| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16748
|
Tue Mar 29 17:35:54 2022 |
Paco | Update | SUS | Damping fix on BS, AS4, PR2, and PR3 | [Ian, Paco]
We removed the "cheby"
filters from AS4, PR2 and PR3 which had been |
|
|
16749
|
Thu Mar 31 18:58:16 2022 |
Ian MacMillan | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Xarm | [Ian, Paco]
We continued to try and lock the
IR laser to the x-arm. Last time we adjusted |
|
|
16750
|
Fri Apr 1 14:26:19 2022 |
Ian MacMillan | Summary | PEM | Particle counter setup near BS Chamber | I mounted the particle counter over the
BS chamber attached to the cable tray as
seen in Attachment 1. The signal cable runs |
|
|
16751
|
Fri Apr 1 14:26:50 2022 |
Tega | Update | Optical Levers | Simplified sketch on MC table | Here is an early sketch
of the MC table.
|
|
|
16752
|
Fri Apr 1 17:02:02 2022 |
Koji | Update | Optical Levers | Simplified sketch on MC table | We are supposed to have BS Oplev Beams.
We don't like the shallow angle reflections
(i.e. AOI>45deg). |
|
|
16753
|
Fri Apr 1 22:22:29 2022 |
Koji | Update | Optical Levers | Simplified sketch on MC table | Possibility to swap BS and ITMX
tables:
BS table, which Tega said MC table, |
|
|
16754
|
Sat Apr 2 15:46:13 2022 |
rana | Summary | PEM | Particle counter setup near BS Chamber | nice - please update the particle counter
page in the 40m wiki. Its probably years
out of date. |
|
|
16755
|
Mon Apr 4 15:49:06 2022 |
Tega | Update | Optical Levers | Simplified sketch on BS table | I have updated the BS table using feedback
from Koji and Paco and the attached
pdf document is the latest iteration. |
|
|
16756
|
Mon Apr 4 17:03:47 2022 |
Anchal | Summary | CDS | c1susaux2 slow controls acromag chassis fixed and installed | [Anchal, JC, Ian, Paco]
We have now fixed all issues with
the PD mons of c1susaux2 chassis. The slow |
|
|
16757
|
Tue Apr 5 18:15:06 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Xarm | [Paco, Anchal, Ian, JC]
We attempted the alignment of IR
beam into the arm cavities. We used PR2 and |
|
|
16758
|
Wed Apr 6 01:20:48 2022 |
Koji | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Xarm | PR2/PR3 Output R for fame OSEMS reduced
from 1.2K to 1.2K//100Ohm
I |
|
|
16759
|
Wed Apr 6 12:03:51 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Yarm | [Anchal, Paco]
After Koji reduced the output resistors
on PR2/PR3 coil drivers, we got much better |
|
|
16760
|
Wed Apr 6 22:51:47 2022 |
Koji | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Xarm | [Yuta Koji]
We took out the two coil driver
units for PR3 and the incorrect arrangement |
|
|
16761
|
Thu Apr 7 11:47:22 2022 |
Yehonathan | Update | BHD | Initial BHD modeling: AS - LO mode matching |
I begin modeling the initial BHD |
|
|
16762
|
Thu Apr 7 17:59:51 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Yarm | [Anchal, Paco, JC, Tega]
Today we have aligned the Yarm
cavity for IR, with verified 1.5 roundtrips. |
|
|
16763
|
Thu Apr 7 20:33:42 2022 |
Tommy | Update | Electronics | RFSoC 2x2 board -- setup for remote work | To access the board remotely through the
40m lab ethernet port, use
ssh -N -L localhost:1137:localhost:9090 |
|
|
16764
|
Thu Apr 7 20:37:06 2022 |
Tommy | Update | Electronics | RFSoC 2x2 Board -- Simple Tone Generator | In the "Tommy" sub folder, I
created a new notebook called "SimpleToneGenerator".
