(Chris, Kiwamu, Stefan)

We started off by relieving all MC offsets to alignment sliders, and setting some electronics offsets on the MC board. Next we aligned the whole HIFO-Y (green pointing into the arm, PR3 for green transmission, PR3 & IM4 for maximum IR fringing, PRM for maximum power recycling fringing).

Next we peaked into HAM1 and identified the REFL beam - it hits the vacuum chamber right next to the view port. So tomorrow we will have to do another incursion to HAM1 to get that beam out.

Next we touched up the beat node on ISCT1. With 0.1mWatt into the beam combiner from the SHG, and 1.4mWatt from the y-arm, we expected a maximum of 220Vpkk (assuming 1kOhm transimpedance and 0.6A/W). we got 150mVpkk.

Next we checked out the electronics. The cable from the common PD went to the differential PFD (Phase Frequency Discriminator), and vice versa. So we switched the cables. Next we noticed that the Bekoff control between COMM and DIFF is also switched - this needs to be fixed.

Next we started playing with the feedback to the IMC and PSL. We were able to get the PFD off the rails by some slow feed-back to MC2, but unfortunately we have no way of doing this without already putting a signal into MC2 length. Next we tried to simply increase the the REFL_SERVO_SLOW to MC2 length gain, but we get an oscillation at 6Hz to 8Hz (depending on the slow integrated). It seems like we are missing some filters in the chain...

Looking at DTT spectra of H1:IMC-L_OUT and H1:LSC-CARM (both frequency sensors) we find that the PFD is still in the non-linear regime. The 8Hz signal upconverst noise everywhere, dominating the frequency noise in H1:IMC-L_OUL (the two signals look identical, with opposite sign).

So we have a chicken and egg problem: no signal from ALS_COMM without feed-back, and no feed-back without checking that the signal makes sense.

In other words: It is time for a complete IMC and ALS model in MATLAB - otherwise we are running blind.

Apollo crew, PabloD, MichaelR, RickS

Today, we installed the Pcal in-vacuum periscope structure at Xend.

Everything went smoothly (see photos)- uncrate, crane from East to West side, set on Installation Entry Pad, slide into adapter on "teflon highway."

We left the structure sitting inside the adapter (it is very stable in this configuration and cannot tip over due to mechanical interference).

Tomorrow, we plan to start work early in hopes of finishing up tomorrow, leaving the structure in its staging position awaiting the Cryopump/Manifold baffle installation.

Properly-fitting flange protectors were picked up from the machine shop today.  We will install them as soon as they are ready, hopefully tomorrow.

(Alexa, Jax)

We calibrated the green trans PD, channel name H1:ALS-C_TRY_A_DC. 

At the photodiode, the power measured was 0.192 mW. The channel voltage read 2.9V with gain set to 20. The corresponding responsivity is 0.755 A/W.

We also installed a lens (PLCX-25.4-51.5-C-532) in front of this PD since beam size was comparable to PD size. 

These are the latest TF/Spectras Test Results for HSTS I1-SRM

As of right now, the ETMx QUAD lower structure has been moved into the test stand cartridge assembly area, masses have been removed, the chains have been split, and have been parked on their respective stands.  The ring heater attachment can take place anytime in the next day or so, followed by installation of the glass test mass and penultimate mass hopefully by end of the week.  The welder and chiller lab has been set up and all systems tested.  Practice fiber welding is underway. 

- welding work at EX
- P-cal work at EX
- ISI testing
- IMC work that kept it unlocked for most of the day
- IOT2L work to align MC Trans - unfinished!
- high counts of dust in the clean room/garb room by HAM2 found
- DAC reboots

Currently:
- p-cal crew at EX
- welding group at EX
- search for beams at HAM1
- temperture over 75 degrees F at EX in the VEA

For a while the 227b dust monitor in this clean room has been reporting high counts. (see attached plot back to May 15th)

One theory was that this may be due to a missing prefilter on one of the HEPA units. (alog 6375)

This cleanroom is split in two, with a garbing area on the HAM2 side and cleaned parts on the other. Each half has two HEPA units. The HEPA unit with the missing prefilter is over the cleaned parts. The 227b dust monitor is also in this half.

This morning I took further measurements with one of the HHPC-6 particle counters. In the cleanrooms over the two test stands, and the larger one closer to HAM3, the counts were flat zero.
The counts I measured in the small cleanroom with the HHPC-6 appeared to confirm earlier counts with the 227b. The counts were elevated in both halves. I did not see a noticeable difference directly under the HEPA unit with the missing prefilter. However, inside the cleanroom near the floor of the entrance to the gowning side, the counts were repeatably and exceptionally high, I believe up to from 480 counts at 0.3 um to 160 counts at 5.0 um.

