 Fri Feb 24 03:58:13 2012, kiwamu, Update, LSC, Y arm + PRMI part II
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I tried the Yarm + PRMI configuration again.
The PRMI part was locked, but it didn't stay locked during the Y arm was brought to the resonance point.
I will post the time series data later. |
 Fri Feb 24 15:01:31 2012, kiwamu, Update, LSC, Y arm + PRMI part II 
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The figure below shows the time series of the Y arm + PRMI trail.
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Fri Feb 24 19:18:28 2012, kiwamu, Update, LSC, Y arm + PRMI : how they should look like
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I calculated how the DC signals should look like in the Y arm PRMI configuration.
The expected signals are overlaid in the same plot as that of shown in #6313.
You can see there are disagreements between the observed and expected signals in the plot below at around |
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Fri Feb 24 18:37:13 2012, rana, Update, LSC, Y arm + PRMI part II
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Quote:
I tried the Yarm + PRMI configuration again. |
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Fri Feb 24 19:25:43 2012, jamie, Update, LSC, ALS X-arm beatbox added, DAQ channels wiring normalized
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I have hooked the ALS beatbox into the c1ioo DAQ. In the process, I did some rewiring so that the channel mapping corresponds to what is in the
c1gcv model.
The Y-arm beat PD is going through the old proto-DFD setup. The non-existant X-arm beat PD will use the beatbox alpha. |
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Fri Feb 24 23:14:09 2012, kiwamu, Update, CDS, tdsavg went crazy
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I found that the LSCoffset script didn't work today. The script is supposed to null the electrical offsets in all the LSC channels.
I went through the sentences in the script and eventually found that the tdsavg command returns 0 every
time. |
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Sat Feb 25 00:37:42 2012, kiwamu, Update, SUS, oplev spectra during PRMI lock
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Somehow the angular stability of the central part have not been so great.
Also the angular motions look fluctuating a lot and they seem to be related with the glitches. |
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Sat Feb 25 14:27:26 2012, kiwamu, Update, LSC, glitches in the RFPD outputs
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Last night I took a closer look at the LSC analog signals to find which components are making the glitches.
I monitored the RFPD output signals and the demodulated signals at the same time with an oscilloscope when the PRMI was kept locked.
Indeed the RFPD outputs have some corresponding fast signals although I only looked at the RELL11 I and |
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Thu Feb 23 09:09:33 2012, steve, Update, SAFETY, safety checks
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Emergency exit lights were inspected: 2 out of 13 batteries have to be replaced
One of the Halon fire extinguishers needs to be recharged out of 8
Please do participate in preparation for the upcoming safety audit on Feb 28 |
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Mon Feb 27 10:21:37 2012, steve, Update, SAFETY, safety audit tomorrow morning
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Quote:
Emergency exit lights were inspected: 2 out of 13 batteries have to be replaced |
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Mon Feb 6 17:06:11 2012, steve, Update, SUS, oplev transferfunction of PIT: ETMY & ETMX
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| Kiwamu showed me how to do transferfunction of oplev pitch |
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Tue Feb 7 16:30:46 2012, steve, Update, SUS, ALL oplev PIT transfer functions 7x
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SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude:
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Thu Feb 9 16:46:02 2012, steve, Update, SUS, ALL oplev YAW transfer functions 7x
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Quote:
SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude: |
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Thu Feb 23 10:53:54 2012, steve, Update, SUS, oplev PIT transfer functions
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Oplev transfer functions PIT UGF were optimized to be at 2-3 Hz with 60 degree minimum phase margin by adjuting oplev gains.
Additional Notes by KI:
The PRM oplev has a tailored 3.3 Hz resonant gain in order to calm down a wobble during the |
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Mon Feb 27 14:35:22 2012, steve, Update, SUS, oplev YAW transfer functions
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The BS and the PRM have 3.3 Hz resonant gain filters that kill the phase margins.
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Mon Feb 27 18:33:11 2012, jamie, Update, PSL, what to do with old PSL fast channels
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It appears that the old PSL fast channels never made it into the new DAQ system. We need to figure out what to do with them.
A D990155 DAQ Interface card in far right of the 1X1
PSL EuroCard ("VME") crate is supposed output various PMC/FSS/ISS fast channels, which would then connect to the 1U |
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Mon Feb 27 14:35:37 2012, Jenne, Update, Green Locking, PSL Beat Setup
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Xarm is aligned for both IR and green.
