Subject: Problem raith SNF 2005-02-08 09:39:24: Reports of increased scattering or leakage when blanked
From: jwc@snf.stanford.edu
Date: Tue, 8 Feb 2005 09:39:24 -0800

Greetings:
Yesterday with Dirk Englund we observed an increase in the scattering from the Raith
blanker on the RAITH 150 EBL system.
Parameters:
10 kV, 20 um aperture, beam I Raith blanker 'on' (Beam Off) = 
0.023 nA. Beam I Raith 'off' (Beam ON) = ~ 0.087 nA.
Users are requested to measure their beam Currents both with and without the blanker
'on' and record the values observed in the RAITH users logbook.  Raith USA and I are
working to promptly address this concern.
JWC 02082005 09:39