| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15685
|
Mon Nov 23 14:52:10 2020 |
Koji | Update | BHD | BHD MMT Optics delivered | Basically, they repeated our specs and
showed the coating performances for HR/AR
for 10deg P and PR/AR for 45deg P. There |
|
|
15727
|
Thu Dec 10 14:48:00 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I have rebuilt the MCMC simulation in an
OOP fashion and incorporated Lance/Pytickle
functionality into it. The usage of the MCMC |
|
|
15732
|
Fri Dec 11 09:28:52 2020 |
rana | Update | BHD | Monte Carlo loop coupling Simulations | Cool. Can you give us Bode plots of the
open loop gain for each of the 5 length control
loops? |
|
|
15734
|
Mon Dec 14 11:09:28 2020 |
Yehonathan | Update | BHD | Monte Carlo loop coupling Simulations | I spent a few hours monkeying around with
the control filters. They are totally made
up and also it's my first time trying |
|
|
15758
|
Mon Jan 11 16:11:51 2021 |
Yehonathan | Update | BHD | Monte Carlo loop coupling Simulations | I dived into the alog to make the OLTFs
in the MC_controls example more realistic.
I was mainly inspired by these entries: |
|
|
15759
|
Mon Jan 11 19:10:10 2021 |
rana | Update | BHD | Monte Carlo loop coupling Simulations |
looking better, but the CARM plot
still looks weird.
you should
plot from 0.01 - 10,000 Hz
All |
|
|
15774
|
Wed Jan 20 18:07:09 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements before modifications | I have taken transfer functions and noise
measurements of the two HAM-A coil driver
boxes D1100687 #S2100027 and #S2100028. All |
7x |
|
15776
|
Mon Jan 25 18:18:04 2021 |
Anchal | Summary | BHD | Satellite Amplifier Transfer Functions and noise |
I took transfer function and noise
measurement of satellite amplifier box's |
|
|
15780
|
Thu Jan 28 12:53:14 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements before modifications | I took some steps to reduce the coupling
of 60 Hz harmonics in noise measurement.
The box was transferred to the floor instead |
|
|
15781
|
Thu Jan 28 18:04:55 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications | I did the recommended
modifications on of the boards with serial
number S2100028. These included: |
|
|
15782
|
Thu Jan 28 21:44:45 2021 |
gautam | Summary | BHD | HAM-A Coil Driver measurements After modifications | Looks fine to me visually but the verdict
can only be made once the z:p locations are quantitatively confirmed,
and the noise tests pass. It would be interesting |
|
|
15784
|
Fri Jan 29 15:39:30 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications TF and Noise S2100027 | I fitted zeros and poles in the measured
transfer function of D1100687 S2100027 and
got zeros at 130 Hz and 234 Hz and poles |
|
|
15787
|
Tue Feb 2 11:57:46 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications TF and Noise S2100028 | I have made the modifications on the other
board D1100687 S2100028 as well. The measurements
were taken as mentioned in 40m/15784. |
|
|
15788
|
Tue Feb 2 17:09:17 2021 |
yehonathan | Update | BHD | SOS assembly | I set up a working area on the table next
to the south flow bench (see attachment).
I also brought in a rolling table for some |
|
|
15790
|
Tue Feb 2 18:24:54 2021 |
Koji | Update | BHD | SOS assembly | You can remove the components of the optical
table enclosure (black ones) and use the
optical table as your working area too. |
|
|
15793
|
Wed Feb 3 16:27:19 2021 |
Anchal | Summary | BHD | Satellite Amplifier Transfer Functions and noise After modifications | I have made modifications recommended in
this doc.
The changes made are: |
|
|
15796
|
Thu Feb 4 15:14:55 2021 |
Yehonathan | Update | BHD | SOS assembly | I gathered all the components I could find
from the SOS towers and the cleanroom and
put it all on the table next to the flow |
|
|
15797
|
Wed Feb 10 11:45:59 2021 |
Anchal | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | As suggested, I wrapped the satellite amplifier
box D10028128 S2100029 in blanket and foam
and took very low frequency spectrum starting |
6x |
|
15799
|
Wed Feb 10 15:07:50 2021 |
Anchal | Summary | BHD | Satellite Amplifier Output Offset measurements | I measured the output DC voltage of the
satellite amplifier box at PDMon port when
the PDA input was shorted |
|
|
15800
|
Wed Feb 10 15:25:45 2021 |
gautam | Summary | BHD | Satellite Amplifier Output Offset measurements | Why not just do this test with the dummy
suspension box and CDS system? I think Rich's
claim was that the intrinsic LED RIN was |
|
|
15801
|
Wed Feb 10 17:18:03 2021 |
Koji | Summary | BHD | Satellite Amplifier Output Offset measurements | Testing the satellite amp i.e.