This tunes the DAC and ADC mixers to a single |
|
|
16765
|
Thu Apr 7 20:41:15 2022 |
Tommy | Update | Electronics | RFSoC 2x2 Board -- Gain Plotter | In this file (under Tommy), we have a notebook
which runs through a spectrum of frequencies
and determines the gain response of the attached |
|
|
16766
|
Thu Apr 7 21:15:04 2022 |
Yehonathan | Update | BHD | Initial BHD modeling: AS - LO mode matching | Ok, it turns out these optics were purchased
on purpose, as this elog
shows. Jon considered building a mode-matching |
|
|
16767
|
Fri Apr 8 16:03:58 2022 |
rana | Update | Electronics | RFSoC 2x2 board -- setup for remote work & BALUN saga | Seems like it should be possible to just
remove the transformer (aka as a BALUN ...
BALanced, UNbalanced), or replace it with |
|
|
16768
|
Fri Apr 8 17:21:31 2022 |
Ian MacMillan | Summary | BHD | Part IIa of BHR upgrade - IR laser alignment on Yarm | [Ian, Paco, Tega]
Paco and I opened the ETMY and
ITMY chamber to work on yesterdays efforts |
|
|
16769
|
Mon Apr 11 11:00:30 2022 |
Jancarlo | Update | VAC | C1VAC Reboot and Nitrogen tanks | [Paco, JC, Ian, Jordan, Chub]
Checking in the morning, I walked
over to the Nitrogen tanks to check the levels. |
|
|
16770
|
Mon Apr 11 21:13:21 2022 |
Paco | Summary | BHD | Part IIa of BHR upgrade - POY11 debugging | [Paco, Koji]
I asked Koji for some advice regarding
closing the loop on YARM using POY11. A few |
|
|
16771
|
Mon Apr 11 21:44:14 2022 |
Koji | Summary | BHD | Part IIa of BHR upgrade - POY11 debugging | We took out the right most PD interface
board D990543 and removed the 74LS04 chips.
In fact two out of 4 were already replaced |
|
|
16772
|
Tue Apr 12 09:05:21 2022 |
Jordan | Update | VAC | New Pressure Gauge Install/Pump Spool Vent | Today, Tega and I would like to vent the
pump spool an dinstall the new FRG-400 Agilent
Pressure Gauges (per elog 15703). The attached |
6x |
|
16773
|
Wed Apr 13 12:50:07 2022 |
Tega | Update | VAC | New Pressure Gauge Install/Pump Spool Vent | [Jordan, JC, Tega]
We have installed all the FRGs
and updated the VAC medm screens to display |
|
|
16774
|
Wed Apr 13 15:57:25 2022 |
Ian MacMillan | Update | Cameras | Camera Battery Test | Tested the Nikon batteries for the camera.
they are supposed to be 7V batteries but
they don't hold a charge. I confirmed |
|
|
16775
|
Wed Apr 13 16:23:54 2022 |
Ian MacMillan | Update | General | Smell in 40m | [Ian, Paco, JC]
There is a strange smell in the
40m. It smells like a chemically burning |
|
|
16776
|
Wed Apr 13 18:55:54 2022 |
Koji | Update | Cameras | Camera Battery Test | I believe that the Nikon has an exposure
problem and that's why we bought the
Canon. |
|
|
16777
|
Thu Apr 14 09:04:30 2022 |
Jordan | Update | VAC | RGA Volume RGA Scans | Prior to venting the RGA volume on Tuesday
(4/12/2022) I took an RGA scan of the volume
to be vented (RGA+TP1 volume+Manual Gate |
|
|
16778
|
Thu Apr 14 10:18:35 2022 |
Paco | Summary | BHD | 2 in oplev mirrors incompatible with LMR2V | [Paco, JC]
We realized the 2 in oplev mirrors
(Thorlabs BB2-E02) for ITMYOL, SRMOL, and |
|
|
16779
|
Thu Apr 14 11:52:57 2022 |
yehonathan | Summary | BHD | Part IIa of BHR upgrade - POY11 debugging | {JC, Paco, Yehonathan, Ian}
POY lens was moved to infront of
the POY steering mirror to make the POU beam |
|
|
16780
|
Thu Apr 14 18:34:51 2022 |
Paco | Summary | BHD | ITMY Oplev reinstalled (Re: 2 in oplev mirrors incompatible with LMR2V) | [Paco, Yehonathan]
We installed ITMYOL1 and ITMYOL2
on the ITMY chamber. We aligned the ITMY |
|
|
16781
|
Thu Apr 14 18:39:13 2022 |
Paco | Summary | BHD | Part IIa of BHR upgrade - POY11 debugging | [Paco]
In reply to Koji's questions;
Q1: What is the product number |
|
|
16782
|
Fri Apr 15 11:59:16 2022 |
Yehonathan | Update | IOO | IMC completely misaligned | Came this morning, opened the PSL and there
was not even a beam on the MC REFL.
