Nothing tripped. No obvious damage.
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.
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.
Instock WIMA caps refilled to a minimum 50 pieces each.
This NPRO has a tripping power output******
" Hi Eric,
I checked with the Engineer as Vincent is travelling.
“The lasers have serial number below 2000 which we cannot repair them, we only can repair NPRO laser has serial number 2000 or later.”
Customer Service Professional
Global Customer Service/Communication & Commercial Optical Products "
I was trying to get a lossmap measurement over the weekend but had some trouble first with the IMC and then with the PMC.
For the IMC: It was a bit too misaligned to catch and maintain lock, but I had a hard time improving the alignment by hand. Fortunately, turning on the WFS quickly once it was locked restored the transmission to nominal levels and made it maintain the lock for longer, but only for several minutes, not enough for a lossmap scan (can take up to an hour). Using the WFS information I manually realigned the IMC, which made locking easier but wouldn't help with staying locked.
For the PMC: The PZT feedback signal had railed and the PMC had been unlocked for 8+ hours. The PMC medm screen controls were generally responsive (I could see the modes on the CCDs changing) but I just couldn't get it locked. c1psl was responding to ping but refusing telnet so I keyed the crate, followed by a burt restore and finally it worked.
After the PMC came back the IMC has already maintained lock for more than an hour, so I'm now running the first lossmap measurements.
Southern Mexio is still shaking..... so as we
No sus tripped. Seimometers do not see the 5.3M ?
The first Faraday isolater rejected beam path from the NPRO is fixed.
There are no more double sided tape on this table.
Gautam and Steve,
All 3 show the same noise level ~80 nV / rt Hz at 1 kHz as shown. Batteries ordered to be replaced in the top 2
We'll do more measurement to see how can we get to 4 nV / rt Hz specification level.
Telescope front lens to wall distance 25 cm, GigE camera lenght 6 cm and cat6 cable 2cm
Atm3, Existing short camera can has 16cm lenght to lexan guard on viewport. Available 2" od periscope tube lenght is 8cm. The one in use 16 cm long.
Note: we can fabricate a lite cover with tube that would accomodate longer telescope.
Can we calibrate the AR coated M5018-SW and compare it's performance agains the 2" periscope
Look at the Edmond Optics 3" od camera lens with AR
This lower priced 1" apeture Navitar lens can be an option too.
Atm1, Now I can see dust. This is much better. The focus is not right yet.
Atm2, Chamber viewport wiped and image refocused. Actually I was focusing on the dust.
I calculated a better lens solution for the ETMX side view with the simple python script that's attached. The camera is still not as close to the viewport as we would like, and now the front lens is almost all the up to the end of the tube. With a little more playing around there maybe a better way, especially if we expand the repertoire of focal lengths. Using Steve's wonderful camera fixture I put the beam spot in focus. I turned the camera sideways for better use of the field of view, and now the beam spot actually fills the center area of the beam, to the point where we probably don't want more magnification or else we start losing the tails of the Gaussian.
We'll take a serious of images tomorrow, and will have an estimate of the scatter loss by the end of tomorrow.
Do not leave organic trash or food boxes in the 40m to attrack ants !
[ Gautam , Steve ]
c1susaux & c1iscaux were rebooted manually.
Had to reboot c1psl, c1susaux, c1auxex, c1auxey and c1iscaux today. PMC has been relocked. ITMX didn't get stuck. According to this thread, there have been two instances in the last 10 days in which c1psl and c1susaux have failed. Since we seem to be doing this often lately, I've made a little script that uses the netcat utility to check which slow machines respond to telnet, it is located at /opt/rtcds/caltech/c1/scripts/cds/testSlowMachines.bash.
The script can be executed by ./testSlowMachines.bash.
Lompoc 4.3M and 3.7M Avalon
Valve configuration: Vacuum normal
Note: Tp2 running at 75Krpm 0.25A 26C has a load high pitch sound today. It's fore line pressure 78 mTorr. Room temp 20C
Udit Kahndelwal received 40m specific basic safety traning on Friday, Oct. 27
IFO pressure 1.2e-5 Torr at 9:30am
Atm. 1, This was the vacuum condition this morning.
