I test drove ETMY biases.
PITCH worked well in slow and fast modes. Slow drive was from the IFO alignment screen C1:SUS-ETMY_PIT_COM and
the fast one from C1:SUS-ETMY_ASCPIT_OFFSET
YAW did not. It was always diagonal. It was specially bad with the fast drive. I compared them with ETMX. ETMX yaw is diagonal a little bit too.
The OPLEV return spots on the qpd ETMX and ETMY are big 5-6 mm diameter. The ETMY spot has weird geometry to qpd.
80 days: PMC is drifting
We have cleaned, baked, rga scaned traps for vacuum. Thorlabs LB1 on 1" OD ss posts and forks. The effective surface area is 43 x 18 mm of stacked razors.
Seven pieces are mounted on New Focus #9962 1" OD SS vented- pedestrals to 5.5" center height and 5 pieces to 4.875"
Our surf student Manuel Marchiò received 40m specific safety training today.
OSEM damping gains were adjusted by observing real time dataviewer to get Q of 5
OSEMs were kicked up one by one with 200 counts ~1sec. The error signal was optimized to get 1/2 of exitation amplitude at the 5th sinusoid wave.
C1: SUS-ITMX_SUSPOS_N1 gain 111 -> 65, PIT 7.2 -> 8, YAW 12 -> 6, SIDE 280
ITMY 277 -> 120, 19.2 -> 7, 24 -> 19, 420 -> 470
ETMY 10 -> 32, 20 -> 3, 20 -> 10, 50
ETMX 22 -> 25, 3, 3, -170
ETMX having problems: 1, YAW can not be excited
2, SIDE has no error signal in dataviewer. Sensing voltage on MEDM screen 0.142V
Jamei fixed the computer. Now I had a healthier ETMX with SIDE signal that allowed me to set gains to get Q of 5
The Y arm restore locked the arm at TRY -out 2.4V, the X arm still did not lock or align to lock. It has some fringes.
ETMX POS gain 22 -> 17, PIT 3 -> 1, YAW 3, SIDE -170 -> -110
PRM 50 -> 30, 1, 2, 50
SRM 55 -> 20, 2.4 -> 1.5, 4.8 -> 2, 140 -> 100
Now all SUS OSEM gains are set
Both arms locked easely around 1V transmited. We should recenter oplevs.
Kiwamu, Koji and Steve,
Arm aligned separatly and oplev qpds were centered including BS. Than we realigned manually DRM and centered their qpds.
ALL SUS oplevs were centered to resonating cavities.
SUS-ETMY_QPD is not responding. It is reading zero in dataviewer and 4,400 counts on QPD MEDM screen.......must be wrong cable connected
IP-POS is sick. Last time alive 7-19-2011
IP-ANG beam is clipping on pick-up mirror at ETMY chamber. This will have to be fixed at the vent. The qpd itself is responding to light.
The vacuum system is coming up to atm. The vent was started with slow N2 flow. The PSL output is blocked 2 places on the table.
ITMX watchdog tripped around 5 Torr and the PRM around 450 Torr of this vent. They were restored than.
We are at 580 Torr now.
P1 at 750 Torr, Vent valve VV1 is left open to atm. It will reach equilibrium in an hour. The PSL power is not turned down yet. The beam path is blocked at two places inside the enclosure.
The low power 20 mW input MC can be locked tonight.
Next day's - Thursday notes:
We reached 760 Torr of atm in 8 hrs at 1.7 Torr/ min with 5 cylinders of instrument grade air.
Used 500 PSI of nitrogen to get to 20 Torr at first. This flow and the first cylinder of N2 has to be slower next time.
We did the following:
1, oplevs were centered on locked caveties 2 days ago
2, just before vent we rechecked arms pointing, they wre still locking
3,eloged strain gages and turned HVs off at PZT-steering at 1Y3 rack and OMC-PZT ps at 1X2 aux rack. They were actually off.
4,,checked jam nuts 6 places x 3
5, turned oplev servos off
6, eloged SUS summery page
7, checked particle counts at ITMY: 1 micron 300, 0.5 micron 3K, 0.3 micron 30K particles / cft-min. All three cranes were wiped 2 days ago.
8, blocked laser into IFO: main 1064 in 1.25W were blocked by manual 2 blocks on PSL table. The PSL output shutter was left open to be triggered by interlock at P1 3 mTorr. It did!
Aux NPRO-AP and green light input at both ends were blocked.
