We don't seem to be ablke to use the lockloss tool tonight, I get this message. I'm not sure if this is realted to bug 834, or to some maintence activity today.
sheila.dwyer@opsws4:~/Desktop/Locklosses$ lockloss select
Kiwamu, Keita, Elli
Today locked aux laser to swept frequency offset to carrier laser using PLL. A network analyser provides a swept LO signal (7dBm into ZFM-4+ frequency mixer, or 10dBm if using a splitter.) The RF signal is the beatnote of carrier and aux laser frequencies, which is demodulated against the LO using a ZFM-4+ mixer and 1.9MHz low-pass filter. This error signal is sent to an LG1005 servo controller, P-I corner 10kHz, gain 4.1, LFGL 50dB. We amplified the RF sigal (1611 pd on IOT2R) using 17dB ZFL-1000+ RF amplifier, as the error signal of the PLL was very weak; this made locking the PLL easier. The PSL pwer was 2.3W, the aux laser power set to 500mW.
We noticed changing IM4 alignment during initial alignment changes alignment of beams onto the 1611 photodiodes enough that a quick realignment may be necessary. This is a little painful as this alignment is done on IOT2R, where the aux laser is. The aux laser frequency takes some time to settle after opening the table. Again today we used the 1611 pd on ISCT1. I unplugged the power to the bbpd-refl photodiode (the 3f refl pd) in order to power the 1611, and then changed this back again after I was done.
To take the measurement we locked DRMI 1f with ASC. To engage PRC1, we adjusted the centering offset on Refl-DC WFS. We looked at the signal reflected from DRMI using a 1611pd on ISCT1 on the reflair path, and measured the transfer function of this reflected light intensity over the LO frequency. Could see transmission dips every ~2.6MHz, which correspond to the auxiliary laser resonance in PRC. Also some other peak which may be higher order mode. Currently producing a model to make sense of this, and to decide what frequencies will be useful to measure at.
After the whitening chassis was swapped, the worst problem went away, i.e. QPDA seg2 looked healthy. However, smaller problem, i.e. the dark noise level of QPDA seg4 being about a factor of 2 or 3 higher than everybody else (attached top), persisted.
Disconnecting QPD cable from the transimpedance box did not change the behavior, but disconnecting the cable between the transimpedance box and the whitening chassis did.
Anyway, QPD transimpedance amps was also swapped and everything looks good (bottom).
Removed and replaced the annulus Ion Pump, aux pump cart will remain pumping on annulus system for some time.
As of this entry the current for this pump is at 3.02 mA.
Reset HAM5 and ITMY.
Added 15 channels. Removed 50 channels. 2 channels remain unmonitored: H1:SUS-SR2_LKIN_P_OSC_SW2R H1:SUS-SR2_LKIN_Y_OSC_SW2R
07:54 Elli to IOT2R 08:08 Jeff B. to LVEA to pull data out of humidity/temperature monitor in desiccant cabinet 08:14 Filiberto to end Y to swap whitening board for ISC 08:14 Karen to end Y to clean 08:36 Jeff B. back 08:56 Gerardo to LVEA to move pump cart in preparation for replacing annulus ion pump on BSC1 09:06 Karen and Filiberto leaving end Y 09:12 Jim B. finished updating GDS tools 09:30 Nutsinee to LVEA to find Elli 09:32 Kiwamu starting calibration of ETMX and ETMY optical levers 09:39 Keita checking swap of whitening board, misaligned ETMY 09:41 Nutsinee to LVEA to work on HWS table by HAM4 09:44 Gerardo out of LVEA 09:47 Dave restarted the guardian machine 09:49 Kyle to end Y to start bakeout of BSC6 RGA 09:55 Keita done on ETMY, to LVEA to talk to Elli 09:56 DAQ restart 10:00 Robert to LVEA to setup for PEM injections 10:01 Jim B. finished update of command line nds tool 10:23 Cris to end X 10:34 Kiwamu done optical lever calibration 10:40 Gerardo beginning replacement of BSC1 annulus ion pump 10:41 Nutsinee misaligned TMSY 10:58 Guardian restarted 11:18 Jim W. installing new ISI filters on ETMY 11:37 DAQ restart 11:47 Kiwamu calibrating