ELOG 40m

Configuration

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

866

Thu Aug 21 16:28:59 2008

Configuration

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.

871

Fri Aug 22 16:06:29 2008

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

875

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.

876

Mon Aug 25 10:51:06 2008

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.

885

Tue Aug 26 09:58:59 2008

This is the picture of ETMX from the upper south west viewport

887

Tue Aug 26 15:06:16 2008

Pumpdown 66 PRM-maglev vac normal -day 11
short form: pd66PRM-m-d11

901

Fri Aug 29 15:01:45 2008

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.

911

Tue Sep 2 10:09:03 2008

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)

931

Fri Sep 5 08:34:03 2008

The MC is happy.
The MZ can be locked if you move the slider by hand.

933

Fri Sep 5 10:36:34 2008

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

935

Mon Sep 8 10:57:49 2008

the psl and mc are back to normal

IOO

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

936

Mon Sep 8 13:47:35 2008

thermostate setting changed

Quote:

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

938

Wed Sep 10 08:57:03 2008

etmy illuminator turned off

General

The ETMY illuminator was left on yesterday.
I just turned it off.

942

Thu Sep 11 14:27:53 2008

Peter Kalmus received 40m specific safety training last week.

962

Thu Sep 18 09:30:12 2008

low noise metal film resistors are in

General

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

971

Fri Sep 19 08:09:55 2008

I have just turned on the PSL HEPA filters at 60% operational speed.

974

Fri Sep 19 11:48:14 2008

old hubs can make one happy

Computers

Joseph finds a XIX century bottle neck hub: CentreCOM 3624TR 10Base-T
and happily replaces it with Netgear GS724T 1000Base-T

984

Tue Sep 23 11:17:59 2008

The PMC output side has a new madly scattering spot at chamfer 2 o'clock position

996

Fri Sep 26 09:05:47 2008

The MC2 sus damping was restored.

1004

Mon Sep 29 11:17:14 2008

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.

1007

Mon Sep 29 15:09:36 2008

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

1020

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

1027

Mon Oct 6 10:00:49 2008

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

1057

Mon Oct 20 09:45:56 2008

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.

1062

Tue Oct 21 16:14:42 2008

divergence of He Ne 1035P

General

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)

1068

Wed Oct 22 16:22:53 2008

Caryn received safety training

Caryn Polatchi has received 40m safety training on Monday, Oct 20

1071

Thu Oct 23 11:26:25 2008

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.

1082

Fri Oct 24 11:09:08 2008

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.

1085

Fri Oct 24 15:05:13 2008

The old Dycor RGA is out of order.
I'm getting ready to purchase an SRS instrument.

1094

Mon Oct 27 11:23:10 2008

new Olympus camera with IR vision

Photos

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

1103

Fri Oct 31 08:52:19 2008

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.

1107

Mon Nov 3 09:59:47 2008

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

1116

Thu Nov 6 09:45:27 2008

head temp hick-up vs power

MOPA

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

1117

Thu Nov 6 10:06:41 2008

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%

1120

Fri Nov 7 08:08:00 2008

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

1121

Fri Nov 7 10:52:57 2008

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

1123

Fri Nov 7 16:05:55 2008

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.

1127

Mon Nov 10 16:44:14 2008

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.

1129

Mon Nov 10 19:39:40 2008

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

Quote:

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.

1134

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.

1149

Thu Nov 20 09:37:39 2008

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

1197

Fri Dec 19 16:38:09 2008

All optlevs were centered after full alignment.

Qpd sums are:
ETMX 12,229 counts
ITMX 9,932
ETMY 12,043
ITMY 4,362
BS 1,880
PRM 1,423
SRM 11,641

1199

Sun Dec 21 13:00:06 2008

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.

1219

Fri Jan 9 09:14:17 2009

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

1220

Fri Jan 9 16:52:18 2009

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.

1226

Wed Jan 14 09:22:43 2009

HowTo

N2 supply pressure lowered for vac valves

Quote:

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

1227

Wed Jan 14 10:59:06 2009