As we learned yesterday, the PSL laser power out put mechanical shutter is not working in the remote mode. It only works in local manual mode.
Do not rely on the MEDM screen monitor readout! The position is only changing on the monitor. The main beam must be blocked before the output periscope.
Ben found the Sorenson 5V ps off. It was turned off since our last scheduled power outage. I wonder what else is running on 5V in the PSL? This power supply should be on the
"alarm handler" list to avoid future repeat of this condition. However a real safety switch would have confirming position sensors of the shutter open or closed. Is there such thing at the sites?
[Jenne, Kiwamu, and Steve via phone]
Around 9:30pm, Kiwamu and I came back from dinner, and were getting ready to begin the beam scan measurements. I noticed that one of the vacuum pumps was being very loud. Kiwamu noted that it is the fore pump for TP3's turbo, which he and Steve replaced in January (elog 2538). We had not noticed these noises before leaving for dinner, around 8pm.
We called Steve at home, and he could hear the noise through the phone. He said that even though it was really loud, since it was reading 3.3mTorr (on the display of the controller, in the vacuum rack just above head-height) which is close to the nominal value, it should be fine to leave. He will check it out in the morning. If it had been reading at or above ~1Torr, that's indicative of it being really bad, and we would have needed to shut it off.
For future reference, in case we need to turn it off, Steve said to use the following procedure:
1. Close VM3, to isolate the RGA, which is what this pump is currently (while we're at atmosphere) pumping on. I don't know if there are other things which would need to be shut at this stage, if we were at vacuum nominal.
2. Close VM5, which is right in front of TP3, so TP3's pump is just pumping on itself.
3. Push the "Stop" button on the Turbo controller for TP3, in the vacuum rack, about waist level. Turning off the turbo will also turn off the fore pump.
UPDATE, 1am: The controller in the rack is reading 3.1mTorr, so the pump, while still noisy, still seems to be working.
The foreline pressure of TP3 is 2.9 mTorr The drypump is loosing it's bearing and it is very noisy.
V3, V5 closed and TP3 small turbo controller off. This turned off the noisy forepump that has to be replaced.
RGA is running at cc4 2e-6 Torr
The RGA was turned off at cc4 1e-5 Torr
Bob replaced the tipseal in an other drypump and I swapped it in. TP3 turbo is running again, it's foreline pressure is 40 mTorr. The RGA is still off
IFO room temp 27.5C , Please remember to turn AC back on !
Valera and I put the 2 Guralps and the Ranger onto the big granite slab and then put the new big yellow foam box on top of it.
There is a problem with the setup. I believe that the lead balls under the slab are not sitting right. We need to cut out the tile so the thing sits directly on some steel inserts.
You can see from the dataviewer trend that the horizontal directions got a lot noisier as soon as we put the things on the slab.
The tiles were cut out in 1.5" ID circle to insure that the 7/16" OD lead balls would not touch the tiles on Wednesday, May 26, 2010
Granite surface plate specifications: grade B, 18" x 24" x 3" , 139 lbs
These balls and granite plate were removed by Rana in entry log #3018 at 5-31-2010
This box was made to provide good thermal stability for seismometer calibration. There is an inner solid shell of 0.064" Al box that is covered by 2" insulation
inside and outside. The polystyrene foam is "CertiFoam 25 SE " from McMasterCarr #9255K3.
Is the cooling line clogged? The chiller temp is 21C See 1 and 20 days plots
Steve for Nancy,
Seismometer interface box ac power was turned off, Guralps disconnected and moved. Ranger locked, moved and released. Nancy will describe the rest soon.
The flattened lead balls were checked for their heights by the calliper, and were all in the range of 9.50 to 9.70 mm.
The rechecking was done by using these balls between two aluminium plates and checking their levelling. When confirmed this, we proceeded to install the balls(no more balls :P ) in their place.
The Guralps were switched off by switching off the power supply to them. The ranger mass was clamped in order to be able to move it. This can be undone by rotating the transport screw counter-clockwise.
We installed the flattened lead ballsin the space made for them. The granite was then placed on it with the help of many other people in the lab. It was lowered by hanging it on two straps held by people , and then placed in the space marked for it.
Did we then turn on the seismometers? Did we release the locking screw on the Ranger? What happened to Bat-Boy??? Since they make a good mystery I will choose to leave them out of my elog entry.