Looking at the big monitor it seems |
|
|
16783
|
Mon Apr 18 14:52:47 2022 |
Ian MacMillan | Summary | SEI | Seismic Study of Buildings and Caltech Campus | [Ian, JC]
I want to take measurements of
seismic noise at different places on Caltech's |
7x |
|
16784
|
Mon Apr 18 15:17:31 2022 |
Jancarlo | Update | General | Tool box and Work Station Organization | I cleaned up around the 40 m lab. All the
Laser Safety Glasses have been picked up
and placed on the rack at the entrance. |
|
|
16785
|
Mon Apr 18 16:09:07 2022 |
Yehonathan | Update | BHD | BHD Readout simulation | I'm planning on simulating the BHD
readout noise in a manner very similar to
the ALS noise model using Simulink. I've |
|
|
16786
|
Mon Apr 18 17:53:45 2022 |
Paco | Summary | BHD | Part IIa of BHR upgrade - POY11 debugging | [Paco, Ian]
We aligned the X-arm IR laser
First fix pointing on the |
|
|
16787
|
Mon Apr 18 23:22:39 2022 |
Koji | Update | General | Tool box and Work Station Organization | Whoa! Thanks! |
|
|
16788
|
Tue Apr 19 18:10:10 2022 |
Paco | Update | BHD | Part V of BHR upgrade - POX11 path, LO path, and ITMX Oplev | [Yuta, Paco]
We set up POX11 beam path from
ITMX chamber to the ITMX in-air table. To |
|
|
16789
|
Wed Apr 20 08:20:22 2022 |
Paco | Update | BHD | Part V of BHR upgrade - PR2 weirdness | Yesterday, I tried tuning the PR2 damping
gains by increasing the gain until the damping
gave the ~5 oscillations (by watching the |
|
|
16790
|
Wed Apr 20 14:56:06 2022 |
Tommy | Update | Electronics | RFSoC 2x2 board -- setup for remote work & BALUN saga | Here are a few options for replacement
BALUNs from Mini Circuits and specs:
Current. TCM1-83X+, 10-8000 MHz, |
|
|
16791
|
Wed Apr 20 16:11:08 2022 |
Koji | Update | SUS | Outpur resistors updated for LO1 coil drivers / for SR2, LO2, AS1, and AS4 in progress | [JC Koji]
To give more alignment ranges for
the SUS alignment, we started updating the |
6x |
|
16792
|
Wed Apr 20 18:50:03 2022 |
Koji | Update | BHD | Part V of BHR upgrade - PR2 weirdness | It seemed that it comes from the servo
oscillation. This does not happen when the
output limitters were set to be 100-ish. |
|
|
16793
|
Thu Apr 21 10:35:23 2022 |
Koji | Update | CDS | DAQ seemed down | Yesterday, when I worked on the damping
servo, I found that any of the daqvtools
(ndscope, dtt, dataviewer,...) is not available. |
|
|
16794
|
Thu Apr 21 11:31:35 2022 |
JC | Update | VAC | Gauges P3/P4 | [Jordan, JC]
It was brought to attention during
yesterday's meeting that the pressures |
|
|
16795
|
Thu Apr 21 15:22:44 2022 |
Koji | Update | SUS | Outpur resistors updates for SR2, LO2, AS1, and AS4 done | [JC Koji]
Quick report: JC has done all the
mods for the coil driver circuit in the morning |
|
|
16796
|
Thu Apr 21 16:36:56 2022 |
Tega | Update | VAC | cleanup work for vacuum git repo | git repo - https://git.ligo.org/40m/vac
Finally incorporated the FRGs into
the main modbusIOC service and everything |
|
|
16797
|
Thu Apr 21 16:49:01 2022 |
Paco | Update | BHD | Part V of BHR upgrade - BS Oplev + LO1 offset | [Paco, JC, Yuta]
We aligned the BS oplev using the
new BSOL mirror pair. The main change is |
|