| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16149
|
Fri May 21 00:05:45 2021 |
Koji | Update | SUS | New electronics: Sat Amp / Coil Drivers | 11 new Satellite Amps were picked up from
Downs. 7 more are coming from there. I have
one spare unit I made. 1 sat amp has already |
|
|
16150
|
Fri May 21 00:15:33 2021 |
Koji | Update | Electronics | DC Power Strip delivered / stored | DC Power Strip Assemblies delivered and
stored behind the Y arm tube (Attachment
1) |
9x |
|
16158
|
Mon May 24 20:55:00 2021 |
Koji | Summary | BHD | How to align two OMCs on the BHD platform? | Differential
misalignment of the OMCs
40m BHD will employ two OMCs on |
|
|
16172
|
Wed Jun 2 01:03:19 2021 |
Koji | Update | BHD | SOS assembly | Can you just cut the viton tips smaller?
If you cut it to have some wedge (or say,
taper), it can get stuck with the vent hole. |
|
|
16173
|
Wed Jun 2 01:08:57 2021 |
Koji | Update | SUS | CoM to Clamping Point Measurement for 3" Adapter Ring | How about to use the non-Ag coated threaded
shaft + the end SS masses with helicoils
inserted? Does this save the masses to get |
|
|
16181
|
Thu Jun 3 22:08:00 2021 |
Koji | Update | CDS | Opto-isolator for c1auxey | - Could you explain what is the blue thing
in Attachment 1?
- To check the validity of the |
|
|
16184
|
Sun Jun 6 03:02:14 2021 |
Koji | Update | CDS | Opto-isolator for c1auxey | This RTS also use the BO interface with
an opto isolator. https://dcc.ligo.org/LIGO-D1002593
Could you also include the pull |
|
|
16198
|
Fri Jun 11 20:19:50 2021 |
Koji | Summary | BHD | BHD OMC invacuum wiring | Stephen and I discussed the in-vacuum OMC
wiring.
- One of the OMCs has already been |
|
|
16203
|
Tue Jun 15 21:48:55 2021 |
Koji | Update | CDS | Opto-isolator for c1auxey | If my understanding is correct, the (photo
receiving) NPN transistor of the optocoupler
is energized through the acromag. The LED |
|
|
16206
|
Wed Jun 16 19:34:18 2021 |
Koji | Update | General | HVAC | I made a flow sensor with a stick and tissue
paper to check the airflow.
- The HVAC indicator was not lit, |
|
|
16211
|
Thu Jun 17 22:19:12 2021 |
Koji | Update | Electronics | 25 HAM-A coil driver units delivered | 25 HAM-A coil driver units
were fabricated by Todd and I've transported
them to the 40m. |
|
|
16212
|
Thu Jun 17 22:25:38 2021 |
Koji | Update | SUS | New electronics: Sat Amp / Coil Drivers | It is a belated report: We received 5 more
sat amps on June 4th. (I said 7 more but
it was 6 more) So we still have one more |
|
|
16216
|
Fri Jun 18 23:53:08 2021 |
Koji | Update | BHD | SOS assembly | Then, can we replace the four small EQ
stops at the bottom (barrel surface) with
two 1/4-20 EQ stops? This will require drilling |
|
|
16223
|
Thu Jun 24 16:40:37 2021 |
Koji | Update | SUS | MC lock acquired back again | [Koji, Anchal]
The issue
of the PD output was that the PD whitened |
|
|
16240
|
Tue Jul 6 17:40:32 2021 |
Koji | Summary | General | Lab cleaning | We held the lab cleaning for the
first time since the campus reopening (Attachment
1). |
7x |
|
16246
|
Wed Jul 14 19:21:44 2021 |
Koji | Update | General | Brrr | Jordan reported on Jun 18, 2021:
"HVAC tech came today, and replaced |
|
|
16250
|
Sat Jul 17 00:52:33 2021 |
Koji | Update | General | Canon camera / small silver tripod / macro zoom lens / LED ring light borrowed -> QIL | Canon camera / small silver tripod / macro
zoom lens / LED ring light borrowed ->
QIL |
|
|
16252
|
Wed Jul 21 14:50:23 2021 |
Koji | Update | SUS | New electronics | Received:
Jun 29, 2021 BIO I/F 6 units
Jul 19, 2021 PZT Drivers x2 / QPD |
|
|
16255
|
Sun Jul 25 18:21:10 2021 |
Koji | Update | General | Canon camera / small silver tripod / macro zoom lens / LED ring light returned / Electronics borrowed | Camera and accesories returned
One HAM-A coildriver and one sat
amp borrowed -> QIL |
|
|
16260
|
Tue Jul 27 20:12:53 2021 |
Koji | Update | BHD | SOS assembly | 1 or 2. The stained ones are just fine.
