Slow pumpdown of rebuilt IFO-mark4 started at 3pm today.
We are at 680Torr at this minute with 1.5 Torr/min speed.
We have reached 200 Torr at 12 hours of slow pumping speed. Kiwamu stopped the pumping for 11 hrs last night .and I restarted it this morning.
Now RV1 is fully open with butterfly valve in place and the second roughing pump RP3 was just turned on.
How to stop pumping:
1, close RV1 manual valve with torque wheel
2, close V3
3, turn off roughing pumps RP1 & RP3
4, disconnect metal hose connection to butterfly valve
The pump down continued this morning by the removal of the butterfly valve. Two roughing pumps were used to reach 500 mTorr
The Maglev monitoring MEDM screen "Rotating" indicator is not working. It is on all times. Please look at Maglev controller monitor for real information.
Pump down is completed.
Configuration: vacuum normal after 86 days at atm CC1 = 1e-5 Torr
IFO is hungry for light (and maybe some goulash with a little paprikash too)
The Watec 902, 1/2" CCD camera got new Tamron lens: 1/2" 10-40mm F/1.4 manual iris. IR corrective lens. It is designed to have the same focal point in the IR as
in the visible light range. However, as the depth of field in the IR range is very narrow, focus adjustment should be done carefully in the IR.
Now you can see the sus tower that will make alignment easier.
Joe updated the rga procedure in the wiki and we turned on the filament. It will take a few days to reach thermal equilibrium.
TP2 dry fore pump was replaced at 910mTorr
The crane people are here. The Vertex chambers are covered with plastic. The PSL HEPAs will be running on high during the day.
It is going to be disturbingly noisy and dirty during the day. Please try start working in the evening if it can not wait till next week.
The upgrade is almost finished. I found that the passive latch lock is not closing down all the way. It has about a 3/8" gap. See Atm. 1 & 2
The service man was here this morning and agreed to fix it. They will be back next week. The latch needs an other spring to push it into full lock.
We tested all possible sequences of operation of the new upgrade. It performed to specification.
I blocked the AP table's south west 10" ID port since it is obsolete with the new layout.
Reminder: items on the enclosure self can fall down in an earthquake. I moved oscilloscope and heavy calorimeter head from the edge of the cliff.
The air condition was off for the south arm. I turned it on.
The RGA scan is normal at day 52 of this pump down.
Light power BS 1064nm ~25mW, ETMX 532nm ~5mW
I set up video monitoring of MC1 and MC3
The #3 enclosure door was removed for the carpenter shop this morning. They will make 5 full size doors with window on each.
TEMPORARY aluminum sheet is clamped into its place. This sheet should not be removed till new doors arrive.
The inside Formica color will be changed from white to black to reduce the green scattering.
The south arm labels were changed from y to x to reflect reality.
So racks, manual disconnects and breakers now have their actual name. The east arm will be changed over tomorrow.
Please remove incorrect labels if you see any !
I can not find 1X4 breaker so it will be traced.
The mechanical assembly of RF distribution box is 99% complete. Some of the components may be bolted to the teflon base plate if needed.
All RF cables and DC voltage supply lines have been installed and tested. I removed the terminal block which was acting as a distribution box for the common zero voltage line. Instead I have used the threaded holes in the body of each voltage regulator. This allows us to keep the supply lines twisted right up to the regulator and keeps the wiring neater. The three regulator bodies have been wired together to provide a common zero potential point.
I did a preliminary test to see if everything is functioning. All units are functioning well. The output power levels may need to be adjusted by changing the attenuators.
The 2x frequency multiplier outputs are not neat sine waves. They seem to produce some harmonics, unlike the rest of the components.
I will post the measured power output at each point tomorrow. The RF power meter could not be found in the 40m lab. We suspect that it has found its way back to the PSL lab.
Frank is recommending these PhaseTrack-210 as phase stable low loss rf coax cables.
Larisa Thorne received 40m lab specific, basic safety training. She will attend P. King's Basic Laser Safety Training Session tomorrow.
Cheater cables for SRM sus tied up. They were dangling aimlessly on the floor.
Uniblitz mechanical shutter was placed into the beam path of the PSL output with razor beam trap. The output power was 1.39W at 2.08A
It is working from the MEDM screen "old map" C1IOO_Mech_Shutter.adl
The beam of IR for doubling is clipping on bnc cable to green beam transmitted pd.
I moved old POX shutter from ITMY optical table to the south end. MEDM POX mechanical shutter screen is now closing the green beam injection into the Y arm.
I kluged in a 40m long bnc cable that Alberto left on the floor for control. It is labelled POX-sht This is a temporary set up.
Ansell AccuTech 91-300 clean room gloves ONLY in the 40m lab.
Cleaning and preparation must be carried out in these gloves also.
We have one single O-ring on the 40m vacuum envelope. It is on the OOC west side, facing the AP table. This O-ring has to be protected from the force of this
door. There should be 3 shims ~120 degrees apart to carry the full load, so it is not the O-ring that is getting squashed.
This morning I found only one of these shims in place.
New Focus Servo Controller has just arrived. We have 25 days to evaluate this product.
It will have to be shipped back to the vendor on April 4, 2011 the latest in order to get full refund.
