[Betsy Travis Arnaud]

Today, since BSC2 chamber was accessible, we checked the polarity of the four magnets located on the second mass (M2) of the beamsplitter with the electronic polarity tester.
As we were expecting (see 7693), three of them were flipped (UL UR LR), so Betsy reversed them as in E1100108.

Also, we took the serial numbers of the 10 bosems. They are referenced in the updated chart in E1200343

Attached are some nice pictures of ITMX ETMX BeamSplitter and the baffles

To reproduce the 2.8 problems seen on H1 today, we reconfigured the /etc/init.d/mx_stream startup script to only use card0 10GE card on x1dc0. Front ends still have unique end-point identifiers (line number in rtsystab file), but are now not split over the two 10GE cards. Once this was done the DAQ data problem seen on H1 was reproduced on the DTS.

We (Cheryl, Corey, Keita) have been cleaning HAM6 in-chamber optics for a while and finally we've pulled first contact today. Most of them were beautiful but one of 2" high reflectors, E1100048 SN 1042, was rejected because it had two major defects at about maybe half diameter.  The first picture shows the entire mirror surface in which the ring structure is apparent. The second is just a zoomed-in view that shows both the ring and scratch/dig next to it.

Right after pulling the first contact the ring and scratch/dig were both visible without any special lighting. Since I wasn't able to move them by a gentle pushing using a wipe, and since they were close to center, a second coat of first contact was applied, but nothing changed. After pulling the second coat, methanol wipe was attempted, which removed  some residual first contact and made the scratch/dig thing less visible. The picture was taken after wiping.

Prior to this inspection, nothing touched the mirror surface in the cleaning process except for barrel wiping and first contact application, and it's not clear if the defects existed prior to cleaning.

As ETMX comes to life it is timely to remind everyone that the IOP Sus Watchdog on that system is AC triggered only. The DC component has been removed. I've attached a snapshot of the h1iopsusex model 

Insulation Removal crew at X-arm
Work on PSL rack (DC power distribution) – Filiberto
 H1 RCG upgrade – Dave B.
Cable work at TMSX and End X - Corey
ACB work ( ITMX pacing item )  at LVEA – Thomas/Gerardo
Witness plates work in BSC1/2/3 at LVEA - Betsy
BSC9 mostly rebalanced – Jim W.

BSC9 was floated, balanced and made to be mostly well-adjusted today. I say mostly, because some of the lock/unlock shifts are not as tight as I would prefer (we are just nudging the limits of the specs) and we are waiting for a response from higher ups on a request I made for payload change (shifting some wall mass up onto the keel). I left the ISI locked while Jason makes IAS measurments, and any changes to the ISI made from here on out shouldn't affect the optics position.

On h1conlog:

13:14 Stopped conlog-1.0.0
Renamed MySQL database 'h1conlog' to 'h1conlog-1.0.0'
Created new MySQL database 'h1conlog' (has different tables from previous)
Installed and started conlog-1.1.0

Web interface is available from CDS workstations at http://h1conlog

Still in beta testing

Greg had noted that some of the DAQ Frames meta-data is incorrect. I made the corrections in the h1fw0 and h1fw1 configuration files (daqdrc). These changes went in as part of the DAQ restarts during this morning's work.

Running framecpp_dump_objects on h1fw0's science frame shows the corrected settings:

nameDetector: LHO_4k

latitude: 0.810795

Rolf, Jim, Dave

Short story, we installed RCG2.8, we found problems which could not be fixed quickly, we backed out to 2.7.2

The following systems were not changed during the 2.8 testing: h1psl front end, the DAQ code, mx_stream, mbuf.

All front end models were recompiled against 2.8. Local changes were found in h1hpibs, h1hpiitmx, h1isiham6, h1susitmy (the HEPI models showed major changes compared to SVN).

All front end models except the PSL were restarted with the new 2.8 versions. The DAQ was reconfigured to remove all the EDCU INI files relating to front end channels (only non-FE EDCU channels were being acquired, e.g. Vacuum and FMCS).

