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  40m Log, Page 287 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  1422   Tue Mar 24 13:54:49 2009 JenneUpdateSUSOp Levs CenteredITMX, ITMY, BS, SRM, PRM op levs were all
recentered.  ETM's looked okay enough
to leave as-is. 
  
  1439   Sun Mar 29 13:44:27 2009 steveUpdateSUSETMY sus damping restoredETMY sus damping was found to be tripped.
It was retored.
All fluorecent light were turned
  
  1440   Sun Mar 29 17:54:41 2009 YoichiUpdateSUSMC1 drift investigation continuedThe attached plots show the trend of the MC
OSEM signals along with the voltages across
the output resistors of the bias current
 Drift1.pdf 
  1441   Mon Mar 30 09:07:22 2009 ranaUpdateSUSMC1 drift investigation continued[COLOR=chocolate]Maybe we can temporarily
just disconnect the bias and just use the
SUS sliders for bias if there's enough range?[/COLOR]
  
  1444   Mon Mar 30 13:29:40 2009 YoichiUpdateSUSMC1 drift investigation continued[quote][COLOR=chocolate]Maybe we can temporarily
just disconnect the bias and just use the
SUS sliders for bias if there's enough range?[/COLOR][/quote]
  
  1583   Wed May 13 21:15:04 2009 ranaSummarySUSChannel Hopping: That ancient enemy (MC problems)The MC side problem could also be the side
tramp unit problem. Set the tramp to 0 and
see if that helps.
  
  1584   Thu May 14 00:15:39 2009 robSummarySUSChannel Hopping: That ancient enemy (MC problems)[quote]The MC side problem could also be the
side tramp unit problem. Set the tramp to
0 and see if that helps.[/quote]
 sidemon.png 
  1586   Thu May 14 15:28:28 2009 steveSummarySUSApril 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.[/quote]
 eq042409.jpg 
  1587   Thu May 14 16:07:20 2009 peteSummarySUSChannel Hopping: That ancient enemy (MC problems)[quote][quote]The MC side problem could also
be the side tramp unit problem. Set the tramp
to 0 and see if that helps.[/quote]
 mc3_5days.jpg 
  1588   Fri May 15 00:02:34 2009 peteUpdateSUSETMX coils look OKI checked the four rear coils on ETMX by
exciting XXCOIL_EXC channel in DTT with amplitude
1000@ 500 Hz and observing the oplev PERROR
  
  1603   Mon May 18 21:34:18 2009 ranaConfigurationSUSETMY f2pRatio script runNow that the ETMY optical lever is not so
bad, I ran the f2pRatio script and it seems
to have worked.
  
  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.
 f2ademo.png 
  1616   Thu May 21 18:05:03 2009 peteUpdateSUSETMX coils look OK


   
        
            
 etmx_etmy_coils.pdf 
  1620   Fri May 22 01:27:14 2009 peteUpdateSUS200 days of MC3 side Looks like something went nuts in late
April.  We have yet to try a hard reboot.
 mc3_side_200days.png 
  1796   Mon Jul 27 14:12:14 2009 ranaSummarySUSTM Coil Noise SpectraRob noticed that the ITMY DAC channels were
saturating occassionally. Looking at the
spectrum we can see why.
 Coils.pdf 
  2024   Tue Sep 29 23:43:46 2009 robUpdateSUSITMY UL OSEMWe had a redo of elog entry 975
tonight.  The noisy OSEM was fixed by
jiggling the rack end of the long cable. 
 ITMYosemBAD.pdf 
  2031   Thu Oct 1 08:37:43 2009 steveUpdateSUSsuspention damping restored and MZ HV stuckEarthquake 
of magnitude 5.0  shakes ETMY loose.
MC2 lost it's damping later.
 eq5oct1.jpg 
  2034   Thu Oct 1 11:39:47 2009 JenneUpdateSUSMC2 damping restored again

    
        
  
  2036   Thu Oct 1 14:22:28 2009 robUpdateSUSall suspensions undamped

    
        
  
  2039   Thu Oct 1 19:18:24 2009 KojiUpdateSUSall suspensions undampedOps. I restored the damping of the suspensions
at around 16:30.

  
  2193   Fri Nov 6 12:56:30 2009 HaixingUpdateSUSMagnet has been levitated  

 DSC_0964.JPGblock_diagram.PNG 
  2204   Sun Nov 8 14:18:25 2009 AlbertoUpdateSUSETMY Watchdogs trippedThis afternoon I re-enabled the ETMY coils
after I found that the watchdogs for the mirror had
  
  2207   Mon Nov 9 08:43:16 2009 steveUpdateSUSMC2 damping restoredMC2 damping restored,  MZ locked and
the arms are flashing now.
  
  2246   Thu Nov 12 01:18:34 2009 haixingUpdateSUSopen-loop transfer function of mag levi system (comparison between simulink and measurement)I built a Simulink model of the magnetic
levitation system and try to explain
the dip in the open-loop transfer function
 block_diagram.pngcontribution_plot.pngmech_resp_plot.png 
  2274   Mon Nov 16 15:18:10 2009 haixingUpdateSUSStable magnetic levitation without eddy-current damping


 mag_levi_new.jpgblock_diagram_new.png 
  2280   Tue Nov 17 11:09:43 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DACI have connected ETMY sus electronics to
megatron ADC/DAC.
We continue this state until 15:00
  
  2281   Tue Nov 17 13:39:37 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DAC0) Now the connection for the ETMY suspension
was restored in a usual state. It damps
well.
  
