Steve pointed out that in the aftermath of the Nitrogen running out a couple of times last week, the RGA had shut itself off thinking that there was a leak and so it was not performing the scheduled scans once a day. So the data files from the scheduled scans were empty in the /opt/rtcds/caltech/c1/scripts/RGA/logs directory. The wiki page for getting it up and running again is up-to-date, but the script RGAset.py did not exist on the c0rga machine, which the RGA is communicating with via serial port. I copied over the script RGAset.py from rossa to c0rga and ran the script on that machine - but the error flags it returned were not all 0 (indicating some error according to the manual) - so I edited the script to send just the initialize command ('IN0') and commented out the other commands, after which I got error flags which were all 0. After this, I ran a manual scan using 'RGAlogger.py', and it appears that the RGA is now able to take scans again - I'm attaching a plot of the scan results. We've saved this scan as a reference to compare against after a few days.
Our last RGA scan is from February 14, 2016 We had a power outage on the 15th
Gautom has not succeded reseting it. The old c0rga computer looks dead. Q may resurrect it, if he can?
Dan sealed the leak today.
Earth quake stops need viton tips.
Wirestandoffs are still aluminum.
Gautom is progressing with the layout nicely. The X-arm transmission window have not seen cleaning for decades. This should be the time to do it. Here is picture of dirtiness.
It is not that simple... How much effort should we put in it? The hole table with 1W inno laser plus... set up now about ~500 lbs We can pull it off carefully, but it is not risk free.
We should look at our other signal port windows! Gautom's long reach able him to do the first contact cleaning without moving anything. It is great!
The anti-symmetric port
spider webs fly in the wind
It looks very promising.
Building: Campus (see attached Map)
Date: Manhole 1 - May 3 through May 5
Manhole 2 – May 6 through May 10
Manhole 2 - May 16 through May 19
Manhole 3 – May 11 through May 19
Time: Noise: 7:00 a.m. To 5:00 p.m.
Access: 24 Hours a day
Interruption: Noise/Vehicular & Pedestrian Access
Storm Drain Manholes
*In order to repair 3 manholes associated with a large storm drain that runs north-south through the campus, work will take place at the
3 manholes shown on the map. This work will interrupt vehicular and pedestrian access on the paths adjacent to the manholes. Though the work at Manholes 1 and 2 will allow vehicular and pedestrian access around the manholes, the work at Manhole 3 will completely block the driveway running south from the southeast corner of Parking Lot 11. Noise will also be created by the repair
3-4 hrs ago we run out of nitrogen. We are back to Vacuum Normal
We have good RGA scan now. There was no scan for 3 months.
Local EQ 3.5 mag at 2:28 UTC May 24, 2016 Rancho Cucamonga, Ca.....no damage
Hello, I am Varun Kelkar. I will be working at the 40m lab as a SURF student this summer with Eric Quintero on Audio processing for real time control system signals. This week I will mostly be working on implementing basic DSP C-code offline. Currently I am trying to write a code for noise whitening.
Varun has received 40m specific basic safety training today.
Please do not place anything on the top of the cabinets that is not tied down. It will end up on our head in an earth quake.
Machined from I-beam 6061 T6 Aluminum 5" x 0.5 x 3.25
As we realized during the EX table switch, the transmitted beam height from the arm is not exactly 4" relative to the endtable, it is more like 4.75" at the X-end (yet to be investigated at the Y-end). As a result, the present configuration involves the steering optics immediately before the Oplev and TransMon QPDs sending the beam downwards at about 5 degrees. Although this isn't an extremely large angle, we would like to have things more level. For this purpose, Steve has ordered some Aluminium I-beams (1/2 " thick) which we can cut to size as we require. The idea is to have the QPD enclosures mounted on these beams and then clamped to the table. One concern was electrical isolation - but Steve thinks Delrin washers between the QPD enclosure and the mount will suffice. We will move ahead with getting these machined once I investigate the situation at the Y end as well.. The I beams should be here sometime next week...
Atm2, version 2 "pdstand" will allow you to clamp from any direction ( Koji was right )
There are some issues with 5 mm sapphire prism Atm5. It will cause interference between one of the prisms and the Side OSEM.
