 Tue Sep 5 17:18:17 2017, Kira, Update, PEM, temp sensor update 
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Today, I stuck on the sensors to a metal block using a flag, rubber bands, and some thermal paste (1st attachment). I then wrapped the whole thing in
about 4 layers of insulation and a lot of tape (2nd attachment). The only things leading out of the box were the three connections to the sensors and a
thermometer. I then connected the wires to their respective places on the board of the sensor. To get the readings out we would need to use an ADC. Gautam |
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Tue Sep 5 17:52:06 2017, Kira, Update, PEM, temp sensor update
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to get the sensors to read the same values they have to be in direct thermal contact with the metal block - there can't be any adapter board in-between
for the 2nd attempt, I also recommend encasing it in a metal block rather than just one side. You can drill some 7-10 mm diameter holes in an
aluminum or copper block. Then put the sensors in there and plug it up with some thermal paste. |
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Fri Sep 8 10:22:30 2017, Steve, Update, PEM, temp sensor update
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The weight of SS can with copper liner is 12.2 kg
Is 1 Amp for the heating jacket going to be enough? We should have some headroom.
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Tue Sep 12 11:44:16 2017, Kira, Update, PEM, temp sensor update
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Got it to work. A cable was broken and the AD586 also broke at the same time so it took a while to find the problem. I had to create a makeshift cable
out of three parts so once I replace it for an actual cable, it will be good to go for a test.
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 Mon Nov 24 19:15:16 2008, rana, alberto, john, Configuration, Environment, temperature
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The PSL Room Temperature was alarming because it had gone above 23 C. This set off an unfortunate chain of events:
We found that the PSL HEPA was set low (20%). This is a fine setting for when no one is working in there but it
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Tue Nov 25 19:29:15 2008, rana, alberto, john, Configuration, Environment, temperature
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[quote]The PSL Room Temperature was alarming because it had gone above 23 C. This set off an unfortunate chain of events:
We found that the PSL HEPA was set low (20%). This is a fine setting for when no one is working in there but it
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Thu Nov 27 22:56:42 2008, rana, Configuration, Environment, temperature
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| 8-) |
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Tue Feb 6 16:58:19 2018, Kira, Update, PEM, temperature measurements
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I decided to plot the temperatures measured over two days for the sensor inside the can and inside the lab just to see if there was any significant difference
between the two, and obtained the following plot. This shows that there is a difference in measurements of a few 0.01 C. The insulated seismometer can
didn't change temperature as much as the lab did, which is as expected. I'll work on properly calibrating the sensors sometime in the future so |
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Sun Feb 22 23:43:07 2009, caryn, Summary, General, temperature sensor 12x
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Comparing PSL-FSS-RMTEMP and PEM-MC1-TEMPS
So, to compare temp channels, I made a plot of PSL-FSS_RMTEMP and PEM-MC1_TEMPS(the test temp sensor channel after converting from cts to degC).
This plot begins about 2 months ago t_initial=911805130. The temperature channels look kinda similar but MC1-TEMPS (the temp sensor clamped to MC1,3 chamber) |
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Thu Aug 10 14:13:23 2017, Kira, Summary, PEM, temperature sensor
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Goal is to build a temperature sensor accurate to 1 mK. Schematic is shown below. This does not take into account the DC gain that occurs.
Parts that would be used for this: LM317 regulator, AD592
temperature transducer, OP amp (low input noise and high impedance), 100K (or maybe 10k) resistor. This is what is currently proposed, but the |
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Thu Aug 10 21:22:06 2017, rana, Summary, PEM, temperature sensor
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Should we use the AD590 or the AD592? They're sort of the same, but have slightly different packages and specs.
Given the sensitivity
of the AD590 to power supply drift, I would recommend using a precision voltage reference like the AD581 or AD587. Take a look at the datasheets and order
a few different varieties so we can see what works best for us. I believe that the voltage regulators have too much drift to use for precision temperature |
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Fri Aug 11 10:27:49 2017, Kira, Update, PEM, temperature sensor
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Since there seems to be little difference between AD590 and AD592, I guess we could just go with the AD590. The temperature noise spectrum in the first
graph are for the AD590, so if we want to reproduce those results, we should use AD590.
