 Wed May 12 13:06:15 2021, Ian MacMillan, Update, CDS, SUS simPlant model 
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Working with Chris, we decided that it is probably better to use a simple filter module as a controller before we make the model more complicated. I
will use the plant model that I have already made (see attachment
1 of this). then attach a single control filter module to that: as seen in attachment 1. |
 Wed May 12 14:23:20 2021, Jordan, Update, SUS, Mass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI units
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Wed May 12 16:53:59 2021, Koji, Update, SUS, Mass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI units
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No, this is the property of the suspension assembly. The mass says 10kg
Could you do the same for the testmass assembly (only the suspended part)? The units are good, but I expect that the values will be small. I
want to keep at least three significant digits. |
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Wed May 12 17:06:52 2021, Jordan, Update, SUS, Mass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI units
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Here are the mass properties for the only the test mass assembly (optic, 3" ring, and wire block). (Updated with g*mm^2)
Quote:
No, this is the property of the suspension assembly. The mass says 10kg |
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Thu May 13 11:55:04 2021, Anchal, Paco, Update, SUS, MC1 suspension misbehaving
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We came in the morning with the following scene on the zita monitor:
The MC1 watchdog was tripped and seemed like IMC struggled all night with misconfigured WFS offsets. After restoring the MC1 WD, clearing the |
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Thu May 13 19:38:54 2021, Anchal, Update, SUS, MC1 Satellite Amplifier Debugged
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[Anchal Koji]
Koji and I did a few tests with an OSEM emulator on the satellite amplifier box used for MC1 which is housed on 1X4. This sat box unit is S2100029 D1002812 that was recently characterized by me 15803. |
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Fri May 14 03:29:50 2021, Koji, Update, Electronics, HV Driver noise test with the new HV power supply from Matsusada
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I believe I did the identical test with the one in [40m ELOG 15786]. The + input of PA95
was shorted to the ground to exclude the noise from the bias input. The voltage noise at TP6 was measured with +/-300V supply by two HP6209 and two Matsusada
R4G360. |
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Fri May 14 17:45:05 2021, rana, Update, PSL, HEPA speed raised
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The PSL was too hot, so I turned on the south HEPA on the PSL. The north one was on and the south one was off (or so slow as to be inaudible and no vibration,
unlike the north one). Lets watch the trend over the weekend and see if the temperature comes down and if the PMC / WFS variations get less. Fri May 14
17:46:26 2021 |
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Sat May 15 12:39:54 2021, gautam, Update, PSL, NPRO tripped/switched off
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The NPRO has been off since ~1AM this morning it looks like. Is this intentional? Can I turn it back on (or at least try to)? The interlock signal we are
recording doesn't report getting tripped but I think this has been the case in the past too. |
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Sat May 15 14:54:24 2021, gautam, Update, SUS, IMC settings reverted
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I want to work on the IFO this weekend, so I reverted the IMC suspension settings just now to what I know work (until the new settings are shown quantitatively
to be superior). There isn't any instruction here on how to upload the new settings, so after my work, I will just restore from a burt-snapshot
from before I changed settings. |
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Tue May 18 00:52:38 2021, rana, Update, PSL, HEPA speed raised
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Looks like the fan lowered the temperature as expected. Need to get a few more days of data to see if its stabilized, or if that's just a fluke.
The vertical line at 00:00 UTC May 18 is about when I turned the fans up/on. |
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Tue May 18 20:26:11 2021, rana, Update, PSL, HEPA speed raised
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Fluke. Temp fluctuations are as usual, but the overall temperature is still lower. We ought to put some temperature sensors
at the X & Y ends to see what's happening there too. |
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Wed May 19 18:29:41 2021, Koji, Update, SUS, Mass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI units
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Calculation for the SOS POS/PIT/YAW resonant frequencies
- Nominal height gap between the CoM and the wire clamping point is 0.9mm (cf T970135)
- To have the similar res freq for the optic with the 3" metal sleeve is 1.0~1.1mm. |
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Thu May 20 10:35:57 2021, Anchal, Update, SUS, IMC settings reverted
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For future reference, the new settings can be upoaded from a script in the same directory. Run python /users/anchal/20210505_IMC_Tuned_SUS_with_Gains/uploadNewConfigIMC.py
from allegra.