Here are some drawings to see the issues with larger wire standoff.
The 2 mm prism will work.with a 1 mm longer dumbell.
Quotes requested from http://photomachining.com/laser-micromachining-photomachining-contact.html and http://www.optocity.com/
Local EQ 3.1 mag at Jun 2, 2016 11:06:16 PM UTC, Muscoy CA........no damage
Our STS should seen this shake.
Aakash Patil received 40m specific basic safety training.
EQ 5.2 mag at Jun 10, 8:04 am UTC, Borego Spring, CA ~150 mi away.........no obvoius damage, damping restored, MC is locking, arms are flashing
The PMC transmission slow degration or it's input beam is not stable.
ETMX has been jumping around again lately. Just now, I zeroed the ETMX alignment offsets in the SUS model, and centered the ETMX oplev spot via slow machine sliders. OSEM damping is on, oplev damping is off. Let's see how it moves around in the next day or so.
UTC: Jun 10 2016 23:18:26
The drill room floor will be retiled Thursday, June 16. Temporary nitrogen line set up will allow emptying the hole area.
Ifo room entry will be through control room.
Visual inspection of rooftop GPS antennae:
The 2 GPS antennas are located on the north west corner of CES roof. Their condition looks well weathered. I'd be surprised if they work.
The BNC connector of the 1553 head is inside of the conduit so it is more likely to have a better connection than the other one.
I have not had a chance to look into the "GPS Time Server" unit.
PSL, BS, ITMY and ETMX the illuminators were left on over night.
(on tower )
buy Ni coated ones for future use from www.electroenergy.com
Ok for larger RUBY,
unit is not in perfect condtition but usefull
Pick up FC from Gary with purchasing date 7-7-2015
NOT finished, last edited 7-7
Good job Johannes and Subham.
No suspention lost damping.
I called https://www.endruntechnologies.com/pdf/USM3014-0000-000.pdf and they said it's very likely just needs a software update. They will email Jamie the details.
The GPS receiver (EndRun Technologies box in 1Y5? (rack closest to door)) seems to not coming back up properly after the reboot. The front pannel says that it's "LKD", but the "sync" LED is flashing instead of solid, and the time of year displayed on the front panel is showing day 6. The fb1 symmetricom driver and VME timing module are still both seeing day 299, though. So something may definitely be screwy with the GPS receiver.
I wiped down the cranes with wet towel and Mario our janitor did the chamber tops with the tubes.
The optical tabels were not touched.
The outside temp peaked at 44 C yesterday
The fire alarm came on around 15:05 for about 2-3 minutes. We all left the lab and counted heads. I called Paul Mackel x2646 (cell 626/ 890- 3259) at Fire Protection Services. He said that this alarm test was planned and we should of got an email notice. Perhaps I missed that notes.
Fire alarm went off several minutes ago. Talked to security and they said there was no fire. It beeped twice again just now. No one has been working on the IFO today.
I got some QPR Nitrile gloves. They are LIGO approved.White nitrile gloves are naturally anti-static- 109 ohms
Their touch not as good as laytex gloves but try to use them.
Given the effect on the contrast defect, the consensus at the meeting Wednesday 6-22 was that we should continue to use the existing ETMX optic.
NOT finished, last edited 6-28
We'll follow LIGO policy:
Our policy is to use first contact within 1 year of purchase for use in the interferometers. For inspection use I am comfortable with out-of-date use.
GaryLinn offered their indate First Contact for use.
Hi Steve -
I found the doc I was looking for:
Specifically, you might find guidance in Section 5 and the pictures at the end of the doc. This should work for Vacseal as well.
Good luck - it will take some time (hours to day or 2)...
I'll be interested to know how it goes.
GariLynn helped us develop this procedure so you could also ask her to cast an eye over the setup if you are worried.
ps: there is no existing fixture to hold SOS optic while soaking it
Praful Vasiceddy received 40m specific basic safety training.
In the attached photo from 2012, one can see the installed black glass baffle. According to the drawings (LIGO-DNNNXXX) this one has a clear aperture of 40 mm.