PR3 optical lever 11:59 Kiwamu and Jason to LVEA to check whitening settings on PR3 optical lever 12:10 Cris back 12:23 Robert to end Y to set up for PEM injections 12:25 Kyle back from end Y 12:28 Kiwamu and Jason back 12:31 Kyle to LVEA to help Gerardo 12:49 TJ to end X to turn BRS damper on 12:59 Robert back 13:30 TJ back 13:37 Keita to end Y to look at transimpedence amplifier for QPDs 13:41 John to LVEA to look at platform Gerardo is using 14:02 Jeff K. to CDS electronics high bay 14:04 John and Kyle to end X mechanical room to change voltage on ion pump controller 14:05 Gerardo to LVEA 14:22 Gerardo back 14:42 John and Kyle back 15:08 Keita back from end Y 16:14 Elli, Keita and Kiwamu have locked DRMI and are taking a measurement by HAM1
To help with diagnosing the large cpu loading we were seeing on h1guardian0, at Jamie's request I have installed munin
on h1guardian0. It is currently running with the default configuration and reporting its output to the URL:
https://lhocds.ligo-wa.caltech.edu/exports/munin/h1guardian0/localdomain/localhost.localdomain/index.html
h1asc model has a modified filter file which has not been loaded. The change is to ASC_SRC1_P and ASC_SRC2_Y. At some convenient time in the future these chages should be loaded or removed.
h1iopasc0 infrequently shows a CPU max of > 15uS which I think is a new behaviour. It has happened twice in the past week.
Guardian is including TCS_ITMY in its channel lists (e.g. H1EDCU_GRD.ini) but this node is not running. This is causing the DAQ EDCU being purple.
HWS ETMY is missing an EPICS channel which does exist in ETMX. This is also causing the DAQ EDCU to be purple.
Aidan suggested that I align the irises to the sled beam rather than alinging the sled beam to the irises so I went in and redid the alignment for the ITMX HWS optics. I blocked the green light, centered the sled beam to the mirrors/lenses and adjusted the irises accordingly. Then I let the green light through, fine tuned the irises positions and made sure the green and the sled beam are reasonably well overlapped if not right on top of each other (SRC aligned, BS aligned, ITMX aligned, TMSX alinged, ETMY misaligned at this point). The green beam is hitting the HWS. However, the streamed imagees don't show any decent return sled beam. Given that the incoming green light overlaps the outgoing sled beam whatever is causing the return sled beam to be off is likely in vaccum. Greg also noticed the green beam coming down the ITMY periscope changed position significantly compare to last week. So we agreed to not adjust the corner station HWS optics any further until we are sure that the SRC optics won't change the alignment again. The Hartmann waveplate is off at the moment for ITMX.
John, Kyle Don't want pressure to vary as the result of varying IP12 voltage output -> Wider community using X2 BT pressure as indication of possible leaks being introduced from BT cleaning activities on X2 -> Fixed voltage at 7000V (same voltage as Y-end)
The pressure at X END has been bouncing around due to the programmed voltage steps of the main ion pump controller. In order to stabilize this we have set the voltage to 7 KV. This is also the same setting as the Y END pump.
The immediate response has been an increase in pressure to ~2e-8 torr. We expect the pressure to fall back to the low e-9 range as the pump sputters and exposes fresh surfaces.
During maintenance this morning we pushed a fairly minor guardian upgrade. We are now running:
Primary bugfixes or new features:
The last two are to help debug some of the intermittent issues we've been seeing with node processes hanging for unknown reasons.
The node status indicators on the main GUARD_OVERVIEW screen also now have a couple of extra indicators lights, for STALLED state of node, and if there are any SPM diffs:
Another new feature I forgot to mention is that guardian can now dump their internal setpoint table to a file.
