no restarts reported.

D. Hosken, G. Grabeel, T. Vo

We were able to fix the ring heater chassis EtherCAT wiring by referencing the drawings.  We initially turned both ITM ring heaters to 30 Watts at 6:46 PM PT but it seems as though the maximum power that the drivers can put out is ~15-16 Watts so we changed the script that Greg wrote to run the power at 13.5 Watts during the high power portion and .5 Watts in the low power portion.  I'll come in tomorrow morning to run some trends and take some measurements.  John verified in the first hour that there were no spikes in pressure.

It looks like we will need to go in chamber at end X to fins IR on the QPDs.  I searched for the beam today by locking ALS, and moving the picomotor for M4 to toward the position that Kiwamu et al found in February (alog 10091).  This was fine for the Y direction, but in the X direction I only got about a quarter of the way toward the old position before the green transmitted power started to drop.  One theory is that this could be the green clipping on the mount for M4 (TMS table drawing).  After a little bit of searching around, I decided move the picomotors back to the position that we had set them to to restore the beam on the table. 

The positions used to get IR onto the LSC PD from February until yesterday were 9267 X 1665 Y for M4.  Today after moving the picomotor around quite a bit, I needed to use 27357 for X and -12616 for Y to restore the beam to the same position.  So these numbers are meaningless as references. 

If you remove the snout from the LSC TRX PD in air, there are two brighter green spots (with two very faint spots below them to form a square, right now the lower ones are clipped upstream).  The one that is slightly brighter and on the side of the PD face that is closer to the chamber is the one that is co-linear with the IR, and could be used as a reference if we decide to send IR into the chamber from this path to align the QPDs. 

Yesterday Daniel noticed that the beam was clipped on EX WFSA, but the beam was not centered either and we were in the middle of IR beam finding. Today I centered the beam and it was still clipped because the beam was coming to the WFS head at much shallower angle than it should be. I fixed it by tilting the WFS head.

I and Daniel went to EY and tested WFSB using AM laser, and we saw that some of the channels were a factor of 5 or so smaller than the others.

Eventually we tracked it down to the WFSB whitening chassis (S1101602) though I thought it was working OK on Thursday (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12138),

We tested S1101601 that was pulled out earlier this week that was suspicious unit but was never conclusively diagnosed bad, and it didn't work. So we got another spare unit (S1101638) from the corner station and  put it in.

What are in use now: S1101600 for WFSA, S1101638 for WFSB.

Bad units: S1101601, S1101602, S110163.

Bad ones are put on a table in EY.

model restarts logged for Fri 30/May/2014
2014_05_30 14:42 h1fw0

unexpected restart of h1fw0

John Worden, R. Weiss
Vibration measurements of the beamtube with the new R10 insulation and aluminum jacket were made and described in the
appended document. The new insulation reduces the acoustic coupling to the beamtube but not as well as the initial insulation.
The data enables a more detailed estimate of the phase noise from the beamtube motion due to the faulty HR coatings of the new 
test mass mirrors. The DCC number of the document is T1400384.

Sheila & Dan

We marked the two IM4_TRANS beams (PRM_REFL and IO_TRANS) on the wall of the LVEA today.

To be clear: both of these beams are transmitted through IM4.  One is from the beam leaving the IMC, the other is the reflection coming back from the PRM.  The IO_TRANS beam is in the -X direction on the wall.

We noticed that there are also two green beams very close to the IR beam reflected off the PRM.  Only the Y-arm was locked at the time, so this must be the faint green reflection off of PR2 from the Y-arm.  We might want to use these as a reference for the BS alignment in the future.

(Keita, Daniel)

Today we measured and adjusted the gain/phase of the WFS RF signals. WFS_A looks fine, but WFS_B has segments 3 and 4 which are ~10x smaller than 1 and 2. Engaging DOF4 did result in a stable feedbakc but with a rather large offset. We added an offset to segment 4 of WFS_B to recover. Adding DOF3 did not result in a stable feedback.

Playing around with the individual pit/yaw offsets and the WFS DC centering one can find feedback topologies with all 4 DOFs engaged. However, they are susceptible to disturbances.

This RGA is set up to scan every 60 minutes for this weekend in order to capture data during the Ring Heater "burn".

Yesterday night, after Richard re-rerouted the end-y ESD cabling, I took a L2L transfer function to check the length drive with the ESD. It seems to behave nicely, and similarly as EX. The attached plots shows the comparison of Ex and Ey TF in m/cts.

The measurement was taken using the same dtt template as for ETMx. The arm was locked without the slow control engaged. Sensor used was ALS-Y_REFL_CTRL (in um). Measurement lives in

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ETMY/SAGL3/Data/2014-05-29_H1SUSETMY_L3_L2LPY_SweptSine.xml

CO2X
 - Zero-ed out the QPD segments to compensate for the differences in individual quadrants.
CO2Y:
 - Zero-ed out the QPD segments to compensate for the differences in individual quadrants.

HWS:
 - Built up HWS camera for both X&Y sides of the table, able to get serial connection and read out the status information
 - End station HWS table inventory progress: Cables and optics completely kitted.
 - Need a re-do of positioning of the HWS-Y camera because of interference with the table enclosure.

RH:
 - Prepared for a 24 hour ITM ring heater test. 30 minutes on full power (~30 Watts) and 30 minutes off. We'll do this work on Saturday and Sunday.

I put together this  T1400371 procedure for aligning the 90/10 BS in HAM3. It describes the way they did the alignment at Livingston (Option 1, green beam from HAM1, IOTR table would need to move) and the way that Keita would like to do it here (IR beam from HAM3, no need to move IOTR).


All the parts needed are "mostly" ready. Here is a summary:

- BS 90/10, post, clamp (mirror is cleaned and installed in mirror mount)
- V-shaped dump, post, clamp (ready)
- IR laser diode source (in optics lab)
- spare clean sled (in optics lab, can be used to mount the laser source and collimator in HAM3, if needed)
- 2 spare 2" HR 1064 clean optics (on optics table in OSB optics lab - I left there also a clean 2" HR 532)
- Missing: IO style posts for mounting the steering optics (Corey and Cheryl working on it)

Operators Log 05/30/2014
Day Shift Summary
LVEA Laser Hazard 

08:49 Filiberto – To End-Y working on cable repairs
09:00 Kyle - Moving RGA cart to BSC7 area
09:00 Hugh – Working on external cabling at HMA5/6
09:35 Dave & Thomas – Working on TSC-X and Hartman tables
09:45 Rite Choice on site to pick up pallets and scrap wood 
10:04 Keita & Sheila – Going to End-X
10:06 Kyle – Going to End-Y to recover test equipment
10:45 Betsy & Travis – Working in the West Bay cleanroom
12:49 Karen – Going to End-Y
13:08 Betsy & Travis – Working in the West Bay cleanroom
13:17 Dave – Working on TCS-X and Hartman tables
14:18 Karen – Back from End-Y
15:22 Betsy & Travis – Out of the LVEA

Arnaud may run some measurements on the SUS in HAM5 so I delayed these to start later today.  Running on OPSWS8