 Tue Nov 6 19:41:46 2018, Jon, Omnistructure, , c1vac1/2 replacement
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This afternoon I started setting up the Supermicro 5017A-EP that will replace c1vac1/2. Following Johannes's procedure in 13681 I
installed Debian 8.11 (jessie). There is a more recent stable release, 9.5, now available since the first acromag machine was assembled, but I stuck to
version 8 for consistency. We already know that version to work. The setup is sitting on the left side of the electronics bench for now. |
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Wed Nov 7 19:17:18 2018, Jon, Omnistructure, , modbusIOC is running on c1vac replacement
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Today I finished setting up the server that will replace the c1vac1/2 machines. I put it on the martian network at the unassigned IP 192.168.113.72.
I assigned it the hostname c1vac and added it to the DNS lookup tables on chiara.
I created a new targets directory on the network drive for the new machine: /cvs/cds/caltech/target/c1vac. After setting |
Fri Nov 9 22:24:22 2018, Jon, Omnistructure, , Wiring of Vacuum Acromag Chassis Complete 
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Wiring of the power, Ethernet, and indicator lights for the vacuum Acromag chassis is complete. Even though this crate will only use +24V DC, I wired
the +/-15V connector and indicator lights as well to conform to the LIGO standard. There was no wiring diagram available, so I had to reverse-engineer
the wiring from the partially complete c1susaux crate. Attached is a diagram for future use. The crate is ready to begin software developing on Monday. |
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Wed Nov 14 21:34:44 2018, Jon, Omnistructure, , Vacuum Acromags installed and tested
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All 7 Acromag units are now installed in the vacuum chassis. They are connected to 24V DC power and Ethernet.
I have merged and migrated the two EPICS databases from c1vac1 and c1vac2 onto the new machine, with appropriate modifications to address
the Acromags rather than VME crate. |
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Mon Nov 19 22:45:23 2018, Jon, Omnistructure, , Vacuum System Subnetwork
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I've set up a closed subnetwork for interfacing the vacuum hardware (Acromags and serial devices) with the new controls machine (c1vac; 192.168.113.72).
The controls machine has two Ethernet interfaces, one which faces outward into the martian network and another which faces the internal subnetwork, 192.168.114.xxx.
The second network interface was configured via the following procedure. |
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Mon Nov 19 23:38:41 2018, Jon, Omnistructure, , Vacuum Acromag Channel Assignments
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I've completed bench testing of all seven vacuum Acromags installed in a custom rackmount chassis. The system contains five XT1111 modules (sinking
digital I/O) used for readbacks of the state of the valves, TP1, CP1, and the RPs. It also contains two XT1121 modules (sourcing digital I/O) used to pass
24V DC control signals to the AC relays actuating the valves and RPs. The list of Acromag channel assignments is attached. |
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Sun Nov 25 17:41:43 2018, Jon, Omnistructure, , Vacuum Controls Upgrade - Status and Plans
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New hardware has been installed in the vacuum controls rack. It is shown in the below post-install photo.
Supermicro server (c1vac) which will be replacing c1vac1 and c1vac2.
16-port Ethernet switch providing a closed local network
for all vacuum devices.
16-port IOLAN terminal server for multiplexing/Ethernetizing all RS-232 serial devices.
Below is a |
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Mon Nov 26 21:58:08 2018, Jon, Omnistructure, , Serial Vacuum Signals
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All the serial vacuum signals are now interfaced to the new digital controls system. A set of persistent Python scripts will query each device at regular
intervals (up to ~10 Hz) and push the readings to soft channels hosted by the modbus IOC. Similar scripts will push on/off state commands to the serial
turbo pumps. |
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Tue Jan 29 16:12:21 2019, Chub, Update, ,
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The foam in the cable tray wall passage had been falling on the floor in little bite-sized pieces, so I investigated and found a fiber cable that had
be chewed/clawed through. I didn't find any droppings anywhere in the 40m, but I decided to bait an un-set trap and see if we'd find activity
around it. There has been none so far. If there is still none tomorrow, I will move the trap and keep looking for signs of rodentia. At the |
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Tue Feb 5 10:22:03 2019, chub, Update, , oil added to RP-1 & 3
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I added lubricating oil to roughing pumps RP1 and RP3 yesterday and this morning. Also, I found a nearly full 5 gallon jug of grade 19 oil in the
lab. This should set us up for quite a while. If you need to add oil the the roughing pumps, use the oil in the quart bottle in the flammables
cabinet. It is labeled as Leybold HE-175 Vacuum Pump Oil. This bottle is small enough to fill the pumps in close quarters. |
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Wed Feb 6 10:07:23 2019, Chub, Update, , pre-construction inspection
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The Central Plant building will be undergoing seismic upgrades in the near future. The adjoining north wall along the Y arm will be the first to
have this work done, from inside the Central Plant. Project manager Eugene Kim has explained the work to me and also noted our concerns. He
assured me that the seismic noise from the construction will be minimized and we will always be contacted when the heaviest construction is to be done. |
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Fri Mar 8 08:40:26 2019, Anjali, Configuration, , Frequency stabilization of 1 micron source
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The schematic of the homodyne configuration is shown below.