If you find the vented 1/4-20 screws in the
clean room, you can use them. |
|
|
16278
|
Thu Aug 12 14:59:25 2021 |
Koji | Update | General | PSL shutter was closed this morning | What I was afraid of was the vacuum interlock.
And indeed there was a pressure surge this
morning. Is this real? Why didn't we |
|
|
16279
|
Thu Aug 12 20:52:04 2021 |
Koji | Update | General | PSL shutter was closed this morning | I did a bit more investigation on this.
- I checked P1~P4, PTP2/3, N2,
TP2, TP3. But found only P1a and P2 were |
|
|
16281
|
Tue Aug 17 04:30:35 2021 |
Koji | Update | SUS | New electronics | Received:
Aug 17, 2021 2x ISC Whitening
Delivered 2x Sat Amp board to Todd |
|
|
16284
|
Thu Aug 19 14:14:49 2021 |
Koji | Update | CDS | Time synchornization not running | 131.215.239.14 looks like Caltech's
NTP server (ntp-02.caltech.edu)
https://webmagellan.com/explore/caltech.edu/28415b58-837f-4b46-a134-54f4b81bee53 |
|
|
16288
|
Mon Aug 23 11:51:26 2021 |
Koji | Update | General | Campus Wide Power Glitch Reported: Monday, 8/23/21 at 9:30am | Campus
Wide Power Glitch Reported:
Monday, 8/23/21 at 9:30am (more like 9:34am |
|
|
16290
|
Mon Aug 23 19:00:05 2021 |
Koji | Update | General | Campus Wide Power Glitch Reported: Monday, 8/23/21 at 9:30am | Restarting the RTS was unsuccessful because
of the timing discrepancy error between the
RT machines and the FB. This time no matter |
|
|
16294
|
Tue Aug 24 18:44:03 2021 |
Koji | Update | CDS | FB is writing the frames with a year old date | Dan Kozak pointed out that the new frame
files of the 40m has not been written in
2021 GPS time but 2020 GPS time. |
|
|
16306
|
Wed Sep 1 21:55:14 2021 |
Koji | Summary | General | Towards the end upgrade | - Sat amp
mod and test: on going (Tega)
- Coil driver mod and test: on going |
|
|
16308
|
Thu Sep 2 19:28:02 2021 |
Koji | Update | | This week's FB1 GPS Timing Issue Solved | After the disk system trouble, we could
not make the RTS running at the nominal state.
A part of the troubleshoot FB1 was rebooted. |
|
|
16309
|
Thu Sep 2 19:47:38 2021 |
Koji | Update | CDS | This week's FB1 GPS Timing Issue Solved | After the reboot daqd_dc was not working,
but manual starting of open-mx / mx services
solved the issue. |
|
|
16310
|
Thu Sep 2 20:44:18 2021 |
Koji | Update | CDS | Chiara DHCP restarted | We had the issue of the RT machines rebooting.
