| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16638
|
Wed Feb 2 16:27:57 2022 |
Anchal | Summary | BHD | Part III of BHR upgrade - PR3 inpute matrix diagonalized | The
free swinging test was successful. I
ran the input matrix diagonalization code |
|
|
16639
|
Wed Feb 2 16:32:02 2022 |
Anchal | Summary | BHD | Part IX of BHR upgrade - AS1 free swing test still not good | We still did not get a good AS1 free swinging
spectrum. It seems the Side OSEM is reporting
coupling to too many DOFs and some extra |
|
|
16640
|
Wed Feb 2 18:55:58 2022 |
Koji | Summary | BHD | Optomechanics configuration for the in-vacuum aux small optics | Here is more detail of the POP_SM4
mount assembly.
It's a combination of BA2V |
|
|
16641
|
Wed Feb 2 21:16:23 2022 |
Koji | Summary | BHD | Optomechanics configuration for the in-vacuum aux small optics | Asked Jordan to clean 2x 1.5" posts
(0.5 dia) and a washer with 1" dia.
|
|
|
16678
|
Thu Feb 24 18:05:58 2022 |
Yehonathan | Update | BHD | Re-susspension of AS1 | {Yehonathan, Anchal, Paco}
Yesterday, Anchal and Paco removed
AS1 from the vacuum chamber and moved it |
|
|
16694
|
Wed Mar 2 14:02:43 2022 |
Yehonathan | Update | BHD | Re-susspension of AS1 | Yesterday, I rebuilt the OpLev setup in
the cleanroom in order to suspend AS1. It
took me a while to find all the necessary |
|
|
16698
|
Thu Mar 3 17:09:46 2022 |
Paco | Update | BHD | Re-susspension of AS1 | [Anchal, Paco]
Wire clamp spare was installed,
furthermore AS1 was reinstalled on adapter, |
|
|
16710
|
Mon Mar 7 16:56:08 2022 |
Yehonathan | Update | BHD | Re-susspension of AS1 | {Paco, Yehonathan}
We tried to roughly balance the
adapter with two counterweights at the front, |
|
|
16711
|
Mon Mar 7 18:53:16 2022 |
Koji | Update | BHD | Re-susspension of AS1 | Not sure if that small difference can cause
the alignment inability. Particularly, the
removed metal was just below the wire. This |
|
|
16714
|
Tue Mar 8 12:24:13 2022 |
Yehonathan | Update | BHD | Re-susspension of AS1 | The gluing seemed to be successful. I assembled
the side block with the magnet on the adapter.
Paco helped me hang the adapter on the SOS |
|
|
16715
|
Tue Mar 8 19:29:36 2022 |
Paco | Update | BHD | Re-balance of AS1 | [Paco]
Installed AS1 in vacuum, near the
center of the table, and installed the OSEMs. |
|
|
16716
|
Wed Mar 9 09:35:26 2022 |
Paco | Update | BHD | Re-balance of AS1 | [Paco]
AS1 is installed, OSEMs balanced,
and the optic damped successfully. We should |
|
|
16718
|
Wed Mar 9 11:52:18 2022 |
Yehonathan | Update | BHD | Simplified BHD readout sketch on ITMY table | I have made an editable
draw.io diagram of the planned simplified
BHD setup on the ITMY table (see attached). |
|
|
16719
|
Wed Mar 9 12:57:52 2022 |
Koji | Update | BHD | Simplified BHD readout sketch on ITMY table | - BHD beams were already mixed in the chamber.
So we don't need a BS on the table. (Probably
there is no BS already) |
|
|
16729
|
Tue Mar 15 18:42:37 2022 |
Anchal | Summary | BHD | Part IX of BHR upgrade - AS1 resuspended and OSEMs tuned | http://nodus.ligo.caltech.edu:8080/40m/16722
http://nodus.ligo.caltech.edu:8080/40m/16716 |
|
|
16730
|
Tue Mar 15 18:45:12 2022 |
Anchal | Summary | BHD | Part X of BHR upgrade - BHDBS Path setup | [Paco, Anchal]
BS Chamber work
ASL
was positioned in nominal place.
PR3 |
|
|
16732
|
Thu Mar 17 16:50:53 2022 |
Paco | Update | BHD | XARM AUX alignment | [Ian, Paco]
We opened the ITMX chamber and
Inspected PR2 and LO1 and |
|
|
16733
|
Thu Mar 17 17:23:22 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - Green laser alignment | [Anchal, Yehonathan] (on Y Arm)
We first checked if the PZT mirrors
M1 and M2 can be controlled. They indeed |
|
|
16735
|
Fri Mar 18 17:15:19 2022 |
Paco | Update | BHD | XARM AUX alignment cont. | [Paco, Ian]
First, we re-balanced the ITMX
OSEMs so that they would damp at around half-a-shadow. |
|
|
16739
|
Mon Mar 21 18:00:05 2022 |
Ian MacMillan | Update | BHD | XARM AUX alignment cont. | [Ian, Paco]
Continuing with the previous alignment
that we stoped on friday, we re set up my |
|
|
16740
|
Mon Mar 21 18:24:07 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - Green laser alignment on Yarm | [Anchal, Tega]
We did the following alignment
steps on Yarm today: |
|
|
16742
|
Thu Mar 24 19:20:28 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - Green laser alignment on Yarm | [Anchal, Paco]
Uneloged: yesterday, Paco
and Ian tried locking the green laser on |
|
|
16744
|
Fri Mar 25 18:20:28 2022 |
Anchal | Summary | BHD | Part IIa of BHR upgrade - Green laser alignment on Yarm | [Anchal, Paco, Shruti]
Today we found out that
the laser controller at the Yend had it's |
|
|
16745
|
Sat Mar 26 13:04:38 2022 |
Paco | Summary | BHD | Part IIa of BHR upgrade - Green laser alignment on Yarm | I came for a bit to check on the "1Y0
burning smell" reported by Koji last
evening. I agree that there's a toasty |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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) |
|
|
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 |
|
|
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. |
|