Here is a photo of the beam paths of the PSL beat setup. I want to make sure that the X-green BBPD sees a nice beam from both the PSL and
the Xarm, without disturbing the currently working Y setup. I keep getting confused with all the beamsplitters, especially the green PBSes, which |
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Mon Feb 27 18:35:45 2012, Jenne, Update, Green Locking, X Beat Search
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Meh. I've searched in steps of 20 counts in C1:GCX-SLOW_SERVO2_OFFSET units (16 bit +\- 10V DAC, and 1GHz/V coeffecient for the Xgreen aux laser
means this is ~0.6MHz per 20 count step). I went from -400cts to +800 cts and haven't found the beatnote yet. Meh.
Both PSL green and Xgreen beams are going to the Xgreen BBPD. Both beams are easily visible, so while I didn't actually measure the power, |
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Mon Feb 27 19:04:13 2012, jamie, Update, CDS, spontaneous timing glitch in c1lsc IO chassis?
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For some reason there appears to have been a spontaneous timing glitch in the c1lsc IO chassis that caused all models running on c1lsc to loose timing
sync with the framebuilder. All the models were reporting "0x4000" ("Timing mismatch between DAQ and FE application") in the
DAQ status indicator. Looking in the front end logs and dmesg on the c1lsc front end machine I could see no obvious indication why this would have |
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Mon Feb 27 21:26:22 2012, Den, Update, PEM, seis box
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I did liso simulation of the circuit in the seis box. I think that AD620 (first amplifier in the circuit) noise might be much less with the signal from
guralps from 0.01 Hz. Here is the TF of AD620 output / circuit input.
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Tue Feb 28 16:12:59 2012, Den, Update, Adaptive Filtering, lunch talk
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Just to be clear what I said at the meeting, I write all this down here. Adaptive filtering of real signals (MC_F and GUR1_X) with all noises inside
is
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Tue Feb 28 12:00:54 2012, kiwamu, Update, LSC, installed anti-whitening filters
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I found that none of the filter banks in the LSC input signals have the precise anti-whitening filters.
I installed the precise filters on REFL11, REFL33, REFL55 and AS55 based on Jenne's measurement
(#4955) |
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Tue Feb 28 15:48:32 2012, kiwamu, Update, LSC, installed anti-whitening filters
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I installed the rest of the precise anti-whitening filters. Now all of the LSC sensors have the right filters.
Quote from #6330
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Tue Feb 28 16:39:25 2012, kiwamu, Update, LSC, MICH and PRCL signals in a simulation
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I briefly ran a Optickle code to see how the PRC macroscopic length screws up the sensing matrix in the PRMI configuration.
Especially I focused on the optimum demodulation phases for the MICH and PRCL signals to see how well they are separated in different PRC length |
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Tue Feb 28 16:44:56 2012, rana, Update, LSC, MICH and PRCL signals in a simulation
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Like I said, this is possible if you fail to set up the OSA to look at the sidebands at BOTH the AS and REFL ports
at all times. Don't waste your time - set up an OSA permanently! |
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Wed Feb 29 01:02:06 2012, Den, Update, PEM, seis box measured
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I've measured the input signal to the seismic box from seismometer Guralp 1. The spectrum of the signal in the "input +" (TP 1) is
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Thu Feb 16 21:13:07 2012, Suresh, Update, Electronics, REFL165 repair: PD replaced, DC response checked with a torch light
|
[Koji, Suresh]
Kiwamu mentioned that REFL165 is not responding and its DC out seems saturated at 9V. Koji and I checked to see if changing the power supply
to the PD changed its behaviour. It did not. |
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Tue Feb 28 16:31:08 2012, Suresh, Update, Electronics, REFL165 repair: Characterization
|
The transfer function and current noise were measured. The location of the peak shifts with the amount of incident light power (RF or DC).
The TF was measured at an incident 1064nm light power of 0.4 mW which produced a DC output voltage of 14 mV => DC photocurrent of 0.28 mA.
Many of the effects that Koji noted in the previous characterization are still present. |
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Wed Feb 29 00:22:35 2012, Suresh, Update, Electronics, REFL165 repair: Installed on the AS table
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1) The REFL165 has been replaced onto the AS table.
