The window is at the north west corner of the PSL enclosure.
The 1 mm thick BK7 window is AR coated both side R <0.08%, W2-PW1-1004-1064-0
The PZT stack is 0.75" OD, 0.25" thick with ~ 6 mm ID, motion range 2.5 micron at 200V
Soft silicon rubber isolation.
RXA: This is the opto-mechanical phase shifter that Steve has built for diagnosing scattered light problems. We put it into the reflected light path of any of the cavities and see if it can move the scattering noise from DC up to a higher frequency. e.g.:
The paper on this from GEO
This morning valve condition: V1, VM1, V4 and V5 valves were closed. IFO pressure rose to 1.3 mTorr
It was caused by low N2 pressure. Our vacuum valves are moved-controlled by 60-70 PSI of nitrogen.
When this supply drops below 50-60 PSI the interlock closes V1 valve. This is the minimum pressure required to move the large valves.
It is our responsibility to check the N2 cylinder pressure supply.
The vacuum valve configuration is back to VAC. NORMAL, CC1 4.8E-6 Torr
PS: Bob says that the second cylinder was full this morning, but the auto-switch over did not happen.
The TESCOM automatic changeover regulator [ model ACS 012-1011 ] manifold is most likely clogged. The new one will arrive 8-8-2014
This means that the IFO pressure may go up to a few mTorr when we change cylinder or V1 valve triggered because there is no nitrogen supply.
Ophir power meter gets new filter with calibration. This is not cheap. It was the second time we lost it.
Filter leash is attached.
All suspension damping restored. There had to be an earth quake.
TaraV - geology major undergrad - of Jenne's summer help received 40m specific basic safety training.
We observed one or two ants climbing over PMC optics without booties and safety glasses.
The floor was mopped with strong Bayer Home Pest Control solution in the Vertex area.
Do not work inside the 40m lab if you are sensitive to chemicals!
The floor is mopped again with strong PEST CONTROL SOLUTION in water in the Vertex area.
Do not plane to work in the IFO-room till noon if you are sensitive to chemicals!
Ants are back on the PSL table. We'll be mopping the floor with pest control solution tomorrow morning.
Flow bench effect on oplev error signal is here.
I turned off the south X-end flow bench.
This is the third safety glasses that I found laying around in the IFO lab lately. Safety glasses must be worn ALL times in the IFO room!
This rule is essential for your protection! Please do not enter if you can not put up with this regulation!
Also, while I was working on the PSL table, I heard noise that sounded like a bearing rolling around. I suspected the HEPAs, since the one on the north east corner of the table has a problem when it's turned up high (we've known about this for a long time), however turning off the HEPAs didn't affect the noise. The noise is strongest near the back of the PSL controller on the shelf above the table, and the PSL controller box is vibrating. So, I suspect that the fan on the PSL controller box is about to give out.
EDIT: To clarify, I mean the Innolight's controller.
The bearing is chirping in the back of the 2W Innolight laser controller. It is loud enough to hear it. I placed 4 soft rubber feet under the controller to avoid shaking other things on self.
The HEPA filter bearing becomes noisy at 50V
Keep it at 20V for low noise
The fan is dying. It is changing speed erratically and stops for short time periods. It is very likely to stop rotating soon. It will halt all operations in the lab. We can not see the PMC-T power because Manasa is working on
The air flow from the dying fan was kinda weak and we decided to give a help with an external fan.
Koji brought a fan taken from a junk found at EE shop in W.Bridge.
The fan has been tied to the cage of the existing fan using cable ties to provide air circulation.
So even if the existing one dies anytime, we still don't super-heat anything.
The power supply for the fan rests next to the controller.
The air from the fan ventilation was hot, and now with the additional fan this hot air is actually sucked
out with stronger flow. So this is relieving for now.
PMC transmission as an indicator of laser controller with extra fan solution: 8 and 1day plot
Interlock closed valve V1, V4, V5 and VM1 when the nitrogen supply run out. The IFO pressure rose to P1 1 mTorr
In order to recover Vacuum Normal valve configuration I did the following:
Replaced both nitrogen cylinders. Confirmed pneumatic nitrogen pressure 70 PSI. Opened valves V4 and V5
At P2 < 1 mTorr, Maglev rotation 560 Hz , V1 was opened.
VM1 was opened when CC1 pressure dropped below < 1e-5 torr
Please take a look at the N2 cylinders pressure on Friday to insure that there is enough for the week end.
The daily consumption is 600-700 PSI
Quad processor 2 & 3 were replaced.
The PRM sus gains checked OK
All other suspension oplev gains setting were checked out OK
ETMX sus damping restored
From old 40m elog 5-29-2007
I’ve received some fan pictures from our manufacturing center. Your system will have one of the two fans pictured. Please contact manufacture company for more information.
Agustin (TJ) Tijerina
Commercial Product Support Center
5100 Patrick Henry Dr., Santa Clara, Ca. 95054
Product Support: (800) 367-7890
The fans are ordered.
I was investigating several issues on the IFO. As many of you noticed and not elogged, ITMX had frequent kicking without its oplev servo.
Also I had C1:LSC-TRY_OUT flatted out to zero even though I could see some fringes C1:SUS-ETMY_TRY_OUT.
Restarted all of the realtime models (no machine reboot).
Now I don't find any beam on REFL/AS/POP cameras.
If I look at BS-PRM camera, I can see big scattering, the beam is in the BS chamber.
I jiggled TT1 but cannot find neither a Michelson fringe nor POP beam.
So far I can't figure out what has happened but I'm leaving the lab now.
IMC is locked fine.
I can see some higher order mode of the Yarm green, so the Y arm alignment is no so far from the correct one.
ITMX is kicked up periodically. ITMX_PD_MAX_VAR is lowered to 500 from 1350
It started at Friday morning 8-1
The Napa earth quake magnitude 6 did not have any effect on the suspensions.
The Goy phase upgrade was done nicely. The IOO pointing did not change. Credit owned to Nick and Andres.
IFO is locked right on.
The PSL HEPA was off. It was turned on and it is running at 30VAC now.
SN 46,795 of 2003 is back.
The SRM qpd was moved to accommodate the HeNe laser qualification test for LIGO Oplev use.
The qpd was saturating at 65,000 counts of 3 mW
ND1 filter lowering the power by 10 got rid of saturation. I epoxied an adapter ring to the qpd.
Atm3 was taken before saturation was realized with Koji's help.
Atm4 ND1 on SRM qpd. Now it is working and everything is moving.
ITMY oplev should be centered. I worked too much around it.
Q and Steve will follow elog 10028 entry to prepare the vacuum system for safe reboot
SRM as set up in Atm4 26,000 count compared with ETMY oplev servo in operation 7,500 counts for 3 days
Next steps: measure beam size at qpd,
place qpd on translation stage for calibration,
change 1103P mount to single one
Here's the sequence of the morning so far:
The IFO is still down, as the PMC won't lock without the rack power, and we haven't pinned down the shorting mechanism. We don't want the replacement sorensen to immediately blow when plugged in.
Smoking Sorensen could have triggered the smoke alarm!
Yesterday I called CIT Fire Protection Services very first to deactivate the sensors temporarily. The smoke alarm was turned back on right after the particle count dropped.
Their phone number is posted at the entry doors 104M and 104W as shown below.
Vacuum safe reboot required one hour of no pumping of the vac envelope.
SRM qpd is installed on translation stage and the shims removed from laser V mounts.
The ETMY oplev servo is on.
SRM oplev servo: 100 microrad/count is an estimate, not calibrated one.
SRM qpd is back to its normal position. The mount base is still on delrin base. SRM and ITMY need centering.
Tomorrow I will set up the HeNe laser test at the SP table with Ontrack qpd
ETMY oplev servo on. SRM qpd with ND1 ------no component------- 1103P
IP POS cable was swapped with old SP-QPD sn222 at the LSC rack. So there is NO IP POS temporarily.
This QPDsn222 will be used the HeNe oplev test for aLIGO
QPDsn222 is on translation stage with ND2 filter on SP table. The 1103P is mounted with two large V mounts 1 m away.
This qpd will be calibrated Monday. It has only slow outputs.
Some one already took off the filter and did not care to put it back on. This is carelessness!
The PRM side was kicked up
Our janitor turned off the laser accidentally.
The Uniblitz shutter is insulated at the optical table. I only realized it when it was in my hand. The 3"x2" base plate is black DELRIN !
In the future we must label black Delrin base plate where it is used. Now we have white Delrin and light bran PEEK base plates for the same function.
TEST QPD sn 222 was calibrated with 1103P directly looking into it from 1 m. ND2 filter was on the qpd.
The room temp drops 1 degree C on the 4th day. The weather has changed.
Jam nuts checked. Oplev servos turned off. Particle count checked. Vertex crane functionality checked.
The vent is completed. ITMX was kicked up accidentally. Valve configuration: chamber open, RGA is pumped through VM2 Maglev