Shutter moved, no more clipping.
Pick-off mirror 2" replaced by 1" one. Laseroptik HR 532nm, incident angle 30-45 degrees, AR 532 nm
Green REFL PD moved to 4" close to pick-off mirror. Pd being close to pick-off does not separate multiple reflections on it. I'll replace Laseroptic mirror with Al one. It is not easy to find.
Hole cut into side wall for doubler oven cable to exit.
Beam trap for Pd refl is in place. Cabeling is ti·died up.
Laseroptic 1" mirror is replaced by Al 1" mirror. Problem remains the same. This diffraction patter has to be coming from the Faraday.
Atm1, good separation when Pd is far
Atm2, bad separation when Pd is close
Beam trap for Pd refl is in place. Cabeling is ti·died up.
The extra high post 3.375" for PZT is ready. We also have 2 more 2" green Laseroptik mirrors. I'm ready to swap them in.
The 75 mm focal length lens was placed in front of the green REFL PD yesterday.
1, Vacuum envelope grounds must be connected all times! After door removal reconnect both cables immediately.
2, The crane folding had a new issue of getting cut as picture shows.
3, Too much oplev light is scattered. This picture was taken just before we put on the heavy door.
4, We were unprepared to hold the smaller side chamber door 29" od of the IOC
5, Silicon bronze 1/2-13 nuts for chamber doors will be replaced. They are not smooth turning.
Fred Goldbar of KoneCranes will come 7:30am Wednesday, September 4 to look at this issue.
It is changed to Thursday morning.
Valve configuration: Vacuum Normal
I cleaned up around MC2 and 1Y1 area this morning.
ETMY NPRO moved from the side to the center of the low shelf. Thorlab catalog " as spacer " removed after lunch.
The Lightwave Controller values: LT 40.4C, LTEC +0.1V, T 41.041C, Pwr 239 mW, Adj 0, DC 1.82A, DPM 0.0V, Neon OFF, Ldon OFF, Display 5, DT 21.0C, Dtec +1.0V
B grade Nobel is awarded.
If cables could dream?
This skill should be mandatory for LIGOX graduates.
~Vancuver, Canada earthquakes: magnitude 6, 5 and more shaking
I think the crane repair guy accidentally stepped on the BSC support beam.
PRM side is not coming down.
[Fred Goldbar, Mike Gerfen, Dennis Coyne and Steve]
We inspected the hinge, 1.25" cross pin and I-beams. It is hard to explain what is causing the folding I-beam corner to jam against the main I-beam.
To limit the motion of the folding I-beam cross pin bushing will be added. This will take a week to complete.
KoneCrane contact John McDaniel (562) 903 - 1371,
Wednesday, September 18, folding I-beam will be removed. KoneCrane will start working at 7:30am and they should be out by 12:30pm
Friday, September 20, reinstalling machined hinge on the I-beam. Same timing schedule as Wednesday.
TP3 foreline's dry pump is getting noisier and noisier. Turbo TP3 is pumping on the annulos. The foreline pressure is 7.2 mTorr and it is not degrading. It was swapped in March 5, 2013
The seal is very good, but the bearing is dying.
The drypump is replaced at 95,781 hrs on TP3 controller time. The foreline pressure is 30 mTorr and dropping.
It is 13 mTorr after 17 hours of pumping.
Finally we reached 1.0e-5 Torr, cc1 (h) at day 41. There must be a leak or cold cathode gauge is not reading correctly. The gauge is new. It should not take this long.
All chamber annulos pressures are normal.
The folding beam removed as shown. Two man supporting it while I hammering it out. Pin was dry and it gulled into supporting hinges.
The rotating hinge will be machined and bushing will be added with Zerk fitting or similar. This will allow lubrication in the future.
see elog #9111
Local m3.8 eq shakes PRM lose.
Ottavia, Rossa and Pianosa are running out of storage space.
I'm working on it.
Atm1, The folding arm is back on with 0.1" misalignment at no load in the trolly's way. The other side of the I beam is 0.02" higher than the main beam.. New bushing and pin were greased up with Krytox before installation.
The axial Zerk 1/8" pipe in the pin upper end can not take any fitting. There is no room. It is taped off.
This gap comes down to ~ 1/16" at fully extended arm with 225 lbs load at the end of it.
The present plan is to grind down the the misalignment of 0.1" for a slow-loaded trolly.
