| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15651
|
Thu Oct 29 12:43:35 2020 |
gautam | Update | General | Vent Prep |
Oplev HeNe at ETMY was replaced,
see here
for my earlier discussion on this.
I |
|
|
15650
|
Thu Oct 29 09:50:12 2020 |
anchal | Summary | Calibration | Preliminary calibration measurement taken | I went to 40m yesterday at around 2:30
pm and Koji showed me how to acquire lock
in different arms and for different lasers. |
|
|
15649
|
Wed Oct 28 20:42:53 2020 |
Koji | Update | General | Vent Prep |
Two arms / BS / PRM / SRM were
aligned. (Attachment 1)
IMC
was aligned by WFS and the WFS offsets were |
10x |
|
15648
|
Wed Oct 28 14:07:47 2020 |
gautam | Update | General | ISS checkout | Ok I was using the PD in the black mount
because Rana recommended it a few weeks ago.
Regarding the M2ISS, I acquired |
|
|
15647
|
Wed Oct 28 14:01:03 2020 |
not gautam | Update | General | ISS checkout | that little PD in the black mount was never
very good. The AD829 is not a good opamp
for transimpedance and especially not good |
|
|
15646
|
Wed Oct 28 09:35:00 2020 |
Koji | Update | CDS | RFM errors | I'm starting the model restarts from
remote. Then later I'll show up in the
lab to do more hard resets. |
|
|
15645
|
Tue Oct 27 23:47:53 2020 |
gautam | Update | General | ISS checkout | I wanted to look into the ISS situation.
Some weeks ago, I found the PD
that was previously used as the in-loop photodiode. |
|
|
15644
|
Mon Oct 26 17:26:26 2020 |
gautam | Update | IOO | Excess laser freq noise investigation | Apart from the questionable wiring on the Acromags,
one other important difference is in the
way the connections were made between the |
|
|
15643
|
Mon Oct 26 13:35:58 2020 |
Koji | Update | IOO | Excess laser freq noise investigation | In fact, the problem was the grounding
issue (presumably on the IOO racks).
A temporary differential receiver |
6x |
|
15642
|
Fri Oct 23 19:01:57 2020 |
Koji | Summary | PEM | PSL Particle Counter kit removed from the table | The particle counter on the 40m PSL was
removed. The package was made together with
the OMC lab particle counter (see the packing |
|
|
15641
|
Fri Oct 23 16:41:06 2020 |
Koji | Update | IOO | Excess laser freq noise investigation | [Koji, Rana]
We wanted to track down the excess
noise seen in MC_F and other places (see |
|
|
15640
|
Fri Oct 23 09:03:43 2020 |
anchal | Update | Electronics | HV coil driver packaged into 2U chassis | Andrew made a battery-powered 0.7 nVrtHz
input-referred noise pre-amplifier for gain
of 200. That might help you. |
|
|
15639
|
Thu Oct 22 22:01:53 2020 |
gautam | Update | Electronics | HV coil driver packaged into 2U chassis | It's not so easy to directly measure
this I think, because the filtering is rather
aggressive. |
|
|
15638
|
Thu Oct 22 13:04:42 2020 |
rana | Update | Electronics | HV coil driver packaged into 2U chassis | what is the noise level before the HV stage?
