| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16840
|
Mon May 9 23:18:44 2022 |
Koji | Update | BHD | BHD Platform Progress status | I quickly ran the FEA model to check the
resonant freqs of the BHD platform.
The boundary conditions were: |
6x |
|
16839
|
Mon May 9 22:19:06 2022 |
Koji | Update | BHD | BHD Platform Progress status | [Don, Koji]
Don is working on finalizing the
BHD Platform design. All the components on |
|
|
16838
|
Mon May 9 18:49:05 2022 |
Tega | Update | BHD | Relocate green TRX and TRY PDs/cams/optics from PSL table to BS table | [Paco, Tega]
Started work on the relocating
the green transmission optics, cameras and |
|
|
16837
|
Mon May 9 18:43:03 2022 |
Anchal | Update | BHD | ITMX table layout corrected | As I went to correct the ITMX Oplev mirrors,
I found that both mirrors were placed in
very different positions than the design |
|
|
16836
|
Mon May 9 15:32:14 2022 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I made the first pass at a tool to measure
the quantization noise of specific filters
in the 40m system. The code for which can |
|
|
16835
|
Fri May 6 13:48:34 2022 |
Anchal | Update | BHD | WFS loop instability fixed | [Yuta, Anchal]
We investigated why WFS loop wasn't
working. It seemed like WFS1 PIT error signal |
|
|
16834
|
Thu May 5 17:50:48 2022 |
Yehonathan | Update | BHD | BHD Readout simulation | I have made a Simulink diagram to use in
the MICH modeling (attachment) for the homodyne
angle detection scheme. The model will be |
|
|
16833
|
Thu May 5 17:05:31 2022 |
Tega | Update | BHD | IMC & X/Y-arm alignment | [Yuta, Tega]
In order to setup POP camera and
RFPD on the ITMX table, we decided to first |
|
|
16832
|
Thu May 5 14:46:22 2022 |
Anchal | Update | BHD | POP beam height lowered, POP_SM4 raised | [Anchal, JC]
We first aligned the single arm
cavity resonance for both arms to get maximum |
|
|
16831
|
Wed May 4 18:52:43 2022 |
Tega | Update | BHD | POP beam too high at POP SM4 on the ITMX chamber | [Yuta, Tega]
We needed to sort out the POXDC
signal so we could work on X-arm alignment. |
|
|
16830
|
Wed May 4 15:08:59 2022 |
Tega | Update | BHD | XARM alignment to get flashing | [Yuta, Tega]
We aligned the BS, ITMY, and ETMY
PIT and YAW to get the flashing on X-arm |
|
|
16829
|
Wed May 4 13:09:42 2022 |
Anchal | Update | BHD | IMC table balanced again, IMC is locking, YARM is locking | [Paco, JC, Anchal]
We balanced the IMC table back
again to point that got us 50% of nominal |
|
|
16828
|
Tue May 3 21:07:17 2022 |
Yehonathan | Update | BHD | BHD Readout simulation | I feel like there is an instability in
my thought process on this. Before my tendency
to try to scale and generalize this problem |
|
|
16827
|
Tue May 3 21:05:23 2022 |
yuta | Update | BHD | AS path alignment, removing a lot of green stuff | [Tega, Yehonathan, Koji, Yuta]
We tried to align AS path this afternoon. |
7x |
|
16826
|
Tue May 3 14:02:09 2022 |
Anchal | Summary | BHD | Installed POP path in ITMX Chamber | [Anchal, JC]
I installed POP_SM4 and POP_SM5
in the ITMX chamber in the nominal positions. |
|
|
16825
|
Tue May 3 13:18:47 2022 |
JC | Update | VAC | RGA Pump Down | Jordan, Tega, JC
Issue has been resolved. Breaker
on RP1 was tripped so the RP1 button was |
|
|
16824
|
Mon May 2 17:51:30 2022 |
Anchal | Update | BHD | POX Beam aligned on RFPD, YARM locked | [Paco, Anchal]
We found that one of the Y1-1037-45P
marked mirror that we used was actually curved. |
|
|
16823
|
Mon May 2 13:30:52 2022 |
JC | Update | Coil Drivers | Coil Drivers Update | The DCC has been updated, along with the
modified schematic. Links have been attached.
