ELOG 40m

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

Attachment 1: IRisin.JPG

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.

Attachment 1: etmy2d.jpg

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

Attachment 1: htpr.jpg

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%

Attachment 1: arms.jpg

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

Attachment 1: acf.jpg

Attachment 2: acc_mc1.jpg

Attachment 3: test.jpg

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.

Attachment 1: partcfm.jpg

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

Attachment 1: mztemp.jpg

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

Attachment 1: eq4.5sb.jpg

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

Attachment 1: n280d.jpg

1227

Wed Jan 14 10:59:06 2009

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

1228

Wed Jan 14 15:53:32 2009

DAQ

PSL

MC temperature sensor

Quote:

I added a channel for the temperature sensor on the MC1/MC3 chamber: C1:PSL-MC_TEMP_SEN.
To do that I had to reboot the frame builder. The slow servo of the FSS had to get restarted, the reference cavity locked and so the PMC and MZ.

Where is this channel?

1229

Thu Jan 15 09:19:32 2009

MC2 sus damping was found tripped at the morning the second time this week.

Damping was restored, ISS gain lowered to avoid saturation, MZ manually locked
and MC locking was back.

1243

Thu Jan 22 08:34:10 2009

Kakeru received 40m safety training yesterday.

He has no authorization to work alone in the high power beam path yet.

1248

Fri Jan 23 10:00:21 2009

PSL

PMC transmission is down

The PMC transmission is going down.
I have not relocked the PMC yet.

Attachment 1: pmc4d.jpg

1273

Thu Feb 5 09:12:29 2009

safety updates & fire alarm test

The fire alarm test was completed at 13:30 yesterday.

I updated the 40M Emergency Calling List by replacing Rob by Yoichy. The calling order: Vass, Aso and Taylor.

Rana and Yoichy were added to the "Registered PSL Operator List" and posted it in the lab. (not in the document, that should be up dated)

We are getting ready for the annual safety audit. It will be held next week at 14:00 Friday, Feb 13, 2009

Please participate in the preparation by correcting it or just tell me.

Rod Luna is organizing the pick up of the following old equipment:

HP laser jet 5000n, 3 of 19" 10 base-T network ports and 4 small hubs,

2 Sun monitors, 1 Viewsonic monitor, 7 keypads and

Hitachi scopes 2 of V-355, 2 of V-422, 1 of V-202 and 1 of V-6165

1280

Fri Feb 6 14:49:31 2009

40M Laser Inventory at Feb 05, 2009

1, Lightwave PA#102 @ 77,910 hrs 1064nm of 2.8W @ 27.65A

NPRO#206 @ 2.4A at PSL enclosure............"Big Boy" is waiting for to be retired but not now.

2, Lightwave NPRO 1064nm of 700mW #415 at AP table.......cavity length measurements of Alberto

3, CrystaLaser IRCL-100-1064S, 1064nmS of 100mW ,sn#IR81132 at east arm cabinet

4, CrystaLaser 1064nm of 180mW # -1274 flq at scattering setup.........flashlight quality

5, RF-PD tester 1064nm of 1.2mW @20mA at SP table

6, Lumix 800-1100nm of 500mW at east arm cabinet

7, JDS-Uniphase 633nmP of 4mW oplev sus laser at 5 places,

plus four spares in east arm cabinet

The same information is posted at the 40M WIKI also

1282

Fri Feb 6 16:23:54 2009

MOPAs and their settings, powers of 7 years in the 40m

Attachment 1: 7ymopas.jpg

1288

Tue Feb 10 10:48:48 2009

safety glasses scanned

All 40m safety glasses are absorbent.

They were scanned by 180 mW 2mm spot size of 1064 nm beam and their transmissions were measured

They showed no degradation.

UVEX 's LOTG-YAG/CO2 glasses (fits over personal glasses) 11 pieces,

Glendale-XC by Bacou-Dalloz, #1166218VLT68% , aerodynamic style, 7 pieces, (4 missing )

KG5- glasses , heavier- made out of glass, 3 pieces,

Thorlab's LG10, 1 piece

Old glasses by "Laser Glass" Nd-YAG, 2 pieces

Totaling 24

Atm.2 showing our muilty wavelength glasses of 1064 and 530 nm

Their transmittance for both wavelength were zero.

Note: if you have prescripton safety glasses I would like to scan it for you !

Attachment 1: sgscan1.png

Attachment 2: sgscan2.png

1293

Wed Feb 11 11:39:17 2009

The vacuum envelope was grounded from the IOO chamber to master ground north (under electric breaker panel L)

with 4GA 25ft red battery cable.

1300

Fri Feb 13 08:38:03 2009

Fri Feb 13 16:30:49 2009

Configuration

General

status quo is disturbed

I have been getting ready for the annual safety inspection in the past 2-3 days.

Meaning cleaning up and disturbing the status quo on the floor mostly under the optical tables and their surroundings.

For example: pd power supplies, He/Ne laser ps. and their positions.

BNC cables and ac power line positions can be different.

The new rule: no electronic equipment on the floor.

All electronic equipment were moved-placed into a plastic dish or tray.

