Valve configuration: Vacuum Normal
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 ?)
The north side of the LSC rack is full. I installed more DIN connectors with fuses on the south side of the rack 1Y2
The access to this may be a little bit awkward. You just remove the connector, wire it and put it back in.
The qpd sees the power drop as position change.
The laser monitoring screen shows little changes of the Innolight 2W output. See elog 9292 to compare
So why does the PMC downgrade if the laser output is stationary ?
The PMC-T power is down to 0.75V The auto locker does maximize power output.
It needs a manual alignment touch up.
New limit switch will be installed tomorrow morning
Konecranes postponed installation Friday morning Nov. 8
Friday 5pm : Konacranes promising to be here 8am Monday, Nov 11
It was rescheduled on Tuesday again for Wednesday, Nov 13
New limit switch installed and tested. The crane is back in full operational mode. Two spare limit switches on hand.
IR off for 11 minutes. The PRM face sensors are effected. The PRM side and the rest of the SUS OSEMS are not effected.
Sorry to say but MC1, MC2, MC3 and PRM face OSEMS are having the same problem of leaking IR into the sensors
The PMC was not locked for 11 minutes on this plot.
ETMY sus damping restored
This is a proposal to move WFSs such way that their reflected beam can be trapped.
Later ps: Nic will take care of the Gouy phase telescopes.
We have implemented an SR560-based ISS loop using the AOM on the PSL table. This is a continuation of the work in 40m:9328.
We dumped the diffracted beam from the AOM onto a stack of razor blades. This beam is not terribly well separated from the main beam, so the razor blades are at a very severe angle. Any alternatives would have involved either moving the AOM or attempting to dump the diffracted beam somewhere on the PMC refl path. We trimmed the RF power potentiometer on the driver so that with 0.5 V dc applied to the AM input, about 10% of the power is diverted from the main beam.
We ran the PMC trans PD into an AC-coupled SR560. To shape the loop, we set SR560 to have a single-pole low- pass at 300 Hz and an overall gain of 5×104. We take the 600 Ω output and send it into a 50 Ω feed-through terminator; this attenuates the voltage by a factor of 10 or so and thereby ensures that the AOM driver is not overdriven.
The AOM driver's AM input accepts 0 to 1 V, so we add an offset to bias the control signal. The output of the 50 Ω feedthrough is sent into the 'A' input of a second SR560 (DC coupled, A − B setting, gain 1, no filtering). Using a DS345 function generator, a 500 mV offset is put into the 'B' input (the function generator reads −0.250 V because it expects 50 Ω input). The 50 Ω output of this SR560 is sent into the AOM driver's AM input.
A measurement of suppressed and unsuppressed RIN is attached. We have achieved a loop with a bandwidth of a few kilohertz and with an in-loop noise suppression factor of 50 from 100 Hz to 1 kHz. This measurement was done using the PMC trans PD, so this spectrum may underestimate the true RIN.
A small followup measurement. Here are spectra of the MC trans diode with and without the ISS on. The DC value of the diode (in counts) changed from 17264.2 (no ISS) to 17504.3 (with ISS), but I didn't account for this change in the plot.
There is a small inkling of benefit between 100Hz and 1kHz. Above about 100Hz, the RIN is suppressed to about the noise level of this measurement. Below 100Hz there is no change, which probably means that power fluctuations are introduced downstream of the AOM, which argues for an outer-loop ISS down the road.
Atm #2 is in units of RIN.
I have disconnected the cable from the SR560 to LSC -ch8 for 15minutes this morning. It is moved from the floor to the top of the chambers as preparation for 40m tour. The SR560 seems to be overloading.
The ISS servo is off according to the MEDM screen. Why MC-T plot showing zero? The MC was happy yesterday.
PRM is aligned. IFO is not locked. It is just flashing, including arms. Olympus SP570UZ camera used without IR blocker. Note: PRM side OSEM does not show IR effect.
I will take more pictures with IOO IR blocked and HeNe oplev blocked tomorrow morning.
Can't we somehow hook up this camera to the MUX with the movie mode?
I think both the MUX and the sensoray are compatible with the color video signal.
Only the old CRT is B/W.
Watek 902H ccd with Tamron M118FM50 lens is hooked up to MUX Please be careful! In this set up the lens is close to the view port glass window!
The PMC power degrading on this 3 days plot. MC2 -T = 14,200 counts. C1:IOO-MC_TRANS_SUM can not be ploted in dataviewer. The MEDM screen has a valid number.
Initial pointing is not so bad (what does "not so bad" mean ???)
C1iscey comes and goes again.