  2282   Tue Nov 17 15:23:06 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DACOK.
Now, Timing/ADC/DAC are working. It's almost
there.
1) As a temporaly
  
  2285   Tue Nov 17 21:10:30 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DACKoji, Rana
The megatron DAC was temporaly connected
to the suspension electronics for the DAC
  
  2287   Tue Nov 17 21:21:30 2009 robUpdateSUSETMY UL OSEMHad been disconnected for about two weeks. 
I found a partially seated 4-pin LEMO cable
coming from the OSEM PD interface board. 
  
  2290   Wed Nov 18 11:27:33 2009 Koji, josephbConfigurationSUSETMY suspension conencted to megatron ADC/DAC

    
        
  
  2291   Wed Nov 18 12:33:30 2009 Koji, josephbConfigurationSUSETMY suspension conencted to megatron ADC/DACHurraaaah!
We've got the damping of the suspension.
The Oplev loops has also worked!
The
 Untitled.png 
  2293   Wed Nov 18 16:24:25 2009 peteConfigurationSUSETMY suspension conencted to megatron ADC/DAC/cvs/cds/caltech/target/fb/daqd -c daqdrc
This starts the FB.
Now the dataviewer and DTT work!
  
  2307   Fri Nov 20 11:32:48 2009 HaixingUpdateSUSMagnetic levitationI added an integrator to increase
the gain at low frequencies (below 5 Hz).
In addition, I increased
 IntDiff.PNGS8007340.jpgS8007333.jpg 
  2309   Fri Nov 20 16:18:56 2009 robConfigurationSUSwatchdog rampdownI've changed the watchdog rampdown script
so it brings the SUS watchdogs to 220, instead
of the 150 it previously targeted. 
  
  2313   Mon Nov 23 11:03:00 2009 steveUpdateSUSjackhammer special well under control


   
        
            
 dig10d.pngP1050740.JPG 
  2331   Wed Nov 25 12:28:22 2009 JenneUpdateSUSMC2 trippedJust felt a big "kerplunk" type
ground-shaking, presumably from all the antics
next door.  MC2's watchdog tripped as
  
  2363   Tue Dec 8 03:53:49 2009 kiwamuUpdateSUSFree swinging spectra of ETMX In this night, I checked the free swinging
spectra of ETMX to make sure nothing wrong
with ETMX by the wiping.
 ETMX_air.png 
  2368   Tue Dec 8 23:13:32 2009 kiwamuUpdateSUSfree swinging spectra of ETMY and ITMXThe free swinging spectra of ETMY and ITMX
were taken after today's wiping, in order
to check the test masses.
 SUS-ETMY.pngSUS-ITMX.png 
  2369   Wed Dec 9 00:23:28 2009 KojiUpdateSUSfree swinging spectra of ETMY and ITMXWhere
is the plot for the trend?
It
  
  2372   Wed Dec 9 17:51:03 2009 kiwamuUpdateSUSwatchdogsPlease do not touch
the watchdogs for all SUSs except for MCs,
  
  2374   Wed Dec 9 21:09:28 2009 kiwamuUpdateSUSRe: free swinging spectra of ETMY and ITMXOkay, now the data are attached. At that
time I just wanted to say like the follower.
- - -
 Pitch-Yaw_modes.png 
  2375   Thu Dec 10 00:46:15 2009 KojiUpdateSUSRe: free swinging spectra of ETMY and ITMXWell, I get the point now. It could
be either seismic or change in the suspension
Q.
  
  2391   Thu Dec 10 17:13:36 2009 kiwamuUpdateSUSFree swiging spectra under the atmospheric pressureThe free swinging spectra of ITMs, ETMs,
BS, PRM and SRM were measured last night
in order to make sure that nothing wrong
 summary_freeswing.pdf 
  2405   Sun Dec 13 17:43:10 2009 kiwamuUpdateSUSfree swinging spectra (vacuum)The free swinging spectra of ITMs, ETMs,
BS, PRM and SRM were measured under the vacuum-condition.
The attachment are measured spectra.
 summary_FreeSwinging_vacuum.pdf 
  2433   Sun Dec 20 14:34:24 2009 KojiUpdateSUSETMY watchdog tripped Sunday 5:00AM localIt seemed that the ETMY watchdog tripped
early Sunday morning.
The reason is not known. I just looked
 Y.png 
  2457   Mon Dec 28 12:35:57 2009 JenneUpdateSUSMC2 is having a bad dayMC2 is having a bad day, and I'm not yet
sure why.  It's to do with the damping
though.  When the damping is off, after
  
  2458   Mon Dec 28 12:45:55 2009 KojiUpdateSUSMC2 is having a bad dayThe MCL path of MC2 was in a strange state
as the filters were activated as if it is
in lock even though we had no lock. So I
  
  2494   Sun Jan 10 13:32:09 2010 HaixingUpdateSUStransfer function measurement of the quadrant maglev circuit I have assembled the circuit and the
control box for the quadrant magnetic
levitation yesterday. The final setup
 6x 
  2495   Sun Jan 10 15:47:26 2010 KojiUpdateSUStransfer function measurement of the quadrant maglev circuit 1. Why do all of the BNCs have no GND connection?
Each should have the individual cables to
the ground. Each signal line and the corresponding
  
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