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  40m Log, Page 326 of 344  Not logged in ELOG logo
ID Date Author Typedown Category Subject
  1602   Mon May 18 20:16:20 2009 ranaConfigurationVACnot it
There was essentially no change in the ETMY oplev spectrum with the cryo off!

So I went out to the ETMY OL table to see what else was going on. I found there one of
the most horrible opto-mechanical setups
I have ever seen (and remember that I have once
seen someone mount an NPRO on a cardboard box). Some bad person had mounted the ETMY OL
lens on a 12" long skinny post and extended it towards the viewport. So there was a post
holder on the table and a lens ~12" away on a rickety lever arm.

I took this lens away and the spectrum is now good. Shame on you.
CYAN -  cryo ON
BLACK - cryo OFF
BLUE -  no crappy lens + mount

This OL needs to be fixed correctly by putting in a proper lens to get a small spot on the QPD.
Attachment 1: a.png
a.png
  1603   Mon May 18 21:34:18 2009 ranaConfigurationSUSETMY f2pRatio script run
Now that the ETMY optical lever is not so bad, I ran the f2pRatio script and it seems to have worked.

I cleaned up the script a little also. Updated in the SVN.

ETMY's A2L scripts have to be run to reduce the A2L noise once the arm is locked again. Might also need
to set the OL UGF too.
  1604   Tue May 19 09:34:29 2009 steveConfigurationVACIFO 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
Attachment 1: cryoreg.jpg
cryoreg.jpg
Attachment 2: cryo30d.jpg
cryo30d.jpg
  1605   Tue May 19 12:30:41 2009 robConfigurationSUSETMY f2pRatio script run

Quote:
Now that the ETMY optical lever is not so bad, I ran the f2pRatio script and it seems to have worked.

I cleaned up the script a little also. Updated in the SVN.

ETMY's A2L scripts have to be run to reduce the A2L noise once the arm is locked again. Might also need
to set the OL UGF too.


Just to show, in part, what the script does.

The F2A filters are turned on at 12:21, and the oplev no longer responds to large LSC drives in ETMY.
Attachment 1: f2ademo.png
f2ademo.png
  1609   Tue May 19 16:18:45 2009 steveConfigurationVACIFO 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.
  1615   Thu May 21 12:58:32 2009 robConfigurationALARMPEM count-half disabled

I've disabled the alarm for PEM_count_half, using the mask in the 40m.alhConfig file.  We can't do anything about it, and it's just annoying.

  1619   Fri May 22 00:43:24 2009 robConfigurationComputer Scripts / ProgramsIFO configure scripts for XARM and YARM

I edited the configure scripts (those called from the C1IFO_CONFIGURE screen) for restore XARM and YARM.  These used to misalign the ITM of the unused arm, which is totally unnecessary here, as we have both POX and POY.  They also used to turn off the drive to the unused ETM.  I've commented out these lines, so now running the two restores in series will leave a state where both arms can be locked.  This also means that the ITMs will never be deliberately mis-aligned by the restore scripts.

  1632   Sat May 30 11:24:56 2009 robConfigurationPSLNPRO slow scan

I'm setting SLOWDC to about -5.

I had to edit FSSSlowServo because it had hard limits on SLOWDC at (-5 and 5).  It now goes from -10 to 10.

 

 

Attachment 1: slowSCAN.png
slowSCAN.png
  1637   Mon Jun 1 14:33:42 2009 robConfigurationComputer Scripts / Programsop540m Monitor added to web status

I added op540m's display 0 (the northern-most monitor in the control room) to the MEDM screens webpage: https://nodus.ligo.caltech.edu:30889/medm/screenshot.html

 

Now we can see the StripTool displays that are usually parked on that screen.

 

 

  1642   Tue Jun 2 23:12:08 2009 robConfigurationComputersntp on op440m

I restarted ntpd on op440m to solve a "synchronization error" that we were having in DTT.  I also edited the config file (/etc/inet/ntp.conf) to remove the lines referring to rana as an ntp server; now only nodus is listed.

