I noticed (somewhat surprised) that we run the ITMs in distributed design (the ETMs are off-loaded). Unless someone remembers a good reason for this, I would recommend switching both to offloaded design. We require a balancing of ETM and ITM transfer function for the HARD/SOFT basis change, which is a bit of a nightmare if we run ETMs and ITMs in different modes.

This also means that by AS top stage offloading implementation (alog 28763) did not work for the ITMs since I relied on the signal flowing through the L1 filter banks. We will have to redo this.

As a follow up to (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28749) we have a build of the framewriter on h1fw2 that splits the producer thread into two components.

Here is a sample timing:

producer thread timings
 recv min:0.0592079 mean:0.0624186 max:0.0642519
producer crc thread timings
 full min:0.0259149 mean:0.0270363 max:0.0351679
 crc  min:0.014359 mean:0.0144825 max:0.0150859
 xfer min:0.0115559 mean:0.0125535 max:0.0200801

The producer thread does nothing but receiving data.  Here we notice the time to receive is increased to the full 1/16s.  We believe this is largely a busy wait while it waits for the data to come in.

The secondary thread (producer crc) is now doing the crc calculations and pushing the data stream into the main buffers.  We will watch this over night and see how the system is running tomorrow.

S. Karki, M. Chen

While trying to take the ETM images at EndX today  to find the position of the Pcal beams we notice the following things:

1. Blocking the beam at receiver modules with beam dump before it enters the integrating sphere helps to reduce the scattered light (slightly).

2. The optical lever needs to be turned off to get any decent picture showing the Pcal beams on it. The optical lever light completely obscures the Pcal beams. (See attached Pic 1).

3. Take pictures with illuminator off to get the the Pcal beam spot on it. Use small f-number to get Pcal beam on focus. (see attached Pic 2).

4. Keeping all the settings from 3, turn illuminator on and increase the f-number to max to get all the features on test mass (see attached Pic 3).

FAMIS #6857

HAM5 and HAM6 are well above the reference trace. In chamber work?

TITLE: 08/03 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Unknown
INCOMING OPERATOR: None
SHIFT SUMMARY:
LOG:

• 13:45 Chris, Bubba - LVEA North Bay disasembling old clean room.
• 15:45 Fil - To LVEA working on CBRS
• 15:59 Kirstna, Michael - To LVEA for CBRS work
• 16:03 Joe - Y arm to patch holes in beam tube enclosure.
• 16:06 Jim, Nusinee - To EX to retrieve anemometers.
• 16:25 Gerardo, Marc - To EY to test out HV for ion pumps
• 16:43 Mike, guest - LVEA tour.
• 17:04 Richard - To LVEA to find Fil
• 17:38 Richard, Mike and guest out. Reported Betsy in near HAM6.
• 17:45 Joe - To LVEA breifly then back to Y arm
• 17:50 Kyle - To EY
• 18:08 Robert, Ansel - Out at EY moving stuff around.
• 18:22 Corey - To LVEA HAM6
• 19:01 Kirstna, Michael - To LVEA for CBRS work
• 19:05 Betsy, Koji, Corey out for lunch
• 19:09 Fil out for lunch
• 19:45 Jeff K - Starting charge measurements
• 20:09 Betsy, Koji - To LVEA HAM6 work
• 20:14 Kristina - Rolling up OSB outer roll up door
• 20:19 Fil, Gerardo - To EY to work on the HV for the ion pump
• 20:20 Bubba - Going along the X arm with the boom lift
• 20:21 Joe - Back to Y arm to fill holes
• 20:33 Corey - To LVEA HAM6 work
• 20:42 DAQ Restart
• 20:48 Jeff B - To LVEA to investigate dust monitor
• 20:39 Koji, Chris - To LVEA HAM6
• 21:00 Sudarshan, Miranda - To EX for PCal work (Going laser hazard)
• 21:19 Mike and Guests - To LVEA tour
• 22:00 Robert, Julia, Ansel - In LVEA
• 22:03 Mike, guests out.
• 22:21 Joe back.
• 22:37 Nutsinee - To LVEA for HAM6 pictures
• 22:48 Robert, Julia, Ansel - out
• 22:54 Nutsinee - out
• 22:56 Fil, Gerardo, Alfredo back from EY

STS and T240 centering checks. FAMIS task 6077 closed.

jim.warner@opsws0:scripts 0$ pwd
/opt/rtcds/userapps/trunk/isi/common/scripts
jim.warner@opsws0:scripts 0$ ./check_sts_centering.py h1
Averaging Mass Centering channels for 10 [sec] ...


2016-08-03 14:55:35.366977
All STSs prrof masses that within healthy range (< 2.0 [V]). Great!


