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
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
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.
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
The fb40m just went out of order with status indicator number 8
It recovered on its own five minutes later.
APC Smart-UPS (uninterruptible power supply) batteries RBC12 replaced at 1Y8 vacuum rack.
Their life span were 22 months.
All suspentions are kicked up. Sus dampings and oplev servos turned off.
c1iscey and c1lsc are down. c1asc and c1iovme are up-down
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.
Kevin Vigue, our high school summer student went through the 40m specific safety traning yesterday.
I installed an improvised version of PSL output beam iris at the output periscope last week.
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.
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
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.
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.
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
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
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.
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.
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
Old -pre 6/2009 LLO DCPD 3 mm od GTRAN photodiode
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.
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.
I put POX back to it's place with markers. The pd was removed from it's base so it is for sure misaligned.
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
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.
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
FSS_RMTEMP is moving up and daily fluctuations are less . 120 and 16 days plots are below.
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.
Earthquake of magnitude 5.0 shakes ETMY loose.
MC2 lost it's damping later.
The EQ did not change the input beam pointing. All back to normal, except MC2 wachdogs tripped again.
Awesome 5 hrs of locking Rob!
Pointing stability of 4 days. Initial pointing does not go through suspended optics. It is launched right after the Piezo Jena steering mirrors in the BS chamber.
IP-ANG on epics screen is C1:ASC-IBQPD_X and Y in dataviewer were recentered. This beam is clipping a bit in ETMX chamber pick off mirror.
IP-POS pick off is in the BS chamber and it's qpd on the BS_ISCT This beam is also clipping just a little bit. This is easy to fix. We'll have to remove an iris from the BS optical levers table.
note: arms were not locked when I recentered
Kiwamu, Alex and Zach are practicing mandatory IR-safety scan at the 40m-PSL
40m specific safety indoctrination were completed.
Initial pointing beam is clearly clipping on 2" pick off mirror in ETMX vacuum chamber.
Atm. 1 The pick off mirror is just north west of the ETMX test mass
Atm. 2 The camera is looking in from the north view port of ETMX chamber. The back side of pick off mirror is visible now with the face view of the "IP-ANG-OUT" mirror.
IP-ANG clipping can be traced back to our last vent of Aug. 18, 2008 See elog entry #845
This was an after earth quake - sus repair vent
Pump down #66 is 435 days old. RGA scan is normal. New maglev is fine. New UPS is in place but not hooked up to communicate.
V1 has bare minimum interlock. Pirani vacuum gauges PTP1 and PRP do not communicate with readout system.
There is no emergency dial out in case of vacuum loss. Our existing vacuum dedicated desk top computer is dead.
New cold cathodes, Pirani gauges and gauge controller should be added.
In general: vacuum system needs an upgrade !
The laser power is down 5-6%
The PMC power is seems to be on the rise, ( MOPA_AMPMON is dropping ?) but I do not think it is real. We have Santa Anna wind condition, when the relative humidity drops and ......
There is an other funky think. The room temp became rock solid. The PSL HEPAs running at 20% and IFO-room ACs are also in normal operational mode.
Illuminators and PSL lights turned off.
HEPA filter speed increased from 20 to 100%
Here is the plots for the powers. MC TRANS is still rising.
What I noticed was that C1:PSL-FSS_PCDRIVE nolonger hit the yellow alert.
The mean reduced from 0.4 to 0.3. This is good, at least for now.
Koji did a nice job increasing light power with some joggling.
The RFMnetwork is down. MC2 sus damping restored.
The PSL enclosure HEPAs turned on at 30%
MC2 damping restored, MZ locked and the arms are flashing now.
RFAMPD_DCMON disappered on Nov 5, 2009
The concrete floor cutting has begun next door at CES
ATM1: Seismometers are saturating, suspensions are OK
Atm2 : activity next door, diesel Backhoe and diesel concrete cutter are running
Atm3: CES exhaust fans output is pick up by 40M-Annex-North AC unit intake. The 40m office room has some diesel smell...........see # 2377
I added ~500 cc of distilled water to the laser chiller yesterday.