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40m Log |
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Tue Mar 2 23:11:43 2010, Koji, Update, SUS, ITMX hung
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Wed Mar 3 02:57:29 2010, Jenne, Update, SUS, ITMX hung
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Fri Mar 5 11:21:18 2010, steve, Update, SUS, used OSEMs are magnetic
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Fri Mar 5 18:04:56 2010, rana, Update, SUS, used OSEMs are magnetic
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Message ID: 2658
Entry time: Fri Mar 5 11:21:18 2010
In reply to: 2651
Reply to this: 2659
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Author: |
steve |
Type: |
Update |
Category: |
SUS |
Subject: |
used OSEMs are magnetic |
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Quote: |
Jenne and Koji
We successfully hung ITMX on the SOS. Side magnet is ~2mm off from the center of the OSEM. ITMX aligned using the QPD. The OSEMs changes the alignment. It looks that something magnetic is inside the OSEM PD or LED.
Reguled ITMY side magnet.
Cleaned up the lab for the safety inspection.
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The brand new OSEM LED and PD can be picked up with a weak magnet. These ferrous metals of LEDs and PDs will be magnetized by sitting in the sus next to the
magnets for years. I hanged optics with new OSEMs and never saw this effect before.
We have to demagnetize them. |