Here's a list of how they're doing just in case you care:
STS A DOF X/U = -0.0 [V]
STS A DOF Y/V = -0.0 [V]
STS A DOF Z/W = -0.0 [V]
STS B DOF X/U = 0.14 [V]
STS B DOF Y/V = -1.259 [V]
STS B DOF Z/W = -0.163 [V]
STS C DOF X/U = -0.0 [V]
STS C DOF Y/V = -0.0 [V]
STS C DOF Z/W = -0.0 [V]
STS EX DOF X/U = -0.249 [V]
STS EX DOF Y/V = 0.603 [V]
STS EX DOF Z/W = 0.032 [V]
STS EY DOF X/U = 0.056 [V]
STS EY DOF Y/V = 0.369 [V]
STS EY DOF Z/W = 0.242 [V]


Assessment complete.
 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

jim.warner@opsws0:scripts 2$ ./check_T240_centering.py h1
Averaging Mass Centering channels for 10 [sec] ...
2016-08-03 14:54:50.368892


There are 1 T240 proof masses out of range ( > 0.3 [V] )!
ETMY T240 1 DOF Y/V = 0.392 [V]


All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = 0.065 [V]
ETMX T240 1 DOF Y/V = 0.062 [V]
ETMX T240 1 DOF Z/W = 0.08 [V]
ETMX T240 2 DOF X/U = -0.222 [V]
ETMX T240 2 DOF Y/V = -0.262 [V]
ETMX T240 2 DOF Z/W = -0.095 [V]
ETMX T240 3 DOF X/U = 0.035 [V]
ETMX T240 3 DOF Y/V = -0.023 [V]
ETMX T240 3 DOF Z/W = 0.048 [V]
ETMY T240 1 DOF X/U = 0.039 [V]
ETMY T240 1 DOF Z/W = 0.053 [V]
ETMY T240 2 DOF X/U = -0.085 [V]
ETMY T240 2 DOF Y/V = 0.056 [V]
ETMY T240 2 DOF Z/W = 0.055 [V]
ETMY T240 3 DOF X/U = 0.053 [V]
ETMY T240 3 DOF Y/V = 0.036 [V]
ETMY T240 3 DOF Z/W = 0.056 [V]
ITMX T240 1 DOF X/U = -0.16 [V]
ITMX T240 1 DOF Y/V = 0.175 [V]
ITMX T240 1 DOF Z/W = 0.121 [V]
ITMX T240 2 DOF X/U = 0.158 [V]
ITMX T240 2 DOF Y/V = 0.147 [V]
ITMX T240 2 DOF Z/W = 0.142 [V]
ITMX T240 3 DOF X/U = -0.089 [V]
ITMX T240 3 DOF Y/V = 0.108 [V]
ITMX T240 3 DOF Z/W = 0.167 [V]
ITMY T240 1 DOF X/U = 0.055 [V]
ITMY T240 1 DOF Y/V = -0.015 [V]
ITMY T240 1 DOF Z/W = -0.079 [V]
ITMY T240 2 DOF X/U = 0.102 [V]
ITMY T240 2 DOF Y/V = 0.094 [V]
ITMY T240 2 DOF Z/W = 0.047 [V]
ITMY T240 3 DOF X/U = -0.152 [V]
ITMY T240 3 DOF Y/V = 0.092 [V]
ITMY T240 3 DOF Z/W = -0.231 [V]
BS T240 1 DOF X/U = -0.053 [V]
BS T240 1 DOF Y/V = 0.028 [V]
BS T240 1 DOF Z/W = 0.096 [V]
BS T240 2 DOF X/U = 0.085 [V]
BS T240 2 DOF Y/V = 0.086 [V]
BS T240 2 DOF Z/W = 0.081 [V]
BS T240 3 DOF X/U = -0.08 [V]
BS T240 3 DOF Y/V = 0.037 [V]
BS T240 3 DOF Z/W = -0.062 [V]


Assessment complete.
 

Work Permits, Maintenance Day 2016 August 02

Counts are attached.

Jenne, Jeff, Robert, Nutsinee, Dave:

Jenne added the CBRS system to the h1ngn model. This system requires four DAC channels. Robert has given up four PEM channels for this temporary test system.

All models on h1oaf0 were restarted. It was necessary to restart the IOP model when DAC channels are moved between models in order to rescan the channel allocations. Because this in turn requires a restart of h1tcscs, Nutsinee tested disconnecting the temperature control cable at the mezanine chiller to see if we could avoid the chiller trips normally related to h1tcscs restarts.

The restart procedure was:

Nutsinee disconnects temp control cable at TCS chiller

All models were shutdown

h1iopoaf0 started

h1pemcs, h1oaf and h1ngn models started (these models use the 18bit DAC)

h1tcscs, h1odcmaster, h1calcs, h1susprocpi models started

Nutsinee reconnects the temp control cable

The chiller did not trip, this was a successful procedure.

