||Fri Aug 15 19:32:49 2008
|I have just reached vacuum normal. The maglev peaked at 49.8C body temp with aux fan on at 3.2 Torr|
note: pumpdown was put on hold for Koji's goodby lunch
||Mon Aug 18 09:19:55 2008
||steve||Summary||VAC||11 days at atm|
|It took 11 days to fix earth quake triggered sus problems of ITMX, SRM and PRM|
Only ITMX north and BSC north vac doors were removed.
The PRM sus had to be removed form the vac envelope for "hip replacement"-new wire stand off was
epoxied in place.
Note: the PRM has no guide rod on the other side
ITMX, SRM and BS osems were optimized in place.
No crosscoupling optimization was performed.
Beam block was removed from ITMXC, it was too close to the main beam.
POX pick off mirror and mount will be replaced next vent.
Vac viewports were inspected from the inside.
||Thu Aug 21 10:24:20 2008
||steve||Configuration||SAFETY||laser safe mode condition|
|The MOPA and PSL shutters are closed.|
Manual beam blocks are in place.
Enclosure interlock is enabled.
No other high power laser is in operation.
We are in laser safe of operation for visiting students from Japan
NO safety glasses required
||Thu Aug 21 16:28:59 2008
||steve||Configuration||SAFETY||safety glasses required |
|I just opened the MOPA shutter so PA is warming up.|
High power beam path is cleared and laser safety glasses required.
||Fri Aug 22 16:06:29 2008
||steve||Update||PEM||particle counter replaced, flowbenches & HEPAs checked|
|MetOne #2 counter was swapped in (on the top of IOC, facing SW direction, at ~75 deg upwards)|
with channel one size 0.3 micron and channel two size 1.0 micron.
Sampling time was reduced from 60s to 6 sec at 0.1 cf/min at 25 min rate.
This means that displayed number needs to be multiplied by x100 to get particles/cf/min
HEPA filters and flow benches were checked:
PSL enclosure closed, HEPA speed at 60% 0-0 particles on optical table NW corner
AP covered optical table 1,000 particles of 0.3micron and 10 of 1.0 micron at NE corner
Flow bench at SE 0-0 particle (p)
on the top of SP cover at SE corner 60,000 p of 0.3 micron and 530 p of 1.0 micron
Mobile HEPAs 10cm from output screen in the center 800 p of 0.3 micron and 0 p of 1 micron
These filters will be replaced.
Clean assembly room:
both flow benches 0-0 p for 0.3-1.0 micron
east side bench 520 p of 0.3 micron and 210 p of 1.0 micron
Large hood in baking room with fan on 1.7 million p of 0.3 micron
and 16,000 p of 1.0 micron
Pasadena air just outside of main entrance:
3 million p of 0.3 micron and 30,000 p of 1.0 micron
My desk 743,000 p of 0.3micron, 63,000 p of 0.5 micron and 5,500 p of 1.0 micron cf/min
NOTE: existing COCHECKLIST.adl PEM displays needs to be corrected so it shows the 10 fold increase
and change particle size on this screen to 0.3 micron
||Mon Aug 25 10:23:53 2008
|Rack 1Y7 double violation:|
BNC cables left to be jammed by door
and see destroyed BNCs
RED fibers should be rerouted.
I placed protective obstacle in position
so the door can not be closed.
Please do not do this!
DNA analysis is in progress on your finger prints.
||Mon Aug 25 10:51:06 2008
||steve||Update||PSL||psl headtemp is coming down|
|The laser water cooler was overflowing this morning.|
I removed 500 cc water from the chiller.
The 4 days plot shows clearly:
that the capacity of the chiller is depending on the water level.
