LIGO Weekly Report for the week of 9 October - 13 October 2017

Special Announcements LSC Activities LIGO Laboratory Administration 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 other engagements

Calendar of future Executive Committee Meetings

Special Announcements
Albert Lazzarini

Last week Eric Gustafson was elected Fellow of the American Physical Society for 2017. He is joined in this honor by fellow LSC colleagues Jolien Creighton, Daniel Holz, Vuk Mandic. Congratulations to all for this recognition!

LSC Activities
David Shoemaker (Laura Cadonati)

Intensive preparation across the LSC (and Virgo) for the release of papers on new results and preparations for a press conference on 16 October to announce those results.

LIGO Laboratory Administration
Hannah Hansen
Property Administration
Nichole Washington
Financial Systems
Giselle Hepker
Procurements and Subcontracts Management
Eric Garcia

Eric Garcia - CIT, LHO and LLO

Melanie McCandless LLO

Bailey Toon LHO, CIT

Technical Writing Sevices
Kim Burtnyk
General Business Services
Julie Hiroto
Carolyn Peterson

Computer Security
Ryan Blair

LIGO Hanford Observatory (LHO) and Interferometer Operations
General Operations
Michael Landry
Detector Maintenance/Operations
Vernon Sandberg

Detector Engineering

SEI Hugh Radkins and Jim Warner:

SUS and Vent Management Betsy Weaver
Opto-mechanical Jason Oberling
ITMx Fiber Welding
Alignment of SLiC Baffles

Vent Highlights
Contributions from Betsy Weaver, Jeff Kissel, Jason Oberling, Travis Sadecki, Hugh Radkins, and Angus Bell.

(Tuesday) We removed, bagged, and tagged mirrors and associated hardware no longer needed.

(Friday) Both doors have been removed in preparation for next week’s work.

(Monday) ITMx has been successfully hung as a newly welded monolithic. The assembly welding was completed by Travis, Jason, and Angus. The new ITMx was welded and the violin modes of the fibers measured in air with the PUM clamped. The welding went quite smoothly apart from a couple of points:
1) The epoxy around the sapphire prism on one side of the PUM (+Y side) has charred due to heat from the welding of that fiber.
2) The lengths of the horns on the PUM after fibre removal were not all exactly 6.0 mm above the ear, and this was not compensated for exactly with each fiber. The consequence is that the break-off values for one of the fibres (+X-Y) will be higher at the PUM and a bit lower at the ITM

(Tuesday) ITMx: The first half of Tuesday was spent collecting and removing our welding and IAS equipment in the LHO Vertex “Bier Garten” and converting the space from a laser enclosure welding area to a install/assembly area. Travis then replaced the middle wire segment (from top mass to UIM) that was broken during the extraction of the lower structure. He also added the UIM non-magnetic blade dampers (NMBDs) to the main chain suspension blades and removed the unused copper ECD blocks as per E1600011.

ITMY: With Filberto we worked on TCS Ring Heater issues on ITMY. Garilynn and crew commissioned the new baffle alignment equipment on ITMy. We got as far as swinging back the ACB and installed face shield protection on the optics.

(Wednesday) Travis and Betsy put the ITMx main and reaction chains back together and bolted them up. This process included re-seating the UIM and PUM magnet flag assemblies to their proper controls configuration and reattaching them to their 8 respective locations. Betsy and Travis applied First Contact to the CP-HR side and the ITM-AR side, then pealed both sheets prior to pushing the structures together to their nominal 5 mm separation. The unit is still sitting just outside of the chamber, waiting for install later this week.

GariLynn and Betsy spent time installing the new AUX alignment system,that Garilynn procured for us, in the ITMY chamber. It is currently installed and clamped to the in-chamber stool pointing toward HAM4/5/6.

(Thursday) With help from Apollo’s Mark and Tyler, Betsy and Travis re-installed the ITMX lower structure into BSC3. Thursday afternoon, they worked on re-suspending it to begin assessing alignment.

(Monday) Installed the SR3 RoC Heater. The heater is sitting ~6mm away from the back of the SR3 optic and it is plugged into the feed through.

(Thursday) In preparation for installation of the Output Faraday Isolator, Gerardo and Norna finished installing and cabling up the temporary OSEMs onto the current OFI suspension for testing.

With GregG in chamber and JimW helping outside, a new HAM6–5 Septum Window was installed.

On entry to HAM6 a cracked black glass beam dump (for OMC Refl Beam Diverter beam) was found. The dump was broken in a relatively clean vertical fracture … and when reconstructed appears to show a small pock-mark from an apparent small laser blast.

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


Corey Gray:

Ed Merilh:

Travis Sadecki:

Patrick Thomas:

Information Technologies
Jonathan Hanks
H1 Commissioning
Daniel Sigg (Keita Kawabe)

No commissioning activity due to vent.

LIGO Livingston Observatory (LLO) and Interferometer Operations
General Operations
Richard Oram

Post O2 Planned Engineering

This Friday marked the end of week seven of the Planned Engineering program of projects which commenced Aug 28th 2017. See chart below for outline and progress.

LLO Post O2 Vent Plan

The main achievements related to the work plan this week are:

The laser team conducted further alignment and tuning of the 70W amplifier on the PSL table including optimizing mode matching into the pre mode cleaner. The output power of the Front End Laser which suddenly dropped off has been recovered. The 70 W laser is up and running and power stability is being check.