2) When the PD interface cable is attached the PD shows a DC out put of 6mV and does not respond to a flash light. I changed the PD interface
port in the LSC rack by swapping the other end of the cable with an unused (Unidentified PD) interface cable, The PD is working fine after that. |
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Wed Feb 29 01:14:40 2012, Suresh, Update, Electronics, REFL165 repair: Characterization
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Quote:
The transfer function and current noise were measured. The location of the peak shifts with the amount of incident light power (RF |
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Fri Feb 24 16:10:48 2012, mike, Update, Computers, PyNDS and a Plot
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Power Spectral Density plot using PyNDS, comparing 5 fast data channels for ETMX.
**EDIT** Script here:
import nds |
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Fri Feb 24 18:59:04 2012, Jenne, Update, Computers, PyNDS and a Plot
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Quote:
Power Spectral Density plot using PyNDS, comparing 5 fast data channels for ETMX. |
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Wed Feb 29 17:32:11 2012, Mike, Update, Computers, PyNDS and a Plot
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Quote:
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Wed Feb 29 20:27:00 2012, Jenne, Update, Green Locking, X green beat - found it!
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Found it!
The actual temperature of the Xend laser is 0.02 C higher than anticipated based on the formula in elog
3759. Both the PSL and the Xend laser are at their nominal diode currents (2.100 A for the PSL, 2.003 A for Xend), so the curves should be used |
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Thu Mar 1 00:05:23 2012, Den, Update, PEM, seis box noise
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I've moved GUR1 seismometer from MC2 to the working tables in order not to disturb the MC while working with the seismometer box. The new place for the
GUR1 for a few days is near the printer, cables and blue boxes. I've cleaned all mess and wires from the floor, so that seismometer now looks like that
|
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Thu Mar 1 21:48:34 2012, Den, Update, PEM, seis box noise
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Quote:
The noise increased at 0.5 Hz and is pretty big. This might explain the loose of coherence at low frequencies. |
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Fri Mar 2 11:05:28 2012, Den, Update, PEM, seis box gain
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I've replaced R2 resistor that adjusts the gain of the AD620 amplifier. Previous value 5491Ohm, new value 464Ohm, so the gain should increase up to ~200-250.
Only at the N/S 1 circuit!
LISO simulation of the circuit transfer function and noise are |
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Fri Mar 2 16:05:52 2012, Den, Update, SAFETY, laser safety
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| Today I've attended the laser safety seminar. |
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Fri Mar 2 18:11:50 2012, jamie, Summary, SUS, evaluation of eLIGO tip-tilts from LLO
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[Suresh, Jamie]
Suresh and I opened up and checked out the eLIGO tip-tilts assemblies we received from LLO. There are two, TT1 and TT2, which were used for aligning
AS beam into the OMC on HAM6. The mirror assemblies hang from steel wires suspended from little, damped, vertical blade springs. The magnets are press |
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Fri Mar 2 18:55:06 2012, Den, Update, PEM, seis box
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I've put the seismometer box back to the 1x1, Guralp is back under MC2. When the seismometer is not plugged in, the noise is
|
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Mon Mar 5 03:22:54 2012, kiwamu, Update, PSL, PMC realigned
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I realigned the steering mirrors for the PMC. The trans value went up from 0.79 to 0.83.
The misalignment was largely in the pitch direction. |
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Mon Mar 5 06:11:08 2012, kiwamu, Summary, LSC, plans
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Plans:
DRMI (PRMI) + one arm test before the LVC meeting
Study of the funny sensing matrix and the RAM offset effects before the LVC meeting
|
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Tue Feb 28 20:49:33 2012, kiwamu, Update, LSC, insalling OSA
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I am installing an OSA on the AP table and it's ongoing.
I am leaving some stuff scattered on the AP table and I will resume the work after I come back. |
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Wed Feb 29 04:23:14 2012, kiwamu, Update, LSC, REFL OSA installed
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I placed the OSA (Optical Spectrum Analyzer) on the AP table and this OSA will monitor the REFL beam.
Tomorrow I will do fine alignment of the OSA.
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Mon Mar 5 05:39:36 2012, kiwamu, Update, LSC, REFL OSA installed
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The OSA for the REFL beam is now fully functional.
The only thing we need is a long BNC cable going from the AP table to the control room so that we can
monitor the OSA signal with an oscilloscope. |
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Mon Mar 5 13:11:06 2012, kiwamu, Update, LSC, installed a long BNC cable for REFL OSA
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A long BNC cable was installed and now the REFL OSA signal is happily shown on an oscilloscope in the control
room.