Overflowing water is a heat load for the chiller, so laser head temp goes up.
||Tue Aug 26 09:58:59 2008
||steve||Omnistructure||COC||ETMX is #03|
|This is the picture of ETMX from the upper south west viewport|
||Tue Aug 26 15:06:16 2008
|Pumpdown 66 PRM-maglev vac normal -day 11|
short form: pd66PRM-m-d11
||Fri Aug 29 15:01:45 2008
||steve||Update||PSL||MOPA_HTEMP in increasing|
|The laser chiller temp is 21.9C ( it should be 20.0C )|
Control room temp 73F ok, no obvious block
Ops, there is a piece of paper blocking the intake of the chiller
This is a four day plot. The paper was blocking the air flow all day.
||Tue Sep 2 10:09:03 2008
||steve||Update||PSL||head temp is cooling down|
|The chiller was over flowing this morning.|
800 cc of water was removed.
PSL-126MOPA_HTEMP peaked at 20.7 C (normal is 18.7 C)
||Fri Sep 5 08:34:03 2008
|The MC is happy.|
The MZ can be locked if you move the slider by hand.
||Fri Sep 5 10:36:34 2008
||steve||Update||PEM||thermostate setting changed|
|Some one changed the thermostat (old control room ) setting behind 1Y6 from 73 to 79F|
It should be in the elog.
The temp changed from freezing 20 to sunny 25 C
||Mon Sep 8 10:57:49 2008
||steve||Update||IOO||the psl and mc are back to normal|
|The alarm handler is silent this morning.|
This is almost unbelievably pleasant after two mount of harassment.
The MC did not lose lock for three days.
Atm1: the new fss layout
Atm2: PMC with lead brick
Atm3: 3 days plot
||Mon Sep 8 13:47:35 2008
||steve||Update||PEM||thermostate setting changed|
|Some one changed the thermostat (old control room ) setting behind 1Y6 from 73 to 79F|
It should be in the elog.
In fact, it is. I demand satisfaction for the injury to my elogging reputation!
Thermostate setting was changed from 79F to 77F behind 1Y6
||Wed Sep 10 08:57:03 2008
||steve||Update||General||etmy illuminator turned off|
|The ETMY illuminator was left on yesterday.|
I just turned it off.
||Thu Sep 11 14:27:53 2008
|Peter Kalmus received 40m specific safety training last week.|
||Thu Sep 18 09:30:12 2008
||steve||Update||General||low noise metal film resistors are in|
|Low noise metal film resistor and capacitor kits from www.garrettelec.com are in.|
manufacturer: Dale, 289 values, 25ea, surface mount,1206, 0.1% from 100 to 100K, 1/8 or 1/4W
additional values below 100 ohm and above 100K were purchased from Mouser with the same Dale specification
Ceramic capacitor kit from AVX
67 values, 25ea, surface mount, 1206 from 1.0 pF up
atm2: our new storage cabinet pick and put together by Jenni
||Fri Sep 19 08:09:55 2008
||steve||Update||PSL||psl HEPAs turned on|
|I have just turned on the PSL HEPA filters at 60% operational speed.|
||Fri Sep 19 11:48:14 2008
||steve||Update||Computers|| old hubs can make one happy|
|Joseph finds a XIX century bottle neck hub: CentreCOM 3624TR 10Base-T |
and happily replaces it with Netgear GS724T 1000Base-T
||Tue Sep 23 11:17:59 2008
||steve||Update||PSL||PMC scattering spot|
|The PMC output side has a new madly scattering spot at chamfer 2 o'clock position|
||Fri Sep 26 09:05:47 2008
||steve||Update||SUS||MC2 damping restored|
|The MC2 sus damping was restored.|
||Mon Sep 29 11:17:14 2008
||steve||Update||SAFETY||horizontal viewports are protected with lexan|
|The four horizontal viewports of arms are protected |
by 3/8" thick, 8.5" OD Lexan disk of MR10 Polycarbonate.