I plan to do more detailed measurements tomorrow.

The seismic BS front end h1seib2 crashed after it was "daq reloaded" (following a hand edit of its DAQ INI file).  This caused most of the corner station front end models to be marked as 0xbad by the DAQ. I did the following

• took h1seib2 out of the Dolphin fabric using h1seib1
• power cycled h1seib2
• performed a start_streamers on h1susb123

At this point all the front end models went into good 0x0 DAQ status. 

After power was restored, the h1iopseib2 model did not autostart, I restarted it by manually pressing the BURT button on the GDS_TP medm at the appropriate time. I was then able to start the models h1isibs and h1hpibs.

At this point the following models were reporting INI changes: h1isiitmy, h1isibs and h1isietmy with a DAQ status of 0x2000. I restarted the DAQ and all is now good.

Created new snapshots for mc1/mc2/mc3/etmy/itmy called "h1sus${optic}_lock.snap" representing the "lock" state of the suspension.

those can be recovered by going into the burtfiles directory

cd /opt/rtcds/userapps/release/sus/h1/burtfiles

and burtrestored with :

burtwb -f h1sus${optic}_lock.snap

I was up on the Mezzinine measuring for cables and noticed that the pumps were not turning.  No level trip, no VFD trip, servo running pushing max volts.  Richard reminded me of a problem that we should have corrected some time ago.  The output from the servo has 4 BNCs to the four pump stations.  There was a bad BNC that has shorted in the past and it did so again.  Once it shorts, no matter what the servo does, the outputs are shorted and the VFD gets zero volts hence no revs.  As soon as I unplugged the bad BNC they rev'd back up.  We took it back down and Filiberto replaced the BNC.  This should not happen again.  I may have bumped the cable and caused the short but I'm pretty sure it happened 10s of minutes before I was in the area.

The pumps went down at ~1818utc and the BSC2 HEPI moved a fair bit, several .001".  After the BNC repair I got the Pump Output back to operating pressure ~2040utc with the HEPI Actuators reaching equilibrium position a few minutes later.  The difference in before & after position at BSC2 was ~0 to ~600 counts, all less than 0.001".  Obviously a need for alarms--working on it!

(Chris, Alexa, Daniel)

We loaded the most recent LSC model from LLO. It includes inputs for the ALS channels as well as input from EY. It includes outputs to all suspensions controlled by LSC. The slow controls locking signals from the end ALS systems are now fed through the LSC input matrix and filter modules.

A new ISC model was loaded into EY. It has the following features:
- Removed remaining code related to green WFSs,
- Send slow arm feedback from the ALS REFL PHD locking to corner,
- Send transmitted power to corner,
- Added normalized sum for QPDs,
- Added communications library to interact directly with EtherCAT system, and
- Some filter and channel names have changed to make them more consistent between the slow and fast systems.

The EtherCAT computers ECATEX(Y) were renamed into ECATX(Y)1.

Duplicated channels in the EtherCAT system (SYS-COMM) were fixed. Some channel names had to be shortened as well. New DAQ ini files were generated and loaded for corner PLC2, EY PLC1 and EY PLC2. The auotburt files for ECAT systems were updated as well. They were copied into $(USERAPPS)/ecat.

A new subsystem directory was added to svn, $(USERAPPS)/als. All ALS medm screens have been moved over from the isc directory. So, more clean up work is still required.

New substitution rules were defined for ISC to allow parametrization of the end station screens. A list of example replacement strings can be found in $(USERAPPS)/isc/common/medm/isc_macro_subst.txt.

A large effort is underway to update all ALS and end station screens to use the new substitution rules. This will allow screens to work in both end stations without change. It will allow screens to work on both sites. And it will bring some order into the parameter names, so they can be used more consistently.

Attached are plots of dust counts requested from 5 PM June 10 to 5 PM June 11.

Both the dust monitor at location 14 in the LVEA (H2 PSL enclosure) and the dust monitor at location 16 in the LVEA (H1 PSL anteroom) are indicating calibration failures.

Attached are plots of dust counts requested from 5 PM June 9 to 5 PM June 10.

Both the dust monitor at location 14 in the LVEA (H2 PSL enclosure) and the dust monitor at location 16 in the LVEA (H1 PSL anteroom) are indicating calibration failures.