We found that running the h1iopsush2a model caused corruption of the DAQ data stream from the front ends to the DAQ Data Concentrator. Rolf tried various tests but no quick solution was found. With time running out we decided to back out the 2.8 models and reinstall the tag2.7.2 models.

I ran an "install world" make in the rtbuild-2.7.2 area, so models were not recompiled against 2.7.2, existing binary code was re-installed in the target area.

We ran into safe.snap restoration for the following models: h1hpietmy, h1isibs, h1isietmx, h1isietmy, h1isiitmy, h1pemey, h1peml0. In these cases they were manually restored to this morning's settings before the models were stopped.

To test RCG2.8 we recompiled dataviewer, the new version is still installed as it is backwardly compatible.

EDCU for Beckhoff C1PLC2 was edited to remove two channels (H1:LSC-REFL_SUM_A,B_OUTSW) which appear to have disappeared.

Since we have access and I was in-chamber anyways, in:

• BSC1, I swapped the witness plate directly that was under the ITMy with a fresh one - see T1300874 for eventual analysis of the removed wafer

(2 more plus 2 1" optic samples were left alone for posterity)

• BSC2, I swapped the witness plate that was directly under the BS with a fresh one - see T1300875 for eventual analysis of the removed wafer

(1 more plus 1 1" optic sample were left alone for posterity)

• BSC3, we added a fresh witness plate (none previously in this newly populated chamber).

(Corey G, Jim W)

With a window of opportunity to work in BSC9, I hopped in chamber and Jim worked from up top.  Following the Cabling document (D1300007), Flange layout (D1003081), and using my BSC 9 Cable Table (alog), I went about checking & connectiong some cables to the chamber.  While doing this found a few issues:

1)  TMS SUS cables needed to be "turned around".  The end with "ears" was originally on flange side, and the cables could not be connected with these large ears on.  Luckily, fixing this required just flipping the cables around.  Confirmed that we now have real signals on the TMS medm.

2)  While connecting the Beam Diverter cable (D1000223 s/n S1202656) to the flange, I appear to have galled one of its set screws.  The cable is well seated and the other set screw is fine, but one of the set screws feels pretty bad. 

3)  The ISC QPDs are extremely important, and one thing I DID NOT want to do is fry these guys buy connecting them to the wrong flange.  So, I did not plug the QPDs (I later found out that the dirty-side cable aren't connected, so I could have connected them).  One other issue came up here.  Each QPD cable shares flange with either a Beam Diverter or Picomotor.  We are pondering the idea of whether we can put BOTH QPDs on one flange and the Beam Diverter/Picomotor on the other one.  This could help prevent us from accidentally frying a QPD.  We're still waiting on this per an email Keita sent out to all interested parties. 

was upgraded to V3 including software.

The three slow controls computers (Beckhoff) have been setup to automatically restart. They will continue at the point where they were turned off. This includes the TwinCAT system manager, all active PLCs and the TwinCAT ioc. (The TwinCAT ioc exports the TwinCAT channels into EPICS.) For configuration details look at section 4 in T1300175. After a power failure the system should now come back fully without manual intervention.

The DTS iMac workstations (running OS X) now run Matlab 2012b by default.

Today's major activity was the installation of the Cartridge into BSC3.  This started roughly late morning and was completed by 2:30-ish. 

Other Activities Of The Day:

Doug tried taking measurements to look at BSC3 in the morning (but wasn't able to due to interferences)

Work on X1:  Ed Watt removing insulation & inspection (not sure if this started today...they had mask-fittings in the morning and then they need to set up lighting to begin work)

Waiting to hear back from ISC regarding EX work (mentioned in morning meeting).

Dust Monitor continue to exhibit "noisy" behavior and alarm quite a bit due to a "step up" in counts (noted by Patrick & Jeff B.) coinciding with software change last Tues.  Unless something is changed, may be worth it to change alarm levels on these guys (I'll be on shift again on Thurs, and change levels if situation doesn't improve).