ITMX, ETMX, ITMY and ETMY ccd cameras are not focused now.
||Mon Sep 29 15:09:36 2008
||steve||Update||PSL||almost 4 yrs plot of power & temps|
|The water chiller is normally running 1.5 C warmer than the laser head temp.|
When control room temp is stable and PEM-count_temp is stable we can expect the head temp to be stable 20.0 C
PSL-126MOPA_HTEMP is running warmer in the last ~40 days
The ifo arm thermostate temp settings were raised by 2 F on 8-11-08
||Thu Oct 2 16:44:28 2008
|The idea is to push the UGF to 10 Hz of the TM oplev servos with quiet HeNe laser.|
We measured good intensity noise of JDS 1103P in May 2007 and converted most of the TM oplevs to it.
The ITMs still have the noisy 670nm , 1 mW, diode lasers to begin with.
In order to get 1 mW power returning to the qpds I measured the power going to TMs
and returning on qpds ...so we can select the appropriate laser power for the conversion.
40m optical lever lasers:
HeNe laser JDS 1103P, 633nm, linear polarization 500:1,
ETMX: qpd 0.12 mw (4%) reflected of 3 mW,
ETMY: qpd 0.1o (3.8%) " 2.6
BS: qpd 0.02 ( 2.5%) " 0.8
PRM: qpd 0.01 (1.3%) " 0.75
SRM: qpd 0.08 (10%) " 0.8
Coherent 670 nm Diode Lasers VLM-tm, 0.95 mW, linear polarization 100:1,
ITMX: qpd 0.1 mW (11%) reflected back from TM of 0.9 mW
ITMY: qpd 0.04 (7%) " " 0.6
It seems that JDS HeNe laser 633 nm, linear polarization 500:1, 10 mW will do the job
||Mon Oct 6 10:00:49 2008
||steve||Update||MOPA||MOPA_HTEMP is up|
|Monday morning conditions:|
The laser head temp is up to 20.5 C
The laser shut down on Friday without any good reason.
I was expecting the temp to come down slowly. It did not.
The control room temp is 73-74 F, Matt Evans air deflector in perfect position.
The laser chiller temp is 22.2 C
ISS is saturating. Alarm is on. Turning gain down from 7 to 2 pleases alarm handler.
c1LSC computer is down
||Mon Oct 20 09:45:56 2008
||steve||Update||PEM||PSL HEPA on|
|The PSL HEPA filter was turned on.|
It should be running all times.
The 0.5 micron particle count is up to 20,000 this morning.
||Tue Oct 21 16:14:42 2008
||steve||Update||General||divergence of He Ne 1035P|
|The ITM oplevs laser diodes are noisy.|
They will be replaced by JDS 1035P
SN T8093307 was measured with the beamscanner.
This will able us to calculate the right lenses to get a small beam on the qpd.
The first column is distance from the front face of the laser in cm.
The second column is beam diameter in the horizontal direction in microns.
The third column is the beam diameter in the vertical direction in microns.(edit by Rana)
||Wed Oct 22 16:22:53 2008
||steve||Bureaucracy||SAFETY||Caryn received safety training|
|Caryn Polatchi has received 40m safety training on Monday, Oct 20|
||Thu Oct 23 11:26:25 2008
||steve||Bureaucracy||VAC||optosigma forks for vacuum|
|Nine short forks from OptoSigma were cleaned, baked and measured by Bob T.|
They passed the LIGO vac compatiblity test as Rana predicted.
Remember: Thorlab and Newfocus forks failed this qualification process.
||Fri Oct 24 11:09:08 2008
||steve||Update||SAFETY||more lexan plates under cameras|
|The MC2, MC3&1 and BSC-SUS cameras were repositioned somewhat in the |
process of placing lexan disks under neat them.
MC1&3 will have to be readjusted.
Now all horizontal viewports are protected.
||Fri Oct 24 15:05:13 2008
||steve||Update||VAC||rga is out of order|
|The old Dycor RGA is out of order.|
I'm getting ready to purchase an SRS instrument.
||Mon Oct 27 11:23:10 2008
||steve||Update||Photos||new Olympus camera with IR vision|
|The IR blocker was removed from our new Olympus camera |
SP 570UZ camera.
