Last week HAM6's vacuum gauges were upgraded from the original pirani-coldcathode pair to the new Beckhoff Infinicon BPG-402. The new gauge has two channels (MOD1 and MOD2) which both record the vacuum over the full range of atmospheric (760 Torr) down to 1.e-09 Torr

I have renamed the archived Cold-Cathode minute trend files to match the new MOD1 name. In other words, if you ask for minute trend data prior to 8/10 for channel H0:VAC-LX_Y0_PT110_MOD1_PRESS_TORR you will be given data for the CC channel H0:VAC-LX_Y0_PT110B_PRESS_TORR. Note the archvied Pirani data is not accessible from NDS. I will write code to obtain data directly from the raw minute trend files if this is needed.

I will make the same changes for the other gauges which have been upgraded (PT170 and PT180)

Peter, Dave:

we modified h1pslfss under WP6100 to fix two bugs:

temperature channel inputs to DINCO for OOL and Ambient were swapped in the model

DINCO DAC outputs drive chans 08-11 and not 12-15

model was restarted, no DAQ restart was required.

Kyle, Chandra

Valved in IP and valved out TP. Pressure fell from 1.1e-6 Torr to 9e-7 Torr when IP was valved in and now is slowly rising with TP valved out (currently at 1.2e-6 Torr). After IP reaches thermal equilibrium we expect pressure to fall again. After that is observed we will shut down turbo + scroll (hopefully this afternoon).

Note: verified the MPC controller was ON and programmed for 500 L/s pump prior to valving back in. Read -5700 V. Now reads -5000 V with load.

LLO site was generally unaffected by the major flooding in Livingston and Baton Rouge area.

However, access to the site was difficult and hazardous so the site was closed Friday thru Wednesday.

Many staff had their homes inundated with river flood water.

All staff and visitors were either directly or indirectly affected by this event and many are still helping with the clean up and the recovery efforts underway.

The site is now fully open and has returned to regular operation.

Thanks to all of the LIGO family who have reached out to help those in need.

Note: The monthly Science Saturday event scheduled for tomorrow (08/20/2016) has been canceled.

Manual temp control via multiple variacs -> 10% decrease every few hours

SEI - progress made to miigate tripping of HAM6 ISI when fast shutter is activated

SUS -  no report

CDS - hopeful to close out gust meter work today; PEM AA chassis repaired; TCS AA chassis repaired. Both AA chassis suffered buffer chip damage most likely due to 'hot-swapping'.

CDS SW - continuing worl to address Frame Writer instability issues. Also, formulate a plan for '02

PSL - water leak is repaired. Optics have been wiped. Further inspection of collateral water issues will be performed. Power up of LASER hopeful for this afternoon. TCSY is back up and fully functional at full power. No hard evidence of BS OpLev glitching noted. If said glitchiness persists there will be a plan to swap out the laser.

VAC - will transition HAM6 to ION pump. RGA bakeout work between HAMs 4 and 5 will continue into tomorrow. Length of time most likely will depend on commissioners being able to return to their tasks.

FAC - Bubba will inish eyewash station inspections. DI skid will be re-plumbed'

• PSL still down

Attached is a plot of the cooling water flow rate for the 4 laser heads after replacement of the
burst hose (over head 3) and replacement of the head 4 flow sensor.  Also attached is a 30-day
trend plot of the same signals.  The large jump in flow rates about 6 days into the plot coincides
with replacement of the water manifold located under the table.

    At this stage it is too early to tell if replacing the head 4 flow sensor fixes the problem
with the all over the place signal seen in the 30-day trend plot.

Evan G., Jeff K.

Summary:
We measured the transfer functions of the OMC DCPD anti-aliasing (AA) module paths of ch13-16 for chassis S1102788. We measure this because the filter board was modified for these channels (LHO aLOG 28010). This is similar to the measurement Kiwamu made in LHO aLOG 21123. The OMC DCPD AA channels are 13 and 14 for DCPD A and B, respectively. The OMC PI AA channels are 15 and 16. We find that the notch behaviour of channel 13 matches what Kiwamu found in LHO aLOG 21123, but the notch of channel 14 is distorted (broken?). Channels 15 and 16 do not have the same notch behaviour (as to be expected for the PI paths, matching LHO aLOG 28085). These differences--compared to the calibration model reference AA filter--are below 1% in magnitude and less than 1 degree in phase below 7 kHz. While the calibration group is unaffected by the broken channel 14, noise from 65 kHz will be aliased down into the detection band. We should consider fixing this.

Details:
The setup for the measurements is shown in the first attachment, and the reference measurement (to remove the gain of the single ended to differential box) is shown in attachment 2. Each transfer function measurement is normalized by the reference measurement transfer function.