i.e. how well is the acromag noise being
filtered? |
|
|
15637
|
Thu Oct 22 11:48:08 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I found this H1 alog entry
by Izumi confirming that the calibrated channels
CAL-CS_* need the same dewhitening filter. |
8x |
|
15636
|
Thu Oct 22 11:14:47 2020 |
gautam | Update | Electronics | HV coil driver packaged into 2U chassis | I packaged the HV coil driver into a 2U
chassis, hoping for better shielding from
pickup. There |
|
|
15635
|
Tue Oct 20 20:12:18 2020 |
Koji | Summary | General | DJI OSMO Pocket Camera Kit | I set up an action cam (DJI OSMO Pocket)
and brought it back to the 40m. The kit is
now placed in the control room cabinet together |
|
|
15634
|
Mon Oct 19 15:40:02 2020 |
Koji | Update | PEM | Alaska EQ M7.5 | Alaska M7.5 20:54UTC https://earthquake.usgs.gov/earthquakes/eventpage/us6000c9hg/executive
I looked at the suspensions. The |
|
|
15633
|
Mon Oct 19 15:38:42 2020 |
Koji | Update | Electronics | Loan: A file binder "40m wiring diagram" | I'll bring a file binder "40m
wiring diagram" to home at the next
chance. |
|
|
15632
|
Fri Oct 16 19:44:41 2020 |
anchal | Summary | General | Lab Entry Notification | I entered 40m today at around 1:10 pm and
left by 1:50 pm. I entered 104 through the
machine shop entry. I took top view single |
|
|
15631
|
Fri Oct 16 09:16:37 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | Pushed another update to MCMC simulation.
This includes:
Added new imbalances: ITM |
8x |
|
15630
|
Thu Oct 15 20:00:23 2020 |
Koji | Summary | General | HEPA AC cord replacement | The AC cord from the PSL HEPA variac
to the junction box was replaced.
Now the HEPA is running at 70% |
|
|
15629
|
Thu Oct 15 13:48:58 2020 |
anchal | Summary | General | Lab Entry Notification | I entered 40m today at around 1:20 pm and
left by 1:45 pm. I entered 104 through the
machine shop entry. I did the following: |
|
|
15628
|
Thu Oct 15 10:42:39 2020 |
gautam | Update | BHD | More investigation into RF44 sensing | Summary of discussion between
Koji and gautam on 14 Oct:
Koji questioned the accuracy |
|
|
15627
|
Wed Oct 14 18:16:27 2020 |
gautam | Update | General | PSL HEPA-->50% | Per Koji's suggestion, I turned the
PSL HEPA Variac to 50% just now, so that
the power load through the burnt electrical |
|
|
15626
|
Wed Oct 14 17:03:55 2020 |
anchal | Summary | ALS | ALS noise budget update - Added whitening filter for ADC | Koji recommended that I can add whitening
filters to suppress ADC noise easily. I added
a filter before ADC in ALS loop with 4 zeros |
|
|
15625
|
Wed Oct 14 13:28:04 2020 |
Koji | Update | COC | ITM/ETM spares in Downs | The two ITM spares and two ETM spares are
together stored in the optic storage (B110)
at Downs. c/o Liyuan and GariLynn |
|
|
15624
|
Tue Oct 13 21:22:29 2020 |
gautam | Update | General | Space cleared in 1Y1 for new FEs | [JV, GV]
We cleared up some space in the |
|
|
15623
|
Tue Oct 13 11:13:54 2020 |
gautam | Update | BHD | Investigation into RF44 sensing | Attachment
#1: spectra of the |
|
|
15622
|
Fri Oct 9 18:32:14 2020 |
anchal | Summary | ALS | ALS noise budget update - Updated AUX PDH Loop values | The only two PZT Phase modulation transfer
function measurements I could find are 40m/15206 |
|
|
15621
|
Thu Oct 8 18:40:42 2020 |
Koji | Update | Computer Scripts / Programs | Finesse GUI | Is it better than Luxor? https://labcit.ligo.caltech.edu/~jharms/luxor.html |
|
|
15620
|
Thu Oct 8 15:08:25 2020 |
gautam | Update | General | Some boxes moved from 40m entry hallway |
UPS batteries
2x HEPA
