Very good isolation results were presented in aLOG Sensor Correction Results. During the test, the ISI was the only controlled system. The ISI is locked at DC to stage 0 but the HEPI structure (stage 0) can still wander around since HEPI is not controlled.

HEPI position control:
Since isolation performances of the HEPI are limited (amplification of the motion around the blend frequency and the HEPI sensor correction is not as good as the ISI one), it seems attractive to implement a simple position control to lock HEPI to the ground and steer the whole HEPI-ISI as desired.
In this case, the HEPI-L4C inputs of the super sensors are turned off (via zero gain filters for convenience) and no filters applied to the IPSs.

Then, some rudimentary isolation loops (couple of poles and zeros) were designed such that the UGF is 100mHz. This low UGF allows not changing the HEPI dynamics in the ISI control bandwidth (Low gain peaking between 100mHz and 30Hz).

At low frequency, when no control is engaged, the ground, the HEPI and the ISI are moving together. With the sensor correction, the CPS signals are added to STS-2 signal to evaluate the inertial motion of stage 1. But when the stage 1 of the ISI is driven, HEPI-stage 0 also moves (cf aLOG Feedforward and figure transfer functions from ISI to HEPI in attachment – H1_ISI_ETMY_Interraction_HEPI_ISI_20130530.jpg). Consequently, the stage 1 inertial motion is misevaluated since HEPI motion is not considered.
By increasing the UGF of the position control on HEPI, the HEPI piers and stage 0 are locked together and the stage 1 inertial motion evaluation should be better.

In attachment H1_ISI_ETMY_ASD_Stage_1_Z_Different_Configuration_20130522.jpg , spectra of stage 1 motion in the Z direction are presented in different configurations:
- ISI controlled + No HEPI control
- ISI controlled (with sensor correction on stage 2) + HEPI control (UGF 10Hz - super sensor IPS +L4C + Sensor correction)
- ISI controlled (with sensor correction on stage 1&2) + HEPI control (Position control – UGF 100mHz)
- ISI controlled (with sensor correction on stage 1&2) + HEPI control (Position control – UGF 5Hz)

It seems that controlling the HEPI using a “pure position control” doesn’t improve or deteriorate the isolation performance of the ISI (vs no HEPI control) but it’s simpler to implement than the regular L4C-IPS blend.
Isolation is better when the sensor correction is implemented via the stage 1 of the ISI. Increasing the UGF of the position control from 100mHz to 5Hz doesn’t seem to improve the isolation of the ISI.
 

I have enabled DHCP services on the two new nameservers ns0 and ns1; these will act as a redundant pair for DHCP services.  The DHCP server on cdsfs0 has been disabled, and will no longer be used.  Along with the change, the DNS server addresses supplied by DHCP have been updated to point to ns0 and ns1.  The ntp server address is also now sent in DHCP replies for those systems that can make use of it.

[Alexa, Kiwamu]

The h1asc model, which is something we haven't had before, got complied, built and installed today. Now it seems running fine. All the screens were adapted to the H1 convention.

A local mod:

We made a local mod in the PSL-PWR_REQUEST channel. Since we don't have the capability to do a PCIe communication to send some values over from another machine to h1asc0 we had to get rid of this part temporarily. The sceenshot below shows the modification point we made. We replaced the communication block by an epicsIn block which is accessible through a channel name of H1:ASC-PSL_PWR_REQUEST.

Here is the list that Bubba and I are working from to prep for install.
1.	Disassemble and clean CPB CR FFUs (Jodi and Apollo)-28 May 2013
2.	Complete-Put hard cover on beamtube openings (Apollo)-29 May 2013
3.	Drill holes in Test Stand  for SEI and SUS (Apollo) 28 May 2013-Bubba consulted with Hugh and Betsy
4.	Move BSC CR to BSC5-29 May 2013-Bubba WP-Hugh wants to delay move to BSC9 as long as possible for HEPI actuator work and Apollo needs it out of the way to get the CPB CR into the VEA.
5.	Remove PEM set-up (Michael L.)
6.	Move CPB CR to X End (Apollo)-Begin 28 May 2013: Ceiling framework to X End, Terry S. and Christina apprised of cleaning needs-Cris and Karen cleaned x2
7.	Get Electrical for CPB CR at X End (Richard/Ken)-29 May 2013
8.	Test  CPB CR FFUs (Jodi and Apollo)
9.	Assemble CPB CR over spool (Apollo)
10.	Get BSC ISI and Quad into VEA (SEI/SUS/Apollo)
11.	Install and test leg jacks (Apollo)
12.	Move ISI-CPB jigs/tooling-garbing/staging cleanroom contents-weld equipment/Genie/Ergo Arm-walking plates to X End (Apollo)-28 May 2013-First pass list created and sent to BG-Mick and Zack will work 29 May 2013
CPB-SUS list with pix created 29 May 2013 and given to BG-
13.	Remove ISI Storage container top from building (Apollo)-29 May 2013-BG will take measurements to see whether we can take the lid out later than this.
14.	Move CR from BSC5 to BSC9 (Apollo)
15.	Put CPStat on floor under CPB CR to minimize particulate.
16.	Move E-module and Spiral Staircase into VEA (Apollo)
17.	Remove door from BSC9 for PCal install
18.	Place lower Garbing/Staging CR (Apollo)
19.	Assemble and place E-module including upper garbing/staging cleanroom (Apollo)
20.	Place and level Test Stand (Apollo/IAS)
21.	Clean Test Stand and cleanrooms: CPB, Test Stand, Work Space and lower G/S (Tech Cleaners)
22.	Fly ISI to Test Stand (SEI/Apollo)
23.	Move Test Stand CR over ISI (Apollo)
24.	Get ISI Storage Pallet out of VEA (Apollo)
25.	Place Work Space CR (Apollo)
26.	Week of 10 June 2013
a.	Welding Practice begins (SUS)
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
27.	Marry SUS to ISI (SUS/Apollo)
28.	Level, balance and test ISI (SEI)
29.	SUS check-out (SUS)
30.	Assemble Bosch frame for TMS (before 17 June 2013-nominal date for telescope alignment to begin)-Hardware at VPW
31.	Clean CPB CR (Tech Cleaners)
32.	Move CPB parts into VEA
33.	Assemble CPB and cover (AOS Team) 08 July 2013
34.	Install CPB (AOS Team)
35.	Orient PCal properly (Rick and crew)
36.	Remove dome (Apollo)
37.	Insert ACB Assembly into beamtube thru open BSC door (AOS Team)
38.	Lower BSC cleanroom (Apollo)
39.	Install cartridge (SEI/Apollo)
40.	Raise BSC cleanroom (Apollo)
41.	Install walking plates (Apollo)

