|
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 Sep 26 17:09:15 2012, Den, Update, SUS, TT
|
 Thu Sep 27 15:21:04 2012, Steve, Update, SUS, TT height adaptor & PTICH damping 
| |
Fri Oct 12 10:39:45 2012, Steve, Update, SUS, TT PITCH damping
| |
Fri Oct 12 14:01:33 2012, Koji, Update, SUS, TT PITCH damping
| |
Fri Oct 12 16:59:26 2012, steve, Update, SUS, TT PITCH damping
| |
Wed Oct 17 08:30:49 2012, Steve, Update, SUS, PTICH damping needed
| |
Wed Oct 17 11:15:05 2012, Den, Update, SUS, PITCH damping needed
| |
Thu Oct 18 02:42:38 2012, Den, Update, SUS, PITCH damping needed 7x
| |
Fri Oct 19 18:30:07 2012, Den, Update, SUS, PITCH damping needed
| |
Sat Oct 20 01:23:56 2012, Den, Update, SUS, PITCH damping needed
| |
Sat Oct 20 20:37:55 2012, Den, Update, SUS, PITCH damping needed
| |
Mon Oct 22 11:26:12 2012, rana, Update, SUS, PITCH damping needed
| |
Tue Oct 23 01:46:53 2012, Den, Update, SUS, PITCH damping needed
| |
Tue Oct 23 17:12:30 2012, Den, Update, SUS, PITCH damping needed
| |
Wed Oct 24 01:02:10 2012, Koji, Update, SUS, PITCH damping needed
| |
Mon Oct 29 18:14:55 2012, Den, Update, SUS, PITCH damping needed
| |
Tue Oct 23 18:18:29 2012, Jenne, Update, SUS, PITCH damping needed
|
|
|
Message ID: 7585
Entry time: Sat Oct 20 01:23:56 2012
In reply to: 7583
Reply to this: 7586
7588
|
| Author: |
Den |
| Type: |
Update |
| Category: |
SUS |
| Subject: |
PITCH damping needed |
|
|
| Quote: |
|
Measurements confirm that damping using small actuation magnets reduces pitch Q by a factor of 4 and is not enough.
|
I've tested the idea to use coils as eddy current dampers. I terminated them with a wire and measured Q factor during the ringdown test. Sadly, I did not see any significant damping and Q was ~150. We need stronger magnets if we want eddy current dumping down to Q~1.
  
|