1319

Wed Feb 18 15:31:38 2009

emergency back-up lights checked

All 13 exit and emergency back-up lights and their batteries were checked.

Two of the batteries were replaced.

1324

Thu Feb 19 11:51:56 2009

HTEMP variation is too much

MOPA

The C1:PSL-MOPA_HTEMP variation is more than 0.5 C daily

Normally this temp stays well within 0.1 C

This 80 days plots shows that we have just entered this unstable region some days ago.

The control room temp set unchanged at 70 F, actual temp at ac-mon 69-70 with occasional peaks at 74 F

Water temp at chiller repeatedly around 20.6 C at 8 am

This should be rock solid at 20.00C +- 0.02C

Attachment 1: 80dhtemp.jpg

1332

Mon Feb 23 11:07:01 2009

Kiwamu receives safety training

Osamu and Kiwamu received 40m safety training on Thursday, Feb 19, 2009

Kiwamu needs Osamu's close supervision at PSL enclosure and AP table

I hope they already read, understood and signed the laser SOP

1347

Tue Mar 3 08:44:31 2009

air cond. maintenance today

IFO room 104 air conditions will be shut down for maintenance today.

This should be finished by noon.

The temperature and particle count variation can be more than usual.

1387

Wed Mar 11 16:41:22 2009

The spare M126N-1064-700, sn 5519 of Dec 2006 rebuilt NPRO's power output

measured 750mW at DC2.06A with Ohpir meter.

Alberto's controller unit 125/126-OPN-PS, sn516m was disconnected from lenght measurment NPRO on the AP table.

5519 NPRO was clamp to the optical table without heatsink and it was on for 15 minutes.

1411

Fri Mar 20 11:01:02 2009

particle counts are high

The outside particle counts for 0.5 micron are 3 million this morning at 9am. Low clouds, foggy condition with low inversion layer.

This makes the 40m lab 30-50K

I just turned on the HEPA filter at the PSL enclosure.

Please, leave it on high

Attachment 1: particles32d.jpg

1414

Fri Mar 20 15:54:29 2009

480V crane power switch on MEZ

Omnistructure

General

CES Mezzanine is beeing rebuilt to accommodate our new neighbor: the 20ft high water slide...& .jacuzzi

All our ac power transformers are up there. Yesterday we labelled the power switch of 480VAC on the mezz

that we need to keep to run the 3 cranes in the lab.

1420

Tue Mar 24 09:04:02 2009

SRM, ITMX, ETMX, ITMY and ETMY lost damping at 4:55am this morning from 4.8 magnitude earthquake.

Their damping were restored.

C1:SUS-ITMX_URSEN_OUTPUT swich was found in off position. It was turned on.

MZehnder and MC were locked.

The WFS qpd spot needs recentering

1427

Wed Mar 25 09:55:45 2009

IOO

glitching sensors of MC

SUS-MC1_SENSOR_SIDE and SUS-MC2_SENSOR_UL are glitching

Yesterday's 4.8mag earthquake at Salton Sea is shown on Channel 1

Attachment 1: glitchesofMC.jpg

1439

Sun Mar 29 13:44:27 2009

ETMY sus damping restored

SUS

ETMY sus damping was found to be tripped.

It was retored.

All fluorecent light were turned off. Please try to conserve some energy.

1445

Mon Mar 30 15:51:27 2009

HP4291A left the lab to be repaired

Electronics

Eric Gustafson is handling the old HP4291A rehabilitation. Tarac picked both units up today.

March of 2008 Tucker Electronics failed to fix it's intermittent ~25MHz 0.5V oscillation at the swept sine output

See 40m-elog id:398 on 3-24-2008 by Rob Ward

1447

Tue Mar 31 09:42:32 2009

ETMY sus damping restored again

The Caltech gasoline storage tank is being upgraded.

They are jack hammering and digging with bulldozer 50 yards south of ETMY

1448

Wed Apr 1 10:22:13 2009

RGA logging is working

Thanks to Joe B who made the SRS RGA working with linux

Last data file logged at 2008 Oct 24 with old Dycor unit

First data file logged at 2009 Feb 10 with SRS

Attachment 1: rga-090401.png

1452

Fri Apr 3 10:01:50 2009

rgascan with temp plot

Rga scan of day 231 since pumpdown pd66-m-d231

m stands for maglev pumping speed, vacuum normal condition of valves,

cc4 cold cathode gauge at the rga location,

cc1 is real ifo pressure from the 24" tube at the pumpspool,

PEM-count temp: vac envelope temp at the top of IOO chamber

Attachment 1: pd66tempow.jpg

Attachment 2: rga-090403scan.png

1459

Wed Apr 8 09:36:20 2009

Configuration

valve condition changed to BG to calibrate the RGA

Vacuum normal valve condition was changed to accommodate SRS-RGA calibration.

The annulus valves were closed to free TP3 to pump on the RGA

VM1 was closed to isolate the RGA from the IFO.

 
 
VM3 opened to TP3.
 
This condition is called back ground (BG) mode. It is where we can calibrate and see the RGA background without the IFO.

1462

Thu Apr 9 11:27:19 2009