Following are the list of components
Item
Quantity
Availability
Part |
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Sat May 18 12:19:36 2019, Kruthi, Update, , CCD calibration and telescope design 6x
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I went through all the elog entries related to CCD calibration. I was wondering if we can use Spectralon diffuse reflectance standards
(https://www.labsphere.com/labsphere-products-solutions/materials-coatings-2/targets-standards/diffuse-reflectance-standards/diffuse-reflectance-standards/)
instead of a white paper as they would be a better approximation to a Lambertian scatterer. |
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Mon May 20 21:45:20 2019, Milind, Update, , Traditional cv for beam spot motion
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Went through all of Pooja's elog posts, her report and am currently cleaning up her code and working on setting up the simulations of spot motion
from her work last year. I've also just begun to look at some material sent by Gautam on resonators.
This week, I plan to do the following: |
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Fri Jul 19 22:48:08 2019, Kruthi, Update, , Dataviewer error
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I'm not able to get trends of the TM adjustment test that Rana had asked us to perform, from the dataviewer. It's throwing the
following error:
Connecting to NDS Server fb (TCP port 8088) |
 Sat Jul 20 01:03:37 2019, gautam, Update, , Dataviewer error
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What channels are you trying to read?
Quote:
I'm not able to get trends of the TM adjustment test that Rana had asked us to perform, from |
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Tue Sep 10 16:10:40 2019, Chub, Update, , Rack Update
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Still removing old cable, terminal blocks and hardware. Once new strain reliefs and cable guides are in place, I will need to disconnect cables
and reroute them. Please let me know dates and times when that is not going to interrupt your work! |
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Wed Feb 26 17:17:17 2020, Yehonathan, Update, , Arms DC loss measurements 6x
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{Yehonathan, Gautam}
In order to measure the loss in the arm cavities in reflection, we use the DC method described in T1700117.
It was not trivial to find free channels on the LSC rack. The least intrusive way we found was to disconnect the ALS signals DSUB9 (Attachment |
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Thu Dec 10 17:12:43 2020, Jon, Update, , New SMA cables on order
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As requested, I placed an order for an assortment of new RF cables: SMA male-male, RG405.
x3 12"
x3 24"
x2 48"
They're expected to arrive mid next week. |
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Sat Dec 19 00:25:20 2020, Jon, Update, , New SMA cables on order
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I re-ordered the below cables, this time going with flexible, double-shielded RG316-DS.
Jordan will pick up and return the RG-405 cables after the holidays.
Quote:
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Sat Dec 19 02:42:56 2020, Koji, Update, , New SMA cables on order
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Our favorite (flexible) RF cable is Belden's 1671J (Jacketed solder-soaked coax cable). It is compatible RG405. I'm not sure if there is off-the-shelf
SMA cables with 1671J.
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Thu Sep 2 19:28:02 2021, Koji, Update, , This week's FB1 GPS Timing Issue Solved
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After the disk system trouble, we could not make the RTS running at the nominal state. A part of the troubleshoot FB1 was rebooted. But the we found
that the GPS time was a year off from the current time
controls@fb1:/diskless/root/etc 0$ cat /proc/gps |
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Thu Sep 16 14:08:14 2021, Ian MacMillan, Frogs, , Tour
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| I gave some of the data analysts a look around because they asked and nothing was currently going on in the 40m. Nothing was changed. |
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Mon Apr 25 18:00:03 2022, Ian MacMillan, Update, , Cable supports update
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I have designed new cable supports for the new ribbon cables running up the side of the tables in the vacuum chambers. This is a ribbon cable
version of the existing cable clamp cf D010120
The clamps that I have designed (shown in basic sketch attachment 1) will secure the cable at each of the currently used cable supports. |
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Wed Jan 25 10:02:47 2023, yehonathan, Update, , Earthquake, MC3 watchdog tripped
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We came this morning and noticed the FSS_FAST channel was moving very rapidly. Short inspection showed that MC3 watchdog got tripped. After reenabling
the watchdog the issue was fixed and the MC is stable again.