[Alexa, Kiwamu]

Since the main laser got back running (alog 6551) we attempted to resume the WFS commissioning this evening. 

However in the middle of acquiring the lock of IMC the reference cavity lost its lock and never came back again. It seems that the reference cavity got misaligned a lot so that the autolocker is unable to capture 00 mode. In fact it tries to capture the 01 mode instead. The alignment needs to be fixed.

MC1 and MC3 alignment biases:

We found that the MC1 and MC3 alignment biases had changed due to the restarting of the realtime model (alog 6531) yesterday. We brought the M1 alignment biases back to where they used to be before the restart. This recovered the alignment and we got IMC flashing. Besides, we found that the damping loops on MC1 wasn't enabled and we turned them ON to get a stable alignment.

WFS-B position shifted:

In order to have two WFSs afar from the beam waist by a Gouy phase 0f 45 degrees, WFS-B needed to be at 709.7 mm from the lens L3. According to Cheryl (alog 6521) WFS-B was at 679 mm and hence needed to come further by 30.7 mm to get the right Gupy phase. At first we double-checked Cheryl's optical path length measurement and our measurement agreed with hers. So we simply shifted WFS-B toward the north so as to increase the distance by 30.7 mm. I believe that the precision of these positions is about a few mm.

Kiwamu I, Ollie P, Michael R, Chris S

We were able to get the diode chiller back online with the new flow meter that arrived from technotrans. However, the flow was now over the threshold of 30 lpm. After talking with Ollie, we decided to increase the threshold to 32 lpm and the diode chiller was able to run continuously. The flow on the table measured by the uncalibrated channel H1:PSL-MIS_FLOW_OUTPUT was reading the same as before the chiller shut off, so it may be a calibration issue with the new flow meter.

While waiting for the new part to arrive, I thought it would be a good idea to work on the chiller hoses and connections. When the first chiller broke, I quickly set up the spare chiller with shorter hoses and plastic fittings thinking it would be a temporary fix. Today we were able to swap out the parts with longer hoses and stainless steel fittings (what it really should be) on both chillers. However, the crystal chiller shut off due to low flow through the amplifier and powermeters, and soon after the powermeter flow sensor went dead. Kiwamu and I went inside the H1 PSL to look at the manifold under the table, and managed to get the sensor back through some combination of hitting it to loosen particles, letting water flow through the return path into a bucket, and pulling apart the outer shell of the sensor. I really don't know how we got it to work, but it's working again, and we then were able to turn the laser on.

In order to clear the floor space underneath the cleanroom at the EX spool site (for eventual PCAL and CPB installs), I disconnected PEM components there.

The tiltmeter and Guralp seismometer were disconnected, cables labeled, and instruments stored temporarily on the EX termination slab.  They reside under their insulating styrofoam coolers.  Additionally, the busy mouse latrine that is the tiltmeter granite slab was cleaned with alcohol wipes.

Redoing the damped TFs on X1 with new damping filters and gains per LHO alog 6548.

* I created a symlink release->trunk in /opt/rtcds/userapps so that various other redirections could look the same on H1 vs. X1.

* I copy'n'pasted Jeff K's optimized damping filter definitions from H1:ITMY (where they had been installed by Arnaud), altering names as appropriate.

* I entered the gains from design_damping_QUAD_20130501.m and checked that I got stable damping.

* I used the save_safe_snap.m script to make a new /opt/rtcds/userapps/release/sus/x1/burtfiles/x1susquad_safe.snap and checked that it was linked to from /opt/rtcds/tst/x1/target/x1susquad/x1susquadepics/burt . I committed the new safe.snap.

DCS (LDAS) has started saving all the H1 raw full-frame data from the DAQ (CDS) filesystems to its archive filesystem,

 /archive/frames/HIFOY/L0/H1/

starting from 1053900000 GPS == May 29 2013 14:59:44 PDT == May 29 2013 21:59:44 UTC. We will continue to do this until HIFOY ends.

We also continue to save the minute-trends, second-trends, and PEM channels under:

/archive/frames/trend/minute-trend/H1/

/archive/frames/trend/second-trend/H1/

/archive/frames/A6/PEM_RDS/LHO/

All the above types of data are archived and available at LHO and CIT.

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.