ITMX and PRM moved alot. BS and ITMY just a little based on oplev reference.
We need a plan how to minimize cross coupling in the OSEMs now
The horizontal trolley drive stopped working at the east end this morning. It is working intermittently. In the worst case we can take the door off with the manual -Genie- lift.
I'm working with Konecrane to solve the wormgear drive problem.
Just a reminder that a film crew will be here Monday morning, filming Christian Ott for some Discovery channel show.
They are slated to be here from 8am to 12:30pm or so. They will take a couple of shots inside the lab, and the rest of the filming should be of Christian in the control room (which they will "clean up" and fit with "sexy lighting"). I will try to be here the whole time to oversee everything.
Konecrane Fred was early this morning. He diagnosed the ETMY crane horizontal drive gear box dead and left just before the film crew showed up.
New gear box should be here by the end of this week for installation.
The lab air quality is high ~20,000 counts of particles of 0.5 micron. Keep an eye on this before you open the chamber.
While Kiwamu was finalizing the X green alignment, I started to prepare to remove the ETMY door, and begin checking out its OSEMs, etc, so we could start moving it to it's new place, and figure out why it's been wonky for a while. I ran the particle counter, and we have a factor of ~5 more particles than normal. Kiwamu and I agreed not to open ETMY. Since we had briefly opened the IOO and Output Optics chambers to check the X green's position on the PSL table, we immediately shut those doors. They were probably open for ~15 minutes or so. (Yes Steve, we should have checked before opening any doors, but at least we remembered to check at all, and the doors were only open for a few minutes rather than for a few hours.)
I attach a 24hrs trend of the particle counts, for reference. It looks like it's been a little high for a while, but today it's really dirty in the air.
The east end particle count is 155K for 0.3 micron and 15K for 0.5 micron counts/cf min. In order to minimize diffusion of dirt into the IFO we set up the mobile HEPA with CP Stat 100 tent.
This set up gives us practically ZERO inside the tent
The RGA region is beeing monitored during the vent. This will tell us how clean the RGA itself is.
I measured the particles coming off of new- unused clean room coat. Tyvek, Convertors, Allegiance #9393 measured 10 counts of 0.3 micron at 1 minute and 0 count at 7 minute.
The 0.5 micron size measured 0 at both times. Jenne's used coat measured 20 counts of 0.3 micron and 0 counts for 0.5 micron at 1 minute. ( counts / cf- min)
The HEPA tent background is consistently 0 when it's CP STAT 100 curtains are closed.
Jenne found a big scratch on the north vac door of ITMY. Fortunately it does not reach the inner annulos 0 -ring seal.
This is precisely what we have to avoid to preserve our vacuum system!
Suresh and I tweaked the OSEM angles in ETMX yesterday. Last night the ETMs were left free swinging, and today I ran Rana's peakFit scripts on ETMX to check the input diagnolization:
It's well inverted, but the matrix elements are not great:
pit yaw pos side butt
UL 0.3466 0.4685 1.6092 0.3107 1.0428
UR 0.2630 -1.5315 1.7894 -0.0706 -1.1859
LR -1.7370 -1.5681 0.3908 -0.0964 0.9392
LL -1.6534 0.4319 0.2106 0.2849 -0.8320
SD 1.0834 -2.6676 -0.9920 1.0000 -0.1101
The magnets are all pretty well centered in the OSEMS, and we worked at rotating the OSEMS such that the bounce mode was minimized.
Rana and Koji are working on ETMY now. Maybe they'll come up with a better procedure.
I'm having this problem with DTV every morning at Rosalba only. It wants to start with a negative GPS time and it can not connect to the frame builder.
Normally after a few time of starting it, it will work.
Gear box found, it's lead time one week at $825 The crane may be functional round August 25
I'm looking for an ether net based power switch for turning lights on and off for the vacuum system from MEDM screen. This is what I found
Jamie please take a look at it.
While waiting for the IFO team to align things (there were already ~5 people working on a ~1 person job...), I got all of our supplies prepped for drag wiping in the morning.
The syringes are still on the flow bench down the Xarm. I put fresh alcohol from unopened spectrometer-grade bottles into our alcohol drag wiping bottles.
The ITMs already had rails for marking their position in place from the last time we drag wiped. I placed marker-rails for both ETMs.
We should use the deionizer before drag wiping with isopropanol.
damped sus at atm1 and freeswingging sus at atm2
Light into the MC is 20 mW at atm, MC_Transmitted ~10 MW = 400 count
The PMC_T is OK but something else is drifting.
