Over the last few days I've been taking some passive noise spectra of the ISI-CPS on HAM6 to try and determine what the best grounding strategy is (Jeff made a nice cartoon of the options in T1300871).

Along the way I found out a few things

  1) The HAM 6 CPSs had two problems that canceled each other out

                 There as a master in each crate  (the box near the chamber that hold the CPS controllers)

                 and the cable which brings the sync signal from the power board was either bad or plugged in backwards (it isn't keyed)

                I tunred one of the masters into a slave and replaced the cable

  2)  All of the racks that I have tested have there chasis grounded, so placing them on a cable tray creates a ground and possible ground loop.

  3) Currently it is pretty likely that ALL of the CPS that are installed have grounds in the electroncs room rack AND at the chamber (Ground Loop Gaore)

  4) The resistance to ground from the power cable ground to the chamber is 0.6ohms

  5) the sync cable carries a ground from one rack to the next

 After fixing the problems I took spectra under three conditions

   Multiple grounds (electroncs room and chamber) these were bad

  Single ground in the electronics room, red and green lines in the attached png (clean room on/off are the differences)

  Single ground at the chamber, blue lines in the attached png

   Given that set of data i think that we should plan on converting to a single ground at the chamber.

   The attached pdf shows one spectra converted to m/rthz and the expected noise (we have measured something close to the expected noise on the bench for every unit in use)

  I don't really know what to say about this except yuck

(Stefan, on Jeff's computer)

The FSS wasn't locking anymore, because H1:PSL-FSS_TPD_DC_OUTPUT fell below the threshold value of 0.5V. Attached is a 90day trend of the  H1:PSL-FSS_TPD_DC_OUTPUT and H1:ALS-C_FIBR_INTERNAL_DC_POWER. Both channels thow the same trend, i.e. the power loss is real.

For now I lowered the threshold to 0.4V.

• Pitch: 635 µrad down
  • Target: 360 µrad down (actual req. pitch is 8 µrad down but we have to correct for the First Contact on the optic to the order of 352 µrad down, leaving a total desired pitch of 360 µrad down)
  • Tolerance: ± 10 µrad
• Yaw: 940 µrad CW
  • Target: 0.0 µrad
  • Tolerance: ± 10 µrad

With the pitch only off by ~300 µrad after simply releasing the optic, no rough alignment is needed.  Now I need to correct the position errors from alog 8116 (no change with the suspension being free) along with the above yaw with the SEI crew.  Once this is done and SEI can finish final ISI payload and balancing we will fine align the ETMx pitch.

The REFL(AIR)_A_RF9 I&Q readback cables which are pacthed into the whitening chassis were installed.

Jeff B will take the ops chair this afternoon.

** We've started strip tools on a TV screen and on an ops workstation screen to monitor the pair of vacuum gauge readouts on both ends of the X1 arm section (between the CS and MX) where insulation is coming off.  These are the PT-343 and PT-144 cold cathodes. 
** Hugo will make remote measurements on HAM3 this afternoon.  We're not aware of other HAM3 work that would conflict with this.
** Filiberto worked on ISC cabling in the racks near H1 PSL this morning.
** Gerardo and Thomas have been working on the ACB at the LVEA test stand.
** The ETMX and TMS speedometer needles noticed Betsy's entry into the chamber at EX.
** Intermittent dust alarms in the low hundreds (3um) have occurred on the vac prep and diode room dust monitors through the morning although it seemed that people were not in these spaces.

Last night at about 7:45, Rich and I moved the beer garden dust monitor into the BSC3 clean room, which had no dust monitor.

[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).