For the AD581/AD587, we could go with a few varieties that have the least output voltage drift, although I am not sure what precision we will |
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Fri Aug 11 10:48:39 2017, Kira, Update, PEM, temperature sensor
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| Quick update: we actually have AD587KRZ and AD592, so we could start by using that and seeing how it works. |
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Fri Aug 11 11:56:02 2017, rana, Update, PEM, temperature sensor
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Might as well order several of a few different varieties today. Its good to have some extra in stock; we don't always want to have to wait days for
parts to show up. If you give Steve a list of parts to buy he can order them today or Monday.
There should also be some precision 5V sources (e.g. AD586) that you can try. |
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Fri Aug 11 12:27:25 2017, Kira, Update, PEM, temperature sensor
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Used AD592CNZ and AD586 (5V output) to create a circuit that works and is responsive to temperature changes. At room temp, using ~1K resistor,
it showed ~0.3V across it, as expected. The voltage went up when we heated it with a heating gun. Next step will be to add in an OP amp and design some
experiments to check to see how accurate it is. Thanks to Gautam for helping me with it! |
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Mon Aug 14 09:49:18 2017, Kira, Update, PEM, temperature sensor
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Decided to try adding in an OP amp just to see if it would work. Added LT1012 and
a 100k resistor to the circuit (I originally wanted to do AD743
as it seems to be the best choice according to Zach's elog here, but it said that they |
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Mon Aug 14 12:52:33 2017, Kira, Update, PEM, temperature sensor
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I didn't realize that the LT1012 needed an additional input to function. I added in +15V and -15V to pins 7 and 4, respectively and placed a
10k resistor and the numbers make more sense now. The voltage showed a negative value, but it became more negative as I heated it up (it's negative
due to how a transimpedance amplifier works). |
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Tue Aug 15 13:32:38 2017, Kira, Update, PEM, temperature sensor
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Tested to make sure that even when only the AD586 was heated that there was no change in the reading. I did so by placing the AD586 away from the rest
of the circuit and blowing hot air only on it. There was, in fact, no change.
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Thu Oct 30 20:39:47 2008, caryn, Configuration, PEM, temperature sensor
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We attached the temperature sensor box to the MC1/MC3 chamber with a C-clamp. We connected the temp sensor to a 2nd box with a short BNC. Bob set up a power
cable coming from the X-end towards the MC1/MC3 chamber(Thanks, Bob!) We soldered the end of Bob's power cable to a plug and attached it to the 2nd box
(The power supply enters through the 2nd box). A ~20ft BNC cable connects the output signal of the 2nd box to the tall thing by the PSL where all the signals |
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Thu May 31 16:19:07 2012, yuta, Update, Green Locking, temperature setting for PSL doubling crystal
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I fixed the temperature control of the oven for the PSL doubling crystal.
The PID settings were not good, and also, TC200 was beging DETUNED. So, I activated TUNE function and adjusted PID settings.
I'm not sure what the DETUNE function is for. The manual can be found here; |
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Wed Mar 11 13:54:18 2015, Steve, Update, General, temporaly storage in the east arm
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| Green glass for aLIGO OMC shield is temporarly stored in the inside of the Y-arm. |
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Tue Jun 14 10:13:34 2016, Steve, Update, VAC, temporary N2 supply line
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The drill room floor will be retiled Thursday, June 16. Temporary nitrogen line set up will allow emptying the hole area.
Ifo room entry will be through control room. |
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Wed Jan 5 16:11:17 2011, kiwamu, Summary, IOO, temporary PZT connection
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This is a connection diagram for the input PZTs (i.e. PZT1 and PZT2). |
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Thu Oct 18 14:52:35 2007, rana, Routine, ASC, test
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[B]test[/B]
[LINE]X-(:P;(:)) |
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Fri Jan 27 17:49:41 2017, jamie, Update, CDS, test of new daqd code on fb1
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Just FYI I'm running a test of updated daqd code on fb1.