Nancy and Sharmila received introductory early bird surf safety training for the 40m lab.
The laser chiller temp is fluctuating and the power output is decreasing. See 120 days plot.
Yesterday I removed ~300cc water from the overflowing chiller tank.
I found the laser dead this morning.
The crane people are here to unjam it.
Laser hazard mode is lifted and LASER SAFE MODE is in place. No safety glasses but CRANE HAZARD is still active.
Stay out of the 40m lab !
40m SURFs Razib Obaid, Nancy Aggarwal, Unknown Bearded SMURF, Megan Daily, Gopal Nataraj, Katharine Larson and Sharmila Dhevi received 40m specific safety training on June 23, 2010.
Slow pump down _pd68 has reached the vacuum normal state. CC4_Rga region is pumped now. The RGA is still off.
Precondition to this pump down: 129 days at atm, ITMs replaced. MMT, oplev and other components were removed from BSC, ITMCs. New MMT mirrors are in. IOO_access_connector was out. The end chambers were not opened.
The AC filters will be checked and/or replaced today. This means the AC will be off for sort periods of time. Temperature and particle count will be effected some what.
See 800 days plot
I have just removed an other 400 cc of water from the chiller. I have been doing this since the HTEMP started fluctuating.
The Neslab bath temp is 20.7C, control room temp 71F
The PSL shutter was closed. The beam path blocked two places. High voltage power supplies to IOO and OMC PZT were checked to be off. Oplevs are off.
The south arm green cavity was misaligned yesterday
We would like to keep the vent speed at 1 torr / min. I'm venting with N2 now up to 25 PSI. We have 3 cylinder of instrument grade air inside the lab. Additional supply will arrive later. It can be as late as 1pm
The vent has been finished successfully in this morning.
The vent was finished successfully this morning.
Thanks to Kiwamu, Alberto and Koji
The ref cavity ion pump was running at 7.7kV instead of 5kV
This Digitel SPC-1 20 l/s ion pump should be running at 5kV
The control room temp is warmer than usual. The heat exchanger Office Pro 18 set point was lowered from 70 to 68F yesterday.
The MOPA headtemp is higher also. The Neslab chiller bath temp peaks around 21.6 C daily. This should be rock solid 20.00 C
It did not have any effect.
Now, I have just lowered the thermostat setting of room 101 from 73 to71F I hope Koji can take this.
All 3 cranes will be load tested at 1 ton tomorrow morning between 9am and 2pm
Do not come to the 40m lab during this period. We may disturb your experiment.
Please prepare your touchy set ups to take this test.
Little change in the AC set temp can make wonders. Neslab chiller bath temp 19.99C is back to normal and daily variation of PSL are much better.
The lab is at 30,000 and Pasadena air is at 1.1 e+6 particles /cf min of 0.5 micron.
Head count at the evacuation drill today. I checked alarms and flashers at room 104,102,101, 103, 105 and 107. They were really loud and bright.
Bob and Steve closed BS chamber with the help of the manual Genie lift and the pump down started. The PSL shutter was closed and manual block was placed in the beam path. High voltage power supplies were checked to be off.
Pumping speed ~ 1 Torr/min was achieved at 1/8 of a turn opened roughing valve RV1
29 Thu BS chamber work: Move cable towers / green steering mirrors / (2 TTs with TT charactrization) / Put the heavy door by 5PM.
30 Fri Pumping down
31 Sat WFS work by Nancy
1 Sun - 5 Thu WFS work by Nancy
5 Thu PSL Table prep
6 Fri PSL Table prep / Likely to shut down the PSL
9 Mon PSL Table prep / shutting down of the PSL (optional)
10 Tue PSL box Frame lifting
12 Thu PSL table tapping
16 Mon - 17 Tue concrete pouring preparation
19 Thu - 23 Fri Tripod placement
24 Tue - 26 Thu concrete pouring
The PSL table height will be raised to the level of the AP table. This will be done using 6 TMC's Rigid Damped Tripod legs. Their planed positions shown below.
The legs will be grouted to the floor with concrete.
We are at 370 Torr at 9 hrs of pumping. RV1 is opened to ~ 3/8 turn orifice. We are using one roughing pump RP3 and butterfly valve is in place.