Data is saved in /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Measurements/OMCAAChassis

Analysis script is saved as /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Measurements/OMCAAChassis/process_aachassis_data_20160818.m

Plots are shown in the third attachment. Of particular note is to compare the new measurements to the AA filter model. Channel 14 (OMC DCPD B) now has a different behaviour near the notch. The difference is below 1% in magnitude and 1 degree in phase below 7 kHz, and does not force a revision in the calibration model reference AA filter.

I have updated the Beckhoff SDF system to the latest channel lists. I'll automate this process soon, here is the process I followed (using ecatc1plc1 as an example)

It is assumed that the /opt/rtcds/userapps/release/ecat area is up to date with its req files (which may be in DOS format)

First get the latest autoBurt.req into the ECAT target area:

cd /opt/rtcds/lho/h1/target/h1ecatc1/h1ecatc1plc1epics

cp autoBurt.req archive/autoBurt.req.18aug2016

cp /opt/rtcds/userapps/release/ecat/h1ecatc1/H1ECATC1_PLC1.req autoBurt.req

dos2unix autoBurt.req

Now get this autoBurt into the Beckhoff-SDF target area and use it to generate the new monitor.req file

cd /opt/rtcds/lho/h1/target/h1sysecatc1plc1sdf/h1sysecatc1plc1sdfepics

cp autoBurt.req archive/autoBurt.req.18aug2016

cp ../../h1ecatc1/h1ecatc1plc1epics/autoBurt.req .

cd burt

cp monitor.req archive/monitor.req.18aug2016

grep "^H" ../autoBurt.req | sort > monitor.req

Now restart the SDF target on h1build (as user controls)

h1sysecatc1plc1sdfstartup

If channels have been added, open the SDF MEDM screen and view the 'CHANS NOT INIT' table. Press the global 'MON' button (which selects all channels to ACCEPT and MON) and 'CONFIRM'. Now all new channels are being monitored, commissioners can decide if any should be taken out of this list.

Finally check the snap file changes into SVN.

This week I installed the ISS Outer Loop chassis into H1-PSL-R1, and hooked most of its cables up.  The two AA cables for PDs 5-8 are not hooked up to an AA Chassis yet, and will be hooked up once the original servo is removed from the AA Chassis (The intention is to re-use one of the original ISS Outer loop servo's cables.)  With the PSL down, I was unable to do any system testing.  I have not disconnected any cables from the original servo, so it is still fully functional.  I made an medm screen in UserApps/psl/h1/medm/H1PSL_ISS_OL.adl  All of the new servo's functionality seems to be working.

The TCS system had a bad channel that I traced back to the AA Chassis, S1301168.  It turns out that 2 of the input buffers (U2 on channels 11 and 12) were bad.  I replaced them, and now everything works fine.  In the e-traveller, it seems that these chips have been replaced once before in February, 2015.  We should keep an eye on them.

The broken hose was replaced.  An attached picture shows the burst end of the hose and the fitting that
goes over that end.  The two other attached pictures shows the hose, end on.

    The turbine flow sensor for head 4 was replaced.  Whilst there was no problem with this sensor per
se, its output was somewhat noisier than the three other sensors.  Replacing it now seemed like a prudent
thing to do.  A visual inspection of the flow sensor showed what might be a small build up of material
around the turbine.  If true that would in part explain the noisy signal from this sensor.

    The bulge in the crystal chiller return leg hose section in the chiller room was removed.

    The resonator optics of the high power oscillator were inspected for dust and water marks.  The 4f
lenses for heads 3 and 4 were drag wiped.  The lens in front of the reverse direction power monitoring
photodiode was drag wiped clean.  The fibre bundle ends are being given more time to dry out.




JeffB / Peter

G. Mendell, S. Karki, D. Tuyenbayev

Attached are plots showing the calibration factors (kappa_tst, kappa_pu, kappa_A, kappa_C and f_c)  for ER9 generated from Spectral Line Monitor (SLM)  data, analyzed using Matlab code from Sudarshan Karki and EPICS values from Darkhan Tuyenbayev.

The plots show the calibration factors from

1152010820 == Jul 08 2016 11:00:03 UTC

to

1152097220 == Jul 09 2016 11:00:03 UTC

For example, note the behavior of kappa_C and f_c after 18 hrs in the bottom row of the first attached plot.

A full set of plots can be found by going here,

https://ldas-jobs.ligo-wa.caltech.edu/~gmendell/pcalmon_with_plots/daily-pcalmonNavigation.html

and clicking on July 9 2016 in the calendar in the left frame, and then any of the links to the plots in the middle frame. (To compare with O1, click on Dec. 26, 2015 and then on the links to the plots.)

This morning I restarted h1psliss with the revised re-use of the ISS-ADC channels for the new ISS PD5-8 fast and slow signals. This required a DAQ restart. We took this opportunity to revise the H1EDCU_DUST.ini file and added Jonathan's new daqd diagnostics EPICS channels to H1EDCU_DAQ.ini.