Steve Baker of Konacranes will be back to grind down this ridge and load test at 500 lbs on Tuesday, OCT 1, 2013
Liyuon will set up a ~5 mW He/Ne laser for waist measurement for LIGO oplev telescope.
This will be between the beam tube and the CES wall. He will do his tests in the morning.
We are out of JDSU-Uniphase 1103P heads. I'm ordering some right now. I'm planning to make some corrections on Rana's list tomorrow morning at ETMY.
Steve Baker of Konecranes will be back to grind down this ridge and load test at 500 lbs on Tuesday, OCT 1, 2013
Konecranes rescheduled the completion of the Vertex crane to Wednesday, Oct. 2
How can we improve the cleanliness of the 40m IFO room 104 ? May be Mario Batali crocs if you chief chef of the lab likes it. We can do more effective things.
Atm 1 is showing the lab air quality dependence on outside air measured at the top of the IOO chamber. This made me to measure the differential pressure between lab and out side.
Properly sized air conditioner is over pressurizing it's room by 0.05 [" Water] like clean assembly room.
The 40m at Vertex location is barely getting pressurized to 0.01 " W
The control room is OK with 0.04 " W but it's air quality is very bad! It is 10x worse at 0.5 micron than IFO room.
Every entry from well pressurized control room into barely pressurized IFO pumps dirty air to our "clean room."
This door should be closed.
The drill- room entry is ideal because it is using the same air conditioner as the main lab, therefore it has cleaner air.
Things to do: seal holes of CES walls, seal paint wall at south end so it will shed less, replace gas kits on doors.
I have plugged the cable tray space entering the control room above Rosalba.
The smoke alarms were turned off and surrounding areas were covered with plastic.
The folding I-beam was ground down to be in level with the main beam.
Load bearing cable moved into correct position. New folding spring installed.
Crane calibration was done at 500 lbs at the end of the fully extended jib.
Than we realized that the rotating wheel limit switch stopped working.
This means that the crane is still out of order.
As another proof that sometime is ill with ETMX Optical Lever:
We scanned the ETMX bias in PIT using ezcastep and saw that the OL response is very screwy. In the attached, you can see that the ETMX SUSPIT signal shows that the actual motion is good and linear. In fact, our sus diagonalization is extermely good and there's almost no signal in SUSYAW.
ETMY oplev laser clearly showing a tail when it was projected up the sealing.
PS (10-4-2013): I checked the beam quality again as it was removed from the table: it had a good image at 3 meters
RA: I'm not sure how to interperet this; I think that the SUM channel is divided by the SUM so that this is supposed to be RIN, but not sure. Can someone please take a look into the SUS model and then explain in the elog what the SUM normalization algorithm is?
PRM is dark. PRM and SRM oplev servos are off. ETMY is not centered.
This was the second week without wet mopping the floor and wet wipe down of the vacuum envelope.
We changed filters on the 40m "HEPA" vacuum pump. It still has very dirty exhaust. Do not use it in clean room!
[Alan, Koji, Manasa]
Record number of 50 freshmen were given tour of the 40m this afternoon.
Chris Couste, our new undergrad help received 40m specific, basic safety training yesterday.
Power spetrum of ETMX and ETMY in the view of oplev pitch and yaw.
Atm1 bandwidth 0.01 Hz ETMY plot is different from
Atm2 bandwidth 0.1 Hz normal ??????? They should be the same !!!!
ETMX _OPLEV_...ERROR signals are effected by turning ON the flow bench motor at the south end
The broadband noise [~ 5-60 Hz] is much higher when the motor is running.
The flow bench was turned off.
Sunday evening fireworks. Manasa heard it.
I have just turned on the PSL Innolight laser. The laser shut down with unknown reason a day ago.
The 4th week of no wet mopping of the floor and no wet wiping the vacuum envelope.
We cleaned the intakes of the south arm IFO air condition. The bottom duct have quite a bit accumulation Atm1
See wet wiped contrast on Atm2
We found 3 holes around pipes ( coming from CES ) on the east wall that has to be sealed.
After closer examination of these holes, they are sealed off well.
ETMY sensors are glitching or getting kicked up.
Atm3, There is no seismic activity here.
Nice work. Congratulation
Atm1, The strong glitches are back.