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Mon Mar 5 14:10:35 2012, kiwamu, Update, LSC, power budget on the AP table
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I checked the laser powers on the AP table and confirmed that their powers are low enough at all the REFL photo
diodes.
When the HWP( which is for attenuating the laser power with a PBS) is at 282.9 deg all of the REFL diodes |
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Mon Mar 5 15:15:15 2012, Den, Update, PEM, RCG
|
[Alex / Den]
I've encountered a problem that C1:PEM-SEIS_GUR1_X_IN1 is saved in the int format. It turned out that inside
the code the signal is also in the int format. It is not just a saving error. It should not be so as ADC works at 64k and the model |
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Tue Mar 6 00:13:20 2012, keiko, Update, LSC, ASI signal offset
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AS55Q and AS55I signals. AS55Q is around zero while AS55I has a large offset which is about the signal amplitude. It is likely because of the RAM? |
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Mon Mar 5 18:12:00 2012, Keiko, Update, LSC, RAM simulation update
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I wrote an RAM simulation script ... it calculates the LSC signal offset and the operation point offset depending on the RAM modulation index.
Configuration : RAM is added on optC1, by the additional Mach-Zehnder ifo before the PRM.
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Tue Mar 6 15:22:02 2012, Keiko, Update, LSC, RAM simulation update
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Quote:
I wrote an RAM simulation script ... it calculates the LSC signal offset and the operation point offset depending on the RAM modulation |
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Mon Mar 5 23:47:15 2012, keiko, Configuration, LSC, ND2 at REFL OSA
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ND filter ND3 (which is at the REFL port to
the REFL OSA) is removed. Don't forget to put it back when you restore PRM!!! |
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Tue Mar 6 16:06:15 2012, Jenne, Configuration, SUS, PRM watchdog tripped
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Quote:
ND filter |
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Tue Mar 6 16:17:36 2012, Jenne, Update, SUS, SUS matrix diagonalization status
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Has default inmat:
PRM, ITMX
Has fancy inmat: |
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Tue Mar 6 01:35:03 2012, kiwamu, Update, LSC, MICH characterization
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[Keiko / Kiwamu]
Update on the MICH characterization:
The OSAs weren't so great because the 11 MHz sidebands were covered by the carrier's tail
It seemed that the |
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Tue Mar 6 23:14:38 2012, rana, Update, SUS, Optical Lever had bad filters
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We found that that bounce (16.1 Hz) and roll (23.5 Hz) modes on the ITMX were much higher than on the ITMY. After some checking, it seems that
the bandstop filters for the
SUSPOS, SUSPIT, SUSYAW, and SUSSIDE loops are set to the correct frequencies. However, the OLPIT and OLYAW had not been set correctly. I have copied |
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Tue Mar 6 23:37:31 2012, keiko, Update, SUS, MICH noise budget - SUS check 6x
|
Here are the OSEM spectrum of MICH suspensions (BS, IX, IY). Bounce and Roll modes are shown on 16 and 23 Hz. The filters for them has been checked.
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Wed Mar 7 11:20:23 2012, steve, Update, SUS, oplev qpd offsets zeroed
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| All oplev qpd quadrons were zeroed by offset in blocked dark condition. |
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Wed Mar 7 11:44:29 2012, Jenne, Update, Green Locking, Xgreen beatnote cable made, laid
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The Xgreen PD now has a cable going over to the beatbox. Once beatbox characterization is done I can re-find the beat, and we can do some stuff with
the beatbox. |
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Wed Mar 7 13:30:17 2012, Jim, Update, PEM, added TPs and JIMS channels to PEM front-end model
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[Jim Ryan]
The PEM model has been modified now to include a block called 'JIMS' for the JIMS(Joint Information Management System) channel processing. Additionally
I added test points inside the BLRMS blocks that are there. These test points are connected to the output of the sqrt function for each band. I needed |
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Wed Feb 22 16:55:16 2012, Jamie, Update, SUS, wacky state of SUS input matrices
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While Kiwamu and I were trying to investigate the the vertex glitches we were noticing excess
noise in ITMX, which Kiwamu blamed on some sort of bad diagonalization. Sure enough, the ITMX input matrix is in the default state [0], not
a properly diagonalized state. Looking through the rest of the suspensions, I found PRM also in the default state, not diagonalized. |
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Thu Feb 23 02:20:07 2012, Zach, Update, SUS, wacky state of SUS input matrices
|
This reminds me that the whole Dr. SUS situation never got taken care of. Where I left off, I was having issues
pulling 40m data with NDS2 (which is what all the diagonalization scripts use).
