ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
13737
|
Fri Apr 6 21:39:09 2018 |
gautam | Update | IOO | MC2 suspension health checkup | While Kevin is working on the MC2 electronics
chain - we disconnected the output to the
optic (DB15 connector on coil driver board). |
|
|
13736
|
Fri Apr 6 18:28:57 2018 |
rana | Update | PEM | PID tuning | Made some changes:
Set P and D gains to zero.
We only need slow drift control.
Changed |
|
|
13735
|
Fri Apr 6 16:17:20 2018 |
Kira | Update | PEM | PID tuning | I have been trying to tune the PID and
have managed to descrease the oscillations
without saturating the actuator. I'm |
|
|
13734
|
Fri Apr 6 16:07:18 2018 |
gautam | Update | CDS | Frequent EPICS dropouts | Kira informed me that she was having trouble
accessing past data for her PID tuning tests.
Looking at the last day of data, |
|
|
13733
|
Fri Apr 6 10:00:29 2018 |
gautam | Update | CDS | CDS puzzle |
Quote:
|
|
|
13732
|
Thu Apr 5 19:31:17 2018 |
gautam | Update | CDS | EPICS processes for c1ioo dead | I found all the EPICS channels for the
model c1ioo |
|
|
13731
|
Thu Apr 5 13:46:42 2018 |
gautam | Update | SUS | big earthquake | Seems like there was a 5.3 magnitude EQ
~10km from us (though I didn't feel it).
All watchdogs were tripped so our mirrors |
|
|
13730
|
Thu Apr 5 12:13:18 2018 |
Koji | Update | IOO | Coil driver noise | Why is MC2 LR so different from the others??? |
|
|
13729
|
Thu Apr 5 10:38:38 2018 |
gautam | Update | CDS | CDS puzzle | I'm probably doing something stupid
- but I've not been able to figure this
out. In the MC1 and MC3 coil driver filter |
|
|
13728
|
Thu Apr 5 04:36:56 2018 |
Kevin | Update | IOO | Coil driver noise | [Gautam, Kevin]
We measured the MC coil driver
noise at the output monitors of the coil |
|
|
13727
|
Wed Apr 4 16:23:39 2018 |
gautam | Update | CDS | slow machine bootfest | [johannes, gautam]
It's been a while - but today,
all slow machines (with the exception of |
|
|
13726
|
Wed Apr 4 16:23:10 2018 |
Kira | Update | PEM | PID test | I did a step response for the loop from
35 degrees to 40 degrees. The PID is not
properly tuned, so the signal oscillates. |
|
|
13725
|
Mon Apr 2 15:14:21 2018 |
Koji | Update | General | Modulation depth measurement for an aLIGO EOM | The new matching circuit was tested.
Results: |
|
|
13724
|
Fri Mar 30 22:37:36 2018 |
Kevin | Update | IOO | MCREFL_PD Optical response measurement | [Gautam, Kevin]
We redid the measurement measuring
the voltage noise from the REFL PD demod |
|
|
13723
|
Fri Mar 30 16:10:46 2018 |
Kira | Update | PEM | PID test | I created two new channels today, C1:PEM-SEIS_EX_TEMP_MON_CELCIUS,
which turns the output voltage signal into
degrees C, and C1:PEM-SEIS_EX_TEMP_CTRL_WATTS, |
|
|
13722
|
Fri Mar 30 06:16:45 2018 |
rana | Update | PEM | PID test | Can't really figure out what this plot
means. We need to see the sensor (in units
of deg C) and the control signal (in heating |
|
|
13721
|
Fri Mar 30 06:14:31 2018 |
rana | Update | IOO | MCREFL_PD Optical response measurement | the noise eater on/off measurements should
be done for 0-100 kHz and from the demod
board output monitor |
|
|
13720
|
Fri Mar 30 03:23:50 2018 |
Koji | Update | General | aLIGO EOM work | I have been working on the aux beat setup
on the PSL table between 9PM-3AM.
This work involved: |
|
|
13719
|
Thu Mar 29 17:57:36 2018 |
arijit | Update | IOO | MCREFL_PD Optical response measurement | Kevin, Gautam and Arijit
Today we performed the in-loop
noise measurements of the MCREFL-PD using |
|
|
13718
|
Thu Mar 29 17:14:42 2018 |
Kira | Update | PEM | PID test | [Kira, Gautam]
We closed the loop today and implemented
the PID script. I have attached the StripTool |
|
|
13717
|
Thu Mar 29 12:03:37 2018 |
Jon Richardson | Summary | General | Proof-of-Concept SRC Gouy Phase Measurement | I've been developing an idea for making
a direct measurement of the SRC Gouy phase at
RF. It's a very different approach from |
|
|
13716
|
Wed Mar 28 21:47:37 2018 |
arijit | Update | IOO | MCREFL_PD Optical response measurement | Kevin, Gautam and Arijit
We did a optical measurement of
the MCREFL_PD transimpedance using the Jenny |
|
|
13715
|
Wed Mar 28 21:31:39 2018 |
gautam | Update | IOO | MC REFL PD removed | I re-installed the MC REFL photodiode.
Centered beam on the PD by adjusting steering
mirror to maximize the DC signal level (on |
|
|
13714
|
Wed Mar 28 17:28:58 2018 |
Steve | Update | PSL | noise eater on or off | Till RIN measurement noise eater is off
on 2W laser. The inno 1W has no noise
eater. |
|
|
13713
|
Wed Mar 28 16:44:27 2018 |
Steve | Update | General | AP table today | MCRefl is absent, it is under investigation.