There is a spike in the seismometers 8 hours ago and it was probably due to the 4.2 magnitude earthquake that happened in Malibu beach around |
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Fri May 19 09:23:58 2023, Paco, Update, , MCF Noise
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The fan behind the PSL controller is injecting excess band limited noise
Background |
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Tue Jun 13 14:12:34 2023, Mayank, Configuration, , Restarted the NDS2 script on Megatron
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[Radhika, Mayank]
Restarted the NDS2 script on Megatron following the instructions here
Steps |
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Fri Jun 16 23:09:31 2023, Mayank, Update, , IFO working after ETMX electronics upgrade
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After lots of burtrestores and alignment by Koji. The interferometer is live again.
The X/Y green beams are resonating. The X/Y arms were locked with IR. We saw the MI fringe on the POP. However, the AS spot is not visible. Needs
to check the optical table?
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Fri Jun 16 23:23:56 2023, Koji, Update, , IFO working after ETMX electronics upgrade
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Remaining work:
Hardware
The +/-15V power supply for the Eurocard crate has not yet turned on. Check the functionality of the modules. [Done ELOG |
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Mon Jun 19 01:05:49 2023, Koji, Update, , IFO working after ETMX electronics upgrade
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ETMX Eurocard Crate investigation ~ Summary
- The eurocard crate was not properly grounded, which had created a weird powering condition.
- Some busted components on the QPD whitening were replaced. The channels were |
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Wed Jun 21 08:21:03 2023, JC, Update, , IFO working after ETMX electronics upgrade
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Andrei asked me yesterday for the location of the ambient temperature sensor for the X-end. He mentioned that he needed to run so tests because there
were ~80° spike over the weekend. After I walked him over, I noticed that the sensor itself was crooked. We may have hit it when we were removing all
the ancient cabling from the rack. I removed the sensor and soldered the sensor back on. The Temperature monitor is now working without an issue. |
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Thu Jun 22 00:27:27 2023, Koji, Update, , IFO working after ETMX electronics upgrade
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[Koji, Hiroki]
ETMX OPLEV QPD was fixed.
- What we knew was that the QPD head drains +15V when it was connected to the I/F board. |
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Thu Jun 22 00:47:00 2023, Koji, Update, , IFO working after ETMX electronics upgrade
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[Mayank, Koji]
ETMX Sat amp (D080276) CH3 PD receiver circuit fixed.
At today's meeting, Yuta reported that ETMX LL OSEM had no response. |
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Thu Jun 22 01:04:42 2023, Koji, Update, , IFO recovery
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I wanted to check the oplev functionality but the IFO was not well aligned. So started the CDS recovery.
Here is the procedure
- Played a CDS restarting whack-a-mole: a host suffered from DACKILL (DK), so reboot the machine. And this made the other |
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Thu Jun 22 22:34:43 2023, Koji, Update, , IFO recovery
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[Hiroki, Mayank, Koji]
The X end PZT driver for green alignment:
The driver module was inserted to the Eurocard crate. Turned on the 100V HV supply. There was nothing dramatic seemed to happen.