PD driver
- To test the noise of the PD transimpedance |
|
|
15803
|
Thu Feb 11 11:10:05 2021 |
Anchal | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | Here is a proper measurement for PD transimpedance
amplifier circuit in the Satellite amplifier
box D1002818 S2100029. The input from rear |
|
|
15804
|
Thu Feb 11 16:58:52 2021 |
rana | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | I expect that a single OSEM channel can't
be better than 1e-10 m/rHz above 5 Hz, so
probably something wrong in the calibration. |
|
|
15808
|
Tue Feb 16 13:13:39 2021 |
Yehonathan | Update | BHD | SOS assembly | Gautam pointed out that there are extra
Sm-Co magnets stored in the clean optics
cabinet. |
|
|
15810
|
Tue Feb 16 15:29:01 2021 |
Koji | Update | BHD | SOS assembly | The curie temp of SmCo seems about x2 (in
K) of the one for NdFeB. i.e. 600K vs 1000K.
So I believe 177degC = 450K is not an issue. |
|
|
15811
|
Tue Feb 16 22:59:36 2021 |
Yehonathan | Update | BHD | SOS assembly | Done.
Also, the magnets are nickel-plated.
I guess that doesn't matter for the baking |
|
|
15821
|
Fri Feb 19 12:21:04 2021 |
Yehonathan | Update | BHD | SOS assembly | A summary of things that need to be fabricated/purchased/done:
|
|
|
15901
|
Thu Mar 11 02:10:06 2021 |
Koji | Summary | BHD | BHD Platform vertical dimentions | Stephen and I discussed the nominal heights
of the BHD platform components.
The beam height from the |
|
|
15909
|
Fri Mar 12 03:23:37 2021 |
Koji | Update | BHD | DO card (DO-32L-PE) brought from WB | I've brought 4 DO-32L-PE cards from
WB for BHD upgrade for Jon. |
|
|
15922
|
Tue Mar 16 14:37:36 2021 |
Yehonathan | Update | BHD | SOS SmCo magnets Inspection | In the cleanroom, I opened the nickel-plated
SmCo magnet box to take a closer look. I
handled the magnets with tweezers. I wrapped |
|
|
15931
|
Wed Mar 17 14:40:39 2021 |
Yehonathan | Update | BHD | SOS SmCo magnets Inspection | Continuing with envelope number 2
Magnet |
|
|
15964
|
Thu Mar 25 14:58:16 2021 |
Yehonathan | Update | BHD | SOS SmCo magnets Inspection | Redoing magnet measurement of envelope
1:
|
|
|
15969
|
Fri Mar 26 10:25:37 2021 |
Yehonathan | Update | BHD | SOS assembly | I measure some of the dowel pins we got
from Mcmaster with a caliper.
One small pin is 0.093" in |
|
|
15999
|
Tue Apr 6 15:42:57 2021 |
Yehonathan | Update | BHD | SOS assembly | We got some dumbells from Re-Source Manufacturing
(see attached). I picked 3 in random and
measured their dimensions: |
|
|
16011
|
Fri Apr 9 20:54:54 2021 |
Yehonathan | Update | BHD | SOS assembly | Today I assembled the skeleton of 6 towers,
without clamps and sensor assembly (attachment
1). |
|
|
16018
|
Mon Apr 12 17:30:11 2021 |
Yehonathan | Update | BHD | SOS assembly | Today, I screwed the plungers on the sensor
plates and installed them on the Towers.
I also installed the wire clamps on the suspension |
|
|
16111
|
Mon May 3 16:49:04 2021 |
Yehonathan | Update | BHD | SOS assembly | I found a "vice" in the cleanroom
(attachment 1). I used it to push dowel pins
into the last suspension block using some |
|
|
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 |
|
|
16170
|
Tue Jun 1 16:17:06 2021 |
Yehonathan | Update | BHD | SOS assembly | I tried to push the clean Viton tips into
the vented screws just to find out that the
vented holes are too small. We need to drill |
|
|
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. |
|
|
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 |
|
|
16215
|
Fri Jun 18 19:02:00 2021 |
Yehonathan | Update | BHD | SOS assembly | Today I glued some magnets to dumbells.
First, I took 6 magnets (the maximum
I can glue in one go) and divided them into |
|
|
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 |
|
|
16221
|
Tue Jun 22 17:05:26 2021 |
Yehonathan | Update | BHD | SOS assembly | According to the schematics,
the distance between the original EQ tap
holes is 0.5". Given that the original |
|
|
16227
|
Mon Jun 28 12:35:19 2021 |
Yehonathan | Update | BHD | SOS assembly | On Thursday, I glued another set of 6 dumbells+magnets
using the same method as before. I made sure
that dumbells are pressed onto the magnets. |
|
|
16229
|
Tue Jun 29 20:45:52 2021 |
Yehonathan | Update | BHD | SOS assembly | I glued another batch of 6 magnet+dumbell
assemblies. I will take a look at them under
the microscope once they are cured. |
|
|
16235
|
Thu Jul 1 16:45:25 2021 |
Yehonathan | Update | BHD | SOS assembly | The bonding test passed - the weight still
hangs from the dumbell. Unfortunately, I
broke the bond trying to release the assembly |
|
|
16259
|
Tue Jul 27 17:14:18 2021 |
Yehonathan | Update | BHD | SOS assembly | Jordan has made 1/4" tap holes in
the lower EQ stop holders (attachment). The
1/4" stops (schematics) |
|
|
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. |
|
|
16262
|
Wed Jul 28 12:00:35 2021 |
Yehonathan | Update | BHD | SOS assembly | After receiving two new tubes of EP-30
I resumed the gluing activities. I made a
spreadsheet |
|