Starting ETMX spectra at 4:25 pm to check health of suspension after Betsy and Travis made some adjustments.
I have used colors to indicate the importance of various bits of the front end STATE_WORD on the CDS overview MEDM. Initially all bits had equal weight. In the new scheme the priority is (from lowest to highest)
OVERFLOW: blue
EXCITATION: purple
WD (no active suspension): YELLOW
active WD and all other bits (timing, running, awg, daq): RED
I will maintain which WD bits should be RED or YELLOW, currently only IMC systems are RED.
Currently, the FSS is not locking. Auto-locking script disabled.
I set the "gaurdian" to manual and disabled the input to the MC servo, so the MC shouldn't be bothering the ref cav any more. The FSS is still only locking for a minute at a time
Have completed HEPI Pier Electronics install; just waiting for EE cabling. I understand this is many weeks away. On the Pump Station reservoir, hardware and components were swapped for more corrosion resistant styles. As for the moved tubing, still under pressure. Lost maybe a psi over the weekend, likely in the noise. If still holding Tuesday, we'll start refilling the piping for system restart & bleeding.
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
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.
A note on Siskiyou actuators:
When you tighten the lock screw of the Siskiyou actuators, the mirror angle changes considerably. When we were doing this for the mirror holder in front of the green QPD sled, the beam fell off of the second QPD. The QPD sled is designed such that the second QPD monitor far field, which means that the beam displacement on that QPD caused by the angle change is much much larger than the angle change multiplied by the lever arm, but that doesn't make me less annoyed.
I don't understand why this happens, but this is quite repeatable and it's not only one mirror holder either, we also experienced this with telescope alignement.
This makes it extremely difficult to work with these actuators (if you want to lock them), because after you tighten the lock screw, the actuator screw becomes hard to move and you cannot get the mirror back to where it should be.
My work around was not to overly tighten, just make it such that it's not easy to move the actuator by hand but it's still possible to do it using an Allen key, and only use Allen keys to make adjustment. Yes it's against the idea of locking if I'm only sort-of-but-not-really locking.
If tightening the lock screw makes such a big change in the mirror angle, I have to wonder if it drifts with the temperature change. Actuator screw is stainless steel, the threaded thing for the actuator screw seems like bronze, thermal expansion coefficients are different depending on the composition of alloy (quick googling tells me that 304SS is about 17E-6/K, 310SS about 14E-6/K, bronze about 19E-6). Therefore when the temperature changes the actuator might become tighter or looser just like when you tension the lock screw.
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.
The measurements had completed successfully when checked at 08:30:
M0: ^/trunk/QUAD/H1/ETMX/SAGM0/Data/2013-08-01-1059433785_H1SUSETMX_M0_0p01to50Hz_tf.mat
R0: ^/trunk/QUAD/H1/ETMX/SAGR0/Data/2013-08-01-1059452258_H1SUSETMX_R0_0p01to50Hz_tf.mat
For M0 there are a few small L/P peaks in Y in M0 and the fundamental pitch mode is a touch low, but otherwise everything is pristine.
R0 has the usual issue where the pitch mode is higher than in the model due to the stiffness of the cables but otherwise looks good.
The Y issue in M0 is similar to past cases of misaligned OSEMs rather than touching, so the suspension is OK to do alignment on.
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
QDP80 roughing the vertex volume. For Mike Z.
Volume pumped would be the Y Beam Manifold + HAM2,3 + BSC1,2.
Volume pumped should be Y Beam Manifold + HAM2,3 + BSC 1,2,3
Damping Off: 1059780891
Damping On: 1059780354
The summary plots have data for L1ITMX (blue), L1ETMX (green), and H1ETMX of 7/31 (red) and today (8/5). Since 7/31, the L1 and L2 OSEMs have been adjusted so the data for them is now valid. Nothing looks to be touching.