The NTP clients on the three Windows-based Ethercat computers has been set to use a server at 10.20.0.6, and the interval for checking shortened from one week to 1 hour after finding the clocks to be off by several seconds.
[Jim Arnaud]
This morning the quad iop and sus models of the staging building were restarted in preparation of future testing of QUAD09. The system would restart with wrong filters engaged (the 'norm' filters of the damping were on, whereas the input is not calibrated in um), so a new burt was saved with the good config.
Attached are some notes for testing QUAD09 in the staging building, as well as how to start the models
Jim, Dave
All systems (except h1psl0) were upgraded to RCG2.8.5 last week after the power outage. RCG2.8.5 has the bug fix which permits the IOP to disable the SUS DAC anti-imaging chassis via a keep-alive signal outputted from the 18bit DAC card.
Today we tested the control of the AI chassis using the ETMY/TMSY suspensions system via the IOP model h1iopsusey. Jeff K and Arnaud P gave us permission to use the EY suspension systems.
All the tests passed.
Here is what we did:
This concluded the test. The BYPASS on h1seiey was removed. Guardian put both ETMY and TMSY into the DAMPED state.
Maintenance: Reset HEPI overflow counters for HAM3, HAM4, ITMX, and BS.
Andres reported that the analog video feeds in the control room weren't working. The matrix switcher in the MSR was plugged in, but did not appear to have power. I unplugged it, waited a few seconds, and plugged it back in and it powered up. There was nothing that looked amiss with the power supply module or any of the boards accessible from the front of the chassis. It may have been a power glitch, or the power supply is getting flaky in it's old age. It appears to be a modular type under the cover, so it may be easy to replace if needed if it is still available commercially.
Crystal chiller has been refilled (added 250 ml of water to bring the level up to maximum)
J. Kissel, K. Venkateswara Because we continue to find the reference mirror signal -- a proxy for the autocollimator noise -- to be a useful signal to judge where the Beam Rotation Sensor's noise floor lies, we've output this channel out of the laptop's DAC, and piped it into the H1 ISI EX ADC on Channel ADC_0_29, and stored it in the science frames at 256 [Hz]. We expect the reference mirror to be stable, so we've not applied the very-low-frequency 1 [mHz] high-pass, but otherwise the calibration of the signal is identical to that of the beam balance mirror (see 13448): 3.5e-6 [rad/pixel] * 1 [pixels/V_sing] * 1/2 [V_sing / V_diff] * 40/2^16 [V_diff/ct] * 1e9 [nrad/rad] = 1.0681 [nrad/ct] This gain, called "cts2nrad" has been installed into FM1 of the H1:ISI-GND_BRS_ETMX_REF filter bank, as with the beam balance mirror. This required a recompile, reinstall, restart, and restore of the H1ISIETMX. We have not yet reboot the frame builder, so it remains with a 0x2000 status until the next DAQ restart at a more convenient time. I've committed the changes both the top-level h1isietmx.mdl model, and the H1ISIETMX.txt filter file to the userapps repo. We haven't yet added the filter bank to the BRS screen, but we'll get there.
WP 4790 - The default NDS server has been changed back to h1nds1 for the control room workstations. This affect new logins or new shells. Existing shells and programs should not be affected.
Attendees: Fred, Richard, Robert, Daniel, Keita, Patrick, Ed, John, Jodi, Jim, Jeff, Kori, Travis, Gerardo, etc Today's Tasks: • H1 EX BRS Installation/ More debugging and data analysis - Krishna • ETMY HEPI/Chamber system B-K Hammering work continues- Jeff K/T MacDonald • Cable work at corner station – Richard • 3IFO (Quad #9) assembly continues in Staging Building – Jeff B. • Staging Building/Setting up computer for Quad9 testing – Arnaud
Daniel, Jim, Dave
The status of the Beckhoff IOCs was missing from the control room. This was highlighted by their slow recovery following the power outage last week. As a first attempt to make them more visible, I have added their current time EPICS channels to the CDS STATE_WORD overview MEDMS (large and small versions). This immediately paid off, as we found the end station IOCs were not actually running, Daniel restarted them. We also noticed the OPI computers' times were off from each other by 2 seconds, so we need to NTP these machines today.
Hopefully better diagnostic channels, like UPTIME, can replace the current time on the overviews.
For the purposes of integrating Beckhoff "front ends" with the DAQ FE, I'm going to make a "GDS" screen per PLC which gives top level status info like STARTTIME, CODELIST, etc.
model restarts logged for Mon 18/Aug/2014
2014_08_18 10:20 h1fw1
2014_08_18 21:02 h1fw1
both restarts unexpected. First restart linked to firmware bug in sataboy, second restart not related to any other activities.
J. Kissel, T. MacDonald We've finally collected our "money" data set on ETMX HEPI/Chamber system -- and a quick look at the mode shape at 8 [Hz] reveals that this motion is the two crossbeams moving in concert along the beam direction (see ETMX_HPI_8Hz.avi). However, contrary to popular belief, this mode does *not* really involve the piers, the slab, or the chamber. Excited by the result (no pun intended), and having a measurement method and system nailed down, we packed up and high-tailed it to ETMY. We took the identical measurement there, and got the same exact mode shape (see ETMY_HPI_8Hz.avi). So it's systematic to the HPI/Crossbeam system, as has been indicated by the good Dr. Nuttall's work (see, e.g. G1400858). You'll notice that three data points on the cross-beam in the distance are exactly out of phase with everything else -- this is a measurement artifact: due to access issues (the chamber work platform is still set up at EY), so I had to hit that cross-beam from the opposite site (we're looking into whether we can somehow just invert the phase of those few data points with the B&K software). This settles the argument as to what I've moving at 8 [Hz] here at the sites! Now that we've got the result we want, and a whole lot more data to work with (we have modal information with 0.5 [Hz] resolution up to hundreds of [Hz]), we're going to use the one day two days that Tim has left to take finer resolution data on the horizontal cross beam / pier top / HPI boot system to nail down the exact mode shape so we can consider ways to *fix* it. (Again there's too much data to export at the moment, and this can easily be done offline -- which Tim will do back at Stanford, but stay tuned for more fun results!)