Once we hooked up the display on c1iscex,
it turned out that the IP was not given at |
|
|
16311
|
Thu Sep 2 20:47:19 2021 |
Koji | Update | CDS | Chiara DHCP restarted | [Paco, Tega, Koji]
Once chiara's DHCP is back,
things got much more straight forward. |
|
|
16312
|
Thu Sep 2 21:21:14 2021 |
Koji | Summary | Computers | Vacuum recovery 2 | Attachment 1:
We are pumping the main volume with
TP2. Once P1a reached the pressure ~2.2mtorr, |
|
|
16316
|
Wed Sep 8 18:00:01 2021 |
Koji | Update | VAC | cronjobs & N2 pressure alert | In the weekly meeting, Jordan pointed out
that we didn't receive the alert for
the low N2 pressure. |
|
|
16317
|
Wed Sep 8 19:06:14 2021 |
Koji | Update | General | Backup situation | Tega mentioned in the meeting that it could
be safer to separate some of nodus's
functions from the martian file system. |
|
|
16328
|
Tue Sep 14 17:14:46 2021 |
Koji | Update | SUS | SOS Tower Hardware | Yup this is OK. No problem.
|
|
|
16331
|
Tue Sep 14 19:12:03 2021 |
Koji | Summary | PEM | Excess seismic noise in 0.1 - 0.3 Hz band | Looks like this increase is correlated
for BS/EX/EY. So it is likely to be real.
Comparison between 9/15 |
|
|
16333
|
Wed Sep 15 23:38:32 2021 |
Koji | Update | ALS | ALS ASX PZT HV was off -> restored | It was known that the Y end ALS PZTs are
not working. But Anchal reported in the meeting
that the X end PZTs are not working too. |
|
|
16334
|
Wed Sep 15 23:53:54 2021 |
Koji | Summary | General | Towards the end upgrade | Ordered compoenents are in.
- Made 36 more Sat Amp internal
boards (Attachment 1). Now |
|
|
16335
|
Thu Sep 16 00:00:20 2021 |
Koji | Update | General | RIO Planex 1064 Lasers in the south cabinet | RIO Planex 1064 Lasers in the south cabinet
Property Number C30684/C30685/C30686/C30687 |
|
|
16336
|
Thu Sep 16 01:16:48 2021 |
Koji | Update | General | Frozen 2 | It happened again. Defrosting required. |
|
|
16341
|
Fri Sep 17 00:56:49 2021 |
Koji | Update | General | Awesome | The
Incredible Melting Man!
|
|
|
16342
|
Fri Sep 17 20:22:55 2021 |
Koji | Update | SUS | EQ M4.3 Long beach | EQ M4.3 @longbeach
2021-09-18 02:58:34 (UTC) / 07:58:34
(PDT) |
|
|
16344
|
Mon Sep 20 14:11:40 2021 |
Koji | Update | BHD | End DAC Adapter Unit D2100647 | I've uploaded the schematic and PCB
PDF for End DAC Adapter Unit D2100647.
Please review the design. |
|
|
16350
|
Mon Sep 20 21:56:07 2021 |
Koji | Update | Computers | Wifi internet fixed | Ug, factory resets... Caltech IMSS announced
that there was an intermittent network service
due to maintenance between Sept 19 and 20. |
|
|
16376
|
Mon Oct 4 18:00:16 2021 |
Koji | Summary | CDS | c1teststand problems summary | I don't know anything about
mx/open-mx, but you also need open-mx,don't
you? |
|
|
16378
|
Mon Oct 4 20:46:08 2021 |
Koji | Update | Electronics | Satellite amp box adapters | Thanks. You should be able to find the
chassis-related hardware on the left side
of the benchtop drawers at the middle workbench. |
|
|
16380
|
Tue Oct 5 17:01:20 2021 |
Koji | Update | Electronics | Sat Amp modifications | Make sure the inputs for the PD amps are
open. This is the current amplifier and we
want to leave the input pins open for the |
|
|
16387
|
Thu Oct 7 02:04:19 2021 |
Koji | Update | Electronics | Satellite amp adapter chassis | The 4 units of Satellite Amp Adapter were
done:
- The ears were fixed with the screws |
|
|
16397
|
Tue Oct 12 23:42:56 2021 |
Koji | Summary | CDS | Connected c1sus2 to martian network | Don't you need to add the new
hosts to /diskless/root/etc/rtsystab at fb1?
--> There looks many elogs talking about |
|