filters
VWR chemicals (methanol)
These
boxes were moved from the 40m hallway to |
|
|
15619
|
Thu Oct 8 11:59:52 2020 |
rana | Summary | ALS | ALS noise budget update - Updated AUX PDH Loop values | For all the loops where we drive the NPRO
PZT, there is some notch/resonance feature
due to the PZT mechanical resonance. In the |
|
|
15618
|
Thu Oct 8 08:37:15 2020 |
gautam | Update | Computer Scripts / Programs | Finesse GUI | This
looks cool, we should have something similar,
can be really useful. |
|
|
15617
|
Wed Oct 7 16:56:23 2020 |
anchal | Summary | ALS | ALS noise budget update - Updated AUX PDH Loop values | AUX PDH Loop update
I
used D1400293
to get the latest logged details about the |
|
|
15616
|
Wed Oct 7 13:06:27 2020 |
Koji | Update | General | Presence in the lab | Tue evening from 4pm~6pm, Koji made a social
distant tour for Anchal. We were present
around the PSL/AS/ETMX tables. |
|
|
15615
|
Tue Oct 6 14:35:16 2020 |
Jordan | Update | VAC | Spare forepumps | I have placed 3 new in box, IDP 7 forepumps
along the x arm of the interferometer. These
are to be used as spares for both the 40m |
|
|
15614
|
Tue Oct 6 07:37:20 2020 |
yehonathan | Update | Wiki | New TIS measurements of 40m Optics | LiYuan has kindly done some Total Integrating
Sphere (TIS) measurements on ITMU01 and ITMU02.
A summary of the measurement is attached. |
|
|
15613
|
Mon Oct 5 14:01:41 2020 |
gautam | Update | Electronics | aLIGO demod boards stuffed and delivered | We received 20pcs of stuffed
demodulator
boards from Screaming Circuits today. |
|
|
15612
|
Mon Oct 5 00:53:16 2020 |
Koji | Update | BHD | Single bounce interferometer locked | 🤘🤘🤘
|
|
|
15611
|
Mon Oct 5 00:37:19 2020 |
gautam | Update | BHD | Single bounce interferometer locked | Summary:
The simple interferometer, composed
of a single bounce reflection from ITMY and |
|
|
15610
|
Sun Oct 4 15:32:21 2020 |
gautam | Update | SUS | Suspension health check | Summary:
After the earthquake on September
19 2020, it looks to me like the only |
|
|
15609
|
Sat Oct 3 16:51:27 2020 |
gautam | Update | CDS | RFM errors | Attachment
#1 shows that the |
|
|
15608
|
Fri Oct 2 12:52:22 2020 |
gautam | Update | General | Spectroscopic grade Isopropanol delivered | 2x500 ml bottles of spectroscopic grade
isopropanol were delivered. I marked them
with today's date and placed them in |
|
|
15607
|
Fri Oct 2 10:29:49 2020 |
gautam | Update | Optical Levers | ETMY, BS and ITMX HeNes degrading | Attachment
#1 shows that the |
|
|
15606
|
Thu Oct 1 17:44:48 2020 |
gautam | Update | General | Some inventory notes | The optomechanics stock in the lab was
in a sad state. We have obtained the following
from Thorlabs in the last two months: |
|
|
15605
|
Wed Sep 30 19:45:56 2020 |
rana | Update | General | HEPA blower startup capacitor replacement | it would be a good idea for us to have
an auto-reminder to have us check the flow
of all the HEPAs in the lab and elog it once |
|
|
15604
|
Wed Sep 30 17:12:24 2020 |
gautam | Update | General | HEPA blower startup capacitor replacement | [JV, GV]
The HEPAs work again. After running |
|
|
15603
|
Tue Sep 29 17:07:25 2020 |
gautam | Update | General | Lab visit for inventory location | I was in the lab from 1630-1830. I have located
and visually inspected all the parts required
for the magnet regluing / optic cleaning |
|
|
15602
|
Wed Sep 23 15:06:54 2020 |
Jordan | Update | VAC | TP2 Forepump Re-install | I removed the forepump to TP2 this morning
after the vacuum failure, and tested in the
C&B lab. I pumped down on a small volume |
|