Aluminum shield replaced by razor beam dump.
New razor beam dump installed to trap reflected beam of the input vacuum window.
Instrument rack power supplies checked and labeled at present loads.
The vacuum rack Sorensen is running HOT! Their is only 0.3A load at 24V There is plenty of space around it.
It is alarming to me because all vacuum valve positions are controlled by this 24V
The temperature went down to room temp with temporary fan in the back. Voltage and current are stable.
Regardless, it will be replaced early next week.
40m crew and visitor Holger Muller from Berkeley.
This is not a test. Life can be dangerous in the 40m Control Room.
The lamp lasted for 4,622 hours.
This time I purchased just the bare lamp itself . The housing doubles the price. The disadvantage of this technic that the lamp housing window can not be cleaned perfectly. Atm2 picture is exaggerating this spot.
However, It does not degrade the image quality.
It was a bad experience again with our vacuum system. The valves went crazy as we rebooted the computer. This was required for the swap in of a good 24V power supply.
The IFO was vented to 27 Torr through the annuloses, VA6, V7, Maglev,VM2 and VM1 (VC2 was open too)
I just opened the PSL shutter after a 4 hours pumpdown.
Condition: annuloses are not pumped, the IFO and the RGA are pumped as Atm2 shows
I will be here tomorrow morning to switch over to vacuum normal.
More details later
The recovery- pumpdown reached valve configuration vacuum normal at 20 hours, cc1 7.7e-6 Torr
Lesson learned: turn all pumps off, close all valves before you reboot ! like you would prepare for AC power shut down.
The date is correct on this monitor.
Last stored RGA scan data Dec 20, 2013
IFO pressure at CC1 5.8e-6 Torr
Valve configuration: Vacuum Normal, confirmable only by manual checking of position indicators and pressure gauge controllers readouts
Events of the power supply swap:
1, Tested 24V DC ps from Todd
2, Closed V1, VM1 and all annulos valves to create safety net for the reboot. Turbo pumps left on running.
3, Turned computer off
4, Swap power supplies and turned it on
5, Turning the power on of c1vac2 created caos switching of valves. This resulted in a air vent as shown below.
6, VM1 was jammed and it was unable to close. The IOO beam shutter closed and the IFO was venting with air for a few minutes. Maglev did an emergency shut down. TP2's V4 and TP3' V5 closed. RP1 and RP3 roughing pumps turned on, their hose was not connected as usual. The RGA shut down to protect itself.
7, Closed annulos valves, stoped the vent at P1 27 torr as the vacuum control was manually recovered
8, The Maglev and the annuloses were roughed out 500 mtorr . The Maglev was restarted.
9, The IFO pump down followed std procedure from 27 torr. VM1 was moving again as the pressure differential was removed from it.
Remember: next time at atm .....rough down the cryo volume from 27 torr !
The trend shows a big jolt to the MC1/3 pointing this morning at 8:30.
If not, we will have to put a 'no janitor' sign on all of the 40m doors permanently to prevent mops misaligning our interferometer.
I was taking pictures at the AP table at the morning and ETMX optical table after noon. There was no activity on the IOO chamber.
Look at the last 2 hours of Rana's trend plot. MC1 and MC2 sensor voltage started increasing.
I think it was a drift action.
IOO QPDs tested in dark, lighted and open PSL enclosure. The created temperature change 0.03 C has effect on monitoring in pitch.
Atm1, all lights off 10 min, PSL enclosure lights on 10 min, all lights off 15 min, open door # 11 at north east corner of enclosure ( HEPA filters are running at 30V ) for 10 min, closed-dark enclosure 15 min
dark 10, lighted 10, dark 15, open-dark 10 and closed-dark 15 minutes
Atm2, Pitch drift of 24 hours does not recover
I looked at IOO QPDs again. QPD_POS was clamped by one screw. Dog clamp was added on the unclamped side.
QPD_ANG chassis has no isolation to optical table..._POS has. QPD_ANG base was tightened also.
Both QPDs moved a little bit but I did not centered them. The spot sizes are 2-3 mm They should be smaller.
How ever, we still can not explane the pitch movement of the IOO beam
Razor beam dumps were labeled at the AP table.
The 40m roof was cleaned from leafs this morning.
I wonder what's drifting between the laser and the PMC? And why is it getting worse lately?
The PMC refl is bad in pitch today, and the transmission is only 0.76, rather than our usual 0.83ish.
I did a quick, rough tweak-up of the alignment, and now we're at 0.825 in transmission.
The PMC transmission continuously degrades. In order to see what is really drifting the laser output after PBS was sampled as shown.
IOO pointing is drifting in pitch. I'd like to use a QPD instead of the paper target to see if the Innolite output is stable. The idea is to move temporarily IOO-QPD_POS to this location
Three good days of IOO pointing: Friday, Sat and Sun What was changed? May be the clamping on Friday?