What is the deal with 40m+NDS2? If it is till no-go, can we have a consensus on whether |
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Wed Mar 7 21:13:30 2012, rana, Update, DAQ, NDS2
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I noticed that NDS2 was not running on mafalda as it should be. Instead, there were a couple of zombie MEDMs using up 99% of the CPU. I killed
the zombies and have run the 'build channel list' script. When it finished, I tried to restart the nds server, but got the following error in the log file.
Email has been dispatched to JZ. |
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Fri Feb 24 04:12:44 2012, kiwamu, Update, SUS, freeswing test
|
The following optics were kicked:
MC1 MC2 MC3 ETMX ETMY ITMX ITMY PRM SRM BS
Fri Feb 24 04:11:15 PST 2012
1014120690
Steve (or anyone), can you restore the watchdogs when you come to the lab in the morning ?
|
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Fri Feb 24 08:06:52 2012, steve, Update, SUS, sus restored
|
Quote:
The following optics were kicked:
MC1 MC2 MC3 ETMX ETMY ITMX ITMY PRM SRM BS
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Wed Mar 7 16:32:09 2012, keiko, Update, LSC, OSA
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I swap an OSA at PSL and OSA at REFL. It was because the PSL-OSA had a better resolution, so we place this better one at REFL. The ND filter (ND3)
which was on the way to REFL OSA was replaced by two BSs, because it was producing dirty multiple spots after transmitting. |
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Wed Mar 7 19:10:06 2012, kiwamu, Update, LSC, REFL OSA : how the signal look like
|
Just a quick report on the REFL OSA.
The attached plot below shows the raw signal from the REFL OSA which Keiko installed in this afternoon.
When the data was taken the beam on the REFL OSA was a direct reflection from PRM with the rest of the suspended mirrors misaligned. |
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Wed Mar 7 20:06:23 2012, Koji, Update, LSC, REFL OSA : how the signal look like
|
| I'm puzzled why the 11MHz peak can be such high considering 1.7~2 times smaller the modulation depth. |
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Wed Mar 7 22:04:05 2012, kiwamu, Update, LSC, REFL OSA : how the signal look like
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I was also wondering about the same thing, comparing with what Mirko obtained before with the same OSA (
#5519).
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Wed Mar 7 23:28:41 2012, Lab Cleanup Crew, HowTo, Environment, True Beauty....
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Or, how a lab should look at the end of every day.
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Wed Mar 7 23:29:28 2012, keiko, Update, LSC, REFL OSA observation
|
kiwamu, keiko
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Wed Mar 7 17:39:40 2012, keiko, Update, LSC, MICH noise budget on 5 Mar
|
This is the calibrated MICH noise budget on Mar 5. There was a sharp peak at 1Hz and a blob on 3 Hz. The demod phase was adjusted for AS55Q.
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Wed Mar 7 20:53:13 2012, keiko, Update, LSC, MICH noise budget on 5 Mar
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Thu Mar 8 00:57:48 2012, keiko, Update, LSC, MICH noise budget on Mar 5, Mar 6, and old
|
Here is the recent two noise budgets of MICH, with the old measurement by Jenne. The most latest Mar 6 data is quite close to the old data, even better
around 20-30 Hz. Probably some scattering source was improved?
|
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Fri Mar 9 10:17:06 2012, steve, HowTo, PEM, do not leave tables open
|
Type: How not to
Please do not leave optical tables open! You will be held responsible for creating dirty optics. |
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Fri Mar 9 10:44:57 2012, steve, Update, RF System, OSA
|
Optical spectrum analyzers like the Attachment made by Coherent , Meles Griot- CVI and Spectral Product are all discontinued.
The 40m have Coherent models C240 analyzer with controller C251 Their Finesse measured in 2004: sn205408 F302, sn205409 F396,
Jenne borrowed Jan's Meles Griot model 13SAE006, Peter King has the same model. FSR 300 MHZ, finnees 200 minimum |
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Fri Mar 9 11:59:38 2012, Zweizig the ELOG Maven, Summary, CDS, NDS2 restart
|
Hi Rana,
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Fri Mar 9 16:00:46 2012, steve, Update, Green Locking, laser emergency shut down switch replaced at the south end
|
Over-sized local laser emergency switch was held by large C clamp at the south end. This was replaced by a smaller one and it is mounted with magnets.