To do this:

log in as root

/usr/local/bin/ntpd -c /etc/inet/ntp.conf

  1650   Thu Jun 4 01:32:20 2009 robConfigurationLSCAS port mode scan

Here is a set of mode scans of the AS port, using the OMC as a mode scanner.  The plot overlays various configurations of the IFO.  

To remove PZT nonlinearity, each scan was individually flattened in fsr-space by polynomial (3rd order) fitting to some known peak locations (the carrier and RF sidebands).
 

Attachment 1: modes.png
modes.png
  1671   Fri Jun 12 09:56:38 2009 steveConfigurationVACnew 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.

 

 

Attachment 1: m390pd.jpg
m390pd.jpg
  1672   Fri Jun 12 15:34:49 2009 steveConfigurationVACmaglev 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

  1673   Mon Jun 15 15:17:33 2009 josephb, SteveConfigurationVACVacuum control and monitor screens

We updated the vacuum control and monitor screens  (C0VAC_MONITOR.adl and C0VAC_CONTROL.adl).  We also updated the /cvs/cds/caltech/target/c1vac1/Vac.db file.

1) We changed the C1:Vac-TP1_lev channel to C1:Vac-TP1_ala channel, since it now is an alarm readback on the new turbo pump rather than an indication of levitation.  The logic on printing the "X" was changed from X is printed on a 1 = ok status) to X is printed on a 0 = problem status.  All references within the Vac.db file to C1:Vac-TP1_lev were changed.  The medm screens also now are labeled Alarm, instead of Levitating.

2) We changed the text displayed by the CP1 channel (C1:Vac-CP1_mon in Vac.db) from "On" and "Off" to "Cold - On" and "Warm - OFF".

3) We restarted the c1vac1 front end as well as the framebuilder after these changes.

  1674   Mon Jun 15 16:31:36 2009 steveConfigurationVACRGA 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 steveConfigurationVACnew 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.

Attachment 1: nmagd4scan.jpg
nmagd4scan.jpg
Attachment 2: nmagd4.jpg
nmagd4.jpg
  1682   Wed Jun 17 01:07:50 2009 robConfigurationComputersmatapps on /cvs/cds

I checked out a copy of matapps into /cvs/cds/caltech/apps/lscsoft so that I could find the matlab function strassign.m, which is necessary for some old mDV commands to run.  I don't know why it became necessary or why it disappeared if it did.

  1686   Fri Jun 19 13:38:42 2009 AlbertoConfigurationComputerselog rebooted

Today I found the elog down, so I rebooted it following the instructions in the wiki.

  1688   Fri Jun 19 14:30:47 2009 AlbertoConfigurationComputerselog rebooted

Quote:

Today I found the elog down, so I rebooted it following the instructions in the wiki.

 I have the impression that Nodus has been rebooted since last night, hasn't it?

  1689   Sun Jun 21 00:08:26 2009 ranaConfigurationComputerselog rebooted

 

nodus:log>dmesg

Sun Jun 21 00:06:43 PDT 2009
Mar  6 15:46:32 nodus sshd[26490]: [ID 800047 auth.crit] fatal: Timeout before authentication for 131.215.114.93
Mar 10 11:11:32 nodus sshd[22775]: [ID 800047 auth.crit] fatal: Timeout before authentication for 131.215.114.93
Mar 11 13:27:37 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to 131.215.115.52 port 7000: Connection refused
Mar 11 13:27:37 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to nodus port 7000: failed.
Mar 11 13:31:40 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to 131.215.115.52 port 7000: Connection refused
Mar 11 13:31:40 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to nodus port 7000: failed.
Mar 11 13:31:45 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to 131.215.115.52 port 7000: Connection refused
Mar 11 13:31:45 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to nodus port 7000: failed.
Mar 11 13:34:58 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to 131.215.115.52 port 7000: Connection refused
Mar 11 13:34:58 nodus sshd[7768]: [ID 800047 auth.error] error: connect_to nodus port 7000: failed.
Mar 12 16:09:23 nodus sshd[22785]: [ID 800047 auth.crit] fatal: Timeout before authentication for 131.215.114.93
Mar 14 20:14:42 nodus sshd[13563]: [ID 800047 auth.crit] fatal: Timeout before authentication for 131.215.114.93
Mar 25 19:47:19 nodus sudo: [ID 702911 local2.alert] controls : 3 incorrect password attempts ; TTY=pts/2 ; PWD=/cvs/cds ; USER=root ; COMMAND=/usr/bin/rm -rf kamioka/
Mar 25 19:48:46 nodus su: [ID 810491 auth.crit] 'su root' failed for controls on /dev/pts/2
Mar 25 19:49:17 nodus last message repeated 2 times
Mar 25 19:51:14 nodus sudo: [ID 702911 local2.alert] controls : 1 incorrect password attempt ; TTY=pts/2 ; PWD=/cvs/cds ; USER=root ; COMMAND=/usr/bin/rm -rf kamioka/
Mar 25 19:51:22 nodus su: [ID 810491 auth.crit] 'su root' failed for controls on /dev/pts/2
Jun  8 16:12:17 nodus su: [ID 810491 auth.crit] 'su root' failed for controls on /dev/pts/4

