ID |
Date |
Author |
Type |
Category |
Subject |
1572
|
Sun May 10 13:41:17 2009 |
steve | Update | VAC | ETMY damping restored, VC1 opened |
ETMY damping restored.
Cryo interlock closed VC1 ~2 days ago. P1 is 6.3 mTorr. Cryo temp 12K stable, reset photoswitch and opened VC1 |
1573
|
Mon May 11 11:49:20 2009 |
steve | Update | PSL | MOPA cooling water lines are backwards |
Quote: | This is 8 days of 10-minute trend.
DTEC is just the feedback control signal required to keep the NPRO's pump diode at a constant temperature.
Its not the amplifier or the actual NPRO crystal's temperature readout.
There is no TEC for the amplifier. It looks like to me that by opening up the flow to the NPRO some more
we have reduced the flow to the amplifier (which is the one that needs it) and created these temperature
fluctuations.
What we need to do is choke down the needle valve and ream out the NPRO block. |
I have measured the "input" line temp at the MOPA box 10 C and the "out" line 8 C
This must be corrected.
However look at the 80 days plot of operation where the head temp variation is nothing new |
1586
|
Thu May 14 15:28:28 2009 |
steve | Summary | SUS | April 24 earthquake effect on MC2 |
Quote: |
Quote: | The MC side problem could also be the side tramp unit problem. Set the tramp to 0 and see if that helps. |
This started around April 23, around the time that TP1 failed and we switched to the cryopump, and also when there was a mag 4 earthquake in LA. My money's on the EQ. But I don't know how. |
Only MC2 moved in this earth quake. Was the MC alignment touched up since than?
Have you guys swapped satellite amp of MC3 yet? |
1604
|
Tue May 19 09:34:29 2009 |
steve | Configuration | VAC | IFO is not pumped & CRYO is being regenerated |
Morning Vacuum condition: IFO is not being pumped, P1 pressure is 1.8 mTorr and rising (see P1 pressure plot of 100 min ).
Overnight the RGA protection software interlock at closed the VM1 valve triggering on CC1 = 1e-5 torr.
This interlock blocked our attempt to hold the IFO operational pressure in the high 1e-5 Torr range with one small
"beer can" turbopump (Varian V70D drag-turbo pumping speed for N2 is ~60 l/s at 75KRPM).
I started CRYO regeneration using TP3. Pressure readout on the P3 gauge. This is after 30 days of CRYO operation.
V5 was closed for 60 sec to see the outgassing rate of the cryopump surfaces. It was good (but I am not going to elog
what 'good' actually means - instead I will write it in my paper logbook to prevent others from learning). I will now'
go start cooling down the cryo pump.
** translated into English by Rana |
1607
|
Tue May 19 15:57:07 2009 |
steve | Update | IOO | MC2 damping restored after EQ |
Earthquake mag 4.0 at Lennox, Ca trips MC2 watchdogs http://quake.usgs.gov/recenteqs/Quakes/ci10411545.html
See 40m accelerometers as they see it. |
1609
|
Tue May 19 16:18:45 2009 |
steve | Configuration | VAC | IFO pressure is 4.2e-7 Torr with CRYO pump |
Quote: | Morning Vacuum condition: IFO is not being pumped, P1 pressure is 1.8 mTorr and rising (see P1 pressure plot of 100 min ).
Overnight the RGA protection software interlock at closed the VM1 valve triggering on CC1 = 1e-5 torr.
This interlock blocked our attempt to hold the IFO operational pressure in the high 1e-5 Torr range with one small
"beer can" turbopump (Varian V70D drag-turbo pumping speed for N2 is ~60 l/s at 75KRPM).
I started CRYO regeneration using TP3. Pressure readout on the P3 gauge. This is after 30 days of CRYO operation.
V5 was closed for 60 sec to see the outgassing rate of the cryopump surfaces. It was good (but I am not going to elog
what 'good' actually means - instead I will write it in my paper logbook to prevent others from learning). I will now'
go start cooling down the cryo pump.