|
|
|
16822
|
Mon May 2 10:00:34 2022 |
Jordan | Update | VAC | TP3 Forepump tip seal replacement | [JC, Jordan]
Jordan recieved the new tip seal
Friday afternoon and I continued the replacement |
|
|
16821
|
Sat Apr 30 13:29:33 2022 |
Paco | Update | BHD | POX Beam issues --- fixed, ASL alignment on vertex chamber | [Paco, Anchal, Yuta]
We opened the BSC and ITMX chamber
in the morning (Friday) to investigate POX11 |
|
|
16820
|
Fri Apr 29 08:34:40 2022 |
JC | Update | VAC | RGA Pump Down | Jordan and I, in order to start pumpig
down the RGA Volume, we began by opening
V7 and VM. Afterwards, we started RP1 and |
|
|
16819
|
Thu Apr 28 18:07:04 2022 |
Anchal | Update | BHD | Restoring arm alignment at EOD | Restored arm algiment to get 0.8 max flashing
on YARM and 1 max flashing on XARM. I had
to move input alignment using TT2-PR3 pair |
|
|
16818
|
Thu Apr 28 17:45:53 2022 |
Anchal | Update | BHD | POX Beam issues | [Anchal, Paco]
We investigated the low power issue
with POX11 photodiode. |
|
|
16817
|
Thu Apr 28 11:53:10 2022 |
Anchal | Summary | BHD | POP_SM4 and POP_SM5 Assembly | POP_SM4
I
tried out this stack today and found some
change of plans. |
|
|
16816
|
Thu Apr 28 09:12:18 2022 |
Anchal | Update | BHD | Restoring arm alignment | This would be a daily first task in the
morning. We'll need to check the status
of arm alignment and optimize it back to |
|
|
16815
|
Wed Apr 27 16:28:57 2022 |
Anchal | Summary | BHD | BHD Upgrade - Retreiving arm cavity alignment | [Anchal, Paco, JC]
We had to open ITMY, ETMY chamber
doors to get the cavity aligned again. Once |
|
|
16814
|
Wed Apr 27 10:05:55 2022 |
JC | Update | Coil Drivers | Coil Drivers Update | 18 (9 pairs) Coil Drivers have been modified.
Namely ETMX/ITMX/ITMY/BS/PRM/SRM/MC1/MC2/MC3.
|
|
|
16813
|
Tue Apr 26 16:23:22 2022 |
Tommy | Update | Electronics | RFSoC2x2 MTS | We connected a 8 MHz signal generator to
the device in order to sync up the ADCs and
DACs and hopefully get phase data. |
|
|
16812
|
Mon Apr 25 18:00:03 2022 |
Ian MacMillan | Update | Upgrade | Cable supports update | I have designed new cable supports for
the new ribbon cables running up the side
of the tables in the vacuum chambers. |
|
|
16811
|
Mon Apr 25 17:24:06 2022 |
Anchal | Update | CDS | DAQ still down | I investigated this issue today. At first,
it seemed that only new suspension testpoints
are inaccessible. I was able to use diaggui |
|
|
16810
|
Mon Apr 25 16:57:57 2022 |
Anchal | Update | BHD | Cable post installation | [Anchal, Tega, JC]
We installed cable posts in ITMY,
BS, and ITMX chambers for all the new suspensions. |
|
|
16809
|
Mon Apr 25 14:49:02 2022 |
Koji | Update | General | Nitrogen Tank | For your (and mine) info:
N2 pressure can be monitored on
the 40m summary page: https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20220425/vacuum/ |
|
|
16808
|
Mon Apr 25 14:19:51 2022 |
JC | Update | General | Nitrogen Tank | Coming in this morning, I checked on the
Nitrogen tanks to check the level. One of
the tanks were empty, so I went ahead and |
|
|
16807
|
Sun Apr 24 13:17:08 2022 |
Tommy | Update | Electronics | New RFSoC2x2 Overlay | We recieved an overlay from Chris Stoughton
which he used for a ZCU11 board. The overlay
is supposed to be compatible with the RFSoC |
|
|
16806
|
Fri Apr 22 14:14:33 2022 |
Jordan | Update | VAC | TP3 Forepump tip seal replacement | Jordan, JC
While the pumpspool is vented,
I thought it would be a convenient time to |
|
|
16805
|
Fri Apr 22 12:15:08 2022 |
Anchal | Update | BHD | Cable post installation | If someone gets time, let's put in
all the cable posts and clean up our cable
routing on the tables. |
|
|
16804
|
Fri Apr 22 12:09:51 2022 |
Anchal | Update | Coil Drivers | Please update DCC pages | Nice. Please put this information on the
DCC pages of the coil driver units. You'll
find links to all the units in this document |
|
|
16803
|
Fri Apr 22 12:03:09 2022 |
Tega | Update | BHD | AS1 UR OSEM problem localized in the chamber | [JC, Tega, Ian, Paco]
We found that the UR cable was
clamped to the table by one of the ITMY OPLEV |
|
|
16802
|
Fri Apr 22 07:01:58 2022 |
Jc | Update | Coil Drivers | Adding Resistors and Reinstalling | [Koji, JC]
Coil Drivers LO2, SR2, AS4, and
AS1 have been updated a reinstalled into |
8x |
|
16801
|
Thu Apr 21 20:33:31 2022 |
Koji | Update | BHD | AS1 UR OSEM problem localized in the chamber | Tega and Paco reported that the UR OSEM
of AS1 lost the response.
- I have checked the LED MON (left) |
|
|
16800
|
Thu Apr 21 18:42:47 2022 |
Tega | Update | BHD | Part V of BHR upgrade - Align LO and AS beams to BHD BS | [Tega, Yuta, Paco]
We tried aligning the LO and AS
beams on to the BHD beamsplitter. During |
|
|
16799
|
Thu Apr 21 18:18:42 2022 |
yehonathan | Update | BHD | POX Alignment | {Yehonathan, Paco}
BS, ITMX and ETMX were aligned
to get flashing in the X arm. |
|
|
16798
|
Thu Apr 21 17:32:35 2022 |
Ian MacMillan | Summary | SEI | Seismic Study of Buildings and Caltech Campus | [Rana, Ian]
We built a power supply for the
accelerometer shown in Attachment 1 based |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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 |