• PSL recovery work
• Opportunistic maintenance work in otherwise sensitive areas
• TCSY work completed
• Tours through the LVEA: US Subcommitee on Research and Tech; Corey's family.

Reconnected flow meter to exhaust of CP4 for measurements toward CP3 manual overfill work-around.
 
Installation caused a quick spike in exhaust pressure >3psi. 

(signal name includes CP3 since the device will eventually migrate to CP3 exhaust - CP4 is temporarily being used to collect data to simulate CP3)

Executive summary: 

In regard to narrow lines, the (nearly) full O1 H1 data set is little changed from what was reported for the first week's data: a pervasive 16-Hz comb persists throughout the CW search band (below 2000 Hz), accompanied by a much weaker and more sporadic 8-Hz comb; there remain several distinct 1-Hz and nearly-1-Hz combs below 140 Hz, along with other sporadic combs. The 1459.5 hours of 30-minute FScan SFTs used here span from September 18 to the morning of January 3. The improved statistics make weaker and finer structures more visible than in the 1st week's data. As a result, many new singlet lines have been tagged, and it has become apparent that some previously marked singlets actually belong to newly spotted comb structures. The improved statistics also make it more apparent that the originally spotted combs span a broader bandwidth than marked before 

Details: 

Using 1459.5 hours of FScan-generated, Hann-windowed, 30-minute SFTs, I have gone through the first 2000 Hz of the DARM displacement spectrum (CW search band) to identify lines that could contaminate CW searches. This study is very similar to prior studies of ER7 data, ER8 data and the first week of O1 data, but for completeness, I will repeat below some earlier findings.

Some sample displacement amplitude spectra are attached directly below, but more extensive sets of spectra are attached in a zipped file. As usual, the spectra look worse than they really are because single-bin lines (0.5 mHz wide) appear disproportionately wide in the graphics

A flat-file line list is attached with the same alphabetic coding as in the figures.

Findings:

 A 16-Hz comb pervades the entire 0-2000 Hz band (and well beyond, based on daily FScans)
 A typically much weaker and sporadic 8-Hz comb (odd harmonics) is also pervasive (all harmonics are labeled in figures, even when not visible)
 A 1-Hz comb with a 0.5-Hz offset is visible from 10.5 Hz to 133.5 Hz (previously was visible from 15.5 to 78.5 Hz)
 A 1-Hz comb with zero offset is visible from 16.0 Hz to 102.0 Hz (previously was visible from 20.0 to 68.0 Hz)
 A 99.9989-Hz comb is visible to its 11th harmonic (was previously visible to its 8th harmonic)
 The 60-Hz power mains comb is visible to its 9th harmonic (was previously visible to its 6th harmonic)
 There is a sporadic comb-on-comb with 0.088425-Hz fine spacing that appears with limited spans in three places near harmonics of 77, 154 and 231 Hz (ambiguity in precise fundamental frequency)
 There is a doublet 31.4127 and 31.4149 Hz comb visible to their 2nd harmonics (previously marked as only a 31.4149-Hz comb)
 There are three near-1-Hz combs not previous appreciated:

 0.99999-Hz comb from 19.2500 to 50.2497 Hz
 0.99816-Hz comb from 30.9430 to 60.8878 Hz
 0.9992-Hz comb from 30.9738 to 48.9594 Hz

 There is a doublet comb with spacings of 2.07412 and 2.07423 Hz, visible from their 9th to 32th harmonics (18.7-66.4 Hz) 
 There is a hint of another doublet comb with spacings of 99.9735 and 99.9784 Hz, but they are marked as singlets for now


Line label codes in figures:

b - Bounce mode (quad suspension)
r - Roll mode (quad suspension)
Q - Quad violin mode and harmonics
B - Beam splitter violin mode and harmonics
C - Calibration lines
M - Power mains (60 HZ)
s - 16-Hz comb
e - 8-Hz comb (odd harmonics)
O - 1-Hz comb (0.5-Hz offset)
o - weaker 1-Hz and near-1-Hz combs (various offsets, including zero)
H - 99.9989-Hz comb
J - 31.4127 and 31.4149-Hz combs
K - 0.088425-Hz comb
t - 2.07412 and 2.07423 combs
x - single line (not all singlets in the vicinity of quad violin modes are marked, given the upconversion)

Figure 1 - 0-2000 Hz 
Figure 2 - 20-50 Hz sub-band (shows complexity of combs below ~70 Hz)
Figure 3 - 50-100 Hz sub-band (shows continuation of strongest 1-Hz comb with offset of 0.5 Hz)
Figure 4 - 1300-1400 Hz sub-band (shows how clean the noise floor is away from 8-Hz, 16-Hz lines at high frequencies

Attachments:
* Zip file with miscellaneous sub-band spectra (with line labels)
* Flat-file list of lines marked on figures