15:04 UTC Peter done working by PSL racks
15:27 UTC Visitor through gate to meet Bubba
15:35 UTC Mark to LVEA to put away equipment near HAM3 from ion pump work
15:35 UTC APS through gate
16:00 - 16:09 UTC System lead meeting in CR
16:12 - 16:16 UTC Corey to LVEA to assess area around HAM6
16:24 UTC Peter to PSL enclosure
16:41 UTC Jeff B. to LVEA to remove dust monitors 4 and 5
17:01 UTC Jeff B. done
17:01 UTC Betsy to biergarten
17:11 UTC Travis to end X to get locking bracket and check health of suspension
17:28 UTC Filiberto and Daniel to PSL racks
17:33 UTC Travis back from end X, heading to LVEA to give part to Betsy
17:38 UTC Travis back
18:04 - 18:14  UTC Tour in CR
18:21 UTC Kingsoft water through gate, here to take samples
18:54 UTC Tour in control room
19:05 UTC APS through gate
19:15 UTC Peter back
19:37 UTC Betsy back
20:03 UTC Betsy and Filiberto to biergarten
20:07 UTC Bubba to mid and end stations to lubricate fans
20:18 - 20:24 UTC Keita turning on power to ISS second loop chassis
20:50 UTC Hugh to end X to check HEPI
20:57 UTC Greg to LVEA to replace TCS laser enclosure panels
21:01 UTC ITMY ISI being unlocked
21:05 UTC Filiberto to LVEA to talk to Greg
21:09 UTC Jeff K. running transfer function measurements on ITMY
21:10 UTC Hugh back
21:11 UTC Jason and Rick to PSL enclosure
21:24 UTC Filiberto to PSL racks, install EOM driver panel
21:25 UTC Tyler, Mark to LVEA to put door on ITMY BSC chamber
21:38 UTC Peter to PSL racks
21:55 UTC Travis to LVEA to help with closeout
21:59 UTC Betsy, Travis back
21:59 UTC Keita to PSL racks to check PSL ISS second loop board
22:42 - 22:56 UTC Tour in CR
22:48 UTC Tyler and Mark done, BSC1 and BSC3 doors are on
23:00 UTC Peter done
23:01 UTC Filiberto done

I added the IPC connection to get mode cleaner length info over to the IMC ASC lockin system.  In order to not change the common library part, I ended up using the MC_F input to the IMC block in the LSC model. I confirmed that I could see my dither lines from the last IMC A2L spot measurement in this channel, so it should be fine. 

The models compiled fine on h1build. These models (LSC and ASCIMC) are ready for restart followed by a DAQ restart, on the next Tuesday maintenance that we're rebooting models.

This is related to ECR E1800134, FRS 10561, WP 7536.

Prior to door installation performed continuity test on both ITMY and  ITMX ESD with the help of Betsy and Jim. All passed.

The only purge air pathway now is the one near HAM 4 on OMC. I decoupled those on XBM, YBM, and IMC - they are blanked off and the metal valve is open and ready for rough pump down.

Removed viewport from A2F4 and installed a blank (viewport removed D1100999v1 SN022).
Installed two viewports (high quality type) on ports A1F3 and A1F4, south door.

A2F3 D1100999v1 type SN011.
A2F4 D1100999v1 type SN022 viewport removed from the north door.

Installed two new viewports on HAM5, one of them on top of the HAM chamber port D8 and another one on port A1F2.  Both of the viewports are ZV-800 type.

Installed viewport SN-R137 on port D8.
Installed viewport SN-R140 on port A1F2.

Removed two viewports and installed blanks on ports A2F3 and A2F5.
Removed viewport from A2F4 (high quality VP) and installed the viewport that was removed from A2F5.

East door is now as follows:
Blanks are installed on A2F3 and A2F5.
A2F1 ZV-800 type SN080.
A2F2 ZV-800 type SN066.
A2F4 ZV-800 type SN081.

Betsy, Sebastien, Slawek


Work on installation of AMDs on ITMx and ITMy has been completed. 
Each test mass has now 4 AMDs glued to the suspension flats.  All AMDs on ITMy are glued slightly lower than the nominal AMD height position. It appears that quad suspension of ITMy is  ~5 mm longer than the ITMx quad. We have noticed it after AMD installation. This new AMD position should not cause any AMD performance degradation neither increase thermal noise according to our simulation.
Additionally, due to the scratches on the test masses flats we decided to move AMD 4 on ITMx and AMD 4 on ITMy. The exact gluing locations are shown in the attached drawing.
The curing dynamic test of the epoxy EPOTEK 302-3M of all batches was passed, see attached picture.  The bond between AMD and TM looks good for each AMD (see the back face image of the AMDs). 
We can call this installation 100% successful.

