| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14494
|
Thu Mar 21 21:50:31 2019 |
rana | Update | VAC | Protection against AC power loss | agreed - we need all pumps on UPS for their
safety and also so that we can spin them
down safely. Can you and Chub please find |
|
|
8727
|
Wed Jun 19 18:24:14 2013 |
Jenne | Update | CDS | Proto-ASC implemented in ASS model | I have implemented a proto-ASC in the ASS
model.
In an ASC block within the ASS model, |
|
|
8739
|
Mon Jun 24 16:41:40 2013 |
Jenne | Update | CDS | Proto-ASC implemented in ASS model | I am working on making the Proto-ASC less
"proto". I have put IPC senders
in the LSC model to send the cavity trigger |
|
|
8740
|
Tue Jun 25 00:13:00 2013 |
Jenne | Update | CDS | Proto-ASC implemented in ASS model | I have finished my work on the LSC and
ASS models for now. The triggering is all
implemented, and should be ready to go. |
|
|
8860
|
Tue Jul 16 18:20:25 2013 |
Jenne | Update | CDS | Proto-ASC implemented in ASS model | The proto-ASC now includes triggering.
I have updated the hacky temp ASC screen
to show the DoF triggering. I have |
|
|
951
|
Tue Sep 16 16:47:01 2008 |
pete | Configuration | PSL | Prototype FSS reference installed | After verifying output, I installed the new
prototype 21.5 MHz FSS reference (Wenzel
crystal oscillator and ZHL-2 amp). Yoichi |
|
|
4228
|
Sun Jan 30 19:26:03 2011 |
Koji | Summary | Green Locking | Prototype freq divider | A prototype freq divider has been made
which works up to ~40MHz.
74HC4060 (14bit binary ripple counter) |
|
|
5976
|
Tue Nov 22 06:12:43 2011 |
Zach | Update | RF System | Prototype temperature controller | Tonight I built a simpler version of |
|
|
14223
|
Mon Oct 1 22:20:42 2018 |
gautam | Update | SUS | Prototyping HV Bias Circuit | Summary:
I've been plugging away at
Altium prototyping the high-voltage bias |
|
|
8132
|
Thu Feb 21 18:10:13 2013 |
rana | Update | SEI | Pump Down misalignments | This plot shows the trend of the OL during
the past several hours of roughing pumping.
The big steps at the start of the |
|
|
8948
|
Wed Jul 31 21:12:05 2013 |
manasa | Update | General | Pump down called off | [Koji, Manasa]
We missed to check that we had the green |
|
|
5357
|
Wed Sep 7 12:03:49 2011 |
steve | Update | VAC | Pump down has started | Jamie and Steve
We closed ITMX and ITMY chambers
and started pumping around 11am |
|
|
15666
|
Mon Nov 9 17:40:17 2020 |
gautam | Update | General | Pumpdown | [koji, rana, gautam]
1100 - EY chamber inspected, no
issues were found --> EY heavy door on |
|
|
15667
|
Tue Nov 10 11:31:13 2020 |
Koji | Update | General | Pumpdown | Main volume pressure as of 11:30AM 2020/11/10 |
|
|
12575
|
Thu Oct 20 15:59:52 2016 |
Steve | Update | VAC | Pumpdown 80 has completed | IFO pressure 1.7E-4 Torr on new not logged
cold cathode gauge. P1 <7E-4 Torr
|
|
|
12574
|
Thu Oct 20 09:17:08 2016 |
Steve | Update | VAC | Pumpdown 80 has started | Pumping again after 7 days at atmosphere.
BS, ITMY and OMC chambers were
open only. |
|
|
14426
|
Fri Feb 1 13:16:50 2019 |
gautam | Update | SUS | Pumpdown 83 underway | [chub, bob, gautam]
Steps described in previous
elog were carried out
EY heavy |
|
|
14428
|
Fri Feb 1 21:52:57 2019 |
gautam | Update | SUS | Pumpdown 83 underway | [jon, koji, gautam]
IFO is at ~1 mtorr, but
pressure is slowly rising because of outgassing |
|
|
8976
|
Wed Aug 7 10:51:49 2013 |
Steve | Update | VAC | Pumpdown at 26hrs | Cold cathode gauge CC1 -h (horizontal)
just coming on 9.2e-5 Torr
P2 is the fore line pressure of the |
|
|
17667
|
Wed Jul 5 11:43:23 2023 |
JC | Update | VAC | Pumpdown begun this morning | [JC, Radhika]
The vacuum system went down over
the weekend due to a loss of N2 pressure |
|
|
8970
|
Tue Aug 6 10:06:29 2013 |
Steve | Update | VAC | Pumpdown is at 500Torr | The pumpdown has started at 8:38am
Manasa was here to confirm good alignment
of the IFO |
|
|
8973
|
Tue Aug 6 16:45:31 2013 |
Steve | Update | VAC | Pumpdown is completed | IFO P1=1mT PSL shutter is opened
|
|
|
14369
|
Wed Dec 19 19:51:19 2018 |
gautam | Update | General | Pumpdown prep | [Koji,
gautam]
Summary: |
|
|
14631
|
Wed May 22 22:50:13 2019 |
gautam | Update | VAC | Pumpdown prep | I did the following:
Checked the ETMY OSEM sensing
matrix and OSEM actuation matrix - more on |
|
|
14370
|
Wed Dec 19 21:14:50 2018 |
gautam | Update | VAC | Pumpdown tomorrow | I just spoke to Jon who asked me to make
this elog - we will be ready to test one
or more parts of the pumpdown procedure tomorrow |
|
|
14372
|
Thu Dec 20 08:38:27 2018 |
Jon | Update | VAC | Pumpdown tomorrow | Linked is the pumpdown
procedure, contained in the old 40m documentation.