** translated into English by Rana |
The Cryo cooled down to ~12K by noon.Photo switch was reset and VC1 was opened at 2pm
The VACMONITOR.adl screen is not working. Someone made some improvement on it last night. |
1612
|
Wed May 20 09:55:18 2009 |
steve | Update | PEM | oplev servos turned off |
All oplevs servos turned off to protect our suspentions from vibration due to drilling and pounding in CES high bay area.
This activity will be done from 10 am till 3 pm today.
Meanwhile our IFO-air conditions are turned off for maintenance.
Their performance of 6 months is shown on plot. |
1613
|
Wed May 20 10:43:17 2009 |
steve | Omnistructure | Environment | accelerometers sensitivity |
Quote: |
2009 May 18 03:39:36 UTC
Earthquake Details
Magnitude |
5.0 |
Date-Time |
- Monday, May 18, 2009 at 03:39:36 UTC
- Sunday, May 17, 2009 at 08:39:36 PM at epicenter
|
Location |
33.940°N, 118.338°W |
Depth |
13.5 km (8.4 miles) |
Region |
GREATER LOS ANGELES AREA, CALIFORNIA |
Distances |
- 2 km (1 miles) E (91°) from Lennox, CA
- 2 km (1 miles) SSE (159°) from Inglewood, CA
- 3 km (2 miles) NNE (22°) from Hawthorne, CA
- 7 km (4 miles) ENE (72°) from El Segundo, CA
- 15 km (10 miles) SSW (213°) from Los Angeles Civic Center, CA
|
Location Uncertainty |
horizontal +/- 0.4 km (0.2 miles); depth +/- 0.9 km (0.6 miles) |
Parameters |
Nph=139, Dmin=7 km, Rmss=0.42 sec, Gp= 40°,
M-type=local magnitude (ML), Version=C |
Source |
|
Event ID |
ci10410337 |
|
Wilcoxon 731A seismic accelerometers and Guralp CMG-40T-old seismometer at magnitude 5 and 4 erthquakes |
1614
|
Wed May 20 16:03:52 2009 |
steve | Omnistructure | Environment | using OSEMs to look at seismic activity |
Rana suggested using OSEM sensing voltages as guide lines to look seismic activity.
As you see todays drilling and tumping activity was nothing compared to the EQ of mag 5 and 4
Optic level servos are turned back on.
What Steve means is that there is some drilling going on in the CES shop to accomodate the new water flume group. We want to
make sure that the mirrors don't move enough to break the magnets. On the dataviewer we should look to make sure that the
sensor channels stay between 0-2 V. -Rana
|
1630
|
Thu May 28 18:41:26 2009 |
steve | Update | PSL | the saga of the chiller is ending |
I drained the water and removed side covers from the Neslab RTE 140 refrigerated water cooler unit this morning. The hoses to the laser were disconnected.
This abled you to see the little window of refregerant R404A was free of bubles, meaning: no recharge was needed.
The circulator bath was refilled with 7 liters of Arrowhead distilled water and the unit was turned on.
The water temp was kept 20.00+- .05C without any load. Finally the AC-repair man Paul showed up.
He measured the R404A level to be as specified: 23-24 PSI on the suction side and 310 PSI on the discharge side.
The unit was working fine. Paul found an intermittently functioning starting capacitor on the compressor that was removed.
The 240 micro Farad 120VAC cap will arrive tomorrow |
1631
|
Fri May 29 18:57:09 2009 |
steve | Update | PSL | the laser is back |
Steve, Rob and Alberto
Starting capacitor 216 miroFarad was installed on the compressor. Water lines were connected to the MOPA as corrected, so the flow meter readings are logical.
Now IN means flowing water in the direction of black arrow on the hose.
We struggled with the Neslab presetting: temp, bauds rate and other unknowns till Rob found the M6000 manual on Peter king's website.
Alberto realized that the chiller temp had to be reset to 20C on water chiller.
I put 1mg of Chloramin T into the water to restrict the growth of algae in the bath.