It has image stabilization, zoom 26-520 mm (20x optical)
and 10.7 Mpixel
||Fri Oct 31 08:52:19 2008
||steve||Update||SUS||ETMY damping restored|
|ETMY watchdogs were tripped yesterday morning also. This is a problem that existed some months ago.(?)|
Our seimo channels are inactive.
||Mon Nov 3 09:59:47 2008
||steve||Update||PSL||PSL HEPAs turned on|
|The psl enclosure HEPAs were tuned on.|
Loose paper drawing was found on the psl inside shelf.
This can fall down into the beam and ignite a tragedy.
Thanks for the color coded correction. My spell checker is not reliable
||Thu Nov 6 09:45:27 2008
||steve||Update||MOPA||head temp hick-up vs power |
|The control room AC temp was lowered from 74F to 70F around Oct 10|
This hold the head temp rock solid 18.45C for ~30 days as it shows on this 40 days plot.
We just had our first head temp hick-up
note: the laser chiller did not produce any water during this period
||Thu Nov 6 10:06:41 2008
||steve||Update||Locking||arms lock degradation|
|I have been locking the arms in the mornings lately.|
The daily drift of LSC-TRX is ~ 15% and LSC-TRY ~5%
||Fri Nov 7 08:08:00 2008
||steve||Update||PEM||AC turned off in IFO room|
|All tree AC units in IFO room 104 switched off at 7:45am|
I'm looking for the periodic thump signal in the Vertex area
noted in entry 1113 of PEM-ACC_MC1
||Fri Nov 7 10:52:57 2008
||steve||Update||PEM||AC is back on|
|The 20 minutes and 6 sec thumps are not related to the 40m ac units|
This period is precisely right on so it is not likely mechanical as a source.
The time and frequency domain of this signal at attachment 2&3
First I had the chilling water cut off and later I turned off the fans
as 5 hrs temp plot shows
||Fri Nov 7 16:05:55 2008
||steve||Bureaucracy||SAFETY||insect killer sprayed at kitchen area !|
Bob and I cleaned out the sink area and sprayed
Spectracide's BUG STOP insect killer solution on the shelfs and sink
table top area.
NO eating or coffee drinking till Monday
This is an effort to stop the ants coming.
||Mon Nov 10 16:44:14 2008
||steve||Update||PEM||particle counter at MC2|
|The particle counter was moved to MC2 table temporarily.|
It is clamped to the table at the south west corner.
It is pumping for 20s and waiting for 2 minutes now.
||Mon Nov 10 19:39:40 2008
||steve||Update||PEM||thump noise from particle counter|
|The particle counter is back on the IOOC location on a piece of FOAM |
It needs this isolation, so when the pump is running, it's not shaking things.
The counter was counting for 6 sec and it was on holding for 20 mins.
Now I set the counter for 20 sec so it is easy to recognise it's signal and it holds for 2min only.
This will set the alarm handler in action.
Atm1: 40 mins plot
PEM-ACC_MC2_x,y,z up to 13 mins: pcounter at MC2 table, clamped, counting for 20s and holds for 2 mins
PEM-ACC_MC2_x,y,z from 13 to 26 mins: pcounter at MC2 table, not clamped, seated on 2" foam, counting 20s and holds for 2 mins
PEM-ACC_MC1_x,y,z from 26 to 40 mins: pcounter at MC1_IOOC location, not clamped, seated on 2" foam, counting 20s and holds for 2 mins
Rana won the bet
|I'll bet Steve a dollar that it is mechanical. The attached PDF compares all of the accelerometers from right now.|
You can see that the RMS in MC2 is way bigger than MC1.
In the second PDF file you can see the time series. I had to play around a lot with DTT to get it to work. The DTT/Foton
combo on Allegra is not stable, so make sure your work early and often.