There |
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Thu Aug 31 10:15:21 2023, Radhika, Update, , Electronic CARM to ALS CARM handoff
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[Paco, Radhika]
ALS control of CARM
Yesterday evening, Paco and I aimed
to: |
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Thu Sep 7 21:09:17 2023, Paco, Update, , eCARM and eDARM to ALS CARM and ALS DARM
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Tonight I managed to lock CARM and DARM under ALS control only
Configuration
Arm cavities well aligned, TRY ~ 1.07, TRX ~ 0.98, GTRY ~ 1.2, GTRX ~ 0.77
HEPA off, WFS 60s offloaded, PD offsets removed, |
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Mon Sep 25 17:01:46 2023, Murtaza, Update, , IFO ALIGNED (WITH SOME ISSUES)
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[JC, Paco, Radhika, Murtaza]
IFO ALIGNED
1. WFS Relief
We tried to change the gain to offload the offsets in the reliefMCWFS script but it The gains might need some tuning |
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Tue Sep 26 14:07:00 2023, Murtaza, Update, , IFO ALIGNED (WITH SOME ISSUES)
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[Paco, JC, Murtaza]
[WIP]
To fix the WFS loops, went through the following steps |
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Thu Sep 28 12:43:02 2023, Radhika, Update, , IFO ALIGNED (WITH SOME ISSUES)
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While aligning today I realized the cavAlign step sizes and step factors had not been updated after the upgrade.
Here are the new MEDM command arguments to launch cavAlign. Only factors not equal to 1
are listed. The updates made by me are in red |
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Thu Sep 28 16:45:54 2023, Murtaza, Update, , IFO ALIGNED (WITH SOME ISSUES)
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[Rana, Radhika, Murtaza]
WFS Loop Debugging
- We turned on the WFS loops with very
small gain (0.01) to see how the error signals behave. There is an existing template to look at the error signals in ndscope (users->Templates->ndscope->IOO->WFS->WFS-overview.yml). |
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Wed Mar 3 18:32:25 2010, Alberto, Update, 40m Upgrading, 11 MHz RFPD elctronics
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** Please add LISO file w/ component values.
I designed the circuit for one of the 11 MHz photodiodes that we're going to install
in the 40m Upgrade.
This is a simple representation of the schematic: |
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Thu Mar 4 08:43:35 2010, Alberto, Update, 40m Upgrading, 11 MHz RFPD elctronics
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Quote:
** Please add LISO file w/ component values.
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Thu Mar 4 19:53:56 2010, Alberto, Update, 40m Upgrading, 11MHz PD designed adjusted for diode's resistance; 55 MHz RFPD designed 6x
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After reading this
study done at LIGO MIT in 1998 I understood why it is difficult to define an effective impedance for a photodiode.
I read a few datasheets of the C30642GH photodiode that we're going to use for the 11 and 55 |
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Thu Mar 4 22:07:21 2010, rana, Update, 40m Upgrading, 11MHz PD not yet designed
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Use 10 Ohms for the resistance - I have never seen a diode with 25 Ohms.
p.s. PDFs can be joined together using the joinPDF command or a few command line options of 'gs'. |
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Tue Mar 23 22:46:43 2010, Alberto, Update, 40m Upgrading, REFL11 upgraded
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I modified REFL11 according to the changes lsited in this
schematic (see wiki / Upgrade 09 / RF System / Upgraded RF Photodiodes ).
I tuned it to be resonant at 11.06MHz and to have a notch
at 22.12MHz.
These are the transfer functions that I measured compared with what I expected from the LISO model.
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Wed Mar 24 14:57:21 2010, Alberto, Update, 40m Upgrading, REFL11 upgraded
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Hartmut suggested a possible explanation for the way the electronics transfer function starts picking up at ~50MHz. He said that the 10KOhm
resistance in series with the Test Input connector of the box might have some parasitic capacitance that at high frequency lowers the input impedance. |
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Thu Mar 25 17:32:42 2010, Alberto, Update, 40m Upgrading, REFL55 Upgraded
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I upgraded the old REFL199 to the new REFL55.
To do that I had to replace the old photodiode inside, switching to a 2mm one.
Electronics and optical transfer functions, non normalized are shown in the attached plot. |
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Sat Apr 3 19:54:19 2010, Alberto, Update, 40m Upgrading, REFL11 and REFL55 PDs Noise Spectrum
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These are the dark noise spectrum that I measured on the 11MHz and 55MHz PD prototypes I modified.
The plots take into account the 50Ohm input impedance of the spectrum analyzer (that is, the nosie is divided by 2).
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Mon Apr 5 10:23:40 2010, Alberto, Update, 40m Upgrading, REFL11 Low Frequency Oscilaltion Reduced
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After adding an inductor L=100uH and a resistor R=10Ohm in parallel after the OP547A opamp that provide the bias for the photodiode of REFL11, the noise
at low frequency that I had observed, was significantly reduced.
See this plot: |