The NPRO heat sink was around ~20C without flow meter wheel rotation and the PA body ~25C by touch of a finger
I just opened up the needle valve a litle bit so the flow meter wheel would started rotating slowly.
That small glitch at the end of this 3 hrs plot shows this adjustment. |
1651
|
Thu Jun 4 15:53:15 2009 |
steve | Update | PSL | NPRO cooling flowrate adjusted |
The Neslab chiller is working well. It's temp display shows 20.0 C rock solid. Flow meter rotating at 13.5Hz at the out put of the chiller.
The MOPA temp was measured with a hand held thermocouple . The PA was 34 C and 29 C at NPRO heat sink.
The NPRO flow meter was not rotating at this time. There was just trickeling water flow though the meter.
I closed the needle valve this point. It needed 8 turns clockwise. This drives head temp to 19.9 C
Than I opened the needle valve 9 turns and the flow meter wheel was rotaing at ~ 1 Hz
We gained a little power. Can you explain this?
|
1665
|
Wed Jun 10 09:06:12 2009 |
steve | Update | PEM | particle counts and turbulance |
I moved the mobile HEPA filter from ITMX's north door to ITMX-ISCT and covered it up with a merostate tent to accommodate the aluminum foil particle measurement on June 5
It lowered the 40m baseline counts by about a factor of 3 of 0.5 micron and a factor of 2 of 1.0 micron.
The HEPA filter is sweeping the floor and blowing the particles upwards. The MET ONE counter is on the top of the IOOC looking south at ~75 degrees upward.
|
1666
|
Wed Jun 10 09:28:14 2009 |
steve | Update | PSL | PMC |
The PMC alarm was on this morning. It was relocked at lower HV
The FSS_RMTEMP jumped 0.5 C so The PZT was compensating for it.
|
1671
|
Fri Jun 12 09:56:38 2009 |
steve | Configuration | VAC | new maglev installed |
Joe and Steve
The retrofitted Osaka 390 was installed on the pumpspool yesterday.
V1 gate valve is disabled for safety by disconnected pneumatic power plug.
The foreline of this maglev now have a KF25 size viton o-ring directly on the turbo.
This is bad for leak hunting.
Joe is ready with new interface cable. Power supply and cables are in place.
The maglev was pumped down this morning.
All new gas kits and metal hose were leak checked by sprayed methanol.
There is no obvious sign of leak. I was expecting the pressure to drop below 1e-5 Torr in one hour.
TP2 is drying out the levitating coils of the turbo at ~7 l/s for N2
We'll start the pump as soon as Joe is in.
|
1672
|
Fri Jun 12 15:34:49 2009 |
steve | Configuration | VAC | maglev is running |
Quote: |
Joe and Steve
The retrofitted Osaka 390 was installed on the pumpspool yesterday.
V1 gate valve is disabled for safety by disconnected pneumatic power plug.
The foreline of this maglev now have a KF25 size viton o-ring directly on the turbo.
This is bad for leak hunting.
Joe is ready with new interface cable. Power supply and cables are in place.
The maglev was pumped down this morning.
All new gas kits and metal hose were leak checked by sprayed methanol.
There is no obvious sign of leak. I was expecting the pressure to drop below 1e-5 Torr in one hour.
TP2 is drying out the levitating coils of the turbo at ~7 l/s for N2
We'll start the pump as soon as Joe is in.
|
Joe and Steve
The Maglev is running at 680 Hz, 40,800 RPM with V1 gate valve closed and valve disabled to change position. C1vac2 was rebooted before starting.
Interlocks are not tested yet, but the medm COVAC_MONITOR.adl screen is reading correctly. RGA scan will determine the need for baking on Monday
The foreline pressure is still ~2e-5 Torr
Acceleration takes 3 minutes 30sesconds without load. There is no observabale temp effect on the body of the turbo during braking and acceleration.