How to stop: 1, close RV1 by torque wheel 2, close V3 from MEDM screen 3, turn off RP3 roughing from MEDM screen 4, disconnect metal hose to oily pump
after butterfly valve. This KF-45 O-ring seal should be kept clean 5, place/close 45 mm cover blanks at the end of the hose and and on the 5" nipple.
How to start: 1, remove blanks from hose and nipple 2, reconnect roughing pump hose to RV1 nipple 3, turn on PR3 4, open V3 5, open RV1 by wrench to ~3/8
6, fine tune RV1 opening to 1 Torr/min
ESSENTIAL: one operator has to be present when oilly roughing pump is connected to the vac. envelope
3 days pump down #69 completed. Thanks to Koji and Kiwamu who did more roughing on Saturday and Sunday.
PSL preparation work
Aug 5th 10am-4pm?: (Kiwamu, Alberto, Koji)
Aug 6th 10am-4pm?: (Kiwamu (ex. noon-2pm), Alberto, Koji, Jenne ('till noon) )
Aug 9th 9am-5pm: (Steve, Jenne, Alberto, Koji)
Monday, August 9
We should move the reference cavity too. Will this cavity be pumped while relocated?
Check and insure that attached and cut-free cables of PSL have enough room to tolerate the raising of the enclosure by 6"
I had second thoughts about the power line to the OMC. Koji was right, we should disconnect them from the power supplies.
The PSL enclosure doors on the north side will have to be removed some times to move exiting and entering ports.
Mike Gerfen, Koji and Steve,
Our old ( 6 x 10 x 1 ) ft Newport optical table will have the same height as the neighboring AP table when this job is finished.
Today's work was to elevate the optical table ~ 2400 lbs to 30" clearance to create a workable space below.
Atm1, enclosure frame was raised by 6"
Atm2, 2 pellet jacks and 4x4 technology in the work.
Atm3, ready for drill and tap with jig plate in place, note 4 Al legs 8" OD. 1/4" wall safely supporting the load
Atm4, showing clamps that holding 1/2" plywood with jigs
Atm5, We removed the 4 old legs: 6" OD steel, 1/4" wall and 10" high after they were unloaded.
I powered down 1Y1 and 1Y2 instrument racks of MC and RF-systems this morning.
Both racks, SP table, clean tools-parts boxes and MC2 area are also covered with plastics.
Bertin Bros. Construction, Inc is working on the floor preparation. Their head man is Robby Bertin, cell 626. 831.2264
remove tiles, clean off tile glue, drill for ribbed steel bars, rough clean- surface for good bounding. paint floor with bounding agent
Tiles and adhesive removed. There were no dust storms created. Solvent paint- removal made the hole IFO -lab smell like the paint shop.
The south door is open with a fan blowing air inside. The north-west door is open through control room to outside to let air rinse the drying
paint-removal. Koji is taking lunch break while test riding our new PSL table legs.
Koji, Rana and Steve
The floor preparation continued today. The really messy part of drilling and jack-hammering the concrete were done in controlled manner.
Particle counts peaked at 106K of 0.3 micron and 13 K of 1.0 micron particles/ cfmin at the top of SP table.
Legs were installed with the help of Koji and strongman Rana. Professor Rana was very useful lifting the 85 lbs legs.
Atm1, Drilling holes for ribbed bar reinforcement of concrete
Atm2, Koji and Rana are playing hide and seek while installing legs
Atm3-4, 6 Rigid tripod legs attached by 6x3 of 1/4-20x 7/8 screws. The top plates of the legs were torqued to 108 ft/lbs by Rana
Tuesday, 17 August : fill tunnel, set table height, level table and balance load
Wednesday : grout tripod legs and leave it alone
Thursday : built guide-form for concrete
Friday : pour concrete
Monday, 23 August : remove guide forms and clean up
Rana, Koji, Alberto and Steve, Tuesday afternoon
Atm3, Part of the tunnel under the table was filled with quick drying concrete this morning to give solid support for tripod legs.
PVC tube 6 " ID with TEE will able us to connect AP table, PSL table and Control room if needed
Atm4, Table height set to equal AP at ~32.75 " on copper plates using 5/8-11 x 4.5" set screw-bolt in tripod foot
Rough leveling was done by 4 individual levels at the four corners with 9" long Stanley cast aluminum levels.