IOO vertical changes recovering as tempeture. IP is clipping at plastic enclosure of ETMY
NOTE: ANTS at the PSL optical table. I will mop with chemicals tomorrow if we see more.
The Osaka TG390MCAB maglev turbo pump's controller TC010M has passed the 40,000 hrs of operation. This triggered the " alarm" LED warning light to come on.
It is normal maintenance. Maglev TP-1 is running perfectly. Osaka will send us a loaner-controller that we can use while they do the std maintenance.
I'm thinking of ~ February to do this.
I do like to move IOO-QPD_POS temporarily to see that the feedback has anything to do with with the pointing.
GariLyn is using our green light on the west side of the PSL table. The green PDA36As were moved and the HEPA turned up to 60V
It looks like there was a 4.4 magnitude earthquake near Fontana, CA around 1:30am today. This tripped all of the suspension watchdogs, which Q has just now re-enabled.
Earth quake shake down yesterday Atm1
Atm2, today's shake
Steve noticed that the RGA was not logging data and that not all the correct connection lights were on, and he wasn't able to run the "RGAset.py" script (in ...../scripts/RGA/) that sets up the proper parameters.
I looked, and the computer was not mounting the file system. I did a remote shutdown, then Steve went in and pushed the power button to turn the machine back on. After it booted up, it was able to talk to the file system, so I started ..../scripts/RGA/RGAset.py . The first 2 times I ran the script, it reported errors, but the 3rd time, it reported no communication errors. So, now that the computer can again talk to the file system, it should be able to run the cronjob, which is set to take data at 4am every day. Steve will check in the morning to confirm that the data is there. (The last data that's logged is 22Dec2013, 4am, which is right around when Koji reported and then fixed the file system).
We are venting tomorrow. This give us an opportunity to fix sick vacuum controller computer. Jamie volunteered.
Remember to rough down cryo and ion pump volumes. Their pressure can be at 1 Torr range after years of accumulated outgassing. Without total valve controls it is dangerous to have these air pockets. Some of their gate valves can be leaking and that would explane the slower pumpdown speed.
There is BLANK VacControl_BAK.adl screen only.
I can move a valve by disconnecting it's solenoid power if it's position is normally open.
I will close V1 and check computer cable connections and move on with manual - hand disconnect ea valve to be moved into the right position for vent. Valve positions will be confirmed by looking manual indicators on valves.
The 40m vacuum envelope vent is completed with instrument grade air.
Valve configuration: chamber open, RGA is pumped through VM3 by TP3,
PSL output is stable.
We pushed the reset button of c1vac1 and c1vac2 and the vacuum screen is back.
First, we pushed the reset button of c1vac1 and pushed the one on c1vac2.
This did not bring c1vac2 up. We pushed the reset of c1vac2 again and now everything of the vacuum screen is back.
1, Reset works
2, Default values are lost. They actually reversed into open and turn on everything when power recycle c1vac1, c1vac2 or 24V dc power supply. This can vent the IFO in an event of power failure!
It's may be the time to go back to an isolated, vacuum controller only computer.
The present valve configuration at Atm1
a, all annuloses are vented
b, valve cables disconnected at: VC1 and 4 IP gate valves
c, the RGA is off and it is pumped by the Maglev through VM2
d, cryo pump is being roughed with TP3 It's outgassing rate was 25 mTorr / min
e, Roughing hose is disconnected
Please wet WIPE before opening chamber or optical table ! !
with methanol soaked kimwipes.
The Met One particle counter is located on CES wall, just behind ITMX chamber.
The numbers are not so bad, but have you ( ...a) asked the IFO lately?
There was 0.2 mW green at the X end.
The doubling oven temp was changed from 37.5 to 36 degrees C
Power at green shutter 3 mW The alignment was not touched.
Vacuum checks before pump down:
1, check intermittent contact issue in black relay box
2, reconnect cable to ion pumps and vent them to atm before pump down
3, repeat power shutdown-reboot at atmosphere
ETMY damping restored.
I checked the alignment one last time. The arms locked, PRM aligned, oplevs centered.
We went ahead and put the heavy doors ON. Steve is pumping down now!
The ion pumps were vented just before pumpdown and their gate valves were opened.
This is an effort to minimize a possible leak through their gates.
Is there a volunteer who goes home late and would close off the roughing? tonight
Pumpdown completed. IR shutter opened at P1 1 mTorr The block is still in the beam path.
Remember to protect MCR pd before crack up the PSL power.
The ion pump gate valves were just closed by cc1 triggered interlock
The cry pump was "regenerated" during the vent and it's outgassing rate minimized.
CC3 cold cathode gauge was replaced.