nodus:log>uptime
 12:06am  up 150 day(s), 11:52,  1 user,  load average: 0.05, 0.07, 0.07

  1691   Tue Jun 23 15:19:42 2009 steveConfigurationVACV1 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

Attachment 1: V1_opennmag.jpg
V1_opennmag.jpg
  1692   Tue Jun 23 23:14:36 2009 ClaraConfigurationPEMAccelerometers relocated

Both accelerometers have been moved in an attempt to optimize their positions. The MC1 accelerometer was moved from one green bar to the other (I don't know what to call them) at the base of the MC1 and MC3 chambers. That area is pretty tight, as there is an optical table right there, and I did my best to be careful, but if you suspect something has been knocked loose, you might check in that area. The MC2 accelerometer was moved from the horizontal bar down to the metal table on which the MC2 chamber rests.

  1693   Wed Jun 24 09:21:19 2009 steveConfigurationVACIFO 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

Attachment 1: nmagd1ifo.jpg
nmagd1ifo.jpg
Attachment 2: nmagCryopres.jpg
nmagCryopres.jpg
  1743   Tue Jul 14 14:54:19 2009 steveConfigurationComputersfb40m2 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

  1764   Mon Jul 20 12:35:21 2009 robConfigurationLockingalignment biases funny

I found the alignment biases for the PRM and the SRM in a funny state.  It seemed like they had been "saved" in badly misaligned position, so the restore scripts on the IFO configure screen were not working.  I've manually put them into a better alignment.

  1771   Tue Jul 21 18:46:47 2009 steveConfigurationComputerscomputers 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

  1772   Wed Jul 22 01:57:19 2009 AlbertoConfigurationComputerscomputers are down

Quote:

All suspentions are kicked up. Sus dampings and  oplev servos turned off.

c1iscey and c1lsc are down. c1asc and c1iovme are up-down

 The computers and RFM network are up working again. A boot fest was necessary.Then I restored all the parameters with burtgooey.

The mode cleaner alignment is in a bad state. The autolocker can't get it locked. I don't know what caused it to move so far from the good state that it was till this afternoon.  I went tuning the periscope but the cavity alignment is so bad that it's taking more time than expected. I'll continue working on that tomorrow morning.

  1773   Wed Jul 22 09:04:10 2009 AlbertoConfigurationComputerscomputers are down

Quote:

Quote:

All suspentions are kicked up. Sus dampings and  oplev servos turned off.

c1iscey and c1lsc are down. c1asc and c1iovme are up-down

 The computers and RFM network are up working again. A boot fest was necessary.Then I restored all the parameters with burtgooey.

The mode cleaner alignment is in a bad state. The autolocker can't get it locked. I don't know what caused it to move so far from the good state that it was till this afternoon.  I went tuning the periscope but the cavity alignment is so bad that it's taking more time than expected. I'll continue working on that tomorrow morning.

 I now suspect that after the reboot the MC mirrors didn't really go back to their original place even if the MC sliders were on the same positions as before.