Free swingging OSEM sensors LL at atm
UTILITY & SERVICE INTERRUPTION
Building: Central Engineering Services (C.E.S.)
LIGO Gravitational Physics building adjacent to C.E.S. 40M- Lab
Safety Storage adjacent to CES
Date: Saturday, October 1, 2011
Time: 8:00 a.m. To 9:00 a.m.
Contact: Mike Anchondo ext. 4999 Tom Brennan 4984
*This interruption is required for maintenance of high voltage switchgear in Campus Sub Station.
(If there is a problem with this Interruption, please notify
the Service Center X-4717 or the above Contact as soon as possible.
If no response is received we will proceed with the interruption.)
Director, Campus Operations & Maintenance
Cranes are checked and they are ready for lifting. At the east end will use the manual Genei-lift to put door on.
We've closed up ETMX:
jamie, jenne, kiwamu, suresh, steve
ETMY and ITMY were treated the same way as ETMX. The BS chamber was closed with heavy vac door yesterday also. The IOO access connector's inner jamnuts are torqued to 45 ft/lbs as all vac door bolts.
The vac envelope is ready for pumpdown condition, except ITMX chamber with light atm door cover.
Jenne will summeries the condition of dust on the TMs before and after the drag wipes.
Jamie is modeling our next generation in-vac & clean room bonny suit that Jenne and myself already tested.
It is quite bearable with our traditional cleanroom beret-bouffant cap. Please use these in the future.
This will help to avoid the farther degradation of somewhat dusty 40m vac envelope.
It is the required dress code to enter the clean assembly room in the 40m.
We have small, med, large and x-large in stock. I'm getting larger sizes.
It will not allow certain people to climb inside the vacuum chamber in dirty pants.
Dmass just reminded me that the usual procedure is to bake the optics after the last gluing, before putting them into the chambers. Does anyone have opinions on this?
On the one hand, it's probably safer to do a vacuum bake, just to be sure. On the other hand, even if we could use one of the ovens immediately, it's a 48 hour bake, plus cool down time. But they're working on aLIGO cables, and might not have an oven for us for a while. Thoughts?
Follow full procedure for full strength, minimum risk
New gear box installed and tested by Fred KoneCranes.
Jamie and Shuresh moved in Jenne's 11 drawers cabinet and relocated old note book boxes on the inside of the vac tube.
I have restored the damping of BS and PRM. Today is janitor day. He is shaking things around the lab.
Uniblitz mechanical shutter installed in the green beam path at ETMY-ISCT The remote control cable has not been connected.
The RGA back ground at day 29 of this vent.
Atm1, ITMY and the SRM are on the same isolation stack. So why does the SRM move twice as much?
Atm2, We should check the ITMY SIDE_OSEM before pump down. Anatomically correct, beautiful picture taken by Kiwamu on August 22
Suresh, Kiwamu and Steve
Heavy chamber doors replaced by light ones at ITMX-west and ITMY-north locations.
The new ITMX was aligned by changing the DC biases.
The resultant DC biases are reasonably small.
C1:SUS-ITMX_PIT_COMM = -0.2909
C1:SUS-ITMX_YAW_COMM = -0.0617
The alignment was done by trying to resonate the green light in the X arm cavity.
The spot position of the green light on the ITMX mirror looked good. This was confirmed by inserting a sensor card.
I did the OSEM mid-range adjustment and the rotation adjustment but at the end the OSEM DC voltage has changed due to the DC bias operation.
The OSEM rotation was approximately optimized so that all the face shadow sensors are sensitive to the POS motion but the SIDE shadow sensor is insensitive to the POS motion.
It needs a free swinging diagnosis.
ITMX OSEMs UL 1.8V, UR 1.7V, LR 0V, LL 0V, SD 1.3V at the same bias setting shown above. May be a lose earth quake tip?or magnet is touching?
All fine, except ITMX_sensor_UL's 60 counts deep hoop for an hour.
Jamie and Steve
We closed ITMX and ITMY chambers and started pumping around 11am
What we did before:
1, turned off AC power to PZT Jena HV ps
2, checked jam nut positions
3, cheched single o-ring shims
4, closed psl out shutter
I just tried to adjust the ETMY camera and its not very user friendly = NEEDS FIXING.
* Camera view is upside down.