The IFO is still pumped by the CRYO only |
1674
|
Mon Jun 15 16:31:36 2009 |
steve | Configuration | VAC | RGA is scanning new Maglev |
Quote: |
Quote: |
Joe and Steve
The retrofitted Osaka 390 was installed on the pumpspool yesterday.
V1 gate valve is disabled for safety by disconnected pneumatic power plug.
The foreline of this maglev now have a KF25 size viton o-ring directly on the turbo.
This is bad for leak hunting.
Joe is ready with new interface cable. Power supply and cables are in place.
The maglev was pumped down this morning.
All new gas kits and metal hose were leak checked by sprayed methanol.
There is no obvious sign of leak. I was expecting the pressure to drop below 1e-5 Torr in one hour.
TP2 is drying out the levitating coils of the turbo at ~7 l/s for N2
We'll start the pump as soon as Joe is in.
|
Joe and Steve
The Maglev is running at 680 Hz, 40,800 RPM with V1 gate valve closed and valve disabled to change position. C1vac2 was rebooted before starting.
Interlocks are not tested yet, but the medm COVAC_MONITOR.adl screen is reading correctly. RGA scan will determine the need for baking on Monday
The foreline pressure is still ~2e-5 Torr
Acceleration takes 3 minutes 30sesconds without load. There is no observabale temp effect on the body of the turbo during braking and acceleration.
The IFO is still pumped by the CRYO only
|
The new Maglev fore line pressure is at 4e-6 torr at day 3
Valve VM1 was closed to isolate IFO from RGA and valve VM2 was opened so the RGA can scan the Maglev only.
|
1677
|
Tue Jun 16 09:02:30 2009 |
steve | Configuration | VAC | new maglev RGA scan |
The maglev fore line pressure is 3e-6 torr at CC2 after 4 days of pumping. Varian turbo V-70 is pumping on it through V4 and VM2
Actual pumping speed ~10 l/s for N2. There was no baking. The maglev performance looks good : 3e-9 torr on CC4 with RGA -region only. |
1690
|
Tue Jun 23 10:06:03 2009 |
steve | Update | VAC | new maglev RGA scan at day6 |
The Maglev is running for 10 days with V1 closed. The pressure at the RGA-region is at 2e-9 torr on CC4 cold cathode gauge.
Valve VM2 to Rga-only was opened 6 days ago. The foreline pressure is still 2.2e-6 torr with small Varian turbo ~10 l/s on cc2
Daily scans show small improvement in large amu 32 Oxygen and large amu 16, 17 and 18 H20 water peaks.
Argon calibration valve is leaking on our Ar cylinder and it is constant.
The good news is that there are no fragmented hydrocarbons in the spectrum.
The Maglev is soaked with water. It was seating in the 40m for 4 years with viton o-ring seals
However I can not explan the large oxygen peak, either Rai Weiss can not.
The Maglev scans are indicating cleanliness and water. I'm ready to open V1 to the IFO |
1691
|
Tue Jun 23 15:19:42 2009 |
steve | Configuration | VAC | V1 is open |
Quote: |
The Maglev is running for 10 days with V1 closed. The pressure at the RGA-region is at 2e-9 torr on CC4 cold cathode gauge.
Valve VM2 to Rga-only was opened 6 days ago. The foreline pressure is still 2.2e-6 torr with small Varian turbo ~10 l/s on cc2
Daily scans show small improvement in large amu 32 Oxygen and large amu 16, 17 and 18 H20 water peaks.
Argon calibration valve is leaking on our Ar cylinder and it is constant.
The good news is that there are no fragmented hydrocarbons in the spectrum.
The Maglev is soaked with water. It was seating in the 40m for 4 years with viton o-ring seals
However I can not explan the large oxygen peak, either Rai Weiss can not.
The Maglev scans are indicating cleanliness and water. I'm ready to open V1 to the IFO
|
V1 valve is open to IFO now. V1 interlock will be tested tomorrow.
Valve configuration: VAC NORMAL with CRYO and Maglev are both pumping on the IFO |
1693
|
Wed Jun 24 09:21:19 2009 |
steve | Configuration | VAC | IFO RGA scan with Maglev & Cryo |
Quote: |
Quote: |
The Maglev is running for 10 days with V1 closed. The pressure at the RGA-region is at 2e-9 torr on CC4 cold cathode gauge.