[Dan, Alexa, Koji]
We measured the beam geometry on HAM6 after the rotation of the septum window.
The new beam is actually going up by 1.9mrad, in stead of previous going down by 4.3mrad.
The beam height entering HAM6 is too low from the beginning, this upward angle gives us
the right height of the spot on OM1 in sub-milimeter presicion. In the horizontal projection,
The new beam is almost overwrapped with the designed path.
Attachment 1: Measured height of the beam on the HAM6 table.
Attachment 2: Summary of the beam geometry.
Behaves like predicted here for a 0.89º wedge. Go figure.
AS, KA, DH
As part of the HAM6 alignment work, we used OM1 to center the beam on OM2, and adjusted the OSEMs to the proper half-open-light values.
Thanks to the rotation of the septum window by Keita et al., the beam was well-centered on OM1 (see Koji's post on the new beam alignment in the chamber). We had to perform some not-so-gentle manipulations of the pitch adjustment screw at the bottom of the mirror holder to get the OM1 mirror to pitch enough forward that the beam was centered on OM2. In the end this required the use of an extra class-A nut to properly balance the mirror, and the removal of the tip-tilt's backplane (which holds the OSEMs) to allow us to access the mirror holder (and the screw hole) from the back. There were some tense moments of tip-tilt frustration, but in the end the screw+nut combination was just right for the pitch adjustment.
Once the beam to OM2 was aligned we checked the OMEM DC values and adjusted LL and LR to center the flags. The flag of the LL magnet is no longer touching the side of the OSEM (although it is close). The attached spectrum shows the OSEM signals for OM1; the mirror is free, the damping works, the beam is in the right place, we are happy.
In addition, we had temporarily aligned the transmission path from OM1 onto QPD ASC_AS_C so that we can use this as an alignment reference instead of having to deal with SR3 and SR2 centering. Today, we have to re-align this path and move the optics back to their original position since they had been shifted for the initial beam prior to the septum rotation. (note to myself: we need a burtrestore for this asc QPD).
J. Kissel, K. Venkateswara This morning I modified the laptop code to write two additional channels into aLIGO DAQ: One writes the tilt channel but with a lower gain such that it covers the entire range of the CCD. Obviously this doesn't reach the full sensitivity of the autocollimator but is useful as a diagnostic check on the DC position of the balance. The high-passed tilt channel doesn't give that information. The second channel, I added, writes the reference mirror position. I also noticed today that the Ion pump current was at 0.48 mA this morning, whereas it was about 0.38 mA on Saturday evening. It continued to rise to about 0.58 mA by today evening but appears to be leveling off. It may be an effect of 'saturation' of the pump. We will know by tomorrow, when we look at the trend. I also did a quick look at the data from the weekend and I've attached a couple of graphs. The first is from ~10k seconds on late Saturday night-early Sunday morning, when the ground was very quiet. There appears to be some excess noise in the BRS channel between 10 to 60 mHz, which is not tilt. Additionally, there are lines present at the harmonics of the beam resonance, due to small non-linearities in the read out. On Sunday night around 8:30 PM, there was an earthquake which shows up clearly in the T240 data, but is not visible in the BRS data. The second plot shows the ASD of 10k seconds during that period. This is preliminary and I'll do some better analysis soon.
(Koji, Dan, Alexa)
We first centered the beam on SR2 by adjusting SR3. We looked into HAM4 using the analog camera and we centered the beam around the aperature in front of SR2:
(SR3 original position: P 500 Y -150)
BOTTOM: P 513 Y -100
TOP: P 428 Y -100
RIGHT: P 464 Y -138
LEFT: P 464 Y -98
FINAL SR3: P 464 Y -118
Next, we adjusted SR2 to center the beam onto SRM/FI via the analog camera looking into HAM5:
BOTTOM: P 4154 Y 1770
TOP: P 599 Y 1770
LEFT: P 2376 Y 3420
RIGHT: P 2376 Y -100
FINAL SR2: P 2376, Y 1660
To fine tune SR2, we examined the beam in HAM6 and found the positions when the beam disppeared:
Dark in pitch:
P 2546, Y 1660
P 2006, Y 1660
Dark in Yaw:
P 2276, Y 2061
P 2276, Y 1482
FINAL SR2: P 2276, Y 1771
In this configuration we measured the power in HAM6 to be 2.6mW with ~1600mW at the PSL periscope PD.
If I take this power measurement at face value, I get an overall efficiency of 2.6/4.45 = 58%.
1600 mW * 0.0305 (PRM) * 0.5 (BS) * 0.986 (ITM) * 0.5 (BS) * 0.37 (SRM) = 4.45 mW
(John W, Daniel S, Keita K)
The viewport on the HAM5/6 septum was rotated by 120 degree clockwise. Torqued to 16 lbs.foot as per the spec. We didn't have to use a new O-ring as the old one was intact.
The photo of the septum window attached
