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.

Apollo will be modifying GV2 annulus external plumbing (same as GV1 and GV5)

After morning meeting, when the decision was taken to delay the PCal installation, we concentrated on other X End-related work. 
-The spool piece was moved from the VEA to X Mid.
-The ceiling framework from the Cryo-Pump Baffle (CPB) Cleanroom (CR) (henceforth referred to as the CPB CR) was moved into the High Bay this morning and taken down to X End this afternoon.
-A first-attempt cleaning process for fan-filter units (FFUs) from the CPB CR was agreed on. We may need to modify the process after we check FFU cleanliness.
-The 10 FFUs from the CPB CR were moved from the LVEA to the High Bay. A couple were eventually moved outside for blow-off with clean compressed air obtained from the Chamber Cleaning compressors.
-Bubba and I measured and took pix of the clear space from the spool area to the BSC cleanroom wall to ascertain whether it is possible to assemble the CPB in that clear and clean space (~7'x 16'). It would save us at least one cleanroom pick if this is plan is acceptable to the baffle types. Pix below.
-We provided some support to Rick and Craig for the PCal install tooling fit check.
-The PCal periscope was left in its crate but turned to a vertical orientation in the X End Receiving area and secured. This will allow staging to continue unimpeded by the crate but keep the periscope protected until the new install date, ~10 June 2013.
-I modified the ETMX Install Prep checklist. It is posted below for informational purposes.

1.	Fix and vet CPB CR (Jodi and Apollo)-Begin 28 May 2013
2.	Complete-Fit check PCal installation tooling (Rick and Craig)-28 May 2013
3.	Complete-Store PCal periscope vertically in X End Receiving area (Apollo)-28 May 2013
4.	Put hard covers on beamtube openings (Apollo)
5.	Drill holes in Test Stand  for SEI and SUS (Apollo) 28 May 2013
6.	Move BSC CR to BSC9-29 May 2013?
7.	Move CPB CR to X End and assemble over spool (Apollo)-Begin 28 May 2013: Ceiling framework
8.	Get BSC ISI and Quad into VEA (SEI/SUS/Apollo)
9.	Install and test leg jacks (Apollo)
10.	Move ISI-CPB jigs/tooling-garbing/staging cleanroom contents to X End (Apollo)-First pass list created
11.	Remove ISI Storage container top from building (Apollo)
12.	Move E-module and Spiral Staircase into VEA (Apollo)
13.	Remove door/dome from BSC 
14.	Place lower Garbing/Staging CR (Apollo)
15.	Assemble and place E-module including upper garbing/staging cleanroom (Apollo)
16.	Place and level Test Stand (Apollo/IAS)
17.	Clean Test Stand and cleanrooms: CPB, Test Stand, Work Space and lower G/S (Tech Cleaners)
18.	Fly ISI to Test Stand (SEI/Apollo)
19.	Move Test Stand CR over ISI (Apollo)
20.	Get ISI Storage Pallet out of VEA (Apollo)
21.	Place Work Space CR (Apollo)
22.	Week of 10 June 2013
a.	Welding Practice begins (SUS)-Move weld tooling , laser enclosure needed?
b.	Do PCal work at spool (Rick and crew-Apollo help)
-Remove hard cover from spool
-Install-Test-Turn parallel to beamtube
-Close-out check
23.	Level, balance and test ISI (SEI)
24.	Marry SUS to ISI (SUS/Apollo)
25.	SUS check-out (SUS)
26.	Assemble Bosch frame for TMS (before 17 June 2013-nominal date for telescope alignment to begin)
27.	Clean CPB CR (Tech Cleaners)
28.	Move CPB parts into VEA
29.	Assemble CPB and cover (AOS Team) 08 July 2013
30.	Install CPB (AOS Team)
31.	Orient PCal properly (Rick and crew)
32.	Remove dome and doors (Apollo)
33.	Insert ACB Assembly into beamtube thru open BSC door (AOS Team)
34.	Lower BSC cleanroom (Apollo)
35.	Install cartridge (SEI/Apollo)
36.	Raise BSC cleanroom (Apollo)
37.	Install walking plates (Apollo)

Two new DNS servers have been installed for the CDS network, ns0 and ns1.  These will be the (redundant) pair of DNS servers that will provide name resolution to all CDS hosts.  ns0 is configured as the master for the cds.ligo-wa.caltech.edu domain (only used internally by CDS), ns1 is a slave server for the same domain and will automatically receive zone updates from ns0.  Since a large number of workstations and servers are configured to use cdsfs0 for domain lookups, cdsfs0 will continue to serve DNS requests, but has been converted to be a slave server like ns1 so that updates only need to occur on a single server.  cdsfs0 was previously the master for the internal cds zones.  At some point in the future, this functionality will be turned off completely on cdsfs0.  The zone files themselves have also been refactored and cleaned up to correct some minor issues and facilitate ease of future maintenance.

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.