Quote:
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Thu May 20 16:56:21 2021, Koji, Update, Electronics, Production version of the HV coil driver tested with KEPCO HV supplies
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HP HV power supply ( HP6209
) were returned to Downs |
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Fri May 21 00:05:45 2021, Koji, Update, SUS, New electronics: Sat Amp / Coil Drivers
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11 new Satellite Amps were picked up from Downs. 7 more are coming from there. I have one spare unit I made. 1 sat amp has already been used at MC1.
We had 8 HAM-A coil drivers delivered from the assembling company. We also have two coil drivers delivered from Downs (Anchal tested) |
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Fri May 21 00:15:33 2021, Koji, Update, Electronics, DC Power Strip delivered / stored 9x
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DC Power Strip Assemblies delivered and stored behind the Y arm tube (Attachment 1)
7x 18V Power Strip (Attachment 2)
7x 24V Power Strip (Attachment 2)
7x 18V/24V
Sequencer / 14x Mounting Panel (Attachment 3)
DC Power Cables 3ft, 6ft, 10ft (Attachments 4/5)
DC |
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Fri May 21 09:44:52 2021, Ian MacMillan, Update, CDS, SUS simPlant model
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The transfer function given in the previous post was slightly incorrect the units did not
make sense the new function is:
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Fri May 21 12:12:11 2021, Paco, Update, NoiseBudget, AUX PDH loop identification
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[Anchal, Paco]
We went into 40m to identify where XARM PDH loop control elements are. We didn't touch anything, but this is to note we went in there twice
at 10 AM and 11:10 AM. |
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Fri May 21 14:36:20 2021, Ian MacMillan, Update, CDS, SUS simPlant model
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The plant transfer function of the pendulum in the s domain is:
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Sun May 23 18:28:54 2021, Jon, Update, CDS, Opto-isolator for c1auxey
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The new HAM-A coil drivers have a single DB9 connector for all the binary inputs. This requires that the dewhitening switching signals from
the fast system be spliced with the coil enable signals from c1auxey. There is a common return for all the binary inputs. To avoid directly connecting
the grounds of the two systems, I have looked for a suitable opto-isolator for the c1auxey signals. |
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Mon May 24 08:38:26 2021, Chub, Update, Electronics, 18-bit AI, 16-bit AI and 16-bit AA
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- High priority units: 2x 18AI / 1x 16AI / 3x 16AA
All six are reworked and on the electronics workbench. The rest should be ready by the end of the week.
Chub |
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Mon May 24 10:19:54 2021, Paco, Update, General, Zita IOO strip
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Updated IOO.strip on Zita to show WFS2 pitch and yaw trends (C1:IOO-WFS2_PIY_OUT16 and
C1:IOO-WFS2_YAW_OUT16) and changed the colors slightly to have all pitch trends in the yellow/brown
band and all yaw trends in the pink/purple band. |
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Tue May 25 17:08:17 2021, Chub, Update, Electronics, chassis rework complete!
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| All remaining chasses have been reworked and placed on the floor along the west wall in Room 104. |
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Wed May 26 02:00:44 2021, gautam, Update, Electronics, Coil driver noise
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I was preparing a short write-up / test procedure for the custom HV coil driver, when I thought of something I can't resolve. I'm probably missing
some really basic physics here - but why do we not account
for the shot noise from DC current flowing through the series resistor? For a 4kohm resistor, the Johnson current noise is ~2pA/rtHz. |
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Thu May 27 14:11:15 2021, Jordan, Update, SUS, CoM to Clamping Point Measurement for 3" Adapter Ring
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The current vertical distance between the CoM and the wire clamping point on the 3" Ring assembly is 0.33mm. That is the CoM is .33 mm below the
clamping point of the wire. I took the clamping point to be the top edge of the wire clamp piece. see the below attachments.