Bryan Barr is visiting us from Glasgow for a month. He received 40m specific safety training on Friday.
Solid door, numbered 4 at south west corner of PSL enclosure was replaced by laser protective window.
The carpenter shop's Mark is making 4 more identical ones for the east side.
The Lightwave NPRO126 of 700mW was moved from the AP-table into the PSL-enclosure temporarily.
It's emergency shutdown switch can be seen at the center bottom picture
The 40m lab was visited by ~ 30 LSC members the end of last week.
Suresh is captivating his audience with gravity waves on last Friday, March 25
I strain relieved RF cables labeled 33 MHZ LO and 166 MHZ to EOM at 1X2 This is a temporary setup for the 11 MHZ
The coax N bulkheads connectors are mounted on the plastic front panel now.
Mike Caton of Konecranes inspected and loadtested all 3 of the 40m cranes at max reach trolley positions with 1 ton.
Just for a record. We got 4 new laser pointers (2 greens, 1 blue, and 1 green and red combination). Don't lose them.
They reside in a bucket on the SP table, where IR viewers and sensor cards also reside.
Low power green-red laser pointers are in. High power green, red and blue pointers are confiscated.
The PSL enclosure now have 4 windows on each side. The bottom rail guides on the east side will be replaced by one U-channel for smoother, more gentle sliding.
Door position indicator- interlock switches are not wired yet.
Konecrane representative gave crane operator training in the 40m. Koji has become a qualified, trained crane operator of the 40m lab.
The east side window guides will be replaced by one long U-channel. There will be drilling into 2x2 steel frame. It should be done by 2pm today
This should remove the jerking motion of windows hitting the individual guides.
New right angle PVC, 2 x 2 x 1/4" installed at the AP table to strain relief the 1/4" spiral corrugated RF coaxes.
The anti aliasing box was opened up at the back to accommodate the junction board and the SCSI cable towards the ADC. Aluminum plate was attached to the bottom to hold the strain relief clamp.
Three more hanging junction cards will be replaced in this manner.
The installation went smoothly. There will be no more banging the doors into guides on the east side.
Atm2 showing the west side as is today
.....Happy.... Birthday.... to.... Joseph... and... Jamie...Happy....Birthday..... to.... You............sing with us........Happy Birthday.....to you
The returning spot diameter on the qpd ~10 mm. In order to reduce the spot size I moved the f 1145 mm lens toward the PRM ~ 25 cm. The spot size was reduced to ~8 mm, 3200 counts.
I'll try to find an other lens tomorrow.
The little red all terrain cargo wagon 40" x 18" has just arrived on pneumatic wheels.
Model #29, 200 lbs max load at 26 PSI, minimum age requirement 1.5 years
Atm 1, PRM oplev inward path with 2 lens solution: 14 cm gap between F 1145 and F 1545 mm lenses.
Atm 2, The PRM beam size 3 mm and the beam quality is still bad. The BS path only needed alignment.
Valera and I installed the the temp sensor and the interface box that Rana fixed. This may help with diagnosing the PSL drift.
I was wrong. Rana did not fix the interface box. I removed the interface box and turned down the HEPA flow from 100 to 20% on the Variac.
New right angle PVC front panel with SMA bulkhead connectors are in place. The connections are still lose. It is ready for Suresh to finalise his vision on it.
The emphasis of this annual safety audit was on safe electrical housekeeping on March 3, 2011
Dry fore pump of TP3 replaced by brand new Varian SH-110 at 1.1 Torr_75,208 hrs
The annuloses were closed off for 25 minutes. We are back to VACUUM NORMAL mode.
The TP3 fore line pressure dropped to 44 mTorr at 25 minutes in operation.......9.4mTorr at day 2 with full annulos load
The SRM qpd cable was removed from the BS-table. It's path was changed from 1x4 to ITMY-table following the inner cable tray.
Valera and I placed F 572.7 mm lens ~15 cm away from the ang qpd (in the same mount with ND filter) so that two qpds see different combination of ang and pos motion - there was no lenses prior to this change. The beam diameter is reduced to ~half .
I found that a He-Ne laser which has been used for ETMX_OPLEV was NOT giving the light.
Since I didn't find the switch key for it I have no idea if the laser is simply off or dead.
The dead laser was replaced by new JDSU 1103P of 2.6mW. The return beam is big ~5 mm diameter of 0.3 mW, 1400 counts
Laser diode oplev SRM is working. Qpd matrix values were reset like others.
In 0.44mW, returning 0.1mW, -500 counts.
Aux- rack _1Y2 is just behind 1Y3 It contains Kepco Analoge DC power supplies for +- 5, 15 and 24V
Placing these power supplies away from the LSC rack was an effort to minimize pick up from them.
A cable for IP_POS has been disconnected at the LSC rack, 1Y2. Due to it currently no IP_POS signal shows up on the digital side.
It looks like we disconnected the cable together with some unused cables when we were cleaning up the wiring of the LSC rack.
The cable, a shielded flat-cable, is supposed to send DC power to the QPD and send the signals from the QPD to an interface board on the LSC rack.
I will check how it used to be and reconnect it.
I found the disconnected cable, but I do not see the interface board at the LSC rack