Valve VM2 to Rga-only was opened 6 days ago. The foreline pressure is still 2.2e-6 torr with small Varian turbo ~10 l/s on cc2
Daily scans show small improvement in large amu 32 Oxygen and large amu 16, 17 and 18 H20 water peaks.
Argon calibration valve is leaking on our Ar cylinder and it is constant.
The good news is that there are no fragmented hydrocarbons in the spectrum.
The Maglev is soaked with water. It was seating in the 40m for 4 years with viton o-ring seals
However I can not explan the large oxygen peak, either Rai Weiss can not.
The Maglev scans are indicating cleanliness and water. I'm ready to open V1 to the IFO
|
V1 valve is open to IFO now. V1 interlock will be tested tomorrow.
Valve configuration: VAC NORMAL with CRYO and Maglev are both pumping on the IFO
|
The IFO RGA scan is normal.
The Cryo needs to be regenerated next. It has been pumping for 36 days since last regenerated.
This has to be done periodically, so the Cryo's 14 K cold head is not insulated by by ice of all things pumped away from the IFO |
1700
|
Wed Jun 24 17:08:16 2009 |
steve | Bureaucracy | SAFETY | surf student safety |
The 40m lab specific safety training is done. The participants were
Stephanie Erickson, Clara Bennett, Chris Zimmerman, Zach Commings, Michelle Stephen surfs and Drew Cappel postock.
They have already went through the Caltech Safety Office laser and general safety training.
They still have to read, understand and sign the the SOP for the laser & lab |
1701
|
Thu Jun 25 10:28:58 2009 |
steve | HowTo | VAC | Cryopump is regenerated |
The Cryopump's VC1 valve to IFO was closed yesterday.
The compressor Helium pressure was 235 PSI. The cold head temp on H2 vapor pressure gauge was reading ~14 Kelvin,
The compressor and piston driver were turned off to let cold head warm up to room temp.
The flow path from Cryo to TP3 were checked to insure that only VC2 and V5 would be open for pumping.
VC2 valve was opened to TP3 through V5
Now as the Cryo was warming up while TP3 drag turbo pump was pumping away the accumulated ice, that was melting and vaporizing.
This is shown on one day the plot below.
To check outgassing rate of the Cryo pump after one day of pumping V5 was closed for 20 minutes.
The accumulation was 1.3 mTorr in 20 min
This means the Cryo is clean, it is ready to be started up in the future.
VC2 was closed to seal this condition.
The flow path between VC2, VM3, V7, V6 , VA6 and manual needle valve would be pumped for one day through V5 to TP3 to clean up |
1716
|
Thu Jul 2 17:37:36 2009 |
steve | Update | VAC | V1 interlock test |
Joe, Alberto and Steve
We tested gate valve V1 interlock by :
1, decelerated rotation by brake from maglev controller unit.
2, turned maglev controller off from controller unit.
3, unpluged 220VAC plug from wall socket
None of the above action triggered V1 to close. This needs to be corrected in the future.
The MEDM monitor screen of maglev indicated the correct condition changes.
|
1743
|
Tue Jul 14 14:54:19 2009 |
steve | Configuration | Computers | fb40m2 in 1Y6 |
Alex and Steve,
SunFire x4600 ( not MEGATRON 2 , it is fb40m2 ) and JetStor ( 16 x 1 TB drives ) were installed on side rails at the bottom of 1Y6
We cleaned up the fibres and cabling in 1Y7 also |
1746
|
Wed Jul 15 08:59:30 2009 |
steve | Update | Computers | fb40m |
The fb40m just went out of order with status indicator number 8
It recovered on its own five minutes later. |
1763
|
Mon Jul 20 10:35:06 2009 |
steve | Update | VAC | UPS batteries replaced |
APC Smart-UPS (uninterruptible power supply) batteries RBC12 replaced at 1Y8 vacuum rack.