  1776   Wed Jul 22 11:14:11 2009 AlbertoConfigurationComputerscomputers are down

Quote:

Quote:

Quote:

All suspentions are kicked up. Sus dampings and  oplev servos turned off.

c1iscey and c1lsc are down. c1asc and c1iovme are up-down

 The computers and RFM network are up working again. A boot fest was necessary.Then I restored all the parameters with burtgooey.

The mode cleaner alignment is in a bad state. The autolocker can't get it locked. I don't know what caused it to move so far from the good state that it was till this afternoon.  I went tuning the periscope but the cavity alignment is so bad that it's taking more time than expected. I'll continue working on that tomorrow morning.

 I now suspect that after the reboot the MC mirrors didn't really go back to their original place even if the MC sliders were on the same positions as before.

 Alberto, Rob,

we diagnosed the problem. It was related with sticky sliders. After a reboot of C1:IOO the actual output of the DAC does not correspond anymore to the values read on the sliders. In order to update the actual output it is necessary to do a change of the values of the sliders, i.e. jiggling a bit with them.

  1777   Wed Jul 22 11:18:49 2009 robConfigurationComputerssticky sliders

Quote:

Quote:

Quote:

Quote:

All suspentions are kicked up. Sus dampings and  oplev servos turned off.

c1iscey and c1lsc are down. c1asc and c1iovme are up-down

 The computers and RFM network are up working again. A boot fest was necessary.Then I restored all the parameters with burtgooey.

The mode cleaner alignment is in a bad state. The autolocker can't get it locked. I don't know what caused it to move so far from the good state that it was till this afternoon.  I went tuning the periscope but the cavity alignment is so bad that it's taking more time than expected. I'll continue working on that tomorrow morning.

 I now suspect that after the reboot the MC mirrors didn't really go back to their original place even if the MC sliders were on the same positions as before.

 Alberto, Rob,

we diagnosed the problem. It was related with sticky sliders. After a reboot of C1:IOO the actual output of the DAC does not correspond anymore to the values read on the sliders. In order to update the actual output it is necessary to do a change of the values of the sliders, i.e. jiggling a bit with them.

 I've updated the slider twiddle script to include the MC alignment biases.  We should run this script whenever we reboot all the hardware, and add any new sticky sliders you find to the end of the script.  It's at

 

/cvs/cds/caltech/scripts/Admin/slider_twiddle

  1785   Fri Jul 24 11:04:11 2009 AlbertoConfigurationComputerselog restarted

This morning I found the elog down. I restarted it using the procedure in the wiki.

  1809   Wed Jul 29 19:31:17 2009 ranaConfigurationComputerselog restarted

Just now found it dead. Restarted it. Is our elog backed up in the daily backups?

  1810   Wed Jul 29 19:41:58 2009 ChrisConfigurationGeneralEUCLID-setup configuration change

David and I were thinking about changing the non-polarizing beam splitter in the EUCLID setup from 50/50 to 33/66 (ref picture).  It serves as a) a pickoff to sample the input power and b) a splitter to send the returning beam to a photodetector 2 (it then hits a polarizer and half of this is lost.  By changing the reflectivity to 66% then less (1/3 instead of 1/2) of the power coming into it would be "lost" at the ref photodetector 1, and on the return trip less would be lost at the polarizer (1/6 instead of 1/4).

 

 

Attachment 1: EUCLID.png
EUCLID.png
  1837   Wed Aug 5 15:57:05 2009 AlbertoConfigurationComputersPMC MEDM screen changed

I added a clock to the PMC medm screen.

I made a backup of the original file in the same directory and named it *.bk20090805

  1838   Wed Aug 5 16:33:50 2009 steveConfigurationPSLnew PSL output iris

I installed an improvised version of PSL output beam iris at the output periscope last week.

Attachment 1: psliris.png
psliris.png
  1852   Fri Aug 7 09:50:57 2009 steveConfigurationVACIFO 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

Attachment 1: tp2fpfail.jpg
tp2fpfail.jpg
  1857   Fri Aug 7 16:11:11 2009 steve, robConfigurationVACIFO pressure rose to 2.3 mTorr

Quote:

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

 

 

 

We added C1:Vac-CC1_pressure to the alarm handler, with the minor alarm at 5e-6 torr and the major alarm at 1e-5 torr.