The install teams have installed the newly designed and fabricated baffles to reduce scattered light in HAM 5 and HAM 2. Chamber Doors were put back on as part of storm preparations

Thankfully our region received only slight rain and wind as a result of Hurricane Nate.

LLO was closed over the weekend and storm preparations were made. However, LLO was opened for normal operations to commence Monday morning.

Many thanks to all staff for completing the extra work involved in storm preparations.

The main activities for next week are:

Recovery from storm preparations, powering back up many systems that were switched off as a precaution to power outages.

Vacuum Team commenced pump down of Vertex vacuum

There are a number of work permits that are activities that are “dirty” tasks in that they will generate particles i.e. pulling cables, optical fibers and hoses in overhead cable racks that are planned for next week after the doors are back on.

There are plans for afternoon DRMI commissioning work.

Observatory Computerized Maintenance Management.

FRS - Corrective Maintenance

Key Performance Indicator dashboard of issues tracked in the FRS.

Tuesday Maintenance Period Work Permits opened and or executed this week.

FAMIS- Preventive Maintenance

Tuesday Work Permit Summary

LLO Tuesday Preventive Maintenance Work Orders 2017 (FAMIS)

L1 Commissioning
Valery Frolov

With the vertex pump down underway the input mode cleaner was relocked and the vertex interferometer (DRMI) alignment and locking recovery has started. The DRMI and possibly full interferometer locking is expected to continue for the next three weeks until the remaining parts are ready for the vertex in vacuum installation. The HAM1 chamber is still at air - the investigation of the scatter/clipping in the reflected beam path is expected to be finished on Monday morning. The output mode cleaner was relocked with a single ITM bounce beam. The power in the OMC transmission is consistent with the lower transmission of the SRM: 32% vs 37%.

Vacuum Group
Scott Mccormick (Richard Oram)

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


Detector Group
Janeen Romie (Richard Oram)

Reporting for: Stuart Aston, Matt Heintze, Adam Mullavey and Arnaud Pele

Control Room Operators
Gary Traylor (Richard Oram)

Reporting for:

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

William Parker, Doug Lormand

Gary Traylor

Mike Fyffe

Testing and training lab water manifold testing

Jeremy Birch

Danny Sellers

Doug Lormand

Computing and Electronics (CDS, etc.)
Keith Thorne

Michael Thomas

Alyssa Bramley

Keith Thorne

Paul Corban

Carl Adams, Michael Laxen

Timothy Nelson (Richard Oram)
Education and Outreach
William Katzman

Mechanics, Optics & Vacuum
Garilynn Billingsley

At LHO this week testing Beamsplitter elliptical baffle alignment tool.
The test was mostly successful, we will require small re-work of the laser and microscope mount. The system is currently in place and aligned to within ~2 mm for use by TCS alignment next week. Many thanks to Betsy, Jason and TJ for help in assembly and test.

Norna Robertson
Fabrice Matichard

Squeezer engineering:

Eduardo Sanchez
Control and Data Systems
Rolf Bork

The focus this week has been on modifications to the CDS real-time code generator (RCG) to produce not only hard real-time kernel objects, but also identical software, less kernel specifics, that can be run as an executable in user space. A first cut at this was completed this past week and initial testing is underway on CDS standard Linux and Debian 8 Linux. This version of the RCG will produce both kernel and user space code whenever ‘make’ is invoked in the RCG build area. Early functional checks indicate this generated user space work properly, able to do most everything the real-time kernel object can, including data acquisition and the running of transfer functions via diagnostic tools. This code is by no means ready for ‘prime time’ release, but good progress. Some foreseen uses of this user space code include: - Offline control model testing on any Linux machine, including one’s laptop. - Control simulations, using data feeds from file or DAQ systems. - Testing of models on line, in safer user space, before running the real-time kernel object version. - Using newer Linux features, perhaps eventually run in a hard real-time mode without the requirement of the present CDS Linux kernel patch. This would make it much easier to move to newer versions of Linux within the CDS computers, as changes to Linux can break the CDS patch, which in turn requires expertise to update the patch.

Rich Abbott
  1. Luis has assembled and tested the whitening filters for the Squeezer Homodyne detector.
  2. Squeezer in-vacuum cables due to ship from manufacturer today.
  3. 75 new AA boards are back from assembly. Zach has tested about 50 of them so far. A new batch of an additional 50 or so boards is soon to arrive from LHO.
  4. Todd has been testing the FET Demodulator power boards.
  5. Fiberoptic feedthroughs and cables have been researched and ordered for us in the new I/O chassis design.
  6. Wrote a test procedure for the Homodyne whitening board.
Remote Access
Remote screens
Jonathan Hanks
Vacuum System Sustainability
Jon Feicht (Michael Zucker)

Data Analysis and Astrophysics LabWide Activities
Alan Weinstein
Caltech (CIT)
Kent Blackburn
Jonah Kanner
Thomas Massinger
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


LDAS System Administration
Sharon Brunett
Phil Ehrens
Philippe Grassia
Dan Kozak
Gregory Mendell
Dan Moraru
Alyssa Bramley
Michael Thomas
General Computing
Melody Araya



Mike Pedraza
Veronica Kondrashov
Larry Wallace
Ryan Blair




Dwayne Giardina
Matthew Cowart

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