Their life span were 22 months. |
1771
|
Tue Jul 21 18:46:47 2009 |
steve | Configuration | Computers | computers are down |
All suspentions are kicked up. Sus dampings and oplev servos turned off.
c1iscey and c1lsc are down. c1asc and c1iovme are up-down |
1795
|
Mon Jul 27 09:34:07 2009 |
steve | Summary | IOO | Aligning the mode cleaner |
Quote: |
I set the MC back to its good alignment (June 21st) using this procedure. The trend of the OSEM values over the last 40 days and 40 nights is attached.
Then I aligned the periscope to that beam. This took some serious periscope knob action. Without WFS, the transmission went to 2.7 V and the reflection down to 0.6V.
Then I re-aligned the MC_REFL path as usual. The beam was far enough off that I had to also re-align onto the MC LSC PD as well as the MC REFL camera (~2 beam radii).
Beams are now close to their historical positions on Faraday and MC2. I then restored the PZT sliders to their April snapshot and the X-arm locked.
Steve - please recenter the iris which is on the periscope. It has been way off for a long time.
So it looks OK now. The main point here is that we can trust the MC OSEMs.
Afterwards I rebooted c1susvme1 and c1susvme2 because they were skewed.
|
I'm impressed by Rana's simple way to align the MC. IFO arms are locked or flashing. 20 days trend attached.
|
1802
|
Wed Jul 29 11:15:06 2009 |
steve | Bureaucracy | SAFETY | Kevin receives safety training |
Kevin Vigue, our high school summer student went through the 40m specific safety traning yesterday. |
1831
|
Wed Aug 5 07:33:04 2009 |
steve | DAQ | Computers | fb40m is down |
|
1838
|
Wed Aug 5 16:33:50 2009 |
steve | Configuration | PSL | new PSL output iris |
I installed an improvised version of PSL output beam iris at the output periscope last week. |
1840
|
Thu Aug 6 09:05:29 2009 |
steve | Update | VAC | large O-rings of vacuum envelope |
The 40m-IFO vacuum envelope doors are sealed with dual viton O-rings and they are pumped through the annulos lines.
This allows easy access into the chambers. The compression of the o-rings are controlled by the o-ring grooves.
The OOC (output optic chamber)'s west side door has no such groove and it is sealed by just one single O-ring.
We have to protect this O-ring from total compression by 3 shims as shown below.
There were control shims in place before and they disappeared.
Let's remember that these shims are essential to keep our vacuum system in good condition.
|
1852
|
Fri Aug 7 09:50:57 2009 |
steve | Configuration | VAC | IFO pressure rose to 2.3 mTorr |
IFO pressure was 2.3 mTorr this morning,
The Maglev's foreline valve V4 was closed so P2 rose to 4 Torr. The Maglev was running fine with V1 open.
This is a good example for V1 to be closed by interlock, because at 4 Torr foreline pressure the compression ratio for hydrocarbones goes down.
V4 was closed by interlock when TP2 lost it's drypump. The drypump's AC plug was lose.
To DO: set up interlock to close V1 if P2 exceeds 1 Torr |
1864
|
Fri Aug 7 19:34:40 2009 |
steve | Summary | VAC | UPS failed |
The Maglev is running on single phase 220V and that voltage was not interrupted. TP1 was running undisturbed with V1 and V4 closed.
It is independent of the UPS 120V. |
1865
|
Fri Aug 7 19:55:08 2009 |
steve | Summary | VAC | opening V1 when PTP1 is broken |
The swapped in 307 convectron gauge controller is very likely to have the RS232 connection wired differently from the old one.