The 8 channel 18bit DAC allocation is:

h1ngn (cbrs) chans 0-3

h1pemcs chans 4-6

h1oaf chan 7

Krishna, Michael, JimW

Yesterday during maintenance, Krishna, Michael and I went to EY and recenterd BRSY. Finicky business, but it's done now. BRSY is running again, so we can return to using the normal "Windy" SEI_CONF state for the ISIs. Attached first trend is the last 10 days of the driftmon, noise in the middle is from when the BRS went out of range over the weekend, green on the right is the BRS re-equilibrating after we closed the enclosure.

Second attached trend is 120 days showing several of the resets of this BRS. Looks like the rate of drift is still slowing, hopefully we can go another couple of months.

RPN: 35W- no change

        200W- no change    

FRQ: 35W- no change from 10Hz to 1K. Control signal is better than last week from 1-10Hz. Error signal higher at HF.

        200W- no change

PNT: 35W- no change

         200W- no changes to speak of. High peaks at 100Hz, 1K and HF noise.

MSC: 35W-  no change. TEM₁₀ looks a bit high. HOM power and cts are down marginally from last week

        200W- no significant change. Plot actually looks slightly better than last week despite no adjustments. Errors during measurement can be seen in the .pdf below.

Gerardo, Marc

We tested the HV Ion Pump cable at the Y end station with a DMM and the Fieldfox this morning.  After pulling the cable out of the conduit we found damage on the cable about 17m from the connector.  The damage is electrical in nature and is about where the Fieldfox predicted, see image. 

We did find another scorpion, this time on the toolbox inside of the Y end station VEA.  Watch where you put your hands, Gerardo almost grabbed it looking for a screwdriver.  Gerardo thinks it got in through the ceiling light fixture.

~1115 hrs. local 

Opened exhaust check-valve bypass-valve, opened LLCV bypass-valve 1/2 turn -> LN2 at exhaust in 2 minutes 2 seconds -> Restored valves to as-found configuration.  

Next CP3 overfill to be Friday, Aug. 5th.  

(Betsy, Corey, Keita, Koji & also some photos by Richard M)

Following up on alogs from Keita & Koji, photos from yesterday's work has been uploaded to resourcespace and can be found here:

https://ligoimages.mit.edu/?c=1696

(There's 91 photos.  I did not upload blurry photos.)

I'm attaching highlight photos to this alog & they are roughly numbered in the order taken:

1. M14 (was removed to blow particle off)
2. Fingerprints on NW corner of shroud
3. V-beam Dump (on/near QPD sled on northern part of table) with major damage on both pieces of glass
4. Burn hole at entrance aperature on the shroud glass for OMC
5. Photos of damage on V-Beam Dump after pulled out and on inspection table.
6. Photos of damage on V-Beam Dump after pulled out and on inspection table.
7. Photos of damage on V-Beam Dump after pulled out and on inspection table.
8. Action shots of Betsy/Koji & OMC removal
9. Action shots of Betsy/Koji & OMC removal
10. Action shots of Betsy/Koji & OMC removal
11. OMC PZT mirror with burn mark
12. OMC PZT mirror with burn mark
13. Particle contaminants on OMC Breadboard
14. Delaminated epoxy on one of the "tomb stones"

Note pressure spikes in HAM 6 chamber leading up to OMC failure reported on July 27th. Attached are two trends: 1) pressure between two vents April - Aug; 2) zoomed in with dates annotated.

   Posted are the particle count data from the door removal during the HAM6 vent. No serious contamination issues were encountered during the door removal. It appears the north side of the HAM6 area is dustier than the south side. This could be caused by a variety of factors (such as the ITO table on the north side makes it more difficult for the cleaning crew to access this area.)

   Trend data from the permanent dust monitor at HAM6 over the past 48 hours shows no reasons for concern. 

   In general, the area in and around HAM6, as far as contamination control, is in good shape. Kudos to Christina and Karen for all their hard work and dedication to keeping LIGO's contamination sensitive areas very clean.           

Jason, Nutsinee

Yesterday we replaced the RF driver with a spare hoping it would fix CO2Y power dropped issue (alog28506). CO2Y laser is now a Schrodinger's cat -- we won't know if the new RF driver fixes the problem until we get to lase the laser again after HAM6 work is done.

Procedure

First we shut off the chiller and TCSY power supply. Then we unplugged the power cable, BNC cables, cables from splitter box, and chiller hoses. Since none of the cables were labled, the cables from the splitter box weren't necessary plugged back in to where they used to be (all the output should be the same) but the BNCs cables were plugged back in the same way. Particulates were seen inside the chiller hoses and later got flushed into the system when we restarted the chiller.