IFO P1 9.7 mTorr, V1 open, V4 was in closed position , ~37 C warm Maglev at normal 560Hz rotation speed with foreline pressure 3.9 Torr because V4 closed 2 days ago when TP2 failed .....see Atm.3
The error messege at TP2 controller was: fault overtemp.
I did the following to restored IFO pumping: stopped pumping of the annulose with TP3 and valves were configured so TP3 can be the forepump of the Maglev.
closed VM1 to protect the RGA, close PSL shutter .....see Gautam entry
aux fan on to cool down Maglev-TP1, room temp 20 C,
aux drypump turned on and opend to TP3 foreline to gain pumping speed,
closed PAN to isolate annulos pumping,
opened V7 to pump Maglev forline with TP3 running at 50Krpm, It took 10 minutes to reach P2 1mTorr from 3.9 Torr
aux drypump closed off at P2 1 mTorr, TP3 foreline pressure 362 mTorr.......see Atm.2
As we are running now:
IFO pressure 7e-6 Torr at Hornet cold cathode gauge at 15:50 We have no IFO CC1 logging now. Annuloses are in 3-5 mTorr range are not pumped.
TP3 as foreline pump of TP1 at 50 Krpm, 0.24 A, 24 C, it's drypump forline pressure 324 mTorr
V4 valve cable is disconnected.
I need help with wiring up the logging of the Hornet cold cathode gauge.
Our new Agilent Technology TwisTorr 84FS AG rack controller ( English Manual pages 195-297 ) RS232/485, product number X3508-64001, sn IT1737C383
This controller, turbo and it's drypump needs to be set up into our existing vacuum system. The intake valve of this turbo (V4) has to have a hardwired interlock that closes V4 when rotation speed is less than 20% of preset RPM speed.
The unit has an analoge 10Vdc output that is proportional to rotation speed. This can be used with a comperator to direct the interlock or there may be set software option in the controller to close the valve if the turbo slows down more than 20%
The last Upgrade of the 40m Vacuum System 1/2/2000 discribes our vauum system LIGO-T000054-00-R
Here the LabView / Metrabus controls were replaced by VME processor and an Epic interface
We do not have schematics of the hardware wiring.
We need help with this.
PSL shutter closed at 6e-6 Torr-it
The foreline pressure of the drypump is 850 mTorr at 8,446 hrs of seal life
V1 will be closed for ~20 minutes for drypump replacement..........
9:30am dry pump replaced, PSL shutter opened at 7.7E-6 Torr-it
Valve configuration: vacuum normal as TP3 is the forepump of the Maglev & annuloses are not pumped.
TP3 drypump replaced at 655 mTorr, no load, tp3 0.3A
This seal lasted only for 33 days at 123,840 hrs
The replacement is performing well: TP3 foreline pressure is 55 mTorr, no load, tp3 0.15A at 15 min [ 13.1 mTorr at d5 ]
Valve configuration: Vacuum Normal, ITcc 8.5E-6 Torr
Dry pump of TP3 replaced after 9.5 months of operation.[ 45 mTorr d3 ]
The annulosses are pumped.
Valve configuration: vac normal, IFO pressure 4.5E-5 Torr [1.6E-5 Torr d3 ] on new ITcc gauge, RGA is not installed yet.
Note how fast the pressure is dropping when the vent is short.
IFO pressure 1.7E-4 Torr on new not logged cold cathode gauge. P1 <7E-4 Torr
Valve configuration: vac.normal with anunulossess closed off.
TP3 was turned off with a failing drypump. It will be replaced tomorrow.
All time stamps are blank on the MEDM screens.
The TP3 foreline pressure was 4.8 Torr, 50K rpm 0.54A and 31C........Maglev rotation normal 560 Hz....... IFO pressure 7.2e- 6 Torrit was not effected
V1 closed ......replaced drypump.........V1 opened
IFO 6.9e-6 Torrit at 19:55, TP3fl 18 mT, 50Krpm 0.15A 24C
VM1 is still closed
Annuloses are not pumped for 30 days, since TP2 failed. IFO pressure 7e-6 Torr it, Rga 2.6e-6 Torr
Valve configuration: Vacuum Normal as TP3 is the forepump of Maglev, annuloses are not puped at 1.1 Torr
TP3 50K rpm, 0.15A 24C, foreline pressure 16.1 mTorr
There was a power outage.
The IFO pressure is 12.8 mTorr-it and it is not pumped. V1 is still closed. TP1 is not running. The Rga is not powered.
The PSL output shutter is still closed. 2W Innolight turned on and manual beam block placed in its beampath.
3 AC units turned on at room temp 84F
IFO pumped down from 44 mTorr to 9.6e-6 Torr with Maglev backed with only TP3
Aux drypump was helping our std drypump during this 1 hour period. TP3 reached 32 C and slowed down 47K rpm
The peak foreline pressure at P2 was ~3 Torr
Hornet cold cathode gauge setting: research mode, air,
2830 HV 1e-4A at 9.6e-6 Torr,
[ 3110 HV 8e-5A at 7.4e-6 Torr one day later ]
Annuloses are at 2 Torr, not pumped
Valve configuration: vacuum normal, RGA is still off
PSL shutter is opened automatically. Manual block removed.
End IR lasers and doublers are turned on.
NOTE: Maglev " rotation X " on vacuum medm screen is not working! " C1:Vac-TP1_rot " channel was removed. Use " NORMAL X " for rotation monitoring.
*We removed this (i.e. rotation) field from the MEDM screen to avoid confusion.
Bulb is replaced.
I noticed this behaviour since ~Dec 20th, before the power failure. The bulb itself seems to work fine, but the projector turns itself off after <1 minute after being manually turned on by the power button. AFAIK, there was no changes made to the projector/Zita. Perhaps this is some kind of in-built mechanism that is signalling that the bulb is at the end of its lifetime? It has been ~4.5 months (3240 hours) since the last bulb replacement (according to the little sticker on the back which says the last bulb replacement was on 15 Aug 2017
Five mechcanical traps set inside of boxes. Red-white warning tape on top of each.
Last jump at rack Y2.
We could use similar load cells to make the actual weight measurement on the Stacis legs. This seems practical in our case.
I have had bad experience with pneumatic Barry isolators.
Our approximate max compression loads are 1500 lbs on 2 feet and 2500 lbs on the 3rd one.
We've been thinking about putting in a blade spring / wire based aluminum breadboard on top of the ETM & ITM stacks to get an extra factor of 10 in seismic attenuation.
Today Koji and I wondered about whether we could instead put something on the outside of the chambers. We have frozen the STACIS system because it produces a lot of excess noise below 1 Hz while isolating in the 5-50 Hz band.
But there is a small gap between the STACIS and the blue crossbeams that attache to the beams that go into the vacuum to support the stack. One possibility is to put in a small compliant piece in there to gives us some isolation in the 10-30 Hz band where we are using up a lot of the control range. The SLM series mounts from Barry Controls seems to do the trick. Depending on the load, we can get a 3-4 Hz resonant frequency.
Steve, can you please figure out how to measure what the vertical load is on each of the STACIS?
Good going Johannes!
This evening I transitioned the slow controls to c1auxex2.
Gautam and I then proceeded to test basic functionality
Arms are locked, have been for ~1hour with no hickups. We will leave it like this overnight to observe, and debug further tomorrow.
I have just received the scheduling of the PSL self work for tomorrow. Gautam and I agreed that if it is needed I will shut the laser off and cover the hole table with plastic.
Measurements for good fit were made. The new shelf will be installed on next Tuesday at 2pm
The reference cavity ion pump is in the way so the cavity will be moved 5" westward. The shelf height space will be 10" Under shelf working height 18" to optical table.
[ Johannes, Rana, Mark and Steve ]
On the second trial the shelf was installed. Plastic cover removed. South end door put back on and 2W Inno turned on.
Shelf 10 " below the existing one: 92" x 30" x 3/4" melamine (or MDF) covered with white Formica. 200 lbs it's max load. Working distance to top of the table 18"
While moving the RefCav to facilitate the PSL shelf install, I bumped the power cable to the AOM driver. I will re-solder it in the evening after the shelf installation. PMC and IMC have been re-locked. Judging by the PMC refl camera image, I may also have bumped the camera as the REFL spot is now a little shifted. The fact that the IMC re-locked readily suggests that the input pointing can't have changed significantly because of the RefCav move.
1500 and 2000 lbs load cells arrived from MIT to measure the vertical loads on each leg.
M4 local earthquake at 10:10 UTC There is no sign of damage.
....here is an other one.........M5.8 Ferndale, CA at 16:40 UTC
pd80b rga scan at 175 day. IFO pressure 7.3e-6 Torr-it
Condition: vacuum normal, annuloses not pumped. Rga turned on yesterday.
The rga was not on since last poweroutage Jan 2, 2018 It is warming up and outgassing Atm2
Annual crane inspection with load tests is scheduled for Monday, Feb 5, 2018 from 8 to 11:30am
Konecranes rescheduled this appointment to: Monday, Feb 12, 2018
Hornet cold cathode gauge analoge output [ DSub9 pin 3 and 7 ] are wired to go ETMX Acromag. It was reading 4.9V at 7.8e-6 Torr [ 3,110 V 8.35e-5A ] at the end of a 24ft BNC cable. Now it has to be hook up to an Acromag channel.
This will replace the not functioning C1: Vac-CC1_pressure
gautam: the motivation behind hooking this gauge up to our DAQ system is that non-vacuum-system-experts have a quick diagnostic to make sure everything is in order. This gauge is physically placed adjacent to V1, and so if something goes wrong with our vacuum pumps, we would see the effect here immediately. we did note that occassionally, the reading fluctuated by ~1V on the DMM used to check the voltage output at the end of the BNC cable, so we still need to run some long-term stability analysis once this channel is hooked up to the Acromag. For future reference, in order to make this gauge work, we need to check that
The ETMX Sorrenson power supply -15V was running at -13.9V
Our 3 cranes passed professional inspection. Fred Goodbar of Konacrane with 450 lbs load at full extension.
Certificates will be posted in 40m wiki as they arrive.
The "called 225 lbs" steel crane load measured right on 102 kg
The trick to the measurment to maintain 1 mm gap to the central cilynder of the load cell.
The lead plate stabilized the large load.
gautam: some additional notes:
The forline pressure of TP3 was 399 mTorr
It was replaced this morning at TP3 controller 134,638hrs with the "failed TP2 station" drypump. The foreline pressure now at TP3 is 100 mTorr at 6 hrs of operation.[ at day 3 63 mT ]
IFO pressure at CC Hornet 7.9e - 6 Torr
Valve configuration: vacuum normal as TP3 is the forepump of the Maglev & the annuloses are not pumped
All rack power supplies labeled if their load changed.
We have the IFO pressure logged again! Thanks Johannes and Gautam
This InstruTech cold cathode ionization vacuum gauge " Hornet " was installed 2016 Sep 14
Here is the CC1 gauge history of 10 years from 2015 Dec 1
The next thing to do is put this channel C1:Vac-CC1_HORNET_PRESSURE on the 40m Vacuum System Monitor [ COVAC_MONITOR.adl ]
gautam 1pm: Vac MEDM screen monitor has been edited to change the readback channel for the CC1 pressure field - see Attachment #2. Seems to work okay.
Pumpdown 80 at 511 days and pd80b at 218 days
Valve configuration: special vacuum normal, annuloses are not pumped at 3 Torr, IFO pressure 7.4e-6 Torr at vac envelope temp 22 +- 1C degrees
CC1 old MKS cold cathode gauge randomly turns on- off. This makes software interlock close VM1 to protect RGA So the closed off RGA region pressure goes up and the result is distorted RGA scan.
CC1 MKS gauge is disconnected and VM1 opened. This reminds me that we should connect our interlocks to CC1 Hornet Pressure gauge.
Valve configuration: special vacuum normal, annuloses are not pumped at 3 Torr, IFO pressure 7.4e-6 Torr at vac envelope temp 22 +- 1C degrres
MCRefl is absent, it is under investigation. I removed a bunch of hardware and note all spare optics along the edges.
Till RIN measurement noise eater is off on 2W laser. The inno 1W has no noise eater.
2010 power v current table is below.
Koji and Kevin measured the output power vs injection current for the Innolight 2W laser.
The threshold current is 0.75 A.
The following data was taken with the laser crystal temperature at 25.04ºC (dial setting: 0.12).
Earth quake M5.3 2018-04-05 19:29:16UTC Santa Cruz Island, CA