HAM2/3 ISI going up & down (Arnaud & kissel)

Contractor here to service tanks at 9:21am

Purge Air check at EX & LVEA (Gerardo)

Working with FSS (Stefan after talking with Rick)

Testing Oplev/Pcal templates (Rick/Craig)

  (Jeff B & Andres R)  

 We took the first set of undamped transfer functions for H1-OMC this afternoon. I’ve posted the results in the attached files. Comparison to the results from LLO testing looks positive. We will wait for Stuart A and Jeff K to comment before proceeding.    

Apollo (Bubba, Randy, Scott, Tyler), MitchR, JimW

BSC3 cartridge is in the chamber. No issues. We even learned from last time and put the covers on tighter this time. The quad is uncovered (just the sock is removed, I wasn't brave enough to touch anything else), so SUSsers can inspect at their leisure.

[Cheryl, Stefan, Sheila, Kiwamu, Joe, Paul]

The isolation ratio was calculated using both references for the rejected beam power (see Stefan's aLOG entry 7934), giving results different by 3dB.
Both are above the requirement of 30dB though.

The pick off beam splitter on the PSL table was characterized using power-meter measurements as follows:
Power in = 109.8mW
Power reflected = 38mW
Power transmitted = 67.8mW
R=0.3461
T=0.6175
L=0.0364

The first FI ratio calculation is made using the FI rejected beam power measurement on ISCT1 and the non-rejected beam power measurement on the PSL table.

In this case both measured beams pass forward through the IMC, through the FI, reflect off the PRM, and pass through the FI again before taking different paths (see attached drawing for measurement locations).

From this point, the rejected beam passes a R=90% BS and two 50% beam splitters before being measured on ISCT1. The power of the rejected beam just after the FI is therefore calculated as 6.94mW / 0.1 / 0.5 / 0.5 = 277.6mW. This is actually rather low considering that the power into the IMC should be around 555mW (1000mW*0.9*0.6175). Perhaps there was another 50% beamsplitter unaccounted for in the path somewhere? It's possible that some power is lost in the power control stage on the PSL just before the periscope, but I didn't think it shouldn't be as much as 50%. In this calculation, however, the isolation ratio inferred is unaffected by any loss at the power control stage because that stage is common to both the non-rejected and the rejected beams.

After returning through the FI, the non-rejected beam passes backwards through the IMC. The forward throughput efficiency of the IMC is taken as 94.25%, obtained from observing trends in the IMC REFL PD power (though this does not account for losses inside the IMC). The return efficiency is taken as the forward efficiency multiplied by the average x/y overlap of 94% between the measured mode in HAM1 (see entry 9750 and comments).
The beam then passes back through to the PSL and is reflected off the 34.6% reflective pick off BS. The beam does pass back through the power control stage, however it should have optimal polarization to pass this stage with high-efficiency, so this is not taken into account here.
The non-rejected beam power just after the FI is therefore calculated as 37uW / 0.9425 / 0.94 / 0.3461 = 123uW.

FI isolation ratio = -10*log10( non-rejected power / rejected power) = -10*log10( 123e-6 / 277.6e-3 ) = 33.5 dB

The second calculation is made using the other measurement of the input beam power on the PSL along with the non-rejected beam power measurement on the PSL table.

The non-rejected beam just after the FI is the same as before: 37uW / 0.9425 / 0.94 / 0.3461 = 123uW

From the PSL pick off beam splitter direct reflection point to just after the FI on the return path from the PRM, the rejected beam passes the pick-off BS (picking up a factor T/R = 1.7842 in power from the measurement point), the IMC in forward transmission (94.25% throughput), the FI (97.8%), reflects off the PRM (96.9%), and passes the FI again (97.8%).
The rejected beam power just after the FI is therefore calculated as 339mW / 0.3461 * 0.6175 * 0.9425 * 0.978 * 0.969 * 0.978 = 528mW

Calculating the isolation ratio with these numbers gives us:
FI isolation ratio = -10*log10( non-rejected power / rejected power) = -10*log10( 123e-6 / 528e-3 ) = 36.4 dB

This is quite a significant discrepancy between the two values for the isolation ratio. I am more confident in the 33.5 dB number though, because the measured beam paths have more in common in that case (especially the final power control stage). The 36.4 dB number is susceptible to any other losses in the IMC input beam path, such as the final power control stage before the periscope.