Valve configuration for week end:
1, VA6 disconnected to avoid accidental venting the IFO through the annulos
2, VC2 disconnected to insure that the cryo stays closed
3, RGA is not running, It's pressure limit 1e-5 Torr
Valve configuration: Vacuum Normal is reached in really 4 days if we do not count overnight rest of roughing.
VA6 and VC2 are reconnected. I'm turning on the RGA next
All 4 ion pumps were vented with air and pumped down to ~ 1e-4 Torr
Ion pumps gate valve control cables are connected and their pumps are disconnected.
The black relay box was tested repeatedly and it stopped misbehaiving.
We were at atmosphere for 13 days. Chamber BS, ITMX, ITMY and ETMY were opened.
Al foil "cups" were placed on the back side OSEMs of PRM.
The floor was cleaned under the east arm tube with hand held wet towel. We moved staff around and mopped. I did at the bottom of rack 1Y1, 2 and 3.
Last week we did the south arm tube floor.
Next week we 'd like to clean under rack 1X1,2,3, 4, 5, 6 and 7
The input pointing of PRM oplev beam was streered just a touch to remove clipping from it's return.
The spots did not move visibly on these two lenses. The spot diameter on the qpd is ~1.5 mm, 65 micro W and 3440 counts.
Y arm green: Nothing much was disturbed. I touched the steering mirrors and brought GTRY from 0.2 to 0.9.
X arm green: The PDH lock was not very stable mostly because of the low power in green. I changed the oven temperature for the doubler to 36.4 corresponding to maximum green power. GTRX increased from 0.1 to 0.9
Both the X and Y arm green alignment were tuned on the PSL table to their respective beat PDs.
The PSL green shutter was not responding to the medm buttons. I found the PSL green shutter set to 'local' and 'N.O' (these are switches in the shutter controller). I do not see any elog and not sure as to why the controller was even touched in the first place. I set the shutter controls to 'remote' and 'N.C'.
ETMX green power at shutter 3.6 mW at 36.35 C doubler crystal temp. [ Innolight IR settings 2.0 A, 40.83 C, 500 mW before Faraday 1/2 plate ]
ETMY green power at shutter 0.75 mW at 35.8 C doubler crytal temp. [ NPRO IR settings 1.82A, 231 mW_ display, DT 21 C, DTEC +1V, LT 40 C, LTEC 0.1V, T +41.041 ]
1Y4, 1X1,2,3,4 & 5 instrument racks floor space were cleaned.
Alex, Gautam and Steve,
Single mode fiber 50m long is layed out into cable tray that is attached to the beam tube of the Y arm.
It goes from ETMY to PSL enclosure. It is protected at both ends with " clear- pvc, slit corrugated loom tubing " 1.5" ID
The fiber is not protected between 1Y1 and 1Y4
The X -arm fiber is in the high cable tray and it has has coupler mounts.
The Y -arm fiber is in the low cable tray and it has no coupler mounts.
The fibers are only protected at entering and exiting the trays.
We have only 68 ft spare 1.5" ID protective plastic tubing.
The MC is happy (but only for this tiny snapshot in time and most probably will go dysfunctional again as it has been for several months, as of this writing)
1X6, 1X7 and 1X9 instrument racks floor space were cleaned today
The IMC has not been behaving well since this morning and totally not happy when Q was finishing his measurements. The WFS servo had large offsets in pitch. Looking back at the trend and using ezcaservo to restore the suspensions did not help.
I realigned the IMC and brought TRANS SUM to ~18000 and MCREFL to < 0.5. The spot positions are not very good; nearly 2 mm off in pitch on MC1 and MC3. But after the alignment of MC, the WFS servo offsets were below +/-20.
The MC has been locked stably with WFS servo ON for the last few hours.
P.S. I did not touch the WFS pointing or reset the WFS offsets.
Pd 76 and 77 are compared at 30 days of pumping. We spend 13-14 days at atmosphere before each.
Pump down 76 was with leaky ion pump gate valve. The ion pumps are not in use for years so they accumulated some higher pressure PLUS the valve switching caos at computer reboot most likely
increased the ion pumps pressures to about 10-20 torr
I think one of the ion pump gate valve was not sealing well. This leak was holding back pump down speed at pd76
It looks like that ETMX have 2 sticky magnets.
It was little bit surprising to me but Rana's professorial rock'n roll excitation released its sticking on the unconfirmed thing by unconfirmed reason.
I aligned the Xarm manually and via ASS.
Now we are back in the normal state.
This recovery proceeder deserves a pattern
Note: IR shield glass position variations, Atm4
UR osem IR shield glass is pushed back. It came out of its clip holder. The magnet is free.
Atm2, UL & LL magnets centered poorly. Almost hinging on opposite sides.
UR & LR centered well. There have plenty of room to move in an earth quake.