PRP gauge has now the same error message as the PTP1: "no comm" I would look at RS232 wiring of the PRP gauge on the broken
controller and adapt the swapped in one to communicate. The PRP was reading 620 Torr before the swap. |
1931
|
Thu Aug 20 09:16:32 2009 |
steve | HowTo | Photos | Control Room Workstation desks lowered to human height |
Quote: |
There were no injuries...Now we need to get some new chairs.
|
The control room desk tops heights on the east side were lowered by 127 mm
|
1937
|
Mon Aug 24 16:48:57 2009 |
steve | HowTo | VAC | new UPS installed |
Quote: |
As Rob noted last Friday, the UPS which powers the Vacuum rack failed. When we were trying to move the plugs around to debug it, it made a sizzling sound and a pop. Bad smells came out of it.
Ben came over this week and measured the quiescent power consumption. The low power draw level was 11.9 A and during the reboot its 12.2 A. He measured this by ??? (Rob inserts method here).
So what we want is a 120 V * 12.2 A ~ 1.4 kVA UPS with ~30-50% margin. We look for this on the APC-UPS site:
On Monday, we will order the SUA2200 from APC. It should last for ~25 minutes during an outage. Its $1300. The next step down is $200 cheaper and gives 10 minutes less uptime.
|
The new APC Smart -UPS 2200VA is now running at the vacuum rack. There are 2 load monitoring leds on out of 5
Maglev, dry pumps and roughing pumps are not using UPS.
The switch over went smoothly with Yoichi's help.
First we closed all vacuum valves and stopped the two small turbos.
Than turned power off to instruments in the vac-rack and VME: c1vac1 & c1vac2
Maglev was left running.
Now we moved the AC plugs from the wall receptacles over to the back of the UPS and powered them up.
Varian turbos were restarted and vacuum valves were restored in order to reach vacuum normal condition.
See 40m Vacuum System States and Sequences Manual of 10-24-2001
Linux 3 desk top computer is out of order at the pump spool. We should replace it.
The vacuum control screen can be pulled up on a lap top: /cvs/cds/caltech/medm/c0/ve/VacControl_BAK.adj
|
1943
|
Tue Aug 25 18:42:42 2009 |
steve | Update | PSL | reference cavity temp box temporarly out of order |
Quote: |
The PSL Temperature Box (D980400-B-C, what kind of numbering scheme is that?) modified at LHO/LLO ~8 years ago to have better resolution on the in-loop temperature sensors.
I haven't been able to find a DCN / ECN on this, but there's an elog entry from Hugh Radkins here. I'm also attaching the PDF of the latest drawing (circa 2000) from the DCC.
The schematic doesn't show it, but I am guessing that the T_SENSE inputs are connected to the AD590 chips, and that 4 of these are attached somehow to the RefCav can. IF this is true, I don't understand why there are input resistors on the LT1125 of U1; the AD590 is supposed to be a current source ?
Peter King is supposed to be coming over to work on this today so whoever spots him should force/cajole/entice him to elog what he's done. Film him if necessary.
I also think R1-8 should be swapped into metal film resistors for stability. The datasheet says that it puts out 1 uA/K, so the opamps put out 10 mV/K.
J8 and JP1 should be shorted to disable both the tidal and VME control input. Both are unused and a potential source of drift.
|
Peter King is updating our temp box as Hugh did at Hanford Oct.22 of 2001 I still have not seen an updated drawing of this.
The LT 1021-7 reference chip will arrive tomorrow morning. This modification should be completed by noon.
** The link to the DCN from Hugh is here in the DCC. |
1948
|
Wed Aug 26 14:45:14 2009 |
steve | Update | PSL | PSL-FSS_RCTEMP of 4 years |
The reference cavity vacuum chamber temp is plotted starting Feb 22 of 2005
This plot suggest that the MINCO temp controller is not working properly. |
1952
|
Wed Aug 26 16:31:34 2009 |
steve | Update | PSL | reference cavity temp box temporarly out of order |
Quote: |
It turned out that half an hour was too long. In less than that the reference cavity temperature passed the critical point when the temperature controller (located just below the ref cav power supply in the same rack) disables the input power to the reference cavity power supply.
The controller's display in the front shows two numbers. The first goes with the temperature of the reference cavity; the second is a threshold set for the first number. The power supply gets enabled only when the first number comes under the threshold value.