This is triggered by writing a 1 ('True') to the SPM_SNAP channel for the node:
jameson.rollins@operator1:~ 0$ caput H1:GRD-SUS_ITMY_SPM_SNAP 1
Old : H1:GRD-SUS_ITMY_SPM_SNAP False
New : H1:GRD-SUS_ITMY_SPM_SNAP True
jameson.rollins@operator1:~ 0$ cat /ligo/cds/lho/h1/guardian/archive/SUS_ITMY/SUS_ITMY.spm
H1:SUS-ITMY_M0_TEST_P_SWSTAT IN,OT,DC
H1:SUS-ITMY_M0_TEST_Y_SWSTAT IN,OT,DC
H1:SUS-ITMY_R0_OPTICALIGN_Y_TRAMP 2.0
H1:SUS-ITMY_M0_OPTICALIGN_P_TRAMP 2.0
H1:SUS-ITMY_M0_TEST_P_TRAMP 2.0
H1:SUS-ITMY_M0_OPTICALIGN_Y_TRAMP 2.0
H1:SUS-ITMY_M0_TEST_Y_TRAMP 2.0
H1:SUS-ITMY_M0_OPTICALIGN_P_SWSTAT IN,OF,OT,DC
H1:SUS-ITMY_M0_OPTICALIGN_Y_SWSTAT IN,OF,OT,DC
H1:SUS-ITMY_R0_OPTICALIGN_P_TRAMP 2.0
jameson.rollins@operator1:~ 0$
A '.spm' file is written into the node archive directory (/ligo/cds/<site>/<ifo>/guardian/archive/<node>). The .spm file is a space-separated list of channel/setpoint pairs.
NOTE: the setpoints are accumulate over the running of the node. If the node has just been restarted (or the worker restarted after a STOP command has been issues) the setpoint table will be empty until the node passes through states where it actually writes to a channel. The full set of setpoints will only be fully known once the node runs through all system state code paths. Guardian has the ability to initialize the full set of setpoints for the node for a pre-defined set of channels, but we're not using that fascility yet.
The setpoint table is also written to the log when an SPM_SNAP is triggered, as is a full list of all PVs subscriptions currently active in the node:
2015-05-06T22:16:20.66686 SUS_ITMY W: PVs:
2015-05-06T22:16:20.66698 SUS_ITMY W: H1:SUS-ITMY_DACKILL_STATE = 1.0
2015-05-06T22:16:20.66705 SUS_ITMY W: H1:SUS-ITMY_L1_TEST_L_SW1R = 4.0
2015-05-06T22:16:20.66711 SUS_ITMY W: H1:SUS-ITMY_L1_TEST_P_SW1R = 4.0
2015-05-06T22:16:20.66717 SUS_ITMY W: H1:SUS-ITMY_L1_TEST_Y_SW1R = 4.0
2015-05-06T22:16:20.66723 SUS_ITMY W: H1:SUS-ITMY_L1_WDMON_STATE = 1.0
2015-05-06T22:16:20.66728 SUS_ITMY W: H1:SUS-ITMY_L2_TEST_L_SW1R = 4.0
2015-05-06T22:16:20.66734 SUS_ITMY W: H1:SUS-ITMY_L2_TEST_P_SW1R = 4.0
2015-05-06T22:16:20.66740 SUS_ITMY W: H1:SUS-ITMY_L2_TEST_Y_SW1R = 4.0
2015-05-06T22:16:20.66746 SUS_ITMY W: H1:SUS-ITMY_L2_WDMON_STATE = 1.0
2015-05-06T22:16:20.66751 SUS_ITMY W: H1:SUS-ITMY_L3_TEST_BIAS_SW1R = 4.0
2015-05-06T22:16:20.66757 SUS_ITMY W: H1:SUS-ITMY_L3_TEST_L_SW1R = 4.0
2015-05-06T22:16:20.66763 SUS_ITMY W: H1:SUS-ITMY_L3_TEST_P_SW1R = 4.0
2015-05-06T22:16:20.66768 SUS_ITMY W: H1:SUS-ITMY_L3_TEST_Y_SW1R = 4.0
2015-05-06T22:16:20.66775 SUS_ITMY W: H1:SUS-ITMY_M0_DAMP_L_SW2R = 1728.0
2015-05-06T22:16:20.66781 SUS_ITMY W: H1:SUS-ITMY_M0_DAMP_P_SW2R = 1728.0
2015-05-06T22:16:20.66787 SUS_ITMY W: H1:SUS-ITMY_M0_DAMP_R_SW2R = 1728.0
2015-05-06T22:16:20.66792 SUS_ITMY W: H1:SUS-ITMY_M0_DAMP_T_SW2R = 1728.0
2015-05-06T22:16:20.66798 SUS_ITMY W: H1:SUS-ITMY_M0_DAMP_V_SW2R = 1728.0
2015-05-06T22:16:20.66804 SUS_ITMY W: H1:SUS-ITMY_M0_DAMP_Y_SW2R = 1728.0
2015-05-06T22:16:20.66810 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_SW1 = 0.0
2015-05-06T22:16:20.66816 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_SW1R = 12.0
2015-05-06T22:16:20.66821 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_SW2 = 0.0
2015-05-06T22:16:20.66827 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_SW2R = 1536.0
2015-05-06T22:16:20.66833 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_SWSTAT = 302080.0
