Den Martynov received 40m specific 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 SOS coil drivers (Atm2) were moved from 1X1 to 1Y2 location. Is this the best place to locate the IOO Tip-Tilt steering that will replace the PJ-PZT ?
See 40m wiki T-T
There had to be a power outage. Laser and air condition turned back on. The vacuum is OK
Sorensen DC power supplies were tripped, so they were reset: at AUX OMC South 18V and 28V for RF PS and at 1X1 24V
Power Outage confirmed:
** Notification **
CALIFORNIA INSTITUTE OF TECHNOLOGY
Date: Thursday October 04,2012
This morning at 2:17 a.m. much of the City of Pasadena including our Campus experienced a electric power sag of short duration, approximately 1/10 of a second. The cause was a fault on one of Pasadena’s 17KV circuits. Some sensitive equipment have been impacted.
Contact: Mike Anchondo x-4999
All the front end machines are back up after the outage. It looks like none of the front end machines came back up once power was restored, and they all needed to be powered manually. One of the things I want to do in the next CDS upgrade is put all the front end computers in one rack, so we can control their power remotely.
c1sus was the only one that had a little trouble. It's timing was for some reason not syncing with the frame builder. Unclear why, but after restarting the models a couple of times things came back.
There's still a little red, but it mostly has to do with the fact that c1oaf is busted and not running (it actually crashes the machine when I tried to start it, so this needs to be fixed!).
The RGA was not effected by the short power outage.
40 plus freshmen visited the 40m today
The new cold cathode gauge CC1 is in place. We were at atmosphere for 28 days ......more later
cc1 = 2.3e-5 Torr at day 6 vacuum normal
After looking at the in-vacuum layout I think we should make two changes during the next vent:
1) Reduce the number of mirrors between the FI and its camera. We install a large silvered mirror in the vacuum flange which holds the Faraday cam (in the inside of the viewport). That points directly at the input to the Faraday. We get to remove all of the steering mirror junk on the IO stack.
2) Take the Faraday output (IFO REFL) out onto the little table holding the BS and PRM Oplevs. We then relocate all 4 of the REFL RFPDs as well as the REFL OSA and the REFL camera onto this table. This will reduce the path length from the FI REFL port to the diodes and reduce the beam clutter on the AS table.
1) Mirror mount holder for "large silvered mirror" inside of the 8" OD tube vacuum envelope.
We really need something better to replace the access connector when we're at air. This tin foil tunnel crap is dumb. We can't do any locking in the evening after we've put on the light doors. We need something that we can put in place of the access connector that allows us access to the OMC and IOO tables, while still allowing IMC locking, and can be left in place at night.
It is in the shop. It will be ready for the next vent. Koji's dream comes through.
24" diameter clear acetate access connector is in place. The 0.01" thick plastic is wrapped around twice to insure air and bug tight barrier for the MC to lock overnight. The acetate transmission for 1064 nm is 90 % This was measured at 150 mW 2.5 mm beam size.
Aluminum sheet as shown will replace the acetate. Side entries for your arms and "window" on the top will be covered with acetate using double- sided removable-no residue tape 3M 9425
Tip Tilt pitch adjustment on existing-in vacuum suspension. This can be added by a simple installation of a 1.25" long 2-56 threaded rod with nuts.
[Koji, Steve, Den]
TT alignment is fine, yaw damping is satisfactory, pitch damping is slow. We might want to add magnets to the mirror and attach blades to the frame for pitch edge current damping.
We are moving towards electronics testing.
Atm1, TT 1.5" high adaptor base will be back from the shop in 10 days.
Atm2, There is no PITCH damping, YAW edie current damping works well at 0.5 mm gap
Atm3, Adjustable Al -disc that contains a small magnet is purely designed.
We have to come up with a solution to have damping in PITCH
We can only decide the need of pitch damping when the coils are activated.
VME crate blew its fuse and the fuse housing is hard to access.
Apparently all of the ION pump valves (VIPEE, VIPEV, VIPSV, VIPSE) opened, which vented the main volume up to 62 mTorr. All of the annulus valves (VAVSE, VAVSV, VAVBS, VAVEV, VAVEE) also appeared to be open. One of the roughing pumps was also turned on. Other stuff we didn't notice? Bad.
Several of the suspensions were kicked pretty hard (600+ mV on some sensors) as a result of this quick vent wind. All of the suspensions are damped now, so it doesn't look like we suffered any damage to suspensions.
CLOSE CALL on the vacuum system:
Jamie and I disabled V1, VM2 and VM3 gate valves by disconnecting their 120V solenoid actuator before the swap of the VME crate.
The vacuum controller unexpectedly lost control over the swap as Jamie described it. We were lucky not to do any damage! The ion pumps were cold and clean. We have not used them for years so their outgassing possibly accumulated to reach ~10-50 Torr
I disconnected_ immobilized and labelled the following 6 valves: the 4 large ion pump gate valves and VC1, VC2 of the cryo pump. Note: the valves on the cryo pump stayed closed. It is crucial that a warm cry pump is kept closed!
This will not allow the same thing to happen again and protect the IFO from warm cryo contamination.
The down side of this that the computer can not identify vacuum states any longer.
This vacuum system badly needs an upgrade. I will make a list.
Ayaka Shoda, visiting graduate student received basic 40m specific safety training today
ETMX optical table was left open. Burned toast award goes to ......?
PR1, PR2 and RP3 turned on for warming up for oil change. Oil changed with 3.2L of MVT-19 fluid in each. This substitute for HE-175 will be used at the next oil change - it has 1E-6 Torr vapor pressure.
To finish this job tomorrow: 1, check oil creeping upstream 2, change air filter of air purge if pressure drops <350 mTorr 3, measure venting time of pump
Pitch damping solution needed! It should be in the machine shop already.
We observed one or two ants climbing over PMC optics without booties and safety glasses.
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!
I purchased 3x 1/2" ccd cameras and 3x F 50 mm lenses for the lab.
The spectral sensitivity plot is for an older model 902H. This new model has better sensitivity
VENT NOW and FIX ALIGNMENT!
PSL shutter closed, manual block in place, HV turned off. P1 is at 200 Torr now. Jenne is taking over here.
Valves closed, 500 torr. Steve will finish off Monday morning, then we'll take off doors and get to work.
We are almost at atm. P1 750 Torr, We are slowly reaching equilibrium.
The access connector was removed, BS and ITMY chambers were opened yesterday.
New one piece aluminum shell access connector installed. Jenne lowered the PSL out put into MC to ~100mW
We should check that their sus wire diameter are 0.0017" All 2-56 hardware are in and Bob is cleaning them.
PR1, PR2 and RP3 turned on for warming up for oil change. Oil changed with 3.2L of MVT-19 fluid in each. This substitute for HE-175 will be used next time.
. Leybold D30A manual is here. Exhaust filter traps were drained. No oil creeping was found. The pump venting time is < 1 minute.
PR-2 needs new secu-valve. PR1 & 2 are in excellent condition.
While I was doing the oil change of the roughing pumps I accidentally touched the 24 V adjustment knob on the power supply.
All valve closed to default condition. I realized that the current indicator was red at 0.2A and the voltage fluctuated from 3-13V
Increased current limiter to 0.4A and set voltage to 24V I think this was the reason for the caos of valve switching during the VME swap.
The thinner wire has a history that it did not improve the hysteresis (ask Jenne). Nevertheless, it's worth to try.
If you flip the clamp upside-down, you can lift the clamping point up. This will make the gravity restoring torque stronger.
(i.e. Equivalent effect to increasing the mass)
Luckily (or unluckily) the clamp has no defined location for the wire as we have no wire fixture.
Therefore the clamp will grab the wire firmly even without milling.
The wire clamps should be taken off at the top and at the mirror holder. They need a mill touch up. It would be nice to have the centering jig from LLO for the 0.0017"
The clamps in this condition are really bad. It can sleep, it is not adjustable.
The second loop of the bungee cord should be on the top of the acrylic and still on the supporting aluminum tube as shown.
High particle count confirmed with #2 counter
Suprema- SS clear edge mirror mount 2" diameter is modified for 40m vacuum use. One left and one right handed one. It's adjustment screw housing is bronze! It is not ideal for out gassing.
It will be baked and scanned. If it passes we should use it.
We may need these to bring out some pick-off beams.
I vote against it. We don't know about the grease inside the screw bushings - scans are not everything if adjusting the screw loosens up the grease. If we need more pick off mirrors lets just make some of the kind that we already use inside for the 2" optics.
I think Steve had these prepared in response to my question a few days ago of how badly do we need adjustability for the POX/POY mirrors? We already have cleaned open-sided mounts that have no adjustment screws. So as long as the beam reflects off the ITMs horizontally (which it should), we can do yaw adjustment by twisting the whole mount. We don't need super fine yaw adjustment, we just need to get the beam out, so this is probably good enough.
We should put the POY mirror on this open-sided mount (the one without screws) some time. Perhaps even today.
The hex adjustment screw is removed from the brass bushing for degreasing, cleaning and baking. Newport says the bushing is is brass not bronze.
Brass outgassing rate is 10x higher than copper that is truth. The surface area is small so Krytox grease is ok if it is really needed in the 40m. ( It was ok in the past and it is still there )
I asked Jamie to read these docs so we can do some troubleshooting while at atmosphere. We have to have the all valve closed DEFAULT condition working-tested.
I'd like to reconnect all valves after this test so the state identification software could work, including interlocks.
Posted the following documents on 40m wiki.
PRM and SRM OSEM LL 1.5V are they misaligned?
The BS camber is open only. We should close ASAP
Outside air quality is 1.7- 2.2 million particles / cf min of 0.5 micron
Air is still bad and the chambers are closed. Before lunch Jamie repointed the PRM oplev. Manasa and I reset oplevs: BS and ITMX.
ETMX and ETMY are fine.
SRM and ITMY oplevs needs more work.
We have two ready for vacuum 1.5" mirror mounts with pico motors in our hands.
Canon EOS Rebel T3i has been purchased. See rating
Oplevs and IP ANG are still centered. Why do the SRM and PRM move 5X more ? I could not check the sensing voltages because the computer failed.
AS and REFL are looking the same as last night.
ALL LOOKING GOOD!
I'm looking for IOO steering mirror power supplies. I found two so far: one at 1Y3 as Kepco + 75V and one at OMC_North rack -150V
Are there any more? The OMC is off.
ANSWER: only one of the steering PZT can be driven, so see their power supplies
The pressure is CC1 3e-4 Torr at 8 hours of pumping. Status: vacuum normal
The IFO is ready for light
Charles Blakemore our new undergrad help received 40m specific safety training today.
New Lumitek IR Sensor Cards are here. We got 2 pieces of Q-11-T (2" x 2"), 2 pieces of Q-11-T (0.75" x 0.75") and one Q-11 (4" x 5")
Air conditioning maintenance is scheduled for tomorrow morning till noon.
It took 15 days to reach 1e-5 Torr
The RGA was turned on yesterday. The rga scan plotting was not working. Den wrote a Python script to log and plot because the Mathlab had trouble receiving data from our old c0raga.
It turned out that the Joe's log&plot system was working today. Thanks Den and Joe.
Here is the first rga scan.
Jeff is still working on the filter banks.
Spare optics from the AP table were moved to glass cabinet in the east arm. I'm not sure this is the right place. We'll see what everybody thinks.
There were two UNMARKED optics. Shame on you! No pencil marks on the optics either. These optics were shipped to the FBI for finger tip analysis.
Clean cabinet S15 doors were left open. You have to lock it up!
Aluminum foil replaced by sheet metal on Enclosure and AP table.
For those of you who like to do work on the interferometer without reporting it in the elog because you think that what you did doesn't affect anything, this is your example of how our time can be wasted by such laziness.
I'm taking full responsibility for this action and I told them after lunch Friday.
HOW NOT TO:
The BS isolation stack supported by two beam tubes and they can pivot around the pivot point.