Now the cavity is cooling down and it will take about another hour for its temperature to be low enough and for the heater power supply to be powered.
|
The cavity temp cooled below SP2 set point 0.1 The Minco SP1 (present temp in Volts) now reading -0.037 so DC power supply was turned on and set to 12V 1A
|
1958
|
Thu Aug 27 16:14:28 2009 |
steve | Summary | OMC | burned photodiode |
Old -pre 6/2009 LLO DCPD 3 mm od GTRAN photodiode |
1961
|
Fri Aug 28 15:30:15 2009 |
steve | Configuration | General | POX rfpd removed |
I removed POX rfpd to see how it is mounted on its base. It is here on the work bench just in case someone wants to use it the IFO over the week end. |
1962
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Tue Sep 1 11:23:36 2009 |
steve | Update | General | electrical ground |
I was told yesterday, that on Friday the construction people accidentally ripped out one of the 40m soil ground.....AND HOW MANY MORE ARE THERE? nobody knows.
It was ~8 ft long and 0.5" diameter buried in the ground. There is no drawing found to identify this exact building ground. They promised to replace this on Wednesday with a 10 ft long and 0.75" diameter.
The the wall will be resealed where the conduit enters the north west corner of the IFO room 104
There should be no concern about safety because the 40m building main ground is connected to the CES Mezzanine step-down transformer. |
1963
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Tue Sep 1 13:52:06 2009 |
steve | Configuration | General | POX rfpd is back & needs alignment |
Quote: |
I removed POX rfpd to see how it is mounted on its base. It is here on the work bench just in case someone wants to use it the IFO over the week end.
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I put POX back to it's place with markers. The pd was removed from it's base so it is for sure misaligned. |
1965
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Thu Sep 3 11:20:26 2009 |
steve | Update | General | electrical ground in place |
Quote: |
I was told yesterday, that on Friday the construction people accidentally ripped out one of the 40m soil ground.....AND HOW MANY MORE ARE THERE? nobody knows.
It was ~8 ft long and 0.5" diameter buried in the ground. There is no drawing found to identify this exact building ground. They promised to replace this on Wednesday with a 10 ft long and 0.75" diameter.
The the wall will be resealed where the conduit enters the north west corner of the IFO room 104
There should be no concern about safety because the 40m building main ground is connected to the CES Mezzanine step-down transformer.
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Atm1 is showing ground bus under N-breaker panel in 40m IFO room north-west corner.
The second ground bus is visible farther down south under M-breaker panel.
Atm2 is the new ground that will be connected to ground bus-N |
1974
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Tue Sep 8 16:01:52 2009 |
steve | Configuration | VAC | RGA was separeted from IFO |
The RGA isolation valve VM1 was closed since Aug 24, 2009 I installed the new UPS that time.
The last RGA scan in the log is from Aug 7, 2009 The vacuum rack UPS failed on Aug 15, 2009
I opened VM1 today so we can have ifo rga scan tomorrow.
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1980
|
Wed Sep 9 10:13:31 2009 |
steve | Bureaucracy | General | the use of FAX machine, scanner & toaster |
You said that the use of FAXST was forbidden for phds and graduate students. I had to swear on the promise of not ever buying an other FAXST |
1987
|
Tue Sep 15 15:46:05 2009 |
steve | Update | PEM | PEM and VAC |
FSS_RMTEMP is moving up and daily fluctuations are less . 120 and 16 days plots are below. |
1993
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Fri Sep 18 16:26:02 2009 |
steve | Summary | PSL | Neslab chiller is OK |
Rob found puddles of water very close to the chiller during lunch time. We raised the unit and took the side cover off. All surfaces were dry and the water level in the tub normal.
Later on we discovered that one of the Vons distilled water bottle was leaking. Jenne and I checked for excess amount of condensing water droplets inside the MOPA box.
On the bare,not insulated tubing and valve are loaded with droplets of water. Relative humidity is 44% at 24 C and HEPA filter speed set to 80 V in the enclosure.
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