Georgia Sheila Jeff K Craig Daniel S

We made an attempt to check that the ITM ESDs were functioning before putting the doors on by using the ITMX driver bias channel to drive quadrants of ITMY.  (we left the ITMY bias at 400V, and drove +/-400V at 0.6Hz out of the ITMX driver bias channel, which we temporarily connected the signal electrodes on ITMY).  This means that we were applying voltages to the ITM that are similar to what we use for the ETM oplev charge measurements.  From alog 38656  the actuation strength is 2(gamma-alpha)*Vbias newtons/volt, for the ITMs this is about 1e-10N/V  and for the ITMs it is about 2e-11N/V, so the ITMs are a factor of 5 weaker actuators than the ETMs.

However, the ITM optical levers are 3 orders of magnitude noisier than the ETM optical levers, even though we turned the purge down.  For this reason we did not see any signals and lost a bet with Jeff K.

Fil had bypassed the interlock on the pressure for us, we turned off the high voltage supplies when we were finished and removed the pressure sensor bypass.  When we turned the purge air back up, the soft door cover partially came off of the ITMY chamber.  We turned the butterfly valve on the y purge air to about 45 degrees, added an extra clamp to the door cover, which is on but billowing a lot. 

Initial attempts to utilize the "long" control cable which would enable the remote location (adjacent room) of the control power supply had resulted in cryptic supply power-related errors at the controller unit.  As such we had been forced to run this unit in the VEA using a short control cable.  It had been assumed that something was wrong with the long control cable. 

Today, I did some experimenting and determined that the controller didn't "like" our 122.8 VAC at the receptacle in the adjacent room.  This same control unit gave no errors and had been working for the past few weeks when powered by a power strip in the VEA. which measured 121 VAC.  The apparent acceptable voltage range of this European-sourced controller is between 110 - 120 VAC.  To demonstrate this, I used a small variac to reduce the 122.8 VAC at the desired receptacle to < 117 VAC.  Following voltage reduction, the controller has stopped complaining and seems to be working just fine. 

J. Kissel

Standard health checks on HAM5 suspensions today (SRM, SR3, OFI, and ZM2) as we prepare to close out HAM5. All suspensions pass their tests.

/ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/SR3/Common/Data/2018-05-02_H1SUSSR3_All_OSEM_ASDs.xml
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/Common/Data/2018-05-02_H1SUSSRM_All_OSEM_ASDs.xml
/ligo/svncommon/SusSVN/sus/trunk/OFIS/H1/OFI/SAGM1/Data/2018-05-03_2004_H1SUSOFI_OSEM_ASDs.xml
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/ZM2/SAGM1/Data/2018-05-03_H1SUSZM2_OSEM_Noise_ASDs.xml

/ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/SR3/SAGM1/Data/
    2018-05-03_1851_H1SUSSR3_M1_WhiteNoise_L_0p02to50Hz.xml
    2018-05-03_1851_H1SUSSR3_M1_WhiteNoise_P_0p02to50Hz.xml
    2018-05-03_1851_H1SUSSR3_M1_WhiteNoise_R_0p02to50Hz.xml
    2018-05-03_1851_H1SUSSR3_M1_WhiteNoise_T_0p02to50Hz.xml
    2018-05-03_1851_H1SUSSR3_M1_WhiteNoise_V_0p02to50Hz.xml
    2018-05-03_1851_H1SUSSR3_M1_WhiteNoise_Y_0p02to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/SAGM1/Data/
    2018-05-03_1845_H1SUSSRM_M1_WhiteNoise_L_0p02to50Hz.xml
    2018-05-03_1845_H1SUSSRM_M1_WhiteNoise_P_0p02to50Hz.xml
    2018-05-03_1845_H1SUSSRM_M1_WhiteNoise_R_0p02to50Hz.xml
    2018-05-03_1845_H1SUSSRM_M1_WhiteNoise_T_0p02to50Hz.xml
    2018-05-03_1845_H1SUSSRM_M1_WhiteNoise_V_0p02to50Hz.xml
    2018-05-03_1845_H1SUSSRM_M1_WhiteNoise_Y_0p02to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/OFIS/H1/OFI/SAGM1/Data/
    2018-05-03_1830_H1SUSOFI_M1_WhiteNoise_L_0p02to50Hz.xml
    2018-05-03_1830_H1SUSOFI_M1_WhiteNoise_T_0p02to50Hz.xml
    2018-05-03_1830_H1SUSOFI_M1_WhiteNoise_Y_0p02to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/ZM2/SAGM1/Data/
    2018-05-03_1827_H1SUSZM2_M1_WhiteNoise_L_0p02to50Hz.xml
    2018-05-03_1827_H1SUSZM2_M1_WhiteNoise_P_0p02to50Hz.xml
    2018-05-03_1827_H1SUSZM2_M1_WhiteNoise_Y_0p02to50Hz.xml