Atm2, SUS-ETMX & Y_SENSOR_LL Damping OFF at (ref0 & ref1). damping ON (red & blue)
ETMY sus looks OK
I wonder what's drifting between the laser and the PMC? And why is it getting worse lately?
The PMC refl is bad in pitch today, and the transmission is only 0.76, rather than our usual 0.83ish.
I did a quick, rough tweak-up of the alignment, and now we're at 0.825 in transmission.
The PMC transmission continuously degrades. In order to see what is really drifting the laser output after PBS was sampled as shown.
We have tried to ssh into c1iscey yesterday morning. It just did not work. We have just tried it again (now) and it did work.
Lesson learned: always shut down the computer from a TERMINAL Do not turn it off by the manual power switch.
Steve, can you please put 2 mounted razor dumps near the WFS for this purpose??
Tuesday: Razor dumps are waiting for you.
I couldn't find any dumps near the WFS. Koji looked. I looked twice. Maybe they are spooky and absorbing all of the light?
The MC alignment was bad and the WFS were making it drift. Koji aligned the beam into the PMC. I then restored the MC suspensions to where they were 8 days ago (back when the transmission and reflection were good). With the WFS OFF, this gave us a MC trans ~ 16000. With WFS ON it goes to 17500 which is about as good as its been over the last 80 days.
I centered the beam on the WFS with the MC unlocked and also centered the beam on the whole WFS path (it was near clipping between WFS 1 & 2). Also for some reason that beamsplitter which steers the beam onto WFS1 is a R=33% (!? why is this not a R=50% ??).
Steve, please swap this out to a BS1-1064-50-1025-45S if we have one sitting around. If not, we want to add this to the CVI purchase list, but not buy until we get a bigger list together.
I also centered this newly aligned beam into the IMC onto the PSL QPDs. We should now use these as a pointing reference for the beam into the IMC.
While doing this I noticed that the beam was almost clipping on the Uniblitz shutter used to block the PSL beam. That shutter is mounted too short and was also not centered horizontally. I removed it for now so that Steve can find a more adjustable mount for it and put it back into play. The beam going into the IMC is BIG, so you have to very careful when centering the shutter. Might be that we cannot leave it at 45 deg and still get a big enough aperture.
Note #3 for Steve: please also replace the mount for last steering mirror into the IMC with a Polanski or a Superman, that black Ultima is no good. Also the dogs must be steel - no aluminum dogs for our sensitive places.
No wonder they could not find the beam dumps. Last night was Haloween. They should of just said: Trick or treat! where are the beam dumps?
I was working on the electronics bench and what sounded like a huge truck rolled by outside. I didn't notice anything until now, but It looks like something became misaligned when the truck passed by (~6:45-6:50 pm). I can hear a lot of noise coming out of the control room speakers and pretty much all of the IOO plots on the wall have sharp discontinuities.
I haven't been moving around much for the past 2 hours so I don't think it was me, but I thought it was worth noting.
The PMC auto locker is not set to acquire error message made me lock PMC manually. Arms locked instantly: TRY 0.9 V and TRX 0.65 V
The PSL shutter is reinstalled.The base plate is delrin for isolation and the mount height is adjustable. The last steering mirror mount to be swapped in is ready. It is sitting on the top of the ITMX optical table cover with SS dogs.
There are two reflected spots on the north side of the Uniblitz shutter. They are coming from the vacuum window. They should be trapped also.
The IOO Angle and IOO Position qpds were recentered after this entry.
Suggested corrections in elog entry #9323 are completed:
1, last steering mirror mount replaced by Polanski mount
2, PSL output shutter mount reconfigured
IOO qpds are not centered. I failed to connect laptops to 40MARSian network.
Full list tomorrow: IP-Ang & Pos, ETMY-T, ETMY-Oplev, ETMX-T, IOO-Ang & Pos
RA: No one in the control room this evening can understand what this ELOG means. Please use more words.
Yesterday the last steering mirror mount on the PSL was changed, Manasa recovered the MC alignment and Jenne locked the arms.
I centered the following qpds: ASC-IBQPD, LSC-TRY, SUS-ETMY_OPLEV, LSC-TRX, SUS_ETMX_OPLEV
Touching the PSL pointing IOO-QPD_ANG & POS was a mistake. We lost the reference of the well refined MC input.
One and 20 days TRENDS plot showing the PSL output drift in pitch can be power drop
However initial pointing is amazingly good. ( I wonder about the lens in front of the qpd ?)