Biggest thing - Y arm is open!
- Kyle to EY to burp GV18, now GV17 and GV18 are green

Other activities:
- crane inspectors here - DHA Assoc.
- reboots to ITMY and BS front end - found dead this morning
- Patrick to EX- dust monitor at EX attempted but yet to work
- Pablo to H2 enclosure for pcal work
- Shiela to EY for HIFO
- MichaelR to the PSL enclosure to install a new flow sensor and restart laser - currently laser is off

In process:
- Mike Landry currently visiting EX

Leaving GV6 soft-closed until tomorrow

This plot shows the opening of GV18 at the Y END station. The RED shows the pressure falling after the transition to the large ion pump, the spike up is the valve opening.

Green is the pressure in the 80K pump.

Jax, sheila

The power out of the green laser has dropped to around 9mW, (12mW after adjusting the temperature and diode current), while there were  42.5mW a few weeks ago . Jax and I tried restoring the laser to  these settings  and saw that there were only 9mW coming out of the laser.  (jax has now set the crystal temp back to 32.8C, the way we found it)

The IR power out of the laser seems to explain the drop.  Using the values from   this alog , if nothing other than the IR power had changed we would have (22.9/(1125)^2)*(800^2)=11.6mW of green.  

On the reflected PD, we only measured 10uW, I am not sure if there have been some changes to the table layout that have reduced that power even further.    

I originally went to the end station to calibrate the green laser power PD, it is a PDA100A (transimpedance 1.5x10^4 Ohm on the 20dB gain setting), the responsivity I measured after realigning it was 0.687A/W. The PD is on one of the beams rejected by the faraday, there are 197uW on the PD when there are 12mW transmitted by the Faraday so the splitter ratio for this PD is 1.6%.  Since there is only 10uW on the LSC PD, I couldn't calibrate it.  

The Apollo crew took the cleaned FFUs down to X End this morning. A hard cover was installed on the beamtube at the spool opening. The BSC cleanroom was moved from the spool area over BSC5 to allow as much space as possible for getting the CPB CR ceiling grid into the VEA. The Test Stand was craned out of the roll up door area to the far side of the beamtube. The Test Stand, Work Space and one Garbing/Staging cleanroom were nested into the corner between BSC5 and the emergency exit. With the space cleared, the CPB CR ceiling grid was moved into the VEA. The grid was attached to the crane so that it could stand vertically in the available space for cleaning. Cris and Karen completed two cleanings of the grid. Ken worked on electrical supply for the CPB CR, which runs on 277 volts. The first load of items that need to be transported from the LVEA to X End was hauled down and a second load list prepared.

I tried to install another dust monitor at end X to be placed inside the receiving bay. I connected two 25 ft. DB9 serial cables together and connected the dust monitor labelled 'U' to the unused port on one of the break out boxes. The other port is used by the dust monitor at location 1. However, this caused both dust monitors to return garbage characters. I tried turning off and disconnecting the serial line (at the breakout box) for the dust monitor at location 1, but the new dust monitor continued to return garbage. I removed the new dust monitor and reconnected the one at location 1, but moved it so it could be easily placed on the other side of the roll up door and inside the receiving bay. This is back to the original configuration and communicating correctly.

I had to restart the IOC for the dust monitors at end Y, after the Comtrol serial to Ethernet box momentarily lost power.

END Y pumpdown - 40 days shown Main Turbo only.

Shown are two pressure gauges on the vertex volume in the LVEA. 20 days are plotted.

The steps down in pressure are due to the addition of main ion pumps and finally the addition of the YARM 80K pump. There appears to be little or no slope so we are suspecting a leak somewhere. Once the H1 laser is restored to operation we will proceed to opening the LVEA and the Yend to the tube. Leak checking will proceed in parallel as we do not want to leak into the tube for an extended period of time.

The pressure in the 80k pump(CP1) is currently 3e-8 torr - this is representative of what the tube will be exposed to. Tradionally we have been closer to 1e-8 when we open to the tube.

[Mark B. Arnaud P.]