2015-05-06T22:16:20.66839 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_TRAMP = 2.0
2015-05-06T22:16:20.66845 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_SW1 = 0.0
2015-05-06T22:16:20.66850 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_SW1R = 12.0
2015-05-06T22:16:20.66858 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_SW2 = 0.0
2015-05-06T22:16:20.66870 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_SW2R = 1536.0
2015-05-06T22:16:20.66880 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_SWSTAT = 302080.0
2015-05-06T22:16:20.66891 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_TRAMP = 2.0
2015-05-06T22:16:20.66903 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_L_SW1R = 4.0
2015-05-06T22:16:20.66913 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_SW1 = 0.0
2015-05-06T22:16:20.66923 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_SW1R = 4.0
2015-05-06T22:16:20.66933 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_SW2 = 0.0
2015-05-06T22:16:20.66940 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_SW2R = 1536.0
2015-05-06T22:16:20.66948 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_SWSTAT = 300032.0
2015-05-06T22:16:20.66955 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_TRAMP = 2.0
2015-05-06T22:16:20.66962 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_R_SW1R = 4.0
2015-05-06T22:16:20.66969 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_T_SW1R = 4.0
2015-05-06T22:16:20.66976 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_V_SW1R = 4.0
2015-05-06T22:16:20.66983 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_SW1 = 0.0
2015-05-06T22:16:20.66995 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_SW1R = 4.0
2015-05-06T22:16:20.66998 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_SW2 = 0.0
2015-05-06T22:16:20.67005 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_SW2R = 1536.0
2015-05-06T22:16:20.67013 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_SWSTAT = 300032.0
2015-05-06T22:16:20.67023 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_TRAMP = 2.0
2015-05-06T22:16:20.67027 SUS_ITMY W: H1:SUS-ITMY_M0_WDMON_STATE = 1.0
2015-05-06T22:16:20.67037 SUS_ITMY W: H1:SUS-ITMY_MASTERSWITCH = 1
2015-05-06T22:16:20.67044 SUS_ITMY W: H1:SUS-ITMY_R0_DAMP_L_SW2R = 1728.0
2015-05-06T22:16:20.67048 SUS_ITMY W: H1:SUS-ITMY_R0_DAMP_P_SW2R = 1728.0
2015-05-06T22:16:20.67055 SUS_ITMY W: H1:SUS-ITMY_R0_DAMP_R_SW2R = 1728.0
2015-05-06T22:16:20.67062 SUS_ITMY W: H1:SUS-ITMY_R0_DAMP_T_SW2R = 1728.0
2015-05-06T22:16:20.67070 SUS_ITMY W: H1:SUS-ITMY_R0_DAMP_V_SW2R = 1728.0
2015-05-06T22:16:20.67077 SUS_ITMY W: H1:SUS-ITMY_R0_DAMP_Y_SW2R = 1728.0
2015-05-06T22:16:20.67088 SUS_ITMY W: H1:SUS-ITMY_R0_OPTICALIGN_P_SW1R = 12.0
2015-05-06T22:16:20.67172 SUS_ITMY W: H1:SUS-ITMY_R0_OPTICALIGN_P_TRAMP = 2.0
2015-05-06T22:16:20.67187 SUS_ITMY W: H1:SUS-ITMY_R0_OPTICALIGN_Y_SW1R = 12.0
2015-05-06T22:16:20.67198 SUS_ITMY W: H1:SUS-ITMY_R0_OPTICALIGN_Y_TRAMP = 2.0
2015-05-06T22:16:20.67210 SUS_ITMY W: H1:SUS-ITMY_R0_TEST_L_SW1R = 4.0
2015-05-06T22:16:20.67226 SUS_ITMY W: H1:SUS-ITMY_R0_TEST_P_SW1R = 4.0
2015-05-06T22:16:20.67229 SUS_ITMY W: H1:SUS-ITMY_R0_TEST_R_SW1R = 4.0
2015-05-06T22:16:20.67239 SUS_ITMY W: H1:SUS-ITMY_R0_TEST_T_SW1R = 4.0
2015-05-06T22:16:20.67250 SUS_ITMY W: H1:SUS-ITMY_R0_TEST_V_SW1R = 4.0