I am now modifying the dumbell mechanism at the bottom of the ring to move the CoM to the target distance of 1.1mm. |
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Fri May 28 10:54:59 2021, Jon, Update, CDS, Opto-isolator for c1auxey
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I have received the opto-isolator needed to complete the new c1auxey system. I left it sitting on the electronics bench next to the Acromag chassis.
Here is the manufacturer's wiring manual. It should
be wired to the +15V chassis power and to the common return from the coil driver, following the instructions herein for NPN-style signals. Note that there |
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Fri May 28 11:16:21 2021, Jon, Update, CDS, Front-End Assembly and Testing
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An update on recent progress in the lab towards building and testing the new FEs.
1. Timing problems resolved / FE BIOS changes
The previously reported problem with the IOPs losing sync after a few minutes (16130) was
resolved through a change in BIOS settings. However, there are many required settings and it is not trivial to get these right, so I document the procedure here |
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Tue Jun 1 14:26:23 2021, Jordan, Update, SUS, CoM to Clamping Point Measurement for 3" Adapter Ring
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After changing the material of the Balance Mass from 6061 Al to 304 Steel, and changing the thickness to 0.21" from 0.25". The CoM is now 1.11mm
below the clamping point.
Koji expected a mass change of ~ 4g to move the mass to 1.1mm. The 6061 mass weighed ~1.31g and the 304 mass weighs 4.1g. |
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Tue Jun 1 16:17:06 2021, Yehonathan, Update, BHD, SOS assembly
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I tried to push the clean Viton tips into the vented screws just to find out that the vented holes are too small. We need to drill 0.1" diameter
holes about 0.1" deep into these screws and clean them again.
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Wed Jun 2 01:03:19 2021, Koji, Update, BHD, SOS assembly
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Can you just cut the viton tips smaller? If you cut it to have some wedge (or say, taper), it can get stuck with the vent hole.
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Wed Jun 2 01:08:57 2021, Koji, Update, SUS, CoM to Clamping Point Measurement for 3" Adapter Ring
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How about to use the non-Ag coated threaded shaft + the end SS masses with helicoils inserted? Does this save the masses to get stuck?
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Wed Jun 2 17:50:50 2021, Paco, Update, Equipment loan, Borrow red cart
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| I borrowed the little red cart 🛒 to help clear the path for new optical tables in B252 West Bridge. Will return once I am done with it. |
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Thu Jun 3 13:06:47 2021, Ian MacMillan, Update, CDS, SUS simPlant model
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I was able to measure the transfer function of the plant filter module from the channel X1:SUP-C1_SUS_SINGLE_PLANT_Plant_POS_Mod_EXC
to X1:SUP-C1_SUS_SINGLE_PLANT_Plant_POS_Mod_OUT. The resulting transfer function is shown below. I have also attached the raw data for
making the graph. |
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Thu Jun 3 17:15:17 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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As Jon wrote we need to use the NPN configuration (see attachments). I tested the isolator channels in the following way:
1. I connected +15V from the power supply to the input(+) contact.
2. Signal wire from one of the digital outputs was connected to I1-4 |
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Thu Jun 3 17:49:46 2021, Paco, Update, Equipment loan, Borrow red cart
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Returned today.
Quote:
I borrowed the little |
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Thu Jun 3 22:08:00 2021, Koji, Update, CDS, Opto-isolator for c1auxey
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- Could you explain what is the blue thing in Attachment 1?
- To check the validity of the signal chain, can you make a diagram summarizing the path from the fast BO - BO I/F - Acromag - This opto-isolator
- the coil driver relay? (Cut-and-paste of the existing schematics is fine) |
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Fri Jun 4 14:49:23 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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I made a diagram (Attached). I think it explains the blue thing in the previous post.
