Good progress has been done this week at LHO. Jaimee installed a first version of the guardian main code ( /opt/rtcds/userapps/release/guardian/python), and I was able to use this code via the command line.

So far, 4 states are defined for the HAM-ISI:

- SAFE -> masterswitch off, watchdogs on

- READY -> all the filters and matrices are installed properly

- DAMPED -> Damping loops are on

- ISOLATED -> For now, the HIGHEST level of control is on

Work done this week:

- the folder infrastructure is defined

- ALL the transit scripts are working and seem robust (some work might need to be done on the DAMPED to ISOLATED transit to make it smarter)

- I wrote some basic recovery scripts for SAFE, READY and DAMPED (we might want to improve them later).

Everything is in the SVN at /opt/rtcds/userapps/release/isi/common/guardian/HAM/

Brett, Jeff, Hugo

Posting a measurement from last week. This data was collected at GPS time 1058659398 (23 July 2013, 5:03 pm PDT).

The data shows the coherence between all 6 ETMY ISIINF channels from 0.1 Hz to 10 Hz. The ISI was damped, with no isolation at this time. These are the witness channels of ISI STG2 in the SUS model that later get projected into the suspension point witness channels. The matrix of data can be read as the coherence from the channel name across the top of the figure to the channel name along the left side of the figure. Note that the data consists of a symmetric matrix, e.g. RX to Y is the same as Y to RX. 

The data shows the most off-diagonal coherence between X and RY, Y and RX. RZ also has some moderate coherence to everything except Z.

The Apollo welders have completed the move of BSC6 piping to BSC10.  The Pump Station in the Mechanical Room was also moved to provide better access to the back side of the station as we now have some extra room given that we only need one Pump Station.  The Pump Station is running in local recirculation mode servo controlled at 10 psi.  The middle recirc valve is choked down to give it some back pressure, please don't adjust.  The VEA side of the piping is under 100psi pressure to monitor for leaks.  If she passes, we'll start refilling the lines next week.
1/2 of the Pier Electronics hve been moved to BSC10; that will get finished Monday.

08:00
Laser Safe
Hugh and Apollo working on HEIP at End-Y

08:45 Cory G. to Mid-Y then going to End-X
10:07 Fire Department on site
10:10 Betsy & Travis working on ITM-X
11:35 Dale escorting a group through the LVEA
12:20 Richard M moved the dust monitor controller from under IMC tube to under H2-IMC
13:01 Thomas V End-Y to remove optical level equipment
13:19 Rick S working in the H1-PSL enclosure 
13:27 Fire Department back on site
15:32 Betsy & Travis at End-X

• Axial Position Error: +2.75 mm
  • Tolerance: ±3.0 mm
• Lateral Position Error: -0.5 mm
  • Tolerance: ±1.0 mm
• Vertical Position Error: +0.43 mm
  • Tolerance: ±1.0 mm
• Pitch Error: ~401 µrad down
  • Tolerance: ±50 µrad
• Yaw Error: ~4.969 mrad CCW
  • Tolerance: ±50 µrad

Moved the Dust Monitor Comtrol box from its position under the IMC Tube to the original location under the H2 IMC.  This is the start of the 485 loop.  The temporary position was in the middle and may have caused some transmission errors.
We will need to move the ethernet connection once more when the infrastructure is complete.

[K. Izumi, J. Kissel, J. Rollins]

We had a small victory today: the guardian interpreter (the robust guardian environment Jamie has created for python) is now functional, and we have successfully written a transit and recovery script to go from the ALIGNED to LOCKED state. In other words, we've converted the portions of the "mcup" and "mcdown" scripts (written in perl) which interact with the SUS MC2 into functional guardian transitions. Tomorrow, our goal is to get at least one of the MC suspensions managed by a guardian automaton.  The monitor/automaton is possibly working now, but we'll have to get it working and run it through its paces.

The IFO has been left in the following state (as of ~6:45 PDT): 

Suspended Cavities Locked: None.
Chamber    HEPI                                   ISI                               SUS
HAM1       Locked                                 n/a                               n/a
HAM2       Floating, Alignment Offsets Only       Level 2 Isolated                  MC1, MC3, PRM damped Level 1.5; PR3 damped Level 1.0
HAM3       Floating, Alignment Offsets Only       Level 2 Isolated (eLIGO Blends)   MC2, PR2 damped Level 1.5 
BS         Level 2 Isolated (Position Locked)     WD Tripped                        BS damped Level 2.0
ITMY       Locked                                 Level 2 Isolated                  ITMY damped Level 2.1
ETMY       Level 2 Isolated (Position Locked)     Level 2 Isolated                  ETMY damped Level 2.1, TMSY damped Level 2.0

The part with incomplete tapped holes (D1200310) was fixed by using a clean tap. We pulled the same parts for the third IFO and they were all fine.