fb1 has it's own fiber to the daq network switch, so nothing had to be modified to do this test. This *should* not affect anything in the
rest of the system, but as we all know these are famous last words.... If something is going haywire, and you can't get in touch with me and |
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Fri Jan 27 20:52:36 2017, gautam, Update, CDS, test of new daqd code on fb1
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I'm not sure if this is related, but since today morning, I've noticed that the data concentrator errors have returned. Looking at daqd.log,
there is a 1 second timing mismatch error that is being generated. Usually, manually running ntpdate on the front ends fixes this problem, but it did not
work today. |
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Sat Jan 28 12:05:57 2017, jamie, Update, CDS, test of new daqd code on fb1
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Quote:
I'm not sure if this
is related, but since today morning, I've noticed that the data concentrator errors have returned. Looking at daqd.log, there is a 1 second timing |
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Thu Sep 30 11:07:20 2010, josephb, alex, Update, CDS, test points starting to work
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The centos 5.5 compiled gds code is currently living on rosalba in the /opt/app directory (this is local to Rosalba only). It has not been fully
compiled properly yet. It is still missing ezcaread/write/ and so forth. Once we have a fully working code, we'll propagate it to the correct
directories on linux1. |
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Fri Nov 20 11:14:22 2009, josephb, alex, Configuration, Computers, test points working on megatron and we may have filters with switch outputs built in
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Alex tooked at the channel definitions (can be seen in tpchn_C1.par), and noticed the rmid was 0.
However, we had set in testpoint.par the tst system to C-node1 instead of C-node0. The final number inf that and the rmid need to be equal.
We have changed this, and the test points appear to be working now. |
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Thu Mar 15 17:33:56 2018, Kira, Update, PEM, test setup
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I have attached the setup I completed today. The metal box contains the heater circuit and the board for the temperature sensor is right above it.
This is basically the same setup as before, but I've just packaged everything up neater. I expect to be able to perform the test tomorrow and begin
implementing PID control. I still need a DAC input for the heater circuit and the temperature sensor is having some issues as well. |
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Tue Mar 20 16:56:01 2018, Kira, Update, PEM, test setup
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The MOSFET was getting pretty hot, so I switched it out to a larger heat sink and it's fine now. I then used a function generator in place of the
DAC to provide ~3.5V. I got the current in the circuit to 1.7A, which is as expected, since we have 24V input, the heater resistance is 12.5ohm and the
resistor we are using is 1ohm, so 24V/(12.5+1)ohm = 1.7A. The temperature inside the can rose about 5 degrees in half an hour. The only issue now |
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Tue Mar 20 19:48:10 2018, gautam, Update, PEM, test setup
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according to the temp sensor readout, which was ~-3.35V which corresponds to ~335K, the temperature of the can is now 60
deg C. This is a bit warm for my liking so i'm turning the heater current down to 0 now by writing 0 to C1:PEM-SEIS_EX_TEMP_CTRL |
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Fri Mar 23 12:00:20 2018, rana, Update, PEM, test setup
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we don't ever want to use our 16 kHz real time system for such low frequency action; its main purpose is for real-time controls, whereas we are OK
with multiple seconds of delay in a thermal loop. The Python PID script is sufficient and highly reliable (after years of testing). |
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Fri Mar 23 12:45:08 2018, Kira, Update, PEM, test setup
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I fit the data that we got from the test. The time constant for the cooling came out to be about 4.5 hours. The error is quite large and we should add
a low pass filter to the temperature sensor eventually in order to minimize the noise of the measurements. |
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Thu May 17 15:38:19 2018, Kira, Update, PEM, test setup with seismometer
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I've moved my setup to the actual seismometer. I attached the temperature sensor to the seismometer (attachment 1) with duct tape, though this is
temporary. I will be monitoring the temperature fluctuations of the seismometer for a whole day then take the can off and repeat the test. The can isn't
clamped down so the insulation isn't perfect, so I'd expect to see some noticeable fluctuations even with the can on. I've also labeled the |
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Fri May 18 14:33:34 2018, Kira, Update, PEM, test setup with seismometer
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Here is the result of my test. I think I'll leave the can on over the weekend because there's a long period of time where the seismometer heated
up by 0.8 degrees so I can't fully see the fluctuations over a full 24 hour period. |
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Mon May 21 10:15:35 2018, gautam, Update, PEM, test setup with seismometer
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I guess it's fine for now while we are still finalizing the setup at EX, but we should eventually line up the seismometer axes with the IFO axes.