The relevant procedure is "All Off --> |
|
|
14634
|
Thu May 23 15:30:56 2019 |
gautam | Update | VAC | Pumpdown underway - so far so good! | [chub, koji, gautam]
We executed the pre-pumpdown
tasks per the checklist - heavy doors were |
|
|
17662
|
Wed Jun 28 10:23:23 2023 |
Hiroki | Update | VAC | Pumping down | [Koji, Mayank, Hiroki]
As Mayank and Koji solved the issue
of opening the gate valves yesterday (ID: |
|
|
17665
|
Thu Jun 29 20:10:17 2023 |
Koji | Update | VAC | Pumping down | Towards Vacuum Normal
Closed V7 (Main volume
pumped by TP1/TP2)
Opened VA6 |
|
|
17678
|
Tue Jul 11 17:21:58 2023 |
Koji | Update | VAC | Pumping down | Manually switched TP2 to "Low Speed
(LS)" mode (aka "Stand by")
|
|
|
17661
|
Tue Jun 27 19:49:37 2023 |
Koji | Update | VAC | Pumping down attemp | [Mayank, Hiroki, Yuta, JC, Koji]
After JC came back from the optical
table placement at Synchrotron, we tried |
|
|
64
|
Mon Nov 5 22:24:38 2007 |
Andrey, Steve | Omnistructure | VAC | Pumping down goes smoothly |
We (Steve and Andrey) started pumping down
at 3.25PM today. At 9 PM we turned off the |
|
|
16490
|
Mon Dec 6 14:26:52 2021 |
Koji | Update | VAC | Pumping down the RGA section | Jordan reported that the RGA section needs
to be pumped down to allow the analyzer to
run at sufficiently low pressure (P<1e-4 |
|
|
16493
|
Tue Dec 7 13:12:50 2021 |
Koji | Update | VAC | Pumping down the RGA section | So that Jordan can run the RGA scan this
afternoon, I ran TP3 and started pumping
down the RGA section. |
|
|
16494
|
Wed Dec 8 10:14:43 2021 |
Jordan | Update | VAC | Pumping down the RGA section | After an overnight pumpdown/RGA warm up,
I took a 100 amu scan of the RGA volume and
subsequent pumping line. Attached is a screenshot |
|
|
16501
|
Fri Dec 10 19:22:01 2021 |
Koji | Update | VAC | Pumping down the RGA section | The scan result was ~x10 higher than the
previously reported scan on 2020/9/15 (https://nodus.ligo.caltech.edu:8081/40m/15570), |
|
|
14406
|
Fri Jan 18 17:44:14 2019 |
gautam | Update | VAC | Pumping on RGA volume | Steve came by the lab today, and looked
at the status of the upgraded vacuum system.
He recommended pumping on the RGA volume, |
|
|
15393
|
Thu Jun 11 17:35:34 2020 |
gautam | Update | VAC | Pumpspool UPS needs battery replacement | Summary:
The pumpspool UPS has its " |
|
|
15394
|
Fri Jun 12 01:23:32 2020 |
Koji | Update | VAC | Pumpspool UPS needs battery replacement | 1. I agree that it's likely that it
was the temp signal glitch.
Recom #2: I approve to reopen the |
|
|
15396
|
Fri Jun 12 17:32:40 2020 |
Koji | Update | VAC | Pumpspool UPS needs battery replacement | Jon and Koji remotely supported Jordan's
resetting the TP2 controller.
Here |
|
|
15397
|
Fri Jun 12 19:02:52 2020 |
gautam | Update | VAC | Pumpspool UPS needs battery replacement | I still don't understand why restoring
the vacuum is contingent on this functionality
working. All the TPs have their own internal |
|
|
15398
|
Fri Jun 12 19:23:56 2020 |
Koji | Update | VAC | Pumpspool UPS needs battery replacement | The vacuum safety policy and design are
not clear to me, and I don't know what
the first and second defense is. Since we |
|
|
15399
|
Fri Jun 12 19:33:31 2020 |
gautam | Update | VAC | Pumpspool UPS needs battery replacement | Didn't mean to sound whiny. I will
wait until the vacuum team tells me it is
okay. |
|
|
12338
|
Tue Jul 26 16:01:32 2016 |
Steve | Summary | VAC | Purge compressed air system | Thanks for checking this out Koji
The builder in 1996 was Process
System International, Inc ( Westborough, |
|
|
12339
|
Tue Jul 26 17:41:59 2016 |
Koji | Summary | VAC | Purge compressed air system | We have no number for the CFM without calculation.
We can't assume a random number like
10-15 |
|
|
12337
|
Tue Jul 26 14:24:38 2016 |
Koji | Summary | VAC | Purge compressed air system at LHO | I've visited the purge clean
air system at LHO Yarm mid-station with John
Worden. |
12x |
|
9440
|
Wed Dec 4 15:43:13 2013 |
Jenne | Summary | LSC | Put LSC DAQ channels back | Last week, Koji cleaned up the LSC model
to make it much more readable, while he was
working on piping the ALS signals to the |
|
|
4138
|
Tue Jan 11 18:41:43 2011 |
Jenne | Update | IOO | Put MC PZT offset onto MC board, instead of on awkward cart | [Larisa and Jenne]
We wanted to get rid of the awkward
cart that was sitting behind the 1Y1 rack. |
|
|
4140
|
Wed Jan 12 01:38:52 2011 |
Koji | Update | IOO | Put MC PZT offset onto MC board, instead of on awkward cart | I can not think of any reason that the
input impedance of 13kOhm between the pos/neg
inputs produces such a big change at the |
|
|
4147
|
Wed Jan 12 22:39:16 2011 |
Suresh | Update | IOO | Put MC PZT offset onto MC board, instead of on awkward cart |
|
|