In the plots shown, I am bandpassing the time series from 600-700 Hz. I found that doing so allowed the burp in MC1 to remain
large and reduce the extraneous fuzz in MC2. As you can see there is no such noise in MC2.
So its a noise around 600-700 Hz that comes on quickly and then shuts off after several seconds. Its also very periodic in that
it comes on around every 20 minutes. Steve also tells me (although he refuses to put in the elog) that it started up around
August 20th (?). I feel like someone in the 40m lab ought to be able to guess what this is at this point.
Please convince Steve to elog his findings about when the noise started.
If one goes out there and stands next to it when the trend predicts its happening it becomes clear what it is.
||Fri Nov 14 11:33:19 2008
|Old Dycor rga is removed and new SRS-RGA200 installed.|
It is pumped down and ready for hooking up its RS-232 output for operation.
||Thu Nov 20 09:37:39 2008
||steve||Update||PSL||MZ vs temp|
|This 12 days plot shows that it can hold lock if the daily temp variation is not more than 3/4 of a degree C|
The MZ is happy if it's HV is above 100V
||Fri Dec 19 16:38:09 2008
||steve||Update||LSC||all optlevs centered|
|All optlevs were centered after full alignment.|
Qpd sums are:
ETMX 12,229 counts
||Sun Dec 21 13:00:06 2008
||steve||Update||all down cond.||vac and laser back on|
|There was a power outage sometimes early Saturday.|
All things are down.
The Maglev was started and reached normal operating condition.
V1 was opened at P1 3.8 mTorr and cc1 is back to 3e-6 Torr now
The MOPA was turned on.
Ion pump HV on to FSS cavity.
||Fri Jan 9 09:14:17 2009
||steve||Update||PEM||ifo is recovered after eq|
|There is no obvious damage from last night earth quake.|
All sus dampings were turned on, MC locked and the arms locked right on
||Fri Jan 9 16:52:18 2009
||steve||Update||VAC||tp3 forline pump replaced|
|Alberto took 40m vacuum 101 class as we replaced the drypump at the annulus pump line.|
He is still not authorized to use the monster 2 3/8" open end wrench that is 36" long.
The fore line pressure dropped to 20 mTorr from 1 Torr as the pumps were swapped.
Bob needs to be given credit for replacing the tip seal on this Varian SH-100 drypump
The ss-hose felt dry at the tp3 exhaust end but it was some what "teflon coated-placticky-
-almost oily" at intake end of the dry pump.
We'll have to replace this metal hose next time.
This is a reminder that the 40m vacuum operation is fully manual.
It requires two people to switch a vacuum valve and one of them has to be experienced.
||Wed Jan 14 09:22:43 2009
||steve||HowTo||VAC||N2 supply pressure lowered for vac valves|
|I've been replacing the N2 bottles recently.|
I noticed that the consumption is too high. I had to replace them every two days.
Normally the interval is three or more days.
I suspect there is some leak in the line.
Strangely, it is always the left hand bottle which goes empty. The right hand bottle has been
there for more than a week at about 1000 psi.
We should check it when Steve is back.
All vac valves operated by N2
The two cylinders are located in entry room 103
There is an auto switch over valve between them to insure continuous supply.
The pressure regulator should be set 70 PSI on the gauge
This pressure we keep constant.
All vac valves will close in case of running out of N2 or losing ac power so
it is essential that one replaces empty N2 cylinder.
Simply disconnect large CGA580 fitting with a crescent wrench.
Swap in full cylinder from outside, reconnect fitting tightly and open cylinder valve.
Now you should be reading the full cylinder pressure.
Write each cylinder pressure and date-time on the board so one can see if there is a leak
||Wed Jan 14 10:59:06 2009
||steve||Bureaucracy||VAC||rga waiting to be "connected"|
|We have no RGA data since old Dycor passed away in the middle of Oct, 2008|
New SRS-RGA200 was installed on the vac envelope on Nov 14, 2008
It is waiting to be software connected to the 40m logging