Is there a photo of the orientation of the seismometer pre heater can tests? If not, probably good to make some sort of markings on the granite slab /
seismometer to allow easy lining up of these axes... |
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Mon May 21 14:17:28 2018, Kira, Update, PEM, test setup with seismometer
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I have attached the graph for the seismometer temperature fluctuations over 3 days. As we can see, there is a noticeable fluctuation in daily temperature
as well as a difference between days in the maximum and minimum temperatures. I will repeat this test but take the can off to see if there's any difference
between having the can on or off. |
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Tue May 22 14:49:03 2018, Kira, Update, PEM, test setup with seismometer
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It appears that one of the wires was disconnected overnight or this morning so I wasn't able to gather data over a full 24 hour period. Perhaps someone
accidentally kicked it. I placed some cones in that area so hopefully the wires won't be in the way as much and I can get the data tomorrow. From the
data I do have it seems that the seismometer is at a colder temperature when the can is not on, though it is difficult to see by how many degrees the temperature |
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Wed May 23 14:50:33 2018, Kira, Update, PEM, test setup with seismometer
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This time the test went without issue. The first attachment is the data for the past 24 hours and the second attachment is the full data over 6 days.
The average temperature fluctuations (from highest point to lowest point) for the can on was 0.43 C and for the can off it came out to 0.55 C. In addition
the seismometer with the can off is about 1 C cooler than with the can on. I'd like to leave the can off until the end of the week so we can get a |
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Fri Sep 24 00:56:35 2010, koji, tara, Update, Electronics, testing TTFSS
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We found that a transistor was broken from yesterday spark too. We partially fixed TTFSS, and it should be enough
for testing purpose.
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Fri Sep 24 23:47:10 2010, koji, tara, Update, Electronics, testing TTFSS
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Q3, a PZT2222A transistor, on D0901846 is replaced by a GE-82. However, the board is still not fully function.
Since Q3, PZT2222A, was broken, I went to Wilson house and got some SP3904's for replacement. But somehow, |
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Sat Sep 25 19:01:13 2010, Koji, Update, Electronics, testing TTFSS
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How much current do you need for each voltages?
GE-82 was the only PNP transister I could find in the lab. It's too old but we just like to confirm any other components are still functioning.
Similarly, we can confirm the functionality of the other components by skipping those current boost transisters, |
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Tue Aug 30 11:42:29 2011, jamie, Update, CDS, testpoint.par file found to be completely empty
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The testpoint.par file, located at /opt/rtcds/caltech/c1/target/gds/param/testpoint.par, which tells GDS processes where to find the various awgtpman
processes, was completely empty. The file was there but was just 0 bytes. Apparently the awgtpman processes themselves also consult this file
when starting, which means that none of the awgtpman processes would start. |
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Thu Jun 21 09:01:18 2012, steve, Update, STACIS, the resurrection of STACIS -surf
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There is a small wood cabinet under the south end flow bench, labeled STACIS.
Unit is complete with extension cards and cables. |
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Tue Oct 12 15:51:18 2010, yuta, Bureaucracy, SAFETY, the 40m squad received safety training from Peter
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Yuta, Joonho, and Suresh received the Basic Laser Safety Training from Peter King today.
Now, we got homework. |
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Fri Jul 11 09:29:02 2008, steve, Update, PSL, the PMC still hangs up
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Morning alarms:
PMC high voltage is railing, it's auto locker is frosen
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Mon Sep 13 21:52:53 2010, kiwamu, Update, Green Locking, the X end laser is ON
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I turned ON the laser at the X end station, which had been OFF
for several weeks because of the crane business.
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Tue Aug 30 09:51:37 2016, Steve, Update, SUS, the chamber HEPA tents are back
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How to minimize particles entering the vacuum envelope.
Just the way it was in August 2011 vent and before. |
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Wed Aug 31 23:01:02 2016, gautam, Update, SUS, the chamber HEPA tents are back
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Some more numbers we found while working in/around the chamber today:
Particle counts
Area
0.3 |