In (someplace ?) we have clean baffles with a 50 mm aperture which can be installed during this vent. In order to be more conservative, let us choose to swap these out for all 4 test masses during the upcoming vent using the green laser as an alignment guide, as Koji described at today's lunch meeting.
They are located at the top of E1 drawer cabinet
Proposed Acetone soak dish for SOS epoxy softening.
It has good acces through 5" top ID. The set up is stable and teflon lined.
Materials: glass jar with SS cover, teflon bricks, 0.008" teflon wrapped "high density Drever bricks" and aluminum
Drever brick: I beleive it is a Tungsten alloy. We used it as vac-bat savor at the coffe can. It has high density, heavy and hard, it was never identified.
I will soak one brick to see if it has any reaction ability with acetone.
NO means that only Glass and Teflon can be used for this fixture in Acetone. We can not take a chance on the coating!
I guess the small surface area Aluminum dumbbell, guide rod and-or wire standoff, magnet and epoxy does not degrade the acetone such way that it effects our coating.
Not ot mention, that only the very edge of the coating would in this solution.
1, Fix ETMX sus "jump issue"
2, First Contact clean the arms
3, Install new spare cold cathode and convectron gauges: InstruTech-Hornet
4, Install 50 mm apeture beam baffles
5, Check and clean optical quality viewport from inside
The following bullets were executed:
Check crane functionality & cleanliness last week
We are venting the 40m IFO
Steve has ordered some teflon parts to take the place of the metal parts in his acetone-soaking jig. They should arrive tomorrow.
So, we will be begin the venting process tomorrow. Doors to come off on Tuesday.
I just disconnected the 6th instrument grade air cylinder from the vacuum envelope at 720 Torr. Now it will reach equilibrium through a filter as it sucks in lab air.
This is the sure way not to over pressurize the chamber.
Glass soaking dish with teflon guides.
The last RGA scan of this pumpdown 78
Pressure plot of 640 days long pd 78
CC1 cold cathode gauge was jump started with an accidental pressure glitch, that you can see on P1 plot
Yesterday Q noticed that PRM_sensor_LR was 0.098V This actually went to ~ zero on 7-3
Vacuum Status: Chamber Open
All chamber annuloses are vented. Vac Monitor screen is not communicating with gauges. The valve position indicator are working.
RGA is pumped by Maglev through VM2
Atm 1, It's right arm is perfect.
Atm 3-4, The left one has bended (dropped) end.
Atm 2, Our ruby wire stanoffs will fit the jig. Ruby OD 1.27 mm vs. old Aluminum OD 1.0 mm. Length ruby 6.4 mm vs Al 4.8 mm
Atm 5, The fixture translation stages are a bit loooose. Careful use of the micrometer is needed to be precise
Betsy agreed that the 40m will keep SOS fixtures.
Our new graduate student Lydia received 40m specific safety training.
I set up a simple HEPA filter dryer to dry your clean room garment before you can put it away into your storage box.
Our lab is dusty ! This is specially important when we are vented. Please wipe things daily and cover item with foils .... etc.
RGA background scan
Cheater cable to be used in clean room pitch gluing alingment.
Satelite amp needs to be there.
Atm 2-3, The ETMs suspension damping cable are connected at the end racks. All others go to 1X5
Atm 4-5, The other end of this cable in the high cable tray at 1X3 as shown. We'll disconnect the shorty and move the end to ETMX ( or any sus at 1X5 )
The heat drives the ants to the lab! Make sure the light doors are tight on the chambers.
ITMY side : Magnet od 1.9 mm so wire to magnet gap ~ 0.2-0.3 mm
Thanks for checking this out Koji
The builder in 1996 was Process System International, Inc ( Westborough, MA ) It does not exist any longer or I just could not find them. Flow diagramm at Atm1
Should I be keep looking for a company who could quote us for building a similar smaller unit with 10 - 15 cfm flowrate?
Note: my intension with the two mobile-overhead HEPA filter was the same as John Worden's " clean air overpressured tent " at chamber entrance.
Atm2, Our unit has 650 cfm, velocity 90 fpm at resistance 0.5" It may be enough to give a little overpressure if we seal it well to the chamber
We use to use them to minimize dirt getting inside the chanbers.