I don't know what is the grounding situation in the RTS so I put a ground in both the coil driver and the RTS. Hopefully, only one of them
is connected in reality. |
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Fri Jun 4 17:46:25 2021, unYehonathan, Update, CDS, Opto-isolator for c1auxey
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I mounted the optoisolator on the DIN rail and connected the 3 first channels
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Sun Jun 6 03:02:14 2021, Koji, Update, CDS, Opto-isolator for c1auxey
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This RTS also use the BO interface with an opto isolator. https://dcc.ligo.org/LIGO-D1002593
Could you also include the pull up/pull down situations? |
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Sun Jun 6 08:42:05 2021, Jon, Update, CDS, Front-End Assembly and Testing
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Here is an update and status report on the new BHD front-ends (FEs).
Timing
The changes to the FE BIOS settings documented in [16167] do seem
to have solved the timing issues. The RTS models ran for one week with no more timing failures. The IOP model on c1sus2 did die due to an unrelated "Channel |
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Sun Jun 6 12:15:16 2021, Jon, Update, CDS, Opto-isolator for c1auxey
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Since this Ocean Controls optoisolator has been shown to be compatible, I've gone ahead and ordered 10 more:
(1) to complete c1auxey
(2) for the upgrade of c1auxex
(7) for the upgrade of c1susaux
They are
expected to arrive by Wednesday. |
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Sun Jun 6 15:59:51 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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According to the BO interface circuit board https://dcc.ligo.org/D1001266, PCIN wires are connected to the
coil driver and they are not pulled either way.
That means that they're either grounded or floating. I updated the drawing. |
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Sun Jun 6 16:33:47 2021, Jon, Update, CDS, BI channels on c1auxey
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There
is still an open issue with the BI channels not read by EPICS. They can still be read by the Windows machine though.
I looked into the issue that Yehonathan reported with the BI channels. I found the problem was with |
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Mon Jun 7 13:14:20 2021, Yehonathan, Update, CDS, BI channels on c1auxey
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I added a new XT1111 Acromag module to the c1auxey chassis. I sanitized and configured it according to the slow
machines wiki instructions.
Since all the spare BIOs fit one DB37 connector I didn't add another feedthrough and combined them all on one and the same DB37 connector. |
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Mon Jun 7 17:49:19 2021, Ian MacMillan, Update, CDS, SUS simPlant model
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| Added difference to the graph. I included the code so that others could see what it looks like and use it for easy use. |
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Tue Jun 8 11:54:39 2021, Yehonathan, Update, CDS, BI channels on c1auxey
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I tested the digital inputs the following way: I connected a DB9 breakout to DB9M-5 and DB9M-6 where digital inputs are hosted. I shorted the channel
under test to GND to turn it on.
I observed the channels turn from Disabled to Enabled using caget when I shorted the channel to GND and from Enabled to Disabled when I disconnected |
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Wed Jun 9 13:50:48 2021, Ian MacMillan, Update, CDS, SUS simPlant model
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I have attached an updated transfer function graph with the residual easier to see. I thought here I would include a better explanation of what this
transfer function was measuring.
This transfer function was mainly about learning how to use DTT and Foton to make and measure transfer functions. Therefore it is just measuring |
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Mon Jun 14 15:31:30 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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I checked the BI situation on the HAM-A coil driver. It seems like these are sinking BIs and indeed
need to be isolated from the Acromag unit GND to avoid contamination.
The BIs will have to be isolated on a different isolator. Now, the wires coming from the field (red) are connected to the second isolator's |
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Mon Jun 14 18:57:49 2021, Anchal, Update, AUX, Xend is unbearably hot. Green laser is loosing lock in 10's of seconds
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Working in Xend with mask on has become unbearable. It is very hot there and I would really like if we fix this issue.
Today, the Xend Green laser was just unable to hold lock for longer than 10's of seconds. The longest I could see it hold lock was
for about 2 minutes. I couldn't find anything obviously wrong with it. Attached are noise spectrums of error and control points. The control point |