40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
40m Log |
Not logged in |
 |
|
Wed Nov 4 00:10:43 2020, gautam, Update, General, Vent activities today    
|
Thu Nov 5 22:27:34 2020, gautam, Update, General, Vent activities today
|
Fri Nov 6 11:36:37 2020, gautam, Update, General, ETMY suspension eigenmodes 
|
Tue Nov 10 15:13:41 2020, rana, Update, General, ETMY suspension eigenmodes
|
Thu Nov 12 14:26:35 2020, gautam, Update, General, ETMY suspension eigenmodes
|
Sun Nov 8 20:22:35 2020, gautam, Update, General, Vent activities today
|
Sun Nov 8 23:24:29 2020, Koji, Update, General, Vent activities today
|
Mon Nov 9 17:40:17 2020, gautam, Update, General, Pumpdown 
|
Tue Nov 10 11:31:13 2020, Koji, Update, General, Pumpdown
|
|
Message ID: 15664
Entry time: Sun Nov 8 20:22:35 2020
In reply to: 15660
Reply to this: 15665
15666
|
Author: |
gautam |
Type: |
Update |
Category: |
General |
Subject: |
Vent activities today |
|
|
Basic IFO alignment checks were done.
- IMC could be locked - I tweaked the cavity alignment a little to maximize the MC transmission.
- Y arm can be made resonant for a TEM00 mode of the main beam. I can't run ASS successfully in this low power config. I can see that the axis isn't great, the spot is visually off-center on ITMY, but we should have plenty of actuator range to correct for this with TT1/TT2.
- X arm shows IR mode flashes in the TRX QPD. The green beam can be made resonant for a TEM00 mode, but that alignment doesn't yield the largest IR resonant peaks in TRX. I suspect it is due to the mis-alignment of the beam axis.
- AS beam was aligned onto the CCD. I could see clean Michelson fringes by tweaking the BS alignment. On the AP table, I noticed that the beam on the first steering mirror after the AS beam exits the vacuum is a little high. We can easily resolve this by tweaking OM6 pitch a bit, but even if we don't I don't see any major issues as there is plenty of clearance w.r.t. the viewport when the beam exits the vacuum.
- With the PRM aligned, I can see the REFL beam on the CCD, and it doesn't look clipped.
- I didn't bother to align the green beams to the arm cavities or re-center the Oplevs - is this necessary? It is a step in the pre-close up checklist, so maybe we should do it... The green transmission does reach the PSL table...
Tomorrow, we should do some visual checks of the chambers / EQ stops on ETMY etc but I don't see any major problems at the moment...
Quote: |
Barring any catastrophic failures and provided all required personnel are available, we will do the final pre-close-up checks, put the heavy doors back on, and pump down starting 10 am Monday, 9 Nov 2020.
|
|
|
|