Models for lsc, mc1 and mc3 have been modified after Keita and Chris reported an issue (aLog 6510)

lsc model : edited h1lsc.mdl to add IPC ouputs H1:LSC-MC1_L_SUSMC1 and H1:LSC-MC3_L_SUSMC3 (first screenshot)

mc1 and mc3 : edited h1susmc1.mdl and h1susmc3.mdl to receive the new LSC signals and some ASC IPC signals already being generated by h1ascimc.mdl (second and third screenshots)

The L/P/Y values are now set to zeros, since no signal is being sent from LSC (fourth screenshot)

The h1susbs and h1susitmy models stopped running at 15:06:44 PDT May 28, due to an ADC Timeout error.  The h1iopsusb123 model had a large IRIG-B error.

Killed models, restarted the IOP, and then started the h1susbs and h1susitmy models.  They all started without error.

I have fixed the broken cable (alog #6514) which is for the segment 2 of IMC-WFS_B. So next time when the beam is available one will have to re-adjust the demod phase for this segment.

Michael R, Rick S, Ollie. P

Our spare diode chiller died over the weekend, bringing down the PSL. We believed we traced it back to a broken water sensor inside the chiller. After removing the part we verified we could not spin the turbines inside it and could not get a signal out of it. We have ordered a new part which should arrive tomorrow. As both our diode chillers are down at the moment, the PSL will remain off until this new part can be installed.

The orientation of the QPD for PR3 is:
 
| 4 | 1 |     | 
|---+---|     | +PITCH      <--- +YAW 
| 2 | 3 |     v 
 
This is different than the test mass optical levers because mechanical interferences do not allow us to mount the QPD in a consistent orientation. The OL2EUL matrix is set up to reflect the SUS convention for pitch and yaw as shown above. 

I took measurements two separate ways in order to map out the linear response of this optical lever: 
1) The first was the standard usage of the micrometer on the stepper-motor which the QPD is mounted to and I was able to correlate the pitch and yaw signal on the QPD to what we would see in the tilt of the optic. 
2) The second method is the use of the actuators and OSEMS on the suspension and correlate the readings on the QPD and the readings on the OSEMS. PR3 is one of the few optics which allow us to make this measurement since there are OSEMS on the bottom stage that directly measure the main optic. 




Graphs are attached to show the results: 
Micrometer_measurements:
slope_p = 38.86
slope_y = 38.53

OSEM_measurements:
slope_p = 33.29
slope_y = 31.64

Comparing the two:
Pitch: 100*(38.86 - 33.29)/38.83 = 14.345%

Yaw:   100*(38.53 - 31.64)/38.53 = 17.882%


Although both of these methods yield similar results, I'm not sure what uncertainties would be found in exploring the shadow sensors and the actuators.  Calculating the uncertainties explicitly with the manufacturer's tolerance and estimating the lever arm uncertainty, I get the uncertainty of using the micrometer to measure angular displacment at 2.5%.  Note: PR3's optical lever receiver is almost directly above the transmitter (zeemax says it's 89.99 degrees from the horizontal line); this could explain why measurements in pitch agree much better than yaw. All in all I have added the gain to the MEDMs:
- H1SUS-PR3_M3_OPLEV_PITCH_GAIN = 38.86
- H1SUS-PR3_M3_OPLEV_YAW_GAIN = 38.53

All measurements were done with HEPI locked and the ISI damping with the ST1 DAMP loops.  Suspension damping was also turned on at the top M1 stage, for the actuation to get the OSEM measurements, I used the top mass actuators as well.

As a bonus treat, I've attached a calibrated spectra of the optical levers and the OSEMS.

Activities for today:
- Craig C, at X-End Station, p-cal work, prep.
- Rick S. at X-End station, p-cal work, prep.
- Filiberto C. in the LVEA to run cable for ITM-Y spool camera.
- Richard M. in the LVEA to help out with camera work.
- Michael R. to PSL, PSL was down for today, he is looking into it, cooling issues.
- Cheryl V. to LVEA, IOT2L measurements.
- Pablo doing work inside the H2-Laser enclosure.
- Kiwamu to LVEA to fix cable at table IOT2L, done.
- Apollo working in the LVEA and at the X-End station, cleanroom work, among other tasks.

Vendors:
- Paradise water in site to deliver water.
- Monthly test from Hanford, no action required, emergency sirens test happened between 12:45 pm and 1:45 pm.
- Praxair, one load delivery of LN2, CP3, no alarms, currently at 92.7%.

PSL will be down for the rest of day.

Waist is 526mm from the second lens, L3.

Starting another set of M0/R0 TFs on ETMx, this time with the new M0F1 OSEM and with damped TFs as well.