  1867   Sat Aug 8 15:08:14 2009 ranaConfigurationPSLSMOO settings updated in psl.db and SVN updated

I have added/modified SMOO settings to all of the records in psl.db appropriately. Changes checked in to SVN.

As a reminder, you should check in to the SVN all changes you make to any of the .db files or any of the .ini files in chans.

  1877   Mon Aug 10 16:41:31 2009 AlbertoConfigurationPSLPMC Visibility

Alberto, Rana

lately we've been trying to better understand what's preventing the arm power to get high again. Last week I tuned the MZ and the PMC but we didn't gain much, if nothing at all.
Yesterday I measured the transmissivity, the reflectivity and the visibility of the PMC.
 
From the voltages at the PMC-REFL PD when the PMC was locked and when it was out of lock I estimated the cavity visibility:
V_locked = 0.42V
V_unlocked = 1.64V -> V = (V_unlocked - V_locked) / V_unlocked = 75%

With the high power meter I measured the reflected power when the PMC was unlocked and used that to obtain the calibration of the PMC-REFL PD: 1.12V/W.

Since the locked-cavity reflected power can't be directly measured with a power meter (since that would use the cavity control signal), I estimated the reflected power by the calibration of the PMC-REFL PD. Then I measured the input and the transmitted power with a high-power meter.
Result:

P_in = 1.98W ; P_trans = 1.28W ; P_refl = 0.45W

From that I estimated that the losses account to 13% of the input power.

I checked both the new and the old elogs to see if such a measurement had ever been done but it doesn't seems so. I don't know if such a value for the visibility is "normal". It seems a little low. For instance, as a comparison, the MC visibility, is equal to a few percents.

Also Rana measured the transmitted power after locking the PMC on the TEM20-02: the photodiode on the MEDM screen read 0.325V. That means that a lot of power is going to that mode.

That makes us think that we're dealing with a mode matching problem with the PMC.

  1878   Mon Aug 10 17:27:47 2009 robConfigurationLSCTRX, TRY gain

 

These are the settings which determine the transmon (eg, TRX) amplitude, and which are updated by the matchTransMon scripts.

For the X arm

 

op440m:AutoDither>tdsread C1:LSC-TRX_GAIN C1:LSC-LA_PARAM_FLT_01 C1:LSC-LA_PARAM_FLT_00
0.0023
0.155
119.775

 

For the Y arm

op440m:AutoDither>tdsread C1:LSC-TRY_GAIN C1:LSC-LA_PARAM_FLT_04 C1:LSC-LA_PARAM_FLT_03
0.00237196
-0.116
19.9809


  1892   Wed Aug 12 13:35:03 2009 josephb, AlexConfigurationComputersTested old Framebuilder 1.5 TB raid array on Linux1

Yesterday, Alex attached the old frame builder 1.5 TB raid array to linux1, and tested to make sure it would work on linux1.

This morning he tried to start a copy of the current /cvs/cds structure, however realized at the rate it was going it would take it roughly 5 hours, so he stopped.

Currently, it is planned to perform this copy on this coming Friday morning.

  1893   Wed Aug 12 15:02:33 2009 AlbertoConfigurationComputerselog restarted

In the last hour or so the elog crashed. I  have restarted it.

  1899   Thu Aug 13 22:53:48 2009 YoichiConfigurationPSLFSS nominal common gain changed, MC WFS centered

Koji, Yoichi

We found that the FSS PC feedback easily goes crazy (saturated).
It was because the common gain was too low. Probably the recent decrease of the
laser power is responsible for this.
We increased the nominal value of the common gain from 12 to 16.5.
The value was chosen just to make the PC path quiet. We should check
the FSS UGF later.
 
The MC WFS QPDs seemed off centered. So we unlocked the MC and lowered
the input power by the usual MZ half fringe technique.
Actually, the direct reflection beam was not much off the center. In anyway, we adjusted
the beam to the exact center of the QPDs.
The MC now locks fine.