2015-05-06T22:16:20.67261 SUS_ITMY W: H1:SUS-ITMY_R0_TEST_Y_SW1R = 4.0
2015-05-06T22:16:20.67275 SUS_ITMY W: H1:SUS-ITMY_R0_WDMON_STATE = 1.0
2015-05-06T22:16:20.67287 SUS_ITMY W: SPMs:
2015-05-06T22:16:20.67316 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_SWSTAT = IN,OF,OT,DC
2015-05-06T22:16:20.67326 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_P_TRAMP = 2.0
2015-05-06T22:16:20.67353 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_SWSTAT = IN,OF,OT,DC
2015-05-06T22:16:20.67363 SUS_ITMY W: H1:SUS-ITMY_M0_OPTICALIGN_Y_TRAMP = 2.0
2015-05-06T22:16:20.67393 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_SWSTAT = IN,OT,DC
2015-05-06T22:16:20.67397 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_P_TRAMP = 2.0
2015-05-06T22:16:20.67424 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_SWSTAT = IN,OT,DC
2015-05-06T22:16:20.67432 SUS_ITMY W: H1:SUS-ITMY_M0_TEST_Y_TRAMP = 2.0
2015-05-06T22:16:20.67436 SUS_ITMY W: H1:SUS-ITMY_R0_OPTICALIGN_P_TRAMP = 2.0
2015-05-06T22:16:20.67446 SUS_ITMY W: H1:SUS-ITMY_R0_OPTICALIGN_Y_TRAMP = 2.0
2015-05-06T22:16:20.67455 SUS_ITMY W: 66 PVs, 10 SPMs
2015-05-06T22:16:20.67828 SUS_ITMY W: SPM snapshot: /ligo/cds/lho/h1/guardian/archive/SUS_ITMY/SUS_ITMY.spm
The BRS settled down to about +/-7000 counts, so I went down to the end station and turned the damper back on but I did not do the gravity dance with it. It should still take a bit for the damper to settle the BRS down to its nominal range so it is not yet usable.
Jason, Kiwamu,
PR3 oplev has not been properly behaving. We don't know when it ran into the issue. We will take a close look in the next maintenance Tuesday as we are suspecting a bad QPD and/or bad electronics.
[Cross-coupling issue]
Currently the symptoms are that:
At this point, we are not sure if this is due to a bad QPD segment or some kind of electrtonics issue.
[Dip switch confusion]
Independently of the cross-coupling issue, we found that a dip switch for the seg3 whitening filter had been set differently than the rest of three segments. We thought this would fix the cross coupling issue at the begginig, but switching it to the position that everyone else have been did not solve the issue because the cross-coupling behavior which is described above arose in turn. It is unclear how long the dip swtich has been in this configuration. Note that the last maintenance activity on PR3 was performed almost a month ago (on 7th of this April, alog 17722)
Changing WP #5182 -> had intended to bake out BSC6 RGA for 24 hours starting today but will bake in 4 hour increments over the next few maintenance days instead -> As such, pump cart at BSC6 will only run during maintenance periods.
On Saturday, I was able to get some data on the effect of different blend filters on DARM. It looks like we probably don't want to be using the 45mhz blends, or they need some re-working to reduce their low frequency performance. The attached plots are DARM from 2 lock stretches on Saturday. This is the CAL CS DELTAL spectra, which Jeff helped me calibrate, hopefully he'll explain in a comment. Blue traces are both end stations with 45mhz blends, orange traces are both end stations with 90 mhz blends, black is the ground. Ground was pretty similar between the 2 cases, range was similar, though slightly higher with the 90mhz blend, possibly better alignment? First plot is .01 hz to 3 hz, where most of the action is, the second plot is 1hz to 100hz.