Load balancing of the total weight ~ 3000 lbs over 6 legs x3 = ~170 lbs on each jack screw with Snap-On torque wrench at 140 lbs/ft
Atm1, Three crew members at work. Prof. Rana's calibrated right hand was used at jack screws where insufficient space was available for socket head wrench.
Atm2, Table is ready for no shrink grouting now.
The 10' x 6' optical table is seating on 6 tripods. Each tripod leg has 3 feet. They are supported by jack screws against copper plates on the concrete floor. These set screws allowed us to set the height, level and distribute the load of the table.
To lock this position of the table grouting is used around the jack screws and between the concrete floor and the tripod feet.
Once the grout set the load will be carried by the hole feet of 4" x 3.25" x3 = 39 sq inches per tripod leg
These ~4" thick grouted islands of 8-9" OD will be covered by 4" concrete. The area between the legs will be filled with 8" thick concrete.
Cement based grout, early height change 0 - 4%, hardened height change 0 - 0.3%
Atm2-3, pouring grout
Atm4, south west leg is done
Tomorrow: setting up ribbed bars, building frame to hold concrete and pour concrete
The preparation for pouring concrete is continuing. The grout forms were removed. Half inch ribbed steel bars were epoxied into our 4" thick floor.
The concrete holding sides- forms are cut to size. They will be installed on Monday morning and pouring concrete should follow.
We can be planning for cleaning up on Tuesday
Atm1, epoxy used bars
Atm2, south west tripod feet grouted
Atm3, ribbed bars are getting ready
C1: PEM-count channels are dead since August 12, 2010
Bertine Robby, Bertin and Jerry completed the installation by pouring concrete yesterday and cleaning up today.
Atm1-2, steel bars, grouted feet and side forms are ready
Atm3, bounding agent is applied for better bounding
Atm4, pumping concrete
Atm5, shaker is used to fill-all
Atm6, late after noon the forms- sides were removed, NOTE: actual table to concrete distance is 12.75"
Atm7, construction people left and the tile man is on the way
The tile patching should complete today so tomorrow we can remove plastic covers.
The tile work was done yesterday after noon.
This morning Mike Gerfen and me lowered the enclosure frame to normal height.
Keven- janitor and I removed plastic covers from chambers, racks, SP, MC2 and clean tool boxes.
The afternoon Jenne, Kiwamu, Joe and Aiden cleaned the enclosure inside out. The particle count measured zero inside the enclosure with HEPAs on when the covers were
removed. The MOPA and all other components were happy to see us in excellent condition.
This table height is very user friendly!
Safety grounds were reconnected.
Atm1, new tiles around the concrete slab
Atm2, frame lowered with low cross bars reinstalled
Atm3, the enclosure frame's north west foot is connected to ground
Atm4, PSL optical table is connected to ground at the north east corner through 1 Mohm
Atm5, PSL optical table level at a stimulating, back-friendly height
I posted the crane safety document on the 40m wiki, vacuum page as 26 August 2010
Please add your comments and corrections.
The South End Crane will be balanced on Tuesday, 31 August 2010
This will mean that the back door of the south arm will be open on and off. Air quality will bad.
Please plan accordingly.
The PSL -leg concrete was sealed with a single coat of SCOFIELD Cureseal-S to minimize shedding of particles.
The optical table was covered and optics were removed from the shelf. Accelerometers were turned off.
I lowered room 101 thermostat setting from 74F to 72F
Our toilets were replaced by a green Gerber 1.6 gpf ( 6 lpf ) last week.
Crane balancing at the south end is continuing today.
The crane I -beam now leveled at all degrees of rotation. The lower hinge was moved southward about 1/4 of an inch. Performance was tested at 2000 lbs
Atm1, work in progress
Atm2, load test at 1 Ton
Atm3, service report
I hooked up interlock to the Innolight 2W 1064 nm in the enclosure. The manual shutter is closed on this unit.
SAFETY GLASSES REQUIRED !
I played with the particle counter this morning. Now it's running and reading the correct numbers on the old COCHECKLIST.adl medm screen.
However, it can not be seen with dataviewer.
Koji just rebooted the frame builder and the problem was solved.
Innolight 2W 1064nm main laser was turned off for more enclosure related work.
The electrician re rooting the power- conduit to the interlock under the floor and bring it through the new concrete tunnel.
Emergency laser power shut off switch was tested at entry door 104M. It worked fine.
No laser glasses required. Laser will be turned back on around 11 am today.