meantime.

Eduardo Sanchez
Control and Data Systems
Rich Abbott
  1. The design of the in-air portion of the Electrometer support circuitry has been completed by Ben.
  2. Quotes coming in for construction of the internal wiring to the IO chassis upgrade
  3. Zach has shifted to some needed modification to the chassis power regulator boards that we have in inventory.
  4. Todd has shipped the PEM AA units to both observatories, plus the 120 AA boards that were recently completed by Zach. Todd is now working on the implementation of a 3 headed cable for in-vacuum installation of the Electrometer. He is using left-over parts from the aLIGO cable build to save money.
  5. Luis is working on a laptop based program for doing common-mode trim of the internal digital potentiometers associated with the electrometer trim circuitry.
Vacuum System Sustainability
Jon Feicht (Michael Zucker)

Data Analysis and Astrophysics LabWide Activities
Alan Weinstein
Caltech (CIT)
Kent Blackburn
Sarah Gossan

Work on thesis preparation.

Hanford (LHO)
Gregory Mendell

Advanced Distributed Data Analysis R&D
Kent Blackburn

Laboratory Computing
LIGO Analysis and Open Data
Kent Blackburn (Jonah Kanner)
LDAS Software Systems
Ed Maros


NDS2 Client


LDAS System Administration
Sharon Brunett
Philippe Grassia
Dan Kozak
Gregory Mendell
Michael Thomas
General Computing
Melody Araya




Mike Pedraza
Veronica Kondrashov
Larry Wallace
Ryan Blair




Matthew Cowart

Advanced LIGO
Data Computing System (DCS)
Data Analysis Optimization
Peter Couvares
Joshua Willis
Data Analysis Optimization Operations supported
Sharon Brunett
For additional information about this report, contact Albert Lazzarini