The first plot shows the 90 mhz blend does as well as the 45mhz blend down to .3 hz, then does a factor of several worse until ~50mhz, where the gain peaking on the 45mhz blend causes more motion. Above 1 hz the 90mhz blend shows more RMS, I'm not sure of the cause, but there are features visible in the second plot at about 8-15hz that I don't understand. But they are probably not due to the blend change.
The method for calibrating the CAL-DELTAL_EXTERNAL_DQ DARM spectrum and getting it "right" around and below 10 [Hz]: (1) undo the 5 zeros at 1 [Hz], 5 poles at 100 [Hz] whitening DAQ filter LHO aLOG 16702 as one would normally do for this channel at all frequencies. (2) compensate for the digital UIM control filter (FM1 & 2, "int" and "lowboost", two poles at 0 [Hz], two zeros at 0.1 and 0.3 [Hz]) that we don't replicate in the CAL-CS actuation path because of numerical precision noise. (See LHo aLOG 17528) That means, in DTT, one has to apply the following calibration filter: Gain: 0.03 Poles: 1,1,1,1,1, 0, 0 Zeros: 100,100,100,100,100, 0.3, 0.1 where the gain of (exactly) 0.03 is to normalize the z:p = ([0.3 0.1] : [0 0]) filter necessary for getting the actuation at low frequencies correct in step (2) -- i.e. prod(2*pi*[0.3 0.1]) / (2*pi)^2 = 0.03 Why (2) works: Remember that DELTAL_EXTERNAL is the sum of the calibrated DARM_ERR and DARM_CTRL channels, DELTAL_EXTERNAL = (1 / C) * DARM_ERR + A * DARM_CTRL where C is the sensing function (i.e. the IFO's "test mass DARM displacement sensor" calibration) and A is the actuation function (i.e. the ETMY transfer function). A dominates this sum below the DARM UGF at ~40 [Hz]. As such, well below 40 [Hz], DELTAL_EXTERNAL ~ A * DARM_CTRL. Since we're using hierarchical feed back to ETMY, where the UIM/TST or L1/L3 cross-over frequency is ~1 [Hz], then well below *that*, DELTAL_EXTERNAL ~ A_{uim} * DARM_CTRL, i.e. the total calibration for DELTAL_EXTERNAL "well" below 1 [Hz] is dominated by how accurately we reproduce / calibrate / model the UIM actuation path. Since the UIM digital filters we've intentionally left out in CAL-CS have frequency content below ~0.5 [Hz], they're simply "missing" from the calibration of DELTAL_EXTERNAL, and we can, offline, just multiply all of DARM by these filters, and get the "right" answer. This being said, *all* calibration below 10 [Hz] still should be treated with some skepticism, because we have little-to-no precision measurements of the scale factor, DARM OLGTF frequency dependence, and/or TST/UIM cross-over frequency in this band (and we don't plan on making any). I could say it's "within a factor of two," because I think we've done everything right, but I have no measured proof to bound the uncertainty quantitatively. Above 10 [Hz], the latest estimate of precision and accuracy are described in detail in LHO aLOG 18186.
J. Kissel, D. Barker, B. Weaver After the first reboot of the guardian machine this morning, all SEI chambers except HAM3 came up as expected: the SEI manager and ISI / HPI subordinates are coded to be smart enough to figure out what state the platforms are actually in and restore to that state upon initialization. HAM3's ISI subordinate did not. I was able to identify it because the HAM3 SEI manager was complaining that it's subordinate's request had changed. The solution was to simply by-hand change the request to HIGH_ISOLATED. No big problem here, just want to start recording the outcomes of reboots so we can address any systematic issues. Note this did *not* happen on the second guardian machine reboot today.
This also happened for HEPI HAM1, at least after the second reboot. BUT this may be because he's unique in that it doesn't have a SEI chamber manager telling him where to go, not because of any errant code. I've manually moved the requested state to ROBUST_ISOLATED, which is where the platform was already.
These are two totally different issues. The HPI_HAM1 issue is just because it doesn't have an initial request state defined. I think Hugh has now fixed that.
This was the result of the guardian log time stamp change, which slightly changed the format of the time stamps in the logs.
It should be fixed now.
thanks