Minor detail:
While taking spectra of the SR3 AOSEMs, I noticed they had obviously, artificially low, high-frequency noise. Digging around, I found that the SR3 M3 OSEMINF banks for each of the four OSEMs had an additional filter called "But60" (besides the standard 10:0.4 that inverts the SatAmp whitening, and the "to_um" scalar gain filter that converts ADC counts to [um]). This filter is a 60 Hz Butterworth low-pass filter, and after brainstorming with Jenne, we agreed that this filter is in place because SR3 has a "cage servo" in which the M3 OSEMs are fed back to to the M1 top mass actuators to keep the position of SR3 optic fixed to the SR3 cage (implemented before O1, see LHO aLOG 20571). It's an EPICs servo, word on the street (i.e. comments in the SR3_CAGE_SERVO guardian code) is that its bandwidth is 100 * 1/(3*60) = 0.555 Hz.

Maybe the filter was installed after a satellite amp went rogue (see LHO aLOG 25500). 

Whichever, doesn't matter. I just want to get keywords of this filter in the aLOG such that, in two years, when we've found a magical scheme to control the angle of the SRC and/or we've found that the venetian blinds (D1700239, installed Dec 2017, LHO aLOG 39663) fix the alignment drift at the source, then we remember why we have this filter in place and turn it off.

Chris, Mark, Tyler

Installed HAM4 S door this morning and HAM5 N/S doors this afternoon. We will start pumping on annuli asap.

TITLE: 05/03 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM5 is closed, PSL work continues, ITM AMDs on.
LOG: attached

(Chris S, Corey G, Keita K, Niko L, Tyler G)

HAM5 had a couple of installation activities slated for this week.  (Task#1 was the installation of a new beam dump near ZM2, on Tuesday.)  Task #2 (FRS #9647) involved baffling for the OFI (Output Faraday Isolator).  There was thought of a bigger job including installing new baffles around the OFI assembly, but we did not receive these parts in time for this week.  So it was scaled down to swapping the baffle which is already installed on the OFI with one which is the same part, but modified.

We had the original part (D0902845) installed on HAM5, but also had another one which was designated for a modification involving making a few cuts into it and bending a portion of the part up (this is to address a ghost reflection from the HAM5/6 Septum window (the crane north / +X window)).  Originally attempted to use a nibbler to make the cuts, but this was not possible & we (i.e. I) ultimately broke the tool.  Tyler G. was recruited to modify the part in the machine shop & he made the cuts using the mill (he did so in a best effort clean manner) & he also bent the part as called out as well.  Instructions for the modifications are in FRS #9647.  Chris S. then performed an overnight clean-bake on this modified part so we could install it today.  THANK YOU SO MUCH Tyler & Chris!!

HAM5 Work (I installed this after the morning meeting today [Thurs]):

• Power-cyled HAM5 & 6 dust monitors per TJ's request.
• Removed installed-baffle from OFI (D0902845-v4 s/n002, as etched on part) and bagged/tagged it.
• Installed modified-baffle (D0902845-v5 s/n001, as etched on part) with same (qty4) screws of original part.
• Took Photos
• Removed 4" wafer & Hugh bagged & tagged the container...this guy was only in-chamber for a few weeks between chamber-openings & was in the chamber a few days this week before being removed; so not sure how useful it is, but we have bagged & tagged it.
• Cleaned up tools, parts, etc.

To Do Item:  ICS what happened for this Task and ZM2 Beam Dump.

Photos/Attachments:

It was hard to take photos of this guy from the "output side" because it is on the edge of the table close to the septum (i.e. a tight fit).  Attempts are attached/described below.

• Drawing of the modified baffle by Eduardo Sanchez (CIT), grabbed from FRS #9647.
• Photo #1, Horizontal position of cuts:  The instructions called for "5mm & 100mm from the right side of the aperture".  Wasn't totally clear what this referred to the center of the cut or the edge of the cuts.  Anyway, wanted to share what the modification looks like--I'll take blame if the position is was not as desired.
• Photo #2, Vertical mark for cuts.
• Photo #3, Modified baffle (front) before install.
• Photo #4, Modified baffle (side) before install.
• Photo #5, Old baffle before removal.
• Photo #6, New baffle installed (front).
• Photo #7, New baffle installed (looking through aperture).
• Photo #8, New baffle installed (from above)
• Photo #9, New baffle installed (from back)

Temperature ramp down on CP4 bake is looking good. Currently at 90C.

All fibers welded and annealed.  After a couple of iterations of pitch correction annealing, we wound up with a final differential pitch of ~190 µrad.  More stats and photos to follow soon.