The Innolight laser was turned off, while the interlock was wired. |
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Thu Mar 8 04:13:12 2012, kiwamu, Update, LSC, update on the locking activity
|
[Keiko / Kiwamu]
Some updates on the locking activity:
Started summarizing the data of the Michelson lock in a wiki page:
https://wiki-40m.ligo.caltech.edu/Interferometer_Characterization/Michelson_Noise_Budget
|
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Fri Mar 9 13:34:13 2012, keiko, Update, LSC, update on the locking activity
|
We tried to measure the sensing matrix for MICH and PRCL last night. They look too much mixed as we expect... the matrix may be posted later. We suspect
the IX and IY of the MICH excitation is not balanced very well, although Kiwamu adjusted that about two weeks ago, and it is mixing the dof. We'll try
to balance it again, ans see the matrix. |
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Sat Mar 10 02:00:03 2012, keiko, Update, LSC, update on the locking activity
|
ITMX and ITMY balance for the MICH excitation (lockin) is adjusted again. Now it's ITMx = -0.992, ITMy = 1 for MICH (lockin output matrix values).
RA: what were the old values? Does this change make any difference for the signal mixing noticed before? |
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Mon Mar 12 22:14:56 2012, Suresh, Update, RF System, Calibration of Demod Board Efficiency.
|
I have completed the calibration of the demod board efficiencies. Here is the schematic of the set-up.
|
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Fri Mar 9 20:44:24 2012, Jim Lough, Update, CDS, DAQ restart with new ini file
|
DAQ reload/restart was performed at about 1315 PST today. The previous ini file was backed up as c1pem20120309.ini
in the /chans/daq/working_backups/ directory.
I set the following to record: |
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Tue Mar 13 13:28:31 2012, Ryan Fisher, Update, CDS, DAQ restart with new ini file
|
Extra note: This was the ini file that was edited:
/cvs/cds/rtcds/caltech/c1/chans/daq/C1PEM.ini |
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Wed Mar 7 04:08:48 2012, kiwamu, Update, SUS, BS SIDE gain was too low
|
The BS SIDE damping gain seemed too low. The gain had been 5 while the rest of the suspensions had gains of 90-500.
I increased the gain and set it to be 80.
|
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Wed Mar 14 03:34:44 2012, kiwamu, Update, SUS, Adjustment of BS suspension output matrix : coupling from SIDE to POS
|
[Rana / Kiwamu]
We put some elements in the BS output matrix to mitigate the actuator coupling from SIDE to POS.
As a result the degree of the coupling reduced by a factor of 2 or so. |
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Tue Feb 21 16:10:29 2012, kiwamu, Update, IOO, degradation in input PZT1
|
PZT1, the one with Koji's custom mid-HV driver (#5447), is getting degraded.
The movable range in the pitch direction became narrower than what it used to be (maybe a factor of 3 estimated |
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Mon Mar 5 03:50:49 2012, kiwamu, Update, IOO, PZT1 PITCH railing
|
PZT1 started railing in the pitch direction and because of this TRY doesn't go more than 0.7. I will
leave it as it is for tonight.
Tomorrow I will shift the alignment of the MC to make the PZT1 happier. |
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Mon Mar 5 17:07:58 2012, kiwamu, Update, IOO, realigned MC
|
I have slightly shifted the MC beam pointing to relax the PZT1 PITCH. As a result the TRY value went to 0.97
in a first lock trial.
However another issue arose: |
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Thu Mar 8 23:37:03 2012, kiwamu, Update, IOO, dither Y arm dither script
|
I disabled the feedback to the PZT1 PITCH in the Y arm dithering scripts so that it won't push the beam away
from the good point.
Currently one has to do a manual alignment only for the PZT PITCH but the rest of DOFs are still able to be automatically aligned with the script. |
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Wed Mar 14 04:03:37 2012, kiwamu, Update, IOO, PZT1 and associate extra works
|
As the PZT1 has not been functional, I have been aligning the Y arm to the input beam instead of aligning the beam to the Y arm.
It turned out that this procedure leads to two extra works everytime after alignments of the Y arm:
The Y green beam must be always aligned to the Y arm
The |