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Entry  Tue Mar 2 23:11:43 2010, Koji, Update, SUS, ITMX hung 
    Reply  Wed Mar 3 02:57:29 2010, Jenne, Update, SUS, ITMX hung 
    Reply  Fri Mar 5 11:21:18 2010, steve, Update, SUS, used OSEMs are magnetic 
       Reply  Fri Mar 5 18:04:56 2010, rana, Update, SUS, used OSEMs are magnetic 
Message ID: 2658     Entry time: Fri Mar 5 11:21:18 2010     In reply to: 2651     Reply to this: 2659
Author: steve 
Type: Update 
Category: SUS 
Subject: used OSEMs are magnetic 


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.

 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.

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