I removed a bunch of hardware and note all
spare optics along the edges. |
|
|
13712
|
Tue Mar 27 23:37:35 2018 |
gautam | Update | IOO | MC REFL PD removed | I've
removed the MC REFL PD unit from the AS table |
|
|
13711
|
Tue Mar 27 19:32:03 2018 |
arijit | Update | IOO | PSL noise eater was off | Kevin, Gautam and Arijit
We made a measurement of the MC_REFL
photodiode transfer function using the network |
|
|
13710
|
Tue Mar 27 11:11:16 2018 |
Kira | Update | PEM | Channel setup | [Kira, Gautam]
We setup the channels for PID control
of the seismometer can. First, we ssh into |
|
|
13709
|
Tue Mar 27 08:58:21 2018 |
Steve | Update | VAC | VM1 opened.......scan fine |
|
|
|
13708
|
Tue Mar 27 01:39:44 2018 |
gautam | Update | IOO | PSL noise eater was off | While Kevin and Arijit were doing their
MC_REFL PD noise measurements (which they
will elog about separately shortly), I noticed |
|
|
13707
|
Mon Mar 26 23:49:27 2018 |
gautam | Update | General | New ADC Adaptor Board installed in C1LSC expansion chassis | Todd informed me that the ADC Timing adaptor
boards we had ordered arrived today. I had
to solder on the components and connectors |
|
|
13706
|
Mon Mar 26 21:40:26 2018 |
gautam | Summary | IOO | MC2 classical radiation pressure noise | [rana, gautam]
we measured the RIN of the MC2
transmission using the PDA255 I had put on |
|
|
13705
|
Mon Mar 26 21:25:55 2018 |
rana | Summary | IOO | MC2 Trans table has issues | Gautam, Rana
While at the MC2 table, we noticed
that it has some optical problems: |
|
|
13704
|
Mon Mar 26 16:10:33 2018 |
Kira | Update | PEM | final setup sketch | I made sketches of the final setup. There
will be a box in the rack that contains both
the heater circuit and the temperature sensor |
|
|
13703
|
Mon Mar 26 10:15:20 2018 |
Arijit | Update | IOO | PMC and IMC re-locked | [Gautam, Arijit]
PMC and IMC re-aligned and re-locked.
Both cavities are staying locked. Arm cavities |
|
|
13702
|
Mon Mar 26 09:25:18 2018 |
Steve | Update | VAC | VM1 opened | CC1 old MKS cold cathode gauge randomly
turns on- off. This makes software interlock
close VM1 to protect RGA So the closed |
|
|
13701
|
Fri Mar 23 12:45:08 2018 |
Kira | Update | PEM | test setup | I fit the data that we got from the test.
The time constant for the cooling came out
to be about 4.5 hours. The error is quite |
|
|
13700
|
Fri Mar 23 12:00:20 2018 |
rana | Update | PEM | test setup | we don't ever want to use our 16 kHz
real time system for such low frequency action;
its main purpose is for real-time controls, |
|
|
13699
|
Thu Mar 22 17:47:16 2018 |
Angelina Pan | Summary | | Proposed QPD Optical Arrangement | |
|
|
13698
|
Wed Mar 21 21:13:44 2018 |
gautam | Update | IOO | IMC noise budget | I've added two curves to the NB. Both
are measured (with FET preamp) at the output
of the demod board, with the LO driven at |
|
|
13697
|
Wed Mar 21 17:31:21 2018 |
gautam | Update | IOO | MC error point calibration | I did a preliminary noise budget of the
transmitted frequency noise of the IMC. Attachment
#1 shows the NB. I'm going to use this |
|
|
13696
|
Wed Mar 21 15:52:45 2018 |
gautam | Update | IOO | MC error point calibration | As discussed at the meeting, I decided
to calibrate the MC error point into physical
units of Hz/rtHz (a.k.a. the |
|
|
13695
|
Wed Mar 21 10:00:35 2018 |
steve | Update | General | projector light bulb replaced | Light bulb replaced.
|
|
|
13694
|
Tue Mar 20 22:44:45 2018 |
gautam | Update | IOO | IMC loop checkup | After some persistence, I managed to get
the mixers off.
Having gotten the mxiers |
|
|
13693
|
Tue Mar 20 21:08:03 2018 |
gautam | Update | IOO | IMC loop checkup | This elog
by koji inspired me to consider power supply
as a possible issue. |
|
|
13692
|
Tue Mar 20 19:48:10 2018 |
gautam | Update | PEM | test setup | according to the temp sensor readout, which
was ~-3.35V which corresponds to ~335K, the
temperature of the can is now 60 |
|
|
13691
|
Tue Mar 20 16:56:01 2018 |
Kira | Update | PEM | test setup | The MOSFET was getting pretty hot, so I
switched it out to a larger heat sink and
it's fine now. I then used a function |
|
|
13690
|
Tue Mar 20 16:53:03 2018 |
gautam | Update | IOO | IMC loop checkup | Re-measured the demod board noises after
replacing the suspect ERA-5SMs, with LO driven
by a marconi at the "nominal" level |
|
|
13689
|
Mon Mar 19 23:44:00 2018 |
gautam | Update | IOO | IMC loop checkup | [koji,
gautam]
I began my investigations |
|
|
13688
|
Mon Mar 19 15:02:29 2018 |
gautam | Update | ALS | Noisy MC sensing | The working hypothesis, since the excess
noise in single arm locks is coherent between
both arms, the excess sensing noise is frequency |
|