* Camera lens is contacting the lexan viewport cover; this means the focus cannot be adjusted without misaligning the camera.
* There's no strain relief of the camera cables at the can. Needs a rubber cable grommet too.
* There's a BNC "T" in the cable line.
Probably similar issues with some of the other setups; they've had aluminum foil covers for too long. We'll have a camera committee meeting tomorrow to see how to proceed.
ITMY has been upgraded here I have the new lenses on hand to do the others when it fit into the schedule.
We are at 30 Torr of 7 hours of pumping with 2 roughing pumps.
Kiwamu will take over the rest of the roughing today. He will keep an eye on the pumping speed to be ~1-2 Torr/min and open up the manual RV1 valve if needed.
The present status is #3023 of "chamber open to vacuum open" mode and waiting the P1 pressure to drop to 500 mTorr
He will do the following to stop pumping at P1 = 500 mTorr
1, close V3
2, close RV1 with torque wheel
3, turn off PR1 & 3
4, disconnect metal hose between RV1 and PR3
I will start the Maglev tomorrow morning.
Vacuum status: " vacuum normal" CC1 pressure 5e-5 Torr
Slow roughing through butterfly valve took 11 hours at 1-2 Torr/min speed. We had a leak at the metal hose connecting o-ring that became visible at 200 Torr.
The vacuum envelope pressure rose to 500 mTorr from 450 mTorr This is 50 mTorr leak plus outgassing over 11 hrs over night stop = 5 mTorr / hr
Atm2, Maglev pumpdown details. P2 and P3 are in the foreline of the Maglev. The pressure peaks at 4 Torr beacause the 3 drypumps have little pumpimg speed at this range.
External fan is turned on during this one hour period to prevent Maglev turbo from overheating.
Same things are happenning with the two small TP2 and TP3 pumps under load. Their foreline pressure peak at 1 Torr. They slow down to 45 K RPM from 50K RPM and warm up to 36-39 C
Precondition: 36 days at atm
We tried not to open chambers above 10,000 particles of 0.5 micron cf/min
New items going in: 2 rasor beam traps, 5 badly oxidized old silver plated setscrew with spring loaded tips......to be replaced in the future, viton tips for eq screws....some are lose, gold plated allen wrench installed at ITMX bottom, reglued magnet on ITMX
Bad hardware things found: nylon ball "locking elements" on OSEM locking set screws with screwdriver slot, lose 1064 nm filter on OSEM pd
I lined up the Y Arm for locking and then centered the oplevs for ETMY and ITMY.
* The ITMY OL has still got the old style laser. Steve, pleaes swap this one for a HeNe. Also the optical layout seems strange: there are two copies of the laser beam going into the chamber (??). Also, the QPD transimpedance needs to be increase by a factor of ~10. We're only getting ~500 counts per quadrant. Its worth it for someone to re-examine the whole ITMY OL beam layout.
* The ETMY OL beam was coming out but clipping on the mount for the ETMY OL HeNe. This indicates a failure on our part to do the ETMY closeout alignment properly. In fact, I get the feeling from looking around that we overlooked aligning the OL and IPPOS/ANG beams this time. If we're unlucky this could cause us to vent again. I undid part of the laser mount and changed the height on the receiving mirror to get the beam back onto the QPD.
I noticed that there is significant green light now getting into some of the IR PDs; beacuse of this there are weird offsets in the TRY QPD and perhaps elsewhere. We had better purchase some filters to tape over the front of the sensitive IR sensors to prevent the couplling from the green laser.
* There is a beam on IPPOS, but its too big for the detector (this has always been the case). We need to put a 2" lens with a weak focusing power on this path so as to halve the beam size on the detector. Right now its clipping and misleading. There is also a 0.9V offset on the SUM signal. I'm not sure if this readout is working at all.
* I couldn't find any beam on IPANG at all. Not sure what's changed since Kiwamu saw it.
Old Coherent diode laser was replaced by Uniphase HE/NE 1125P at ITMX.
Newport 10B20NC.1 broadband beam sampler set up as beamspitter to dump 90% of the light into beam trap. Beam in to test mass 0.7 mW , returning to qpd 0.07 mW = ~ 3,700 counts
f 1.5 m lens placed into ingoing beam path to reduce the spot size on the qpd. ITMY oplev will be done in this manner tomorrow.
* IP-ANG is lost with the Piezo Jena PS
* IP-POS cable have to be found at the LSC rack
The PRM damping was restored at side sensor var 1050