 

  1901   Fri Aug 14 10:39:50 2009 josephbConfigurationComputersRaid update to Framebuilder (specs)

The RAID array servicing the Frame builder was finally switched over to JetStor Sata 16 Bay raid array. Each bay contains a 1 TB drive.  The raid is configured such that 13 TB is available, and the rest is used for fault protection.

The old Fibrenetix FX-606-U4, a 5 bay raid array which only had 1.5 TB space, has been moved over to linux1 and will be used to store /cvs/cds/.

This upgrade provides an increase in look up times from 3-4 days for all channels out to about 30 days.  Final copying of old data occured on August 5th, 2009, and was switched over on that date.

  1939   Tue Aug 25 01:27:09 2009 ranaConfigurationComputersRaid update to Framebuilder (not quite)

Quote:

The RAID array servicing the Frame builder was finally switched over to JetStor Sata 16 Bay raid array. Each bay contains a 1 TB drive.  The raid is configured such that 13 TB is available, and the rest is used for fault protection.

The old Fibrenetix FX-606-U4, a 5 bay raid array which only had 1.5 TB space, has been moved over to linux1 and will be used to store /cvs/cds/.

This upgrade provides an increase in look up times from 3-4 days for all channels out to about 30 days.  Final copying of old data occured on August 5th, 2009, and was switched over on that date.

 Sadly, this was only true in theory and we didn't actually check to make sure anything happened.

We are not able to get lookback of more than ~3 days using our new huge disk. Doing a 'du -h' it seems that this is because we have not yet set the framebuilder to keep more than its old amount of frames. Whoever sees Joe or Alex next should ask them to fix us up.

  1940   Tue Aug 25 02:37:53 2009 ranaConfigurationComputer Scripts / ProgramsFirefox 3.5 installed for 64 bit linux in apps/
Attachment 1: DSC_0620.JPG
DSC_0620.JPG
  1947   Tue Aug 25 23:16:09 2009 Alberto, ranaConfigurationComputerselog moved in to the cvs path

In nodus, I moved the elog from /export to /cvs/cds/caltech. So now it is in the cvs path instead of a local directory on nodus.

For a while, I'll leave a copy of the old directory containing the logbook subdirectory where it was. If everything works fine, I'll delete that.

I also updated the reboot instructions in the wiki. some of it also is now in the SVN.

  1950   Wed Aug 26 16:10:28 2009 Peter KingConfigurationPSLPSL reference cavity temperature box modifications

The 40m Lab reference cavity temperature box S/N BDL3002 was modified as per DCN D010238-00-C.

These were:

    R1, R2, R5, R6 was 10k now are 25.5k metal film

    R11, R14 was 10k now are 24.9k metal film

    R10, R15 was 10k now are 127k thick film - no metal film resistors available

    R22 was 2.00k now is 2.21k

    R27 was 10k now is 33.2k

    U5, the LM-336/2.5 was removed

    An LT1021-7, 7 V voltage reference was added.  Pin 2 to +15V, pin 4 to ground, pin 6 to U6 pin 3.

    Added an 8.87k metal film resistor between U6 pin 1 and U4 pin 6.

    Added an 8.87k metal film resistor between U6 pin 1 and U4 pin 15.

    The 10k resistor between J8 pin 1 and ground was already added in a previous modification.

In addition R3, R4, R7, R8, R12 and R13 were swapped out for metal film resistors of the same value

(1.00k).

    The jumper connection to the VME setpoint was removed, as per Rana's verbal instructions.

This disables the ability to set the reference cavity vacuum chamber temperature by computer.

 DSC_0731.jpg

 

 

  1953   Wed Aug 26 16:35:03 2009 AlbertoConfigurationPSLPSL reference cavity temperature box modifications

Basically, in addition to the replacement of the resistors with metal film ones, Peter replaced the chip that provides a voltage reference.

The old one provided about 2.5 V, whereas the new one gets to about 7V. Such reference voltage somehow depends on the room temperature and it is used to generate an error signal for the temperature of the reference cavity.

Peter said that the new higher reference should work better.

  1961   Fri Aug 28 15:30:15 2009 steveConfigurationGeneralPOX 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.

ELOG V3.1.3-