HugoP, JimW

After finishing up floating and balancing the ISI this morning (Stage 2 was floated on Friday, Stage 1 required minimal adjusting this morning), we started testing the ISI in the afternoon. First we built and installed a recently updated BSC model, then populated the MEDM, then used a somewhat shady epics variable short cut (exclusive to the ISI test stand) to de-activate the SUS watchdog (the quad is on stops, so the watchdog is not doing anything right now, anyway). After all that, we were able to start driving, first the actuator static local basis test to verify the actuators behaving properly, and now an overnight transfer function. Should finish by the morning meeting.

With Patrick and Filiberto's help, the EX Beckhoff system is now running.  The Twincat System Manager sees all EX components, and keepalive signals are propagating down the fiber link from the corner to EX and vice versa.  Here's the documentation we followed to get the fiber links working: http://infosys.beckhoff.com/english.php?content=../content/1040/el6692/html/bt_el6692_functionality.htm

MEDM screens went live after we started Maggie's EPICS server, using the command C:\SlowControls\EPICS\Utilities\Bin\start_h1x1.bat

Cabling out to the electronics in the VEA still has to be set up and tested.

[Hugo Jeff Arnaud]

Now that one of the satellite box of ITMY (see 7780) has been changed, and following Jeff's and Vincent's investigation on the 6.18Hz noise injected from sus to sei (see 7720 7709 and 7609 for details), a spectra of GS13 on stage 2 of ISI has been taken (using Vincent's scripts), as well as a spectra of the left and right osems before and after changing the sat amp, with the ISI isolated level 3, and the suspension with all the damping loops closed. The pdf attached are described below :

(1) Light blue is GS13 from Sept 10th before the sat amp was changed, and the 6.18Hz peak is present. Dark blue from Sept 30th, and we don't see the peak anymore. Pink and Violet are showing ground motion.

(2) Dashed curves are left and right osems from September 10th before the sat amp was changed, the 6.18Hz peak is present. Plain blue and red are from September 27th, after the sat amp was changer, the peak is a lot reduced.

From those plots, it looks that changing the satellite box reduced the peak by a large amount.

We would need to get the ISI to the requirements, as shown on dark blue of first pdf, and do the same measurement, in order to conclude that it entirely fixed the problem.

Joe Gleason, Pablo Daveloza, Keita Kawabe

We attempted to balance the RM2 Tip Tilt optic by shifting the wire clamp mounting block in the optic holder but were unable to do so at the limit of its range.

We elected to install the optic in a new suspension assembly from the set for HAM6. The new assembly also required a large change to the wire clamp positions but we were successful in getting it balanced. We performed the remaining setup on the assembly and bagged/stored the assembly in the temporary clean room outside HAM2.

SEI -- JimW MitchellR & Hugh
We figured we could tolerate a few errant pounds for this initial floating.  All the pre-install weight is on and while the ISI likely won't balance at the moment, it should be really close for the HEPI payload.
So BSC9 ETMx HEPI is unlocked and we leveled the Optical Table pretty well (ISI is still locked).  So I believe SUS and TMS can shed their extra loads now.  We may want to keep the glass locked until the ISI is unlocked and balanced.  Also, some initial IAS work can possibly go forward now.

Shift started out with a windy morning and the Control Room in a post-power outage glitch state.  Here are today's activities:

• Recover from Power Outage.  Back to normal around 11:15am (Jim & Dave)
• Sheila restored PSL from the Outage
• LVEA transitioned to Laser SAFE to install/swap HAM1 Feedthrus (went back to HAZARD in afternoon)
• Cabling/fiber work at EX (Filiberto/Cyrus)
• Arm Cavity Baffle work continues (Thomas)
• SEI crew working on the BSC9 ISI (Jim & Hugh?)
• Ken drilling on pedestals on Y-Beam Manifold for cable trays
• Patrick did work with PSL & Dust monitors
• HAM6 cabling/grounding work (Elec crew)

I ended up power cycling the PSL environmental chassis and rebooting h1ecatc1. I was testing code for the rotation stage and had put things in a bad state. It should be recovered.

Restarted IOP models for the triple test stand and the bsc test stand in the staging building after power failure.  Made sure that DAQ was running on each.

ITMY-ISI controls were turned back ON for the 6.18Hz peak investigation.

Stage 1-2:

- Level 3 Isolation Loops
- T750mHz blend on RX, RY and RZ  (750mHz blend that includes the T240s)
- T100mHz_NO.44 on X, Y and Z         (100mHz blend including Trilliums, with notch)

Stage 0-1 feedforward is ON.

After Dave restarted the front ends, hepi itmy matrix values were empty. I restored them as they were friday morning, turned the master switch and all the loops off, and saved a new safe snapshot from that config.

A soft link from /opt/rtcds/lho/h1/target/h1hpiitmy/h1hpiitmyepics/burt/safe.snap -> /opt/rtcds/userapps/release/hpi/h1/burtfiles/h1hpiitmy_safe.snap has been created

h1hpiitmy_safe.snap has been commited to the svn

sw-msr-h1fe decided to reboot itself today at 10:45AM, the cause is unknown but most likely related to the power problems earlier in the morning.  When I went looking for syslogs for possible clues, I realized that none of the Netgear switches had remote sysloging enabled, so I took the time to make that configuration change on all the switches, as well as the Fujitsu DAQ broadcast switch.  The installed Cisco switches and APs already had syslog logging enabled.  There is no guarantee that having syslog messages will give any indication of what caused a problem (in this case reboot), but it provides more information than none at all...