The combined tele/table was suspended from the alignment bridge.

Fiber coupled green laser was set up to mimic the injection angle in the chamber.

We started steering the input green beam using the fiber launcher and the first steering mirror on the ISC table. Since everything was aligned previously, the only thing we needed to do was supposed to be to center the beam on the green QPDs.

However, when the green QPDs were almost perfectly centered, we've found that the beam path towards the ETM was totally off and the beam was not even clearing the hole in the ISC table.

Apparently something happened after the ISC table was set up on the work table, maybe one of the mirrors was bumped, or maybe something was loose and it moved when the ISC table impacted the telescope top for mating (actually, the first time we tried to mate the table was kind of wedged into the telescope was stuck, we needed to lift it to unstick, and when the table was freed one side of the table hit the tele top hard).

We need to realign everything on the table, which is not a huge deal but would add another day of work. Today we only realigned the green QPD path, tomorrow we move to the telescope path and IR path. This is actually a good opportunity to move the pico mirror by the periscope away from the suspension wire.

Randy Scott Tyler & Greg; Jim & Keith--Apollo Pipe Fitters

Almost everything is complete for the SEI transfer from BSC6 to BSC10:  All the Actuators are moved, all the plumbing is moved.  One pair of 4-way valves need to be secured to the hardlines.  A piping modification will be made in the mechanical room to give access to the back side of the pump station.  Once that is done, the system can be refilled with fluid for flushing & operation.  Pier electronics can be reinstalled on BSC10...that is about it.
A total of 15 liter of fluid has been removed so far, maybe a little more tomorrow with the MR mod.

Richard investigated the problem with the ETMX BIO reported in 7313 and got M0, R0 and L1 fixed, but not L2. I verified that actuation and damping now work for M0 and R0, but couldn't check L1 because the OSEMs there are still backed out.

To see whether it will be worth Doug and Jason's time to do alignment tomorrow or whether more mechanical adjustments are in order, I'm starting a round of undamped M0 and R0 TFs on ETMX from 4:10 pm.

Besides some discussions about OS, below there is a summury of activities:

- Y-arm road works (ask Ski for more details)
- End-Y works:
    Hugh
    Richard
- Rick gave to UTB students a LVEA tour
- Several DAQ restarts (ask Dave)
~ 11:30 Dale tour at the control room

Cheers

pablo

Noticed system pressure below min value when left drying tower regenerating -> Found fouled valve seat on left tower's 3/4" Y-pattern check valve -> Replaced "flapper" mechanism -> Reusing existing housing and "flapper" hinge pin

Phase 3b top mass (M1-M1) damped and undamped transfer functions on the beamsplitter under vaccum have been measured two days ago with the ISI floating, using the automated matlab script.

The attached pdf are showing in order the results for :

(1) Comparison between M1-M1 measured damped  (red) and modeled (blue) transfer function for the 6 DOF

(2) Comparison between M1-M1 measured undamped  (red) and modeled (blue) transfer function for the 6 DOF

(3) Comparison between M1-M1 phase 3a undamped (in air april 22nd 2013, orange curve), phase 3b undamped (in vacuum July 30th 2013, blue curve), phase 3b damped (in vacuum July 30th 2013, pink curve), and undamped modeled transfer function (in blue)

(4) Comparison between M1-M1 vertical DOF hanford beamsplitter phase 3b (in vacuum, July 30th 2013, orange curve), and livingston beamsplitter phase 3a (in air, April 16th 2013 black curve) and undamped modeled transfer function (in blue)

Most of measurements are in good agreement with the model. Although, the 1.70 Hz longitudinal mode cross coupling into the vertical degree of freedom, cf 3rd page of (1) and (2)

When looking at the comparison between phase 3a and phase 3b for the vertical DOF (3rd page of (3)), it appears that the cross coupling was not present in April when the suspension was in air.

Livingston beamsplitter seems to also have cross couplings in their vertical degree of freedom, but with roll and pitch mode instead of longitudinal (cf (4))

Due to a longstanding bug in a script (fixed on 6/28/13), there were a bunch of pdf files in ^/trunk/QUAD/Common/Data in the SUS SVN with names starting "allhstss...". I did svn mv commands on all of them to change the prefix to "allquads".

QDP80 roughing the vertex volume. For Mike Z.

Volume pumped would be the Y Beam Manifold + HAM2,3 + BSC1,2.