Due to a pair of power failures, the DAQ test stand needed to be restarted.  All front end computers were rebooted.  The x1ldasgw computer was locked up and was rebooted.  The DAQ computers which mount the SATAboy disk array were also rebooted once the x1ldasgw was operational in order to get the file system mounted and the daqd processes running.  Finished about 11:45 PDT.

(David Barker, Cyrus Reed, James Batch)

LHO experienced a 2 second power fail at 00:40:43 PDT and a power glitch at 06:06 PDT which caused front end reboots.  Also affected were both CDS file servers.

The main file server entered a read-only state, while the backup file server locked up and was unresponsive.  Both file servers were restored by 08:30 PDT.

All front-end computers were powered off, as several were not logically attached to their I/O chassis.  On power up, the following computers still could not find the I/O chassis:

h1seib1
h1seih45
h1sush2b
h1susquadtst
h1susex
h1susexaux

In each case, turning the power switch on the front of the I/O chassis from on to off to on caused the I/O chassis to power up.  The computers were then power cycled to get the I/O chassis reattached.

At this point, there were IPC problems in which channels could not be received from the following computers:

h1lsc0
h1asc0
h1seih23
h1seih16
h1seib2

In order to correct this problem, the Dolphin switches in the MSR needed to be power cycled, which in turn required all computers in the MSR that were attached to the Dolphin network to be power cycled.  Once this was accomplished, and a few models manually restarted, all appears to be well.  The system is back in operation as of 11:30 PDT.

after the power glitch the PSL had to be restarted.  Justin and I followed the procedure to start it in low power mode, we reset the kepco HV supply to 200mA, as Christina wrote in her alog instead of the 400mA in the procedure.  We also reset the LRA, even though we were starting it in low power mode I wasn't sure if the beckhoff computer had lost power or not.  

The only hitch was that we couldn't open the external shutter, the situation was similar to  last time , 
H1:PSL-MIS_FLOW_OK was 0, although H1:PSL-MIS_FLOW_INMON was within the limits.  We tried the reset button on the medm screen, which didn't do anything, and we tried caput which also didn't change the value.  Jim and Dave managed to open it, they will write a log about what they did.  

The PMC is now locked, but the medm screen reports -30W transmitted power.  H1:PSL-PWR_PMC_TRANS_GAIN is now -0.024, while it was 1 before the power glitch.  

The ISS is not staying locked, which was also the case before the power glitch.  

These needed to be restarted after an apparent power glitch from a wind storm.

[JoeG, Keita and Kiwamu]

We continued working on the HAM1 installation this afternoon.  All the optics except for the detectors are now on the table including the newly installed QPD sled. We removed the counter weights although didn't check the table level yet.

Besides, there are two (unhonourable) highlights to mention from today's HAM1 incursion.

1. The mirror of a tip-tilt (RM1) was found to be backward. So we flipped it to the right direction in situ.
2. The other tip-tilt (RM2) started showing a too big pitching

A big pitching in a tip-tilt (RM2):

After the removal of the counter weights we went through the alignment process again in the in-vac detector path. The alignment needed a slight touch mainly in pitch. Then we found that RM2, which is a tip-tilt , showed a large pitching so that the reflected beam went too low. Joe tried to correct it by screwing the bottom 8-32 screw further in. This screw is designed such that as we screw it in, the center of its mass changes the pitching of the whole holder (so as to lower reflected beam). We wanted screw it in further but however the screw was too long and in fact it was already touching the back cage. Keita brought a shorter screw which is 8-32 x 1" and we tried this. However sadly it still hit the back cage because of too large pitching. Joe translated the upper blades to the front to separate the back cage and holder further apart, but this didn't fix the issue. Note the mirror holder was picthing in the same direction even without the screw.

According to our inspection, the clamping point of the wire on the left wire clamp (when looking from the front) on the mirror holder is too close to the back side. Probably about 1 mm off from the center toward the back side. The other side looked also close to the back side but not as big as the left side. At the moment we think this gives such pitching in the mirror holder. Pictures of the clamping point for both left and right sides are attached below. You can see how they are clamped through a rectangular window of the side cage. We have no idea of if it has been like this or when and why this happened. Adjusting the clamping point is certainly beyond what we can do in the chamber because it probably involves with all the alignment and adjustment process. Therefore we removed the tip-tilt our of the chamber. It is now in the clean booth nearby HAM1.

Plan :

 Next week we will bring another tip-tilt which was assembled for HAM6 and swap the bad one with it. Hopefully we can smoothly place the tip-tilt and move on to some measurements for checking the mode matching.

[Pablo and Kiwamu]

 We have measured the reflectivity of another 2" P-polarizing beam splitter (E040512-B3 SN: I0822-07) for S-polarization this morning at the OSB optics lab.
The results are :
    HR reflectivity R = 92.5 % for S-pol @ 1064 nm, 45 deg
    AR reflectivity R =  2.8 % for S-pol @ 1064 nm, 45 deg

Background :

Even though we already installed a 90% S-polarizing beam splitter on HAM1, we still thinks that this 90% might not be big enough to attenuate the reflection beam to avoid damaging the detectors. One way to increase the safety margin is to simple replace this 90% BS by one with a higher reflectivity. Because we have 90% P-pol BS in hand we simply wanted to try measuring the reflectivity with